Tag Archives: oracle Linux upgrade

ol6 to ol7 upgrade post

How to upgrade from Oracle Linux 6 to Oracle Linux 7

In this quick walk-through we will upgrade OL 6.8 to OL 7.6

OL6 to OL7!

All outputs under this article are from the EC2 server running on AWS. I am using Oracle Linux Yum server public repo hence reference the names from it. If your system is registered to ULN then use respective repos accordingly.

First you need to prepare system for upgrade. Below are pre-requisites :

  • Make sure you have a proper backup of your data, disabled monitoring of server, stopped all applications on the server, etc.
  • Make sure the system is subscribed to ol6_latest repository
  • Update system completely using yum update
  • Subscribe system to ol6_addons repo
  • Make sure the system meets all OL7 system requirements.

Once you are ready you can go ahead with running pre-upgrade checks to verify if your system is compatible to move on. For that, you need to install the below packages. Those are available from ol6_addons repo.

[root@kerneltalks ~]# yum install openscap redhat-upgrade-tool preupgrade-assistant  preupgrade-assistant-el6toel7 preupgrade-assistant-el6toel7-data-0 preupgrade-assistant-tools preupgrade-assistant-ui

Once packages are installed you are ready to run a pre-upgrade check. Note: In my case, preupgrade-assistant-el6toel7-data-0 was not available from my repo but it did not hurt my upgrade.

Now run below command to run checks –

[root@kerneltalks ~]# preupg
The Preupgrade Assistant is a diagnostics tool
and does not perform the actual upgrade.
Do you want to continue? [Y/n]
Y
Gathering logs used by the Preupgrade Assistant:
All installed packages                                 : 01/10 ...finished (time 00:00s)
All changed files                                      : 02/10 ...finished (time 01:39s)
Changed config files                                   : 03/10 ...finished (time 00:00s)
All users                                              : 04/10 ...finished (time 00:00s)
All groups                                             : 05/10 ...finished (time 00:00s)
Service statuses                                       : 06/10 ...finished (time 00:00s)
All installed files                                    : 07/10 ...finished (time 00:00s)
All local files                                        : 08/10 ...finished (time 00:01s)
All executable files                                   : 09/10 ...finished (time 00:00s)
Oracle signed packages                                 : 10/10 ...finished (time 00:00s)
Assessment of the system, running checks / SCE scripts:
001/141 ...done    (Configuration files to be reviewed) (time: 00:01s)
002/141 ...done    (File lists for the manual migration) (time: 00:00s)
003/141 ...done    (Bacula Backup Software) (time: 00:00s)
004/141 ...done    (MySQL configuration) (time: 00:00s)
005/141 ...done    (MySQL data stack) (time: 00:00s)
006/141 ...done    (Changes related to moving from MySQL to MariaDB) (time: 00:00s)
007/141 ...done    (PostgreSQL) (time: 00:00s)
008/141 ...done    (GNOME desktop environment) (time: 00:00s)
009/141 ...done    (KDE desktop environment) (time: 00:00s)
010/141 ...done    (POWER6 processors) (time: 00:00s)
011/141 ...done    (Graphic drivers not supported in Oracle Linux 7) (time: 00:00s)
012/141 ...done    (Input drivers not supported in Oracle Linux 7) (time: 00:00s)
013/141 ...done    (Kernel networking drivers not available in Oracle Linux 7) (time: 00:00s)
014/141 ...done    (Kernel storage drivers not available in Oracle Linux 7) (time: 00:00s)
015/141 ...done    (Oracle Directory Server) (time: 00:00s)
016/141 ...done    (Arptables) (time: 00:00s)
017/141 ...done    (BIND9 in a chroot environment) (time: 00:00s)
018/141 ...done    (BIND9 configuration compatibility) (time: 00:00s)
019/141 ...done    (Moving the 'dhcpd' and 'dhcrelay' arguments) (time: 00:00s)
020/141 ...done    (Dnsmasq) (time: 00:00s)
021/141 ...done    (Dovecot) (time: 00:00s)
022/141 ...done    (Compatibility between iptables and ip6tables) (time: 00:00s)
023/141 ...done    (Net-SNMP) (time: 00:00s)
024/141 ...done    (NFSv2) (time: 00:00s)
025/141 ...done    (OpenLDAP server daemon configuration) (time: 00:00s)
026/141 ...done    (Moving openssh-keycat) (time: 00:00s)
027/141 ...done    (SSH configuration file and SSH keys) (time: 00:00s)
028/141 ...done    (Postfix) (time: 00:00s)
029/141 ...done    (SMB) (time: 00:00s)
030/141 ...done    (Sendmail) (time: 00:00s)
031/141 ...done    (Squid) (time: 00:00s)
032/141 ...done    (VSFTP daemon configuration) (time: 00:00s)
033/141 ...done    (Reusable configuration files) (time: 00:00s)
034/141 ...done    (Changed configuration files) (time: 00:00s)
035/141 ...done    (Rsyslog configuration incompatibility) (time: 00:00s)
036/141 ...done    (VCS repositories) (time: 00:00s)
037/141 ...done    (Added and extended options for BIND9) (time: 00:00s)
038/141 ...done    (Added options in dnsmasq) (time: 00:00s)
039/141 ...done    (Changes in utilities) (time: 00:00s)
040/141 ...done    (Packages from other system variants) (time: 00:00s)
041/141 ...done    (Load balancer support) (time: 00:00s)
042/141 ...done    (Packages not signed by Oracle) (time: 00:00s)
043/141 ...done    (Obsolete RPM packages) (time: 00:01s)
044/141 ...done    (w3m browser) (time: 00:00s)
045/141 ...done    (The qemu-guest-agent package) (time: 00:00s)
046/141 ...done    (The coreutils packages) (time: 00:00s)
047/141 ...done    (The gawk package) (time: 00:00s)
048/141 ...done    (Removed command line options) (time: 00:00s)
049/141 ...done    (The netstat binary) (time: 00:00s)
050/141 ...done    (Quota) (time: 00:00s)
051/141 ...done    (The util-linux (util-linux-ng) binaries) (time: 00:00s)
052/141 ...done    (Removed RPM packages) (time: 00:01s)
053/141 ...done    (TaskJuggler) (time: 00:00s)
054/141 ...done    (Replaced RPM packages) (time: 00:02s)
055/141 ...done    (GMP library incompatibilities) (time: 00:00s)
056/141 ...done    ("not-base" channels) (time: 00:05s)
057/141 ...done    (Package downgrades) (time: 00:00s)
058/141 ...done    (Custom SELinux policy) (time: 00:00s)
059/141 ...done    (Custom SELinux configuration) (time: 00:03s)
060/141 ...done    (Samba SELinux context check) (time: 00:00s)
061/141 ...done    (Removing sandbox from SELinux) (time: 00:00s)
062/141 ...done    (CUPS Browsing and BrowsePoll) (time: 00:00s)
063/141 ...done    (CVS) (time: 00:00s)
064/141 ...done    (FreeRADIUS) (time: 00:00s)
065/141 ...done    (httpd) (time: 00:00s)
066/141 ...done    (The bind-dyndb-ldap configuration file) (time: 00:00s)
067/141 ...done    (Identity Management Server) (time: 00:00s)
068/141 ...done    (IPA Server CA) (time: 00:00s)
069/141 ...done    (Network Time Protocol) (time: 00:00s)
070/141 ...done    (time-sync.target) (time: 00:00s)
071/141 ...done    (OpenLDAP /etc/sysconfig and data compatibility) (time: 00:00s)
072/141 ...done    (The OpenSSH sshd_config file migration) (time: 00:00s)
073/141 ...done    (The OpenSSH sysconfig/sshd file migration) (time: 00:00s)
074/141 ...done    (The quota_nld service) (time: 00:00s)
075/141 ...done    (Moving the disk quota netlink message daemon into the quota-nld package) (time: 00:00s)
076/141 ...done    (System Security Services Daemon) (time: 00:00s)
077/141 ...done    (Tomcat configuration compatibility check) (time: 00:00s)
078/141 ...done    (Detection of LUKS devices using Whirlpool for password hash) (time: 00:00s)
079/141 ...done    (Detection of Direct Access Storage Device (DASD) format on s390x platform for LDL format) (time: 00:00s)
080/141 ...done    (The clvmd and cmirrord daemon management) (time: 00:00s)
081/141 ...done    (Logical Volume Management 2 services) (time: 00:00s)
082/141 ...done    (Device Mapper Multipath) (time: 00:00s)
083/141 ...done    (The scsi-target-utils packages) (time: 00:00s)
084/141 ...done    (Backing up warnquota) (time: 00:00s)
085/141 ...done    (The warnquota tool) (time: 00:00s)
086/141 ...done    (Add-Ons) (time: 00:00s)
087/141 ...done    (Unsupported architectures) (time: 00:00s)
088/141 ...done    (Binaries to be rebuilt) (time: 00:25s)
089/141 ...done    (Debuginfo packages) (time: 00:00s)
090/141 ...done    (Read-only FHS directories) (time: 00:00s)
091/141 ...done    (FHS incompatibilities) (time: 00:00s)
092/141 ...done    (Requirements for the /usr/ directory) (time: 00:00s)
093/141 ...done    (Cluster and High Availability) (time: 00:00s)
094/141 ...done    (The quorum implementation) (time: 00:00s)
095/141 ...done    (The krb5kdc configuration file) (time: 00:00s)
096/141 ...done    (File systems, partitions, and the mounts configuration) (time: 00:00s)
097/141 ...done    (Removable media in the /etc/fstab file) (time: 00:00s)
098/141 ...done    (Libraries with their soname bumped) (time: 00:08s)
099/141 ...done    (Libraries with their soname kept) (time: 00:07s)
100/141 ...done    (Removed .so libraries) (time: 00:46s)
101/141 ...done    (CGROUP_DAEMON in sysconfig scripts) (time: 00:00s)
102/141 ...done    (Checking the system version and variant) (time: 00:00s)
103/141 ...done    (Consequences of upgrading to RHEL 7.6 instead of the latest RHEL minor version) (time: 00:00s)
104/141 ...done    (AIDE) (time: 00:00s)
105/141 ...done    (CA bundles) (time: 00:00s)
106/141 ...done    (Oracle Developer Toolset) (time: 00:00s)
107/141 ...done    (GRUB to GRUB 2 migration) (time: 00:00s)
108/141 ...done    (Grubby) (time: 00:00s)
109/141 ...done    (Obsoleting Hardware Abstraction Layer) (time: 00:00s)
110/141 ...done    (Hyper-V) (time: 00:00s)
111/141 ...done    (Enabled and disabled services in Oracle Linux 6) (time: 00:02s)
112/141 ...done    (Ethernet interface naming) (time: 00:00s)
113/141 ...done    (The /etc/rc.local and /etc/rc.d/rc.local files) (time: 00:00s)
114/141 ...done    (java-1.8.0-ibm compatibility check) (time: 00:00s)
115/141 ...done    (Java upgrade) (time: 00:00s)
116/141 ...done    (The kernel-kdump package) (time: 00:00s)
117/141 ...done    (The cgroups configuration compatibility) (time: 00:00s)
118/141 ...done    (Pluggable authentication modules (PAM)) (time: 00:00s)
119/141 ...done    (Perl modules not distributed by Oracle) (time: 00:13s)
120/141 ...done    (PHP modules not distributed by Oracle) (time: 00:00s)
121/141 ...done    (PolicyKit) (time: 00:00s)
122/141 ...done    (Python packages) (time: 00:03s)
123/141 ...done    (Repositories for Kickstart) (time: 00:00s)
124/141 ...done    (System requirements) (time: 00:00s)
125/141 ...done    (Ruby 2.0.0) (time: 00:00s)
126/141 ...done    (Oracle Software Collections (RHSCL)) (time: 00:00s)
127/141 ...done    (Oracle Subscription Manager) (time: 00:00s)
128/141 ...done    (Oracle Network Classic unsupported) (time: 00:00s)
129/141 ...done    (Copying Kickstart) (time: 00:00s)
130/141 ...done    (The 'tuned' profiles) (time: 00:00s)
131/141 ...done    (UEFI boot loader) (time: 00:00s)
132/141 ...done    (Yaboot) (time: 00:00s)
133/141 ...done    (The yum configuration file) (time: 00:00s)
134/141 ...done    (Dangerous ranges of UIDs and GIDs) (time: 00:00s)
135/141 ...done    (Incorrect usage of reserved UIDs and GIDs) (time: 00:01s)
136/141 ...done    (The libuser.conf file) (time: 00:00s)
137/141 ...done    (NIS ypbind) (time: 00:00s)
138/141 ...done    (NIS Makefile) (time: 00:00s)
139/141 ...done    (NIS server maps) (time: 00:00s)
140/141 ...done    (NIS server UID_MIN and GID_MIN limits) (time: 00:00s)
141/141 ...done    (The NIS server configuration file) (time: 00:00s)
The assessment finished (time 02:18s)
The '/root/preupgrade/cleanconf/etc/ssh/sshd_config' configuration file already exists in the '/root/preupgrade/cleanconf/etc/ssh' directory
The 'https://z5.kerneltalks.com/root/preupgrade/cleanconf/etc/yum.conf' configuration file already exists in the '/root/preupgrade/cleanconf/etc' directory
Result table with checks and their results for 'main contents':
-------------------------------------------------------------------------------------------------------------------
|Bacula Backup Software                                                                        |notapplicable     |
|MySQL configuration                                                                           |notapplicable     |
|MySQL data stack                                                                              |notapplicable     |
|Changes related to moving from MySQL to MariaDB                                               |notapplicable     |
|PostgreSQL                                                                                    |notapplicable     |
|GNOME desktop environment                                                                     |notapplicable     |
|KDE desktop environment                                                                       |notapplicable     |
|Graphic drivers not supported in Oracle Linux 7                                               |notapplicable     |
|Input drivers not supported in Oracle Linux 7                                                 |notapplicable     |
|Oracle Directory Server                                                                       |notapplicable     |
|Arptables                                                                                     |notapplicable     |
|BIND9 in a chroot environment                                                                 |notapplicable     |
|BIND9 configuration compatibility                                                             |notapplicable     |
|Moving the 'dhcpd' and 'dhcrelay' arguments                                                   |notapplicable     |
|Dnsmasq                                                                                       |notapplicable     |
|Dovecot                                                                                       |notapplicable     |
|Net-SNMP                                                                                      |notapplicable     |
|OpenLDAP server daemon configuration                                                          |notapplicable     |
|Postfix                                                                                       |notapplicable     |
|SMB                                                                                           |notapplicable     |
|Squid                                                                                         |notapplicable     |
|VSFTP daemon configuration                                                                    |notapplicable     |
|Added and extended options for BIND9                                                          |notapplicable     |
|Added options in dnsmasq                                                                      |notapplicable     |
|Load balancer support                                                                         |notapplicable     |
|w3m browser                                                                                   |notapplicable     |
|The qemu-guest-agent package                                                                  |notapplicable     |
|Quota                                                                                         |notapplicable     |
|TaskJuggler                                                                                   |notapplicable     |
|Samba SELinux context check                                                                   |notapplicable     |
|CUPS Browsing and BrowsePoll                                                                  |notapplicable     |
|CVS                                                                                           |notapplicable     |
|FreeRADIUS                                                                                    |notapplicable     |
|The bind-dyndb-ldap configuration file                                                        |notapplicable     |
|Identity Management Server                                                                    |notapplicable     |
|IPA Server CA                                                                                 |notapplicable     |
|OpenLDAP /etc/sysconfig and data compatibility                                                |notapplicable     |
|The quota_nld service                                                                         |notapplicable     |
|Moving the disk quota netlink message daemon into the quota-nld package                       |notapplicable     |
|System Security Services Daemon                                                               |notapplicable     |
|Tomcat configuration compatibility check                                                      |notapplicable     |
|Detection of LUKS devices using Whirlpool for password hash                                   |notapplicable     |
|Detection of Direct Access Storage Device (DASD) format on s390x platform for LDL format      |notapplicable     |
|The clvmd and cmirrord daemon management                                                      |notapplicable     |
|Logical Volume Management 2 services                                                          |notapplicable     |
|Device Mapper Multipath                                                                       |notapplicable     |
|The scsi-target-utils packages                                                                |notapplicable     |
|Backing up warnquota                                                                          |notapplicable     |
|The warnquota tool                                                                            |notapplicable     |
|The quorum implementation                                                                     |notapplicable     |
|The krb5kdc configuration file                                                                |notapplicable     |
|AIDE                                                                                          |notapplicable     |
|Obsoleting Hardware Abstraction Layer                                                         |notapplicable     |
|Java upgrade                                                                                  |notapplicable     |
|java-1.8.0-ibm compatibility check                                                            |notapplicable     |
|The kernel-kdump package                                                                      |notapplicable     |
|PHP modules not distributed by Oracle                                                         |notapplicable     |
|Ruby 2.0.0                                                                                    |notapplicable     |
|Oracle Software Collections (RHSCL)                                                           |notapplicable     |
|Oracle Network Classic unsupported                                                            |notapplicable     |
|Oracle Subscription Manager                                                                   |notapplicable     |
|Copying Kickstart                                                                             |notapplicable     |
|The 'tuned' profiles                                                                          |notapplicable     |
|Yaboot                                                                                        |notapplicable     |
|NIS ypbind                                                                                    |notapplicable     |
|NIS Makefile                                                                                  |notapplicable     |
|NIS server maps                                                                               |notapplicable     |
|NIS server UID_MIN and GID_MIN limits                                                         |notapplicable     |
|The NIS server configuration file                                                             |notapplicable     |
|POWER6 processors                                                                             |pass              |
|Kernel networking drivers not available in Oracle Linux 7                                     |pass              |
|Kernel storage drivers not available in Oracle Linux 7                                        |pass              |
|Sendmail                                                                                      |pass              |
|Reusable configuration files                                                                  |pass              |
|time-sync.target                                                                              |pass              |
|The OpenSSH sshd_config file migration                                                        |pass              |
|Add-Ons                                                                                       |pass              |
|Unsupported architectures                                                                     |pass              |
|Debuginfo packages                                                                            |pass              |
|Read-only FHS directories                                                                     |pass              |
|Requirements for the /usr/ directory                                                          |pass              |
|Cluster and High Availability                                                                 |pass              |
|CGROUP_DAEMON in sysconfig scripts                                                            |pass              |
|Checking the system version and variant                                                       |pass              |
|CA bundles                                                                                    |pass              |
|Oracle Developer Toolset                                                                      |pass              |
|Hyper-V                                                                                       |pass              |
|The /etc/rc.local and /etc/rc.d/rc.local files                                                |pass              |
|Pluggable authentication modules (PAM)                                                        |pass              |
|Python packages                                                                               |pass              |
|System requirements                                                                           |pass              |
|The libuser.conf file                                                                         |pass              |
|NFSv2                                                                                         |informational     |
|Rsyslog configuration incompatibility                                                         |informational     |
|VCS repositories                                                                              |informational     |
|The coreutils packages                                                                        |informational     |
|The gawk package                                                                              |informational     |
|Removed command line options                                                                  |informational     |
|The netstat binary                                                                            |informational     |
|The util-linux (util-linux-ng) binaries                                                       |informational     |
|GMP library incompatibilities                                                                 |informational     |
|httpd                                                                                         |informational     |
|Network Time Protocol                                                                         |informational     |
|File systems, partitions, and the mounts configuration                                        |informational     |
|Removable media in the /etc/fstab file                                                        |informational     |
|Libraries with their soname kept                                                              |informational     |
|Consequences of upgrading to RHEL 7.6 instead of the latest RHEL minor version                |informational     |
|Perl modules not distributed by Oracle                                                        |informational     |
|PolicyKit                                                                                     |informational     |
|The yum configuration file                                                                    |informational     |
|SSH configuration file and SSH keys                                                           |fixed             |
|Replaced RPM packages                                                                         |fixed             |
|Package downgrades                                                                            |fixed             |
|Custom SELinux policy                                                                         |fixed             |
|Custom SELinux configuration                                                                  |fixed             |
|The OpenSSH sysconfig/sshd file migration                                                     |fixed             |
|Grubby                                                                                        |fixed             |
|Dangerous ranges of UIDs and GIDs                                                             |fixed             |
|File lists for the manual migration                                                           |needs_inspection  |
|Compatibility between iptables and ip6tables                                                  |needs_inspection  |
|Moving openssh-keycat                                                                         |needs_inspection  |
|Changed configuration files                                                                   |needs_inspection  |
|Changes in utilities                                                                          |needs_inspection  |
|Obsolete RPM packages                                                                         |needs_inspection  |
|Binaries to be rebuilt                                                                        |needs_inspection  |
|FHS incompatibilities                                                                         |needs_inspection  |
|Libraries with their soname bumped                                                            |needs_inspection  |
|Removed .so libraries                                                                         |needs_inspection  |
|Ethernet interface naming                                                                     |needs_inspection  |
|Repositories for Kickstart                                                                    |needs_inspection  |
|Incorrect usage of reserved UIDs and GIDs                                                     |needs_inspection  |
|Configuration files to be reviewed                                                            |needs_action      |
|Packages from other system variants                                                           |needs_action      |
|Packages not signed by Oracle                                                                 |needs_action      |
|Removed RPM packages                                                                          |needs_action      |
|"not-base" channels                                                                           |needs_action      |
|Removing sandbox from SELinux                                                                 |needs_action      |
|GRUB to GRUB 2 migration                                                                      |needs_action      |
|Enabled and disabled services in Oracle Linux 6                                               |needs_action      |
|The cgroups configuration compatibility                                                       |needs_action      |
|UEFI boot loader                                                                              |needs_action      |
-------------------------------------------------------------------------------------------------------------------
The tarball with results is stored in 'https://z5.kerneltalks.com/root/preupgrade-results/preupg_results-200723042538.tar.gz' .
The latest assessment is stored in the '/root/preupgrade' directory.
Summary information:
We have found some potential risks.
Read the full report file '/root/preupgrade/result.html' for more details.
Please ensure you have backed up your system and/or data
before doing a system upgrade to prevent loss of data in
case the upgrade fails and full re-install of the system
from installation media is needed.
Upload results to UI by the command:
e.g. preupg -u http://example.com:8099/submit/ -r /root/preupgrade-results/preupg_results-200723042538.tar.gz .

Once the tool completes checks, download, and review /root/preupgrade/result.html It will be something like below –

Pre-upgrade report

It will be having all the checks, their results, what is actionable and what actions to be taken.

Spare some time to read the report thoroughly, read the actionable, action on it if it suits your environment/needs, etc. and then move ahead with the upgrade. Since I am running a test instance on AWS, I did not care to consider actionable and I moved ahead with the upgrade.

The upgrade needs an ISO or network path from where it can read OL7 packages for an upgrade. I downloaded OL7 ISO from Oracle using get. To start upgrade with ISO use below command –

[root@kerneltalks ~]# redhat-upgrade-tool-cli --iso OracleLinux-R7-U6-Server-x86_64-dvd.iso --debuglog=/tmp/upgrade.log --cleanup-post
setting up repos...
upgradeiso                                                                                                                                       | 3.6 kB     00:00 ...
upgradeiso/primary_db                                                                                                                            | 5.0 MB     00:00 ...
The Preupgrade Assistant has found upgrade risks.
 You can run 'preupg --riskcheck --verbose' to view these risks.
Addressing high risk issues is mandatory before continuing with the upgrade.
Ignoring these risks may result in a broken and/or unsupported upgrade.
Please backup your data.

List of issues:
preupg.risk.MEDIUM: Some packages installed on the system were removed between Oracle Linux 6 and Oracle Linux 7. This might break the functionality of the packages that depend on the removed packages.
preupg.risk.MEDIUM: After the upgrade, migrate GRUB to GRUB 2 manually.
preupg.risk.MEDIUM: The  name distros was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name __init__.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name __init__.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name __init__.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name arch.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name arch.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name arch.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name debian.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name debian.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name debian.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name fedora.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name fedora.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name fedora.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name freebsd.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name freebsd.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name freebsd.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name gentoo.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name gentoo.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name gentoo.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name net_util.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name net_util.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name net_util.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name parsers was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hostname.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hostname.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hostname.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hosts.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hosts.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name hosts.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name resolv_conf.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name resolv_conf.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name resolv_conf.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sys_conf.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sys_conf.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sys_conf.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel_util.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel_util.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name rhel_util.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sles.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sles.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name sles.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name ubuntu.py was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name ubuntu.pyc was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.MEDIUM: The  name ubuntu.pyo was changed in Oracle Linux 7 to one of these services:  cloud-config.service cloud-config.target cloud-final.service cloud-init-local.service cloud-init.service
preupg.risk.SLIGHT: We detected some files where their modifications are not tracked by the RPM packages. Check the functionality of the files after the successful upgrade.
preupg.risk.HIGH: The /etc/shadow and /etc/gshadow files must be backed up manually by the administrator.
preupg.risk.HIGH: You have installed some packages signed by Oracle for a different variant of the Oracle Linux system.
preupg.risk.HIGH: We detected some packages not signed by Oracle. You can find the list in the /root/preupgrade/kickstart/nonrhpkgs file. Handle them yourself.
preupg.risk.HIGH: After upgrading to Oracle Linux 7, there are still some el6 packages left. Add the '--cleanup-post' option to redhat-upgrade-tool to remove them automatically.
preupg.risk.HIGH: The apr-util-ldap package moved to the Optional channel between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.HIGH: The groff package moved to the Optional channel between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.HIGH: The openscap-engine-sce package is available in the Optional channel.
preupg.risk.HIGH: The python-pygments package moved to the Optional channel between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.HIGH: The system-config-firewall-tui package moved to the Optional channel between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.HIGH: The xz-lzma-compat package moved to the Optional channel between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.HIGH: There were changes in SELinux policies between Oracle Linux 6 and Oracle Linux 7. See the solution to resolve this problem.
preupg.risk.HIGH: Back up the grub RPM manually before the upgrade. See the remediation instructions for more info.
preupg.risk.HIGH: The blk-availability service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable blk-availability && systemctl start blk-availability.service .
preupg.risk.HIGH: The cloud-config service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable cloud-config && systemctl start cloud-config.service .
preupg.risk.HIGH: The cloud-final service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable cloud-final && systemctl start cloud-final.service .
preupg.risk.HIGH: The cloud-init service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable cloud-init && systemctl start cloud-init.service .
preupg.risk.HIGH: The cloud-init-hotplugd service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable cloud-init-hotplugd && systemctl start cloud-init-hotplugd.service .
preupg.risk.HIGH: The cloud-init-local service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable cloud-init-local && systemctl start cloud-init-local.service .
preupg.risk.HIGH: The ip6tables service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable ip6tables && systemctl start ip6tables.service .
preupg.risk.HIGH: The messagebus service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable messagebus && systemctl start messagebus.service .
preupg.risk.HIGH: The netfs service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable netfs && systemctl start netfs.service .
preupg.risk.HIGH: The network service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable network && systemctl start network.service .
preupg.risk.HIGH: The ntpd service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable ntpd && systemctl start ntpd.service .
preupg.risk.HIGH: The sendmail service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable sendmail && systemctl start sendmail.service .
preupg.risk.HIGH: The udev-post service is disabled by default in Oracle Linux 7. Enable it by typing: systemctl enable udev-post && systemctl start udev-post.service .
preupg.risk.HIGH: Additional libcgroup configuration files were created (https://z5.kerneltalks.com/etc/cgconfig.d).
preupg.risk.HIGH: Binary efibootmgr is not installed.
preupg.risk.HIGH: Please, install all required packages (and binaries) and run preupg again to process check properly.
preupg.risk.MEDIUM: The ssh-keycat files are moved to the openssh-keycat package.
preupg.risk.MEDIUM: Some packages installed on the system were removed between Oracle Linux 6 and Oracle Linux 7. This might break the functionality of the packages depending on these removed packages.
preupg.risk.MEDIUM: Conflict with the file structure: the /run/ directory already exists.
preupg.risk.MEDIUM:  Some soname bumps in the libraries installed on the system were detected, which might break the functionality of some of your third-party applications. They might need to be rebuilt, so check their requirements.
preupg.risk.MEDIUM: Some .so libraries installed on the system were removed between Oracle Linux 6 and Oracle Linux 7. This might break the functionality of some of your third-party applications.
preupg.risk.MEDIUM: Reserved user and group IDs by the setup package changed between Oracle Linux 6 and Oracle Linux 7.
preupg.risk.SLIGHT: Some files untracked by RPM packages were detected. Some of these files might need a manual check or migration after redhat-upgrade-tool and/or might cause conflicts during the installation. Try to reduce the number of the unnecessary untracked files before running redhat-upgrade-tool.
preupg.risk.SLIGHT: The iptables or ip6tables service is enabled.Read the remediation instructions.
preupg.risk.SLIGHT: Certain configuration files are changed and the .rpmnew files will be generated.
preupg.risk.SLIGHT: Some utilities were replaced, removed, moved between packages, or their location changed.
preupg.risk.SLIGHT: Some scripts untracked by RPM were discovered on the system. The scripts might not work properly after the upgrade.
preupg.risk.SLIGHT: /etc/sysconfig/network-scripts/ifcfg-eth0 is old style ethX name without HWADDR, its name can change after the upgrade.
preupg.risk.SLIGHT: You use one network device with an old style 'ethX' name.
preupg.risk.SLIGHT: The public_ol6_latest repository is enabled.
preupg.risk.SLIGHT: The public_ol6_addons repository is enabled.
preupg.risk.SLIGHT: The public_ol6_ga_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u1_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u2_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u3_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u4_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u5_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u6_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u7_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_u8_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_UEK_latest repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_UEKR3_latest repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_UEKR4 repository is enabled.
preupg.risk.SLIGHT: The public_ol6_UEK_base repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_MySQL repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_gdm_multiseat repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_MySQL56 repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_MySQL57 repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_ceph10 repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk20_server repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk20_client repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_ofed_UEK repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_UEKR4_OFED repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_playground_latest repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk22_server repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk22_client repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_software_collections repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk24_server repository is not enabled.
preupg.risk.SLIGHT: The public_ol6_spacewalk24_client repository is not enabled.
preupg.risk.SLIGHT: Enabled repository files for the Kickstart generation are stored in the /root/preupgrade/kickstart/available-repos file.
preupg.risk.SLIGHT: Some packages installed on the system changed their names between Oracle Linux 6 and Oracle Linux 7. Although they should be compatible, monitor them after the update.
Continue with the upgrade [Y/N]? Y

Once again it will list out risks of upgrade and ask your confirmation to move ahead. Once you confirm it with Y, the upgrade starts.

Continue with the upgrade [Y/N]? Y
getting boot images...
vmlinuz-redhat-upgrade-tool                                                                                                                      | 6.3 MB     00:00 ...
initramfs-redhat-upgrade-tool.img                                                                                                                |  58 MB     00:00 ...
setting up update...
finding updates 100% [=================================================================================================================================================]testing upgrade transaction
rpm transaction 100% [=================================================================================================================================================]
rpm install 100% [=====================================================================================================================================================]
setting up system for upgrade
HOOK-pkgdowngrades: INFO: start with arguments: /root/preupgrade/pkgdowngrades/enforce_downgraded --destdir=/root/preupgrade/pkgdowngrades/rpms --installroot=/root/preupgrade/pkgdowngrades/installroot --rhelupdir=/var/lib/system-upgrade
No plugin match for: rhnplugin
Repository 'public_ol6_UEK_latest': Error parsing config: Error parsing "enabled = '$uek'": invalid boolean value
Repository 'public_ol6_UEKR3_latest': Error parsing config: Error parsing "enabled = '$uekr3'": invalid boolean value
Repository 'public_ol6_UEKR4': Error parsing config: Error parsing "enabled = '$uekr4'": invalid boolean value
HOOK-pkgdowngrades: WARNING: The ncurses-base.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: WARNING: The 'hwdata' package is not noarch anymore, x86_64 will be installed.
HOOK-pkgdowngrades: WARNING: The 'dracut' package is not noarch anymore, x86_64 will be installed.
HOOK-pkgdowngrades: WARNING: The 'rhn-client-tools' package is not noarch anymore, x86_64 will be installed.
HOOK-pkgdowngrades: WARNING: The 'rhn-check' package is not noarch anymore, x86_64 will be installed.
HOOK-pkgdowngrades: WARNING: The 'rhn-setup' package is not noarch anymore, x86_64 will be installed.
HOOK-pkgdowngrades: WARNING: The perl-Pod-Escapes.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: WARNING: The perl-Module-Pluggable.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: WARNING: The perl-Pod-Simple.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: WARNING: The cloud-utils-growpart.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: WARNING: The python-jinja2.x86_64 package switched to 'noarch' in the next RHEL release.
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libgcc.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'redhat-release-server.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'setup.noarch'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'tzdata.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'ncurses-base.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'filesystem.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'basesystem.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'bash.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss-softokn-freebl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'glibc-common.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'glibc.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nspr.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss-util.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libsepol.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libstdc++.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'ncurses-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'pcre.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libselinux.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'zlib.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'info.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'xz-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'bzip2-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libcom_err.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libdb.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'sed.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libuuid.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libattr.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libacl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libcap.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'grep.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'elfutils-libelf.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libffi.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'popt.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libcap-ng.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'audit-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'chkconfig.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'readline.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'sqlite.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'gawk.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'diffutils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libgpg-error.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libgcrypt.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss-softokn.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'lua.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'p11-kit.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libxml2.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'xz.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'findutils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'cpio.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libnfnetlink.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libmnl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'lz4.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'expat.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libnetfilter_conntrack.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'iptables.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'iproute.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'setools-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'acl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'tar.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libdb-utils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libss.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'e2fsprogs-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'kmod-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libidn.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libselinux-utils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'ncurses.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'gmp.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libverto.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'dmidecode.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libsmartcols.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'ustr.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libsemanage.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'checkpolicy.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libtasn1.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'p11-kit-trust.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'ca-certificates.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'hardlink.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'qrencode-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libyaml.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'keyutils-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'coreutils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'openssl-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'krb5-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'shadow-utils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libblkid.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libmount.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'glib2.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'shared-mime-info.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'gzip.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'cracklib.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'cracklib-dicts.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'pam.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libpwquality.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'pkgconfig.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'e2fsprogs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libutempter.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'cyrus-sasl-lib.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libssh2.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss-sysinit.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'nss-pem.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'nss-tools.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libcurl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'curl.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'rpm-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'rpm.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'openldap.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libuser.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'binutils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'json-c.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'device-mapper.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'kpartx.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'procps-ng.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'util-linux.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'device-mapper-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'cryptsetup-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'dracut.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'kmod.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'elfutils-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'systemd-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'dbus-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'systemd.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'elfutils-default-yama-scope.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'dbus.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libcgroup.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'net-tools.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'policycoreutils.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'gdbm.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-libs.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libselinux-python.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-ipaddress.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-six.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'audit-libs-python.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-markupsafe.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-backports.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-backports-ssl_match_hostname.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-setuptools.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-urllib3.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'PyYAML.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'pyserial.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-IPy.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-babel.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-jinja2.noarch'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'python-prettytable.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-configobj.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'libsemanage-python.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'policycoreutils-python.x86_64'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-jsonpointer.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-jsonpatch.noarch'
HOOK-pkgdowngrades: INFO: DEP: enforcing package installation 'python-chardet.noarch'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'python-requests.noarch'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'cloud-init.x86_64'
HOOK-pkgdowngrades: INFO: DOWNGRADE: enforcing package installation 'vim-minimal.x86_64'
HOOK-pkgdowngrades: INFO: done
Finished. Reboot to start upgrade.
[root@kerneltalks ~]# reboot

Broadcast message from ec2-user@ip-172-31-34-211
        (/dev/pts/0) at 5:41 ...

The system is going down for reboot NOW!

Once command completes it will ask you to reboot the server. Reboot will take a while since upgrade process completes during reboot and then login to system to check.

[root@kerneltalks ~]# cat /etc/*release
Oracle Linux Server release 7.6
NAME="Oracle Linux Server"
VERSION="7.6"
ID="ol"
VARIANT="Server"
VARIANT_ID="server"
VERSION_ID="7.6"
PRETTY_NAME="Oracle Linux Server 7.6"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:7:6:server"
HOME_URL="https://linux.oracle.com/"
BUG_REPORT_URL="https://bugzilla.oracle.com/"

ORACLE_BUGZILLA_PRODUCT="Oracle Linux 7"
ORACLE_BUGZILLA_PRODUCT_VERSION=7.6
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=7.6
Red Hat Enterprise Linux Server release 7.6 (Maipo)
Oracle Linux Server release 7.6

And we are upgraded to Ol7.6! You have to read all the reports and messages before you actually hit confirmation to upgrade. This will make your life easy post upgrade!

Issue with tool version

Redhat upgrade tool always looks for the latest OS that is known to it for an upgrade. So if you are using newer tool version and trying to upgrade OS to old version than the version known to the tool then you will see below error –

The installed version of Preupgrade Assistant allows upgrade only to the system version 7.5

I was trying to upgrade to OL 7.4 and tool was looking for 7.5 only. So in such case, you have to downgrade tool version and try.

For OL 7.4 upgrade below version worked for me –

redhat-upgrade-tool-0.7.50-1.0.1.el6.noarch.rpm

If you use any version below 0.7.50, it will land you up in issue where you see lots of couldn’t add media errors and failed to open file errors in the console –

Warning: couldn't add media/Packages/dracut-network-033-502.0.1.el7.x86_64.rpm to the transaction
Warning: failed to open file /sysroot/var/lib/system-upgrade/media/Packages/xulrunner-31.6.0-2.0.1.el7_1.x86_64.rpm

If you use any version above 0.7.50, you will land in the issue explained above. Decompress kernel modules capability introduced in 0.7.50 makes it best bet in the above-explained scenario.

Few redhat-upgrade-tool versions mapping with their supported upgrades.

redhat-upgrade-tool-0.7.48-1.0.2.el6.noarch.rpmallows upgrade only to the system version 7.5
redhat-upgrade-tool-0.7.49-1.0.2.el6.noarch.rpmallows upgrade only to the system version 7.5
redhat-upgrade-tool-0.7.51-1.0.2.el6.noarch.rpmallows upgrade only to the system version 7.6
redhat-upgrade-tool-0.7.52-1.0.1.el6.noarch.rpmallows upgrade only to the system version 7.6
redhat-upgrade-tool-0.8.0-4.0.1.el6.noarch.rpmallows upgrade only to the system version 7.6