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Description of problem:
The customer complains docker has been removed without prior warnings.
Currently it is (lightly) documented.

From my understanding, some steps to migrate to podman have to be done prior to the upgrade, so a warning (with possibly a KB link) could be welcome.


Version-Release number of selected component (if applicable):
Latest

How reproducible:
100%

Steps to Reproduce:
1. Install a fresh RHEL 7.8 with docker
2. Proceed to the upgrade

Actual results:
docker is removed without warnings


Expected results:
a warning is welcome.

Created attachment 1701728 [details]
Leapp report after pre-upgrade

Tested leapp upgrade with docker

[root@rhel7u6-1 files]# rpm -q docker
docker-1.13.1-162.git64e9980.el7_8.x86_64

[root@rhel7u6-1 files]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
   Active: active (running) since Mon 2020-07-20 05:38:37 EDT; 5min ago
     Docs: http://docs.docker.com
 Main PID: 10675 (dockerd-current)

There was no error or warning while doing leapp pre-upgrade

[root@rhel7u6-1 files]# cat /var/log/leapp/leapp-report.txt|grep -i docker
[root@rhel7u6-1 files]#

Attaching leapp report

After the discussion with Pavel Odvody, we will inhibit the in-place upgrade in case the docker is installed on the system. In short, it will be required to remove the docker rpm prior the upgrade if installed.

Updated the Upgrading from RHEL 7 to RHEL 8 guide (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/upgrading_from_rhel_7_to_rhel_8/preparing-a-rhel-7-system-for-the-upgrade_upgrading-from-rhel-7-to-rhel-8) to add guidance about Docker not being supported in RHEL 8. Closing ticket.

This has been covered already in the current release. Closing