[Rancher] What does Rancher support for Docker on RHEL cover?

Note:

Both, RHEL's own distribution of Docker and upstream Docker (Docker CE) on RHEL, have been validated and certified for Rancher Support.

Rancher support in this scenario will start with issue troubleshooting and RCA (root cause analysis).

Where the root cause has been identified as an issue with RHEL's own distribution of Docker, Rancher will do one of the following, to help Customer resolve the issue:

• Should the issue have been resolved in a later version of RHEL's own distribution of Docker, Rancher will recommend Customer to upgrade to this version, along with the necessary upgrades to versions of RHEL and Rancher that have been certified for this later version RHEL's own distribution of Docker.
• If no fix is available yet for the issue, Rancher will advise the Customer to contact Red Hat directly for issue resolution. Should a new version or patch be provided by Red Hat, Rancher will validate its relevant product versions on the new version or patch and certify it as supported for Customer deployment.

Where the root cause has been identified as an issue with upstream Docker (or Docker CE) on RHEL, Rancher will do one of the following, to help Customer resolve the issue:

• Should the issue have been resolved in a later version of Docker, Rancher will recommend Customer to upgrade to this version, along with the necessary upgrades to versions of RHEL and Rancher that have been certified for this later version of Docker. 
• If no fix is available yet for the issue, however, the situation is critical that an urgent solution is needed, Rancher shall fork Docker with a fix, as possible. Further, Rancher will submit a PR for the fix to Docker for consideration to be accepted into upstream. However, there is no guarantee that the PR will be accepted and merged into upstream Docker.