Only upstream Docker has 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 Docker on CentOS, 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 CentOS and Rancher that has 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.