Cluster controlplane error RHEL7 CentOS7 nodes

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Environment

Situation

Docker version 1.13.1.203 or newer stopped working on downstream cluster RHEL 7.9 nodes,

Docker gets stalled and unresponsive, after setting the newer Kubernetes version in Rancher UI on the downstream cluster for upgrade of Kubernetes to v1.17.4 from v1.16.8 on RHEL 7.9

Error message in Rancher UI:
"Cannot proceed with the upgrade of controlplain since 1 host(s) cannot reached prior to upgrade"

Rancher v2.4.11 or newer
Node RHEL 7.9
Docker version 1.13.1.203
Kubernetes v1.16.8

Resolution

- Downgrade docker to Version 1.13.1.161 (from Version 1.13.1.204 or 1.13.1.203).
- Remove all files from /var/lib/docker/containers
- Rejoining the nodes with the command line from Rancher UI

The node will join the cluster and upgrade to the cluster set Kubernetes v1.17.4
on all nodes, one by one.

Cause

Docker not working

Additional Information

responsive

Disclaimer

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