Cluster unavailable after upgrading Rancher 2.6.8 to 2.6.14

Hello,

i’m a little bit lost - after upgrade rancher from version 2.6.8 to 2.6.14 my cluster (k8n 1.21.8) is not available anymore.

Logs from kublet on a control plane shows:

I0222 09:17:02.671778 1287 scope.go:111] “RemoveContainer” containerID=“02178146f580295425c7f9d9c3a98e56a594c9e4f8b1178d206f9d145470001a”
E0222 09:17:02.672764 1287 pod_workers.go:190] “Error syncing pod, skipping” err=“failed to "StartContainer" for "cluster-register" with CrashLoopBackOff: "back-off 5m0s restarting failed container=cluster-register pod=cattle-cluster-agent-5686fdd6f-bq8vk_cattle-system(f042a8ef-76a7-4417-b5fb-5b4bf306a78a)"” pod=“cattle-system/cattle-cluster-agent-5686fdd6f-bq8vk” podUID=f042a8ef-76a7-4417-b5fb-5b4bf306a78a
I0222 09:17:09.468373 1287 container_manager_linux.go:510] “Discovered runtime cgroup name” cgroupName=“/system.slice/docker.service”
I0222 09:17:15.679038 1287 scope.go:111] “RemoveContainer” containerID=“02178146f580295425c7f9d9c3a98e56a594c9e4f8b1178d206f9d145470001a”
E0222 09:17:15.679602 1287 pod_workers.go:190] “Error syncing pod, skipping” err=“failed to "StartContainer" for "cluster-register" with CrashLoopBackOff: "back-off 5m0s restarting failed container=cluster-register pod=cattle-cluster-agent-5686fdd6f-bq8vk_cattle-system(f042a8ef-76a7-4417-b5fb-5b4bf306a78a)"” pod=“cattle-system/cattle-cluster-agent-5686fdd6f-bq8vk” podUID=f042a8ef-76a7-4417-b5fb-5b4bf306a78a

Any idea what to do? The cattle-cluster-agent pod does not have any logs.

:~$ sudo docker ps
CONTAINER ID   IMAGE                                           COMMAND                  CREATED          STATUS          PORTS     NAMES
4e25a4bfcba5   rancher/mirrored-pause:3.4.1                    "/pause"                 10 minutes ago   Up 10 minutes             k8s_POD_cattle-cluster-agent-5686fdd6f-bq8vk_cattle-system_f042a8ef-76a7-4417-b5fb-5b4bf306a78a_4
832537627c1a   b77f357cacfc                                    "run.sh"                 25 minutes ago   Up 25 minutes             k8s_agent_cattle-node-agent-67mm6_cattle-system_8a8293ea-b160-4957-bffe-11b12d854b78_0
bc6be195585c   rancher/mirrored-pause:3.4.1                    "/pause"                 25 minutes ago   Up 25 minutes             k8s_POD_cattle-node-agent-67mm6_cattle-system_8a8293ea-b160-4957-bffe-11b12d854b78_0
8eeada685b7a   e6ea68648f0c                                    "/opt/bin/flanneld -…"   18 hours ago     Up 18 hours               k8s_kube-flannel_canal-wwxln_kube-system_66f1ac20-fe19-41f4-a231-437f94edcc50_6
3138b6edcfaa   7aa1277761b5                                    "start_runit"            18 hours ago     Up 18 hours               k8s_calico-node_canal-wwxln_kube-system_66f1ac20-fe19-41f4-a231-437f94edcc50_6
a5613eb55c27   0018da5eed5f                                    "/bin/sh -c 'kube-ap…"   18 hours ago     Up 18 hours               k8s_kube-api-auth_kube-api-auth-wbb7h_cattle-system_30b00a8a-ceeb-4413-be97-b97a44c44b01_2
6b1f91035ae1   rancher/mirrored-pause:3.4.1                    "/pause"                 18 hours ago     Up 18 hours               k8s_POD_kube-api-auth-wbb7h_cattle-system_30b00a8a-ceeb-4413-be97-b97a44c44b01_2
9d594adaadf8   rancher/mirrored-pause:3.4.1                    "/pause"                 18 hours ago     Up 18 hours               k8s_POD_canal-wwxln_kube-system_66f1ac20-fe19-41f4-a231-437f94edcc50_6
46e483cc2227   rancher/hyperkube:v1.21.8-rancher2              "/opt/rke-tools/entr…"   2 years ago      Up 18 hours               kube-proxy
2f959af1605b   rancher/hyperkube:v1.21.8-rancher2              "/opt/rke-tools/entr…"   2 years ago      Up 18 hours               kubelet
38869552a814   rancher/hyperkube:v1.21.8-rancher2              "/opt/rke-tools/entr…"   2 years ago      Up 18 hours               kube-scheduler
3f9b447a21f7   rancher/hyperkube:v1.21.8-rancher2              "/opt/rke-tools/entr…"   2 years ago      Up 18 hours               kube-controller-manager
c1947695406c   rancher/hyperkube:v1.21.8-rancher2              "/opt/rke-tools/entr…"   2 years ago      Up 18 hours               kube-apiserver
ea77acc4d66e   rancher/mirrored-coreos-etcd:v3.4.16-rancher1   "/usr/local/bin/etcd…"   2 years ago      Up 18 hours               etcd