Help with lab - Upgrade the Cluster

I've some problems with lab 4.1 Upgrade The Cluster, after I finished the CP node upgrade the Calico Controller Manager does not start.
NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-kube-controllers-5f6cfd688c-pgm6x 0/1 CrashLoopBackOff 5 4m50s kube-system calico-node-bbtns 1/1 Running 0 7m59s kube-system calico-node-lhxc4 1/1 Running 0 28m kube-system coredns-558bd4d5db-g2l9k 0/1 Running 0 92s kube-system coredns-558bd4d5db-z84b5 0/1 Running 0 92s kube-system coredns-74ff55c5b-d2v8d 0/1 Running 0 4m50s kube-system etcd-cp 1/1 Running 1 64s kube-system kube-apiserver-cp 1/1 Running 1 63s kube-system kube-controller-manager-cp 1/1 Running 0 63s kube-system kube-proxy-7x9gp 1/1 Running 0 14s kube-system kube-proxy-95lcf 1/1 Running 0 38s kube-system kube-scheduler-cp 1/1 Running 0 64s kube-system upgrade-health-check-8bws2 0/1 Completed 0 38s
I'm just follow the instructions and do it the same with worker node. When I drain worker node this happens:
error when evicting pods/"calico-kube-controllers-5f6cfd688c-pgm6x" -n "kube-system" (will retry after 5s): Cannot evict pod as it would violate the pod's disruption budget.
I've check the Pods and Calico Kube Constrollers doest not start.
students@cp:~$ kubectl get pods --all-namespaces NAMESPACE NAME READY STATUS RESTARTS AGE kube-system calico-kube-controllers-5f6cfd688c-pgm6x 0/1 Running 10 10m kube-system calico-node-bbtns 1/1 Running 0 13m kube-system calico-node-lhxc4 1/1 Running 0 34m kube-system coredns-558bd4d5db-csnp8 1/1 Running 0 3m21s kube-system coredns-558bd4d5db-x2g5s 1/1 Running 0 3m21s kube-system etcd-cp 1/1 Running 1 6m32s kube-system kube-apiserver-cp 1/1 Running 1 6m31s kube-system kube-controller-manager-cp 1/1 Running 0 6m31s kube-system kube-proxy-7x9gp 1/1 Running 0 5m42s kube-system kube-proxy-95lcf 1/1 Running 0 6m6s kube-system kube-scheduler-cp 1/1 Running 0 6m32s
When i inspect the logs from calico-kube-controller, I've got this:
main.go 118: Failed to initialize Calico datastore error=Get https://10.96.0.1:443/apis/crd.projectcalico.org/v1/clusterinformations/default: context deadline exceeded
I think the calico does not connect with coredns and i'v delete thoose pods. After that all pods running fine. But i dont know why this happens.
I've tried 2 times this lab and this happens twice. But on the second I've succed and solved the problem.
Comments
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I had this issue, calico-kube-controllers stuck in a crashloop. Deleting the pod fixed the issue, i was then able to drain the worker
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