[MANOPD-82730] Kubectl exec doesn't work

[alexarefev]

Description

• kubectl exec doesn't work on clusters deployed with KubMarine 0.10.0

Solution

• The hot-fix solution is to revert the previous changes in defaults.yaml

How to apply

• Manual steps for clusters that were deployed by KubMarine 0.10.0:

1. Remove the kubelet-certificate-authority: /etc/kubernetes/pki/ca.crt string in kubeadm-config configMap
2. Remove the - --kubelet-certificate-authority=/etc/kubernetes/pki/ca.crt string in /etc/kubernetes/manifests/kube-apiserver.yaml on each master

Test Cases

TestCase 1
The hot-fix works

Test Configuration:

• Hardware: 4CPU/4GB
• OS: Ubuntu 20.04
• Inventory: AllInOne

Steps:

1. Deploy Kubernetes cluster
2. Run kubectl exec for any of the pods

Results:

Before	After
kubectl exec doesn't work	kubectl exec works

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Integration CI passed
• Unit tests. If Yes list of new/changed tests with brief description
• There is no merge conflicts