Pod terminated during upgrade process

General Discussions
1

Cluster information:

Kubernetes version: 1.21.2
Cloud being used: Baremetal
Installation method: Kubespray
Host OS: CentOS 7
CNI and version:
CRI and version:

Hi,

I have installed the setup and I was trying to upgrade the K8s cluster to 1.21.4. During the upgraded process, when worker node was getting upgraded, a Pod running on it got terminated. My question why is Kubelet terminating a Pod even if container runtime is not being upgraded? Is there any specific reason behind this behavior?

Regards,
Amit

2

The kubespray playbooks use kubeadm as the underlying tool.

All containers are restarted after upgrade, because the container spec hash value is changed.