kubelet-upgrade-doc: Add instruction to replace image
This commit adds a replace command to replace the old hyperkube image
and use the new kubelet only image.
@@ -51,6 +51,7 @@ Run the following commands:
```bash
export latest_kube=<latest kubernetes version e.g. v1.18.0>
+sudo sed -i "s|.*KUBELET_IMAGE_URL.*|KUBELET_IMAGE_URL=quay.io/poseidon/kubelet|g" /etc/kubernetes/kubelet.env
sudo sed -i "s|.*KUBELET_IMAGE_TAG.*|KUBELET_IMAGE_TAG=${latest_kube}|g" /etc/kubernetes/kubelet.env
sudo systemctl restart kubelet
sudo journalctl -fu kubelet
