! Ensure your Kube context points to the correct cluster !

# Trigger the cluster upgrade
`./upgrade_121.sh`

# Upgrade CFN stacks for the control plane and all worker groups

# Reboot controller(s) one by one

# Patch current deployments, blocking ArgoCD otherwise
`./kubezero_121.sh`

# Migrate ArgoCD config for the cluster
`./migrate_argo.sh "cluster/env/kubezero/application.yaml"`

Adjust as needed, eg. ensure eck-operator is enabled if needed.
git add / commit / push

Watch ArgoCD do its work.

# Replace worker nodes 

## Known issues
- pods seem stuck, eg. fluent-bit on workers shows NotReady *after* control nodes have been ugpraded  
  -> restart `kube-proxy` on the affected workers