Info
Small script and take a note to interact between
kubectland your kubernetes cluster.
You can explore command with kubectl in some place, including
Helpful command
Get base64 decode of secret with no more 3th party
kubectl get secrets -n <namespace> <secret> -o go-template='{{range $k,$v := .data}}{{"### "}}{{$k}}{{"\n"}}{{$v|base64decode}}{{"\n\n"}}{{end}}'Debug your node via kubectl
kubectl debug node/my-node -it --image=<img>Check the resource of workload with resource-capacity extension
Download via krew, find out the step at krew installing
# Extension: https://github.com/robscott/kube-capacity
# Check the available resources
kubectl resource-capacity -a
# Check detail resource utilize of all workload
kubectl resource-capacity -p --utilScale down the statefulset application
# Use scale option
kubectl scale --replicas=0 sts <sts name>
# Or we can use patch or edit option
kubectl patch statefulsets <stateful-set-name> -p '{"spec":{"replicas":<new-replicas>}}'You need to consider when apply scaling down can not working because “cannot scale down a StatefulSet when any of the stateful Pods it manages is unhealthy. Scaling down only takes place after those stateful Pods become running and ready.” . Read more in: Scale a StatefulSet
Delete pods with not on state Running
k delete pods -n <name-space> --field-selector=status.phase!=RunningDelete all component inside cluster
# For example: Delete all pvc in namespace default
kubectl delete pvc --all Create the generic secrets from file, for example binary file with auto convert to base64 format
kubectl create secret generic accounts-identityserver-certificate --from-file=certificate.pfx --dry-run=client -o yaml > certificate_sec.yaml Check currently config context
kubectl config view --minifyChange default storage class for your node
kubectl patch storageclass <sc-specific> -p '{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}'