k8s-rancher-cheat-sheet.sh

# check supported k8s versions 
rke config --list-version --all

# upgrade rancher via helm
helm repo update
helm get values rancher # use values below with set 
helm  upgrade rancher rancher-stable/rancher \
    --set hostname=k8smgmt.xxxx.com \
    --set ingress.tls.source=secret \
    --set proxy=http://10.2.3.124:3128 \
    --set noproxy="127.0.0.0/8\,10.2.0.0/16\,172.17.0.0/16"
 
# enable rancher debugging
kubectl -n cattle-system get pods -l app=rancher | grep '1/1' | awk '{ print $1 }' | xargs -I{} kubectl --kubeconfig $KUBECONFIG -n cattle-system exec {} -- loglevel --set debug
kubectl --kubeconfig $KUBECONFIG -n cattle-system logs -l app=rancher

#disable rancher debugging
kubectl -n cattle-system get pods -l app=rancher | grep '1/1' | awk '{ print $1 }' | xargs -I{} kubectl --kubeconfig $KUBECONFIG -n cattle-system exec {} -- loglevel --set info

# delete all evicted pods from all namespaces
kubectl get pods --all-namespaces | grep Evicted | awk '{print $2 " --namespace=" $1}' | xargs kubectl delete pod

# take one-time etcd snapshot 
rke etcd snapshot-save --name <SNAPSHOT.db> --config rancher-cluster.yaml