Example of bashrc/zshrc kubectl function for multi-namespace/multi-region

kubectl_function.sh

# one function per cluster/region

function kus() {
case $1 in
  # set namespace based on first arg
  red)
    kubectl --context=kube-prod-us --namespace=red ${@:2}
  ;;
  green)
    kubectl --context=kube-prod-us --namespace=green ${@:2}
  ;;
  blue)
    kubectl --context=kube-prod-us --namespace=blue ${@:2}
  ;;
  #If no namespace is specified, pass on args to just the context
  *) 
    kubectl --context=kube-prod-us $@
esac
}

function keu() {
case $1 in
  red)
    kubectl --context=kube-prod-eu --namespace=red ${@:2}
    ;;
  green)
    kubectl --context=kube-prod-eu --namespace=green ${@:2}
    ;;
  blue)
    kubectl --context=kube-prod-eu --namespace=blue ${@:2}
  ;;
  *)
    kubectl --context=kube-prod-eu $@
esac
}