Helpful kubectl Commands

Set Default Namespace

kubectl config set-context --current --namespace=services

List All Pods in a Bad State

#!/bin/bash

if [ $# -gt 0 ]; then
    KUBECTL_OPTS="$*"
else
    KUBECTL_OPTS=-A
fi

kubectl get pods ${KUBECTL_OPTS} | grep -v -e Running -e Completed
kubectl get pods ${KUBECTL_OPTS} | grep Running | grep -vE '(1/1|2/2|3/3|4/4|5/5|6/6)'
kubectl get pods ${KUBECTL_OPTS} | grep wait-for.*Running

Delete a Resource

By resource name:

kubectl delete -n <namespace> <resource>

Create a Resource

Using a YAML file:

kubectl apply -f file.yaml

Port Forward to Container in Pod

Port forward to access application in cluster

kubectl port-forward <pod> -c <container> 28015:27017

Get Logs of Container in Pod

kubectl get logs -n <namespace> <pod> <container>

Follow logs:

kubectl get logs -f -n <namespace> <pod> <container>

Get Shell in Running Container

kubectl exec -it -n <namespace> <pod> <container> -- /bin/sh

Restart all the Pods in a DaemonSet

kubectl rollout restart daemonset <daemonset_name>