====== Pods ======

==Debug running pod without shell access==
<code>
kubectl debug [existing-pod-name] -it --image alpine --share-processes --copy-to=my-new-debug-pod-name
</code>

<code>
kubectl debug -it [existing-pod-name] --share-processes --image=apko.kontain.me/busybox/curl:latest --target=[container_name]
</code>

==Delete terminated pods==
<code>
#!/bin/sh
for namespace in $(kubectl get ns | awk '{print $1}' | grep -v NAME); do
    for pod in $(kubectl get pod -n $namespace --field-selector=status.phase!=Running | grep Terminated | awk '{print $1}' | grep -v NAME); do
      kubectl delete pod -n "$namespace" "$pod"
    done
done
</code>

== Get all pods running on a node ==

<code>
function kpodnode() {
	kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=$1
}
</code>


====== Secrets ======

== Create secret manifest from literal ==

<code>
kubectl create secret generic [secret-name] -o yaml --dry-run --from-literal='ENV_VAR1=value1' \
--from-literal='ENV_VAR2=value2'
</code>

== Create secret from file ==

<code>
kubectl create secret generic [secret-name] -o yaml --dry-run --from-file [filepath]
</code>

==Delete all secrets starting with name wildcard==
<code>
kubectl get secret --no-headers=true | awk '/[secret-partial-name]/{print $1}' | xargs  kubectl delete secret
</code> 

====== Configmaps ======

==Delete all configmaps with custom label==
<code>
kubectl get configmap  --no-headers=true -l label=value -o custom-columns=":metadata.name" | xargs kubectl delete configmap
</code> 

====== Wait ======

== Wait for resource deletion == 

<code>
kubectl wait --for=delete kind/name -n default --timeout=1200s
</code>

====== CRD ======

== Get an object by querying a specific API version ==

<code>
kubectl get [crd].[version].[group]
</code>

Example:
<code>
kubectl get applications.v1alpha1.argoproj.io
</code>

====== GET ==========

== Get objects sorted by creation date ==

<code>
kubectl get [crd] --sort-by=.metadata.creationTimestamp
</code>

====== LABEL ==========

== Label a node ==

<code>
kubectl label nodes k8-master role=master
</code>

====== Volumes ======
==Resize statefulset PVC==
<code>
# for prometheus volumes, delete operator pod first
k scale deploy monitoring-operator --replicas=0
kubectl delete sts --cascade=orphan sts_name
# update pvc size
kubectl edit pvc pvc_name
# update pvc size in sts
kubectl -n ns edit sts sts_name
</code>