Differences

This shows you the differences between two versions of the page.

--- kubernetes:kubectl [2022/05/29 08:59]
admin kubectl commands
+++ kubernetes:kubectl [2024/11/22 08:24] (current)
admin
@@ Line 1: / Line 1: @@
-====== kubectl ======
+====== 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>
-==Get secrets with name wildcard==
+<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>
-kubectl get secret --no-headers=true | awk '/db-container-v8-credentials/{print $1}' | xargs  kubectl delete secret
+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>