Differences

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--- kubernetes:kubectl [2022/06/05 10:37]
admin
+++ 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>
+<code>
+kubectl debug -it [existing-pod-name] --share-processes --image=apko.kontain.me/busybox/curl:latest --target=[container_name]
+</code>
 ==Delete terminated pods==
@@ Line 10: / Line 19: @@
 done
 </code>
-==Get secrets with name wildcard==
-<code>
-kubectl get secret --no-headers=true | awk '/db-container-v8-credentials/{print $1}' | xargs  kubectl delete secret
-</code>
 == Get all pods running on a node ==
@@ Line 23: / Line 27: @@
 }
 </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>