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--- topic:k8 [2024/12/24 17:55] – removed arie
+++ topic:k8 [2024/12/31 09:00] (current) – created - external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== k8 notes of Arie ======
+<code>
+#Bash into container
+k exec -it wiki-dokuwiki-9f9fd859d-2wfx6 bash
+### Useful aliases ###
+kush [-n ns] pod_name   # get shell into pod
+kud pod_name            # kubectl describe pod
+kug pod pod_name        # kubectl get pod_name
+ktail pod_name          # get logs for the pod
+# fetch chart to analyse values.yaml
+helm fetch gitlab/gitlab --untar
+# debug certs
+kug orders,challenges -o wide
+# Delete PV that has finalizers
+pv=pvc-daec7eed-fc8e-4281-a15b-6b370df54804
+echo '{"metadata": {"finalizers": null}}' | kubectl patch pv $pv --patch-file=/dev/stdin
+# Delete POD that got stuck (and no finalizers to delete)
+kubectl delete pods fluent-bit-xczr2 --grace-period=0 --force
+#copy file into pod
+kubectl cp /mnt/common/tmp/run dev/page2-dp-77f87664bb-4l8mc:/tmp/run
+# Delete namespace that got stuck
+namespaceToDelete=brocha
+kubectl get namespace "$namespaceToDelete" -o json | \
+ jq 'del(.spec.finalizers)'   | \
+ kubectl replace --raw /api/v1/namespaces/$namespaceToDelete/finalize -f -
+# drain and evict pods from a node
+kubectl drain --ignore-daemonsets --delete-emptydir-data k8i03
+#untaint
+kubectl uncordon k8i03
+# port forwarding of localport 40090 to port 9090 of the svc
+kubectl port-forward -n monitoring svc/prometheus-k8s 40090:9090 --address='0.0.0.0'
+# see nodes labels
+kug nodes --show-labels
+# remove label worker from a node:
+kubectl label node ip-10-0-7-187.ec2.internal worker-
+# add control-plane label
+kubectl label node k8r05 node-role.kubernetes.io/control-plane=
+kubectl label node k8p01 general=yes
+# See cpu/mem usage by nodes
+kubectl top node
+# Show pod by label
+kug pod -n monitoring -l app.kubernetes.io/name=kube-state-metrics
+# kill pods by label
+kudel pod -n nqa -l app=etljobs-sel
+# watch hpa of gwpa@rnd
+kug hpa -n rnd gwpa-hpa --watch
+# events on API of prod2 farm
+kug events -n prod2
+</code>