Kube basic cmds

kubectl basic commands

# connect on Pods
kubectl exec -it --namespace=develop my-pod-id -- /bin/ash
# Show pod network on cluster
kubectl get nodes -o jsonpath='{.items[*].spec.podCIDR}'
# Show Pods by <node>
kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node>
# sorting pods
kubectl get pods -o wide --sort-by="{.spec.nodeName}"

kubernetes volume protected

This happens when persistent volume is protected. You should be able to cross verify this:

kubectl describe pvc PVC_NAME | grep Finalizers
Output:
Finalizers:    [kubernetes.io/pvc-protection]

You can fix this by setting finalizers to null using kubectl patch:

kubectl patch pvc PVC_NAME -p '{"metadata":{"finalizers": []}}' --type=merge

EKS CPUthrotting

docker run --cpus CPUS -it python python -m timeit -s 'import hashlib' -n 10000 -v 'haslib.sha512().update(b"foo")'

Export DB dump of a particular database to your machine

$ kubectl exec {{podName}} -n {{namespace}} -- mysqldump -u {{dbUser}} -p{{password}} {{DatabaseName}} > <scriptName>.sql

# Example :
$ kubectl exec mysql-58 -n sql -- mysqldump -u root -proot USERS > dump.sql