Commands

kubectl get nodes -> list all cluster nodes
kubectl describe nodes -> gives detailed node info
kubectl get namespaces -> describes all namespaces in the cluster
kubectl get pods --all-namespaces -> get pods in namespaces
kubectl get pods -n [namespace] -> get shit in the given namespace
kubectl get deployments --all-namespaces -> list all deployments lol
kubectl get statefulset --all-namespaces -> lists all statefulsets
kubectl top pods --all-namespaces -> gets the top pods lol. also, can work with nodes too
kubectl get events --all-namespaces -> gets all events
kubectl get services -> get all services
kubectl describe service <service-name> -> describe a service lol
kubectl get secrets --all-namespaces -> list all secrets, used for storing sensitive data like passwords and keys etc
kubektl delete pods -l app=[app] -n [namespace] -> delete pods lol
kubectl exec -it [pod name] -n [namespace] -- /bin/sh -> exec a shell in the docker container of the pod
kubectl logs -n [namespace] [pod-name] -> get logs and stuff
kubectl get secret [secret] -o yaml -> get some secret, output it to yaml. you will have to decode the password and shit.
kubectl get services -w -> watch the services
kubectl delete service [service] -> deletes a service
kubectl delete -f [file] -> delete a configuration file

Concepts

Control Plane: master node, which manages workload across the whole system
- API server: serves the kubernetes API
- scheduler
Nodes: a machine where containers/workloads are deployed
- contains kubelet, nameserver, etc
Pod: multiple pods in a node.
- ReplicaSet: a replica of the current applications
- StatefulSets: controller that enforce uniqueness etc among pods

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