Kubernetes

Prerequisites:

###Check if you can connect to the cluster

kubectl cluster-info

###Get basic info about nodes and their roles in the cluster

kubectl get nodes

###Get a more detailed description

kubectl get nodes -o wide

###Get information about the pods running in current namespace

kubectl get pods #can be used with -o wide for detailed description

###Create your namespace

kubectl create namespace test

###Delete your namespace

kubectl delete namespace test

###Retrieving pods information from test namespace

kubectl get pods -n test

###Create deployment from CLI

kubectl run <<app-name>>  --image=<<docker_image_url>>

###Exposing deploymemt on NodePort

kubectl expose deployment <<app-name>> --type=NodePort

###Delete deployment

kubectl delete deployment/<<app-name>>

###Get services

kubectl get svc

###Get pods from all namespaces

kubectl get pods --all-namespaces

###Get all components of your cluster in all namespaces(PODs, Deployments, Services, ReplicaSet etc.)

kubectl get all  --all-namespace

###Executing command inside pod

kubectl exec   <<pod_name>> <<cmd>>

###Getting inside a running pod

kubectl exec -it <<pod_name>>  /bin/bash

###Scaling application through deployment

kubectl scale --replicas=<<no_of_replicas>> deploy/<<app-name>>

###Get labels present on pods from every namespace with detailed info

kubectl get pods --show-labels --all-namespaces -o wide

###Apply a configuration using config files

kubectl apply -f <<file_name>>