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k8s Quick Start/Useful Commands
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kubectl run [podNAME] --image=[imageNAME] --restart=Never  --rm --command -it -- env #Creates pod with name [podNAME], image used is [imageNAME], when comman is executed it will not restart, will remove after complition, --command allows to pass command for execution, will output stdout, passed command
kubectl creat -f [fileNAME.yml] #Creates pod with give parameters from [fileNAME.yml]
kubectl create ns [namespaceNAME] #Creates namespaces
kubectl set image [resource]/[resourceNAME] [containerNAME]=[imageNAME] #Set new image in resource {pod deployment daemonset} without editing yaml
kubectl get pods  #Gives pods brife information default namespace
kubectl get pods -A #Gives pods brife information about all namespaces
kubectl get pods [podNAME] #Gives pods with name brife information about it
kubectl get ns #Shows all namespaces
kubectl get ns [namespaceNAME] #Gives brife info of namespace [namespaceNAME]
kubectl get ns [namespaceNAME] -o yaml #Gives all properties of namespace [namespaceNAME] in yaml format
kubectl get all #Prints out all information default namespace
kubectl get deployments [deploymentNAME] --show-lables #Shows labels which are set on [deploymentNAME]
kubectl get deployments --selector [lableNAME] #Prints out all deployments which has lable [lableNAME]
kubectl get all --selector [lableNAME] #Prints out everything {pod,deployment,service...} which has lable [lableNAME]
kubectl get pod -l [lableNAME]=[lableVALUE],[lableNAME1]=[lableVALUE1],[lableNAME2]=[lableVALUE2] #This print pods with multiple lables in this example it will print pods of this three lables {lableNAME,lableNAME2,lableNAME2}
kubectl describe {deployment|rs|pods} #Gives information about all pods,rs and deployment on host
kubectl describe [podNAME] #Gives information about [podNAME] pod on host
kubectl describe deployment [deploymentNAME] #Gives information about [deploymentNAME] deployment        on host
kubectl delete pod [podNAME] #Deletes type=pod and [podNAME]
kubectl run [NAME_DEPLOYMENT] --image=[imageNAME] #Creates deployment from nginx image with name of [s
kubectl get rs [replicasetNAME] -o yaml #This gives full information about replica
kubectl logs [podNAME] #Gives log information about [podNAME] pod on host
kubectl scale --replicas=3 deployment [deploymentNAME] #This increas number of pods in deployment and replicasets
kubectl create deployment --dry-run --image=[imageNAME] --output=yaml [deploymentNAME] > [NAME.yml] #Creates deployment yaml file to work with using image [imageNAME] and setting deployment name [deploymentNAME]
kubectl get deployment [deploymentNAME]  -o yaml #Gives output of [deploymentNAME] configuration in yaml format
kubectl edit deployment [deploymentNAME] #Editing deployment yaml format, after quiting editor the changes are executing
kubectl get deployment --show-labels #Outputs all deployments with there lableso
kubectl label deployment [deploymentNAME] state=[lableNAME] #Makes lable on depoyment [deploymentNAME] with lable name [lableNAME]
kubectl rollout history deployment [deploymentNAME] #Gives information about deployments revision
kubectl rollout history deployment [deploymentNAME] --revision=[desiredREVISION] #Rollbacks to [desiredREVISION] of deployment [deploymentNAME]
kubectl create cm [configmapNAME] --from-file [fileNAME] #Creates Configmap from file
kubectl run [podNAME] --image=[imageNAME] --dry-run=client -o yaml --restart=Never -- /bin/sh -c "while true; do echo hello; echo hello again;done" > [fileNAME.yaml]
kubectl explain pod --recursive #Prints out the options which could be used for creating yaml file. Get the list of resourses all fields and sub-fields
kubectl create  --namespace=[namespaceNAME] [resourseTYPE] [resourseNAME] #Creates [resourceTYPE] and places it in defined namespace [namespaceNAME]
kubectl logs [podNAME] #Prints [podNAME] container stdout
kubectl logs -p -c [containerNAME] [podNAME] #Return snapshot of previous terminated [containerNAME] container logs from pod [podNAME]
kubectl logs -f -c [containerNAME] podNAME] #Begin streaming following the logs of the [containerNAME] container in pod [podNAME]
kubectl logs [jobNAME]/[containerNAME] #Prints output of job [jobNAME] containers
kubectl exec -it [podNAME] -c [containerNAME] -- sh #In pod [podNAME] inside of it container [containerNAME] executes command sh passed after -- and is attached to interactive shell
kubectl set resources [deploymentNAME/podNAME] -c=[containerNAME] --limits=cpu=200m --limits=memory=512Mi #Set CPU 200m and Memory 512m limit on deploymentNAME/podNAME with containerNAME
kubectl get [resourceNAME] -o custom-columns=NAMESPACE:metadata.namespace,NAME:metadata.name #This parses [resourceNAME] json format, on all or specified and gives us two output in columns set in custom-columns option, first is NAMESPACE:metadata.namespace second NAME:metadata.name
kubectl run [podNAME] --image=[imageNAME] --port=[portNUMBER] --expose #Expose pod with 80 port and create correct service with cluster IP for this pod.
kubectl get [podNAME] -l 'env in (dev,prod)' #Get the pods with labels env=dev and env=prod
kubectl label [podNAME] nginx-dev{1..3} app=nginx #label app=nginx for all the pods named nginx-dev1 nginx-dev2 nginx-dev3 in range  of 3 
kubeadm token create --print-join-command #Pring command for nodes to join cluster
cat fileNAME | base64 -w 0 #Will remove newlines 
echo "CERT" | base64 -d | openssl x509 -text #Output the values from Certifivate in human readable format 
cat [manifestNAME.yaml] | k get -f - #This will output list of all files which where mentioned in [manifestNAME.yaml] file
kubectl exec -it -n kube-system kube-apiserver-controlplane -- kube-apiserver -h | grep -i enable-admission-plugins ##This commands shows us the current enabled admission controllers
kubectl delete pod protmerheus-k8s-{0,1} ##This command will delete pod with name protmerheus-k8s-0 and protmerheus-k8s-1