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WorkingWithKubectl.md

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Kubectl

To get the kubectl version
kubectl version (or) kubectl version --client

To get all the running things(like PODs, ReplicaSets, Deployments etc..)

kubectl get all

Working with Nodes

To get the running Nodes
kubectl get nodes
To get the running Nodes with extended details
kubectl get nodes -o wide

Working with PODs

To create a new POD with running an application image.
  • To create the POD directly without using .yaml file.
kubectl run applicationName --image=imageNameInDockerRepository
sample command to create a nginx pod:
kubectl run nginx --image=nginx
To create a pod with yaml file.
kubectl create -f application.yaml 
        (or)
kubectl apply -f application.yaml
To get the running PODs
kubectl get pods
To get the running PODs with more details (like ipadd of POD, Node in which POD is running.. etc)
kubectl get pods -o wide
To get the more details about the POD.
kubectl describe pod podName
To delete the running POD
kubectl delete pod podName
To edit and rebuild the running POD
  • This command will update the template and will recreate the POD
kubectl edit pod podName

Working with ReplicaSets

To create a new replicaSet.
kubectl create -f  application.yaml
To get the details of replicaSet.
kubectl get replicaset
sample Example:
NAME               DESIRED   CURRENT   READY   AGE
myapp-replicaset   3         3         3       118s
nginx-76df748b9    1         1         1       27h
kubectl get replicaset -o wide
sample Example:
NAME               DESIRED   CURRENT   READY   AGE     CONTAINERS   IMAGES   SELECTOR
myapp-replicaset   3         3         3       2m52s   nginx        nginx    environment=test
nginx-76df748b9    1         1         1       27h     nginx        nginx    pod-template-hash=76df748b9,run=nginx
To delete the replicaSet.
kubectl delete replicaset replicaSetName
To get the more details about the replicaSet.
kubectl describe replicaset replicaSetName
To edit/update the exisiting replicaSet.
  • Update the application.yaml and run the following command
kubectl replace -f updatedApplication.yaml
  • This command will update the template and will recreate the replicaSet
kubectl edit replicaset replicaSetName
  • This following command will scale the replicaSet as provided.
kubectl scale --replicas=6 replicaset replicaSetName
                 (or)
kubectl scale --replicas=6 -f application.yaml

Working with Deployment

To create a new deployment with application.yaml file.
kubectl create -f  application.yaml
            [or]
kubectl apply -f  application.yaml
To get the details of deployment.
kubectl get deployment
sample Example:
NAME             READY   UP-TO-DATE   AVAILABLE   AGE
httpd-frontend   0/3     3            0           11s
nginx            1/1     1            1           46h
kubectl get deployment -o wide
sample Example:
NAME             READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS       IMAGES             SELECTOR
httpd-frontend   1/3     3            1           33s   httpd-frontend   httpd:2.4-alpine   name=webapp
nginx            1/1     1            1           46h   nginx            nginx              run=nginx
To delete the deployment.
kubectl delete deployment deploymentName
To get the more details about the replicaSet.
kubectl describe deployment deploymentName