Kubernetes Common Commands

Kubectl common creation and viewing operations

1. Create deployment

kubectl create -f nginx-deployment.yaml

2. View Deployment

   kubectl get deployment

3. View Pods

kubectl get pod -o wide

4. View details for a pod

   kubectl describe pod nginx-deployment-75d56bb955-bzkv4

5. Test pod Access

   curl --head 10.0.0.2

6. Update deployment

   kubectl set image deployment/nginx-deployment nginx=nginx:1.12.2 --record

7. View Deployment

   kubectl get deployment -o wide

8. View update history (you need to add parameters when performing creation and updating --record )

   kubectl rollout history deployment

9. To view a specific version history

   kubectl rollout history deployment/nginx-deployment --revision=2

10. Quick rollback to previous version

    kubectl rollout undo deployment/nginx-deployment

11. Capacity expansion and shrinking capacity

    kubectl  scale deployment nginx-deployment --replicas 2

12. View back-end load and forwarding rules

    ipvsadm -Ln

Kubectl Operation Example

1. Create a Resource object

• Create service and RC using Yaml file:

  kubectl create -f my-service.yaml -f my-rc.yaml

• Create an operation based on all the. Yaml. yml. json file definitions under the <dir> directory:

  kubectl create -f <dir>

2. View Resource Objects

   kubectl get podskubectl get rc,service

3. Describe the resource object

• Show Node's details

  kubectl describe nodes <node-name>

• Show pod Details

  kubectl describe pods/<pod-name>

• Display pod information managed by RC

  kubectl describe pods <rc-name>

  4. Delete a Resource object
• To delete a pod based on a name defined by Pod.yaml:

  kubectl delete -f pod.yaml

• Delete all pods and service that contain a label:

  kubectl delete pods, services -l name=<label-name>

• Delete all pods:

  kubectl delete pods --all

5. command to execute container

   • Executes the date command for the pod, which is performed by default using the first container in the pod:

     kubectl exec <pod-name> date

   • Specify a container in the pod to execute the date command

     kubectl exec <pod-name> -c <container-name> date

   • Using bash to get a TTY for a container in the pod is equivalent to a login container:

     kubectl exec -it <pod-name> -c <container-name> /bin/bash

6. View the logs for a container
   • To view a log of the container output to stout:

     kubectl logs <pod-name>

   • Trace the log of the view container, which corresponds to the result of the TAIL-F command:

     kubectl logs -f <pod-name> -c <container-name>

Kubernetes Common Commands