kubectlcommands.md

Kubernetes Commands for Pod and Cluster Management

1. To Deploy a Pod

Deploy a simple Pod using the kubectl run command:

kubectl run hello-minikube

2. To Get Cluster Info

To get general information about the cluster:

kubectl cluster-info

3. To List All the Nodes in the Cluster

List all nodes in the cluster:

kubectl get nodes

4. To Define an Image for a Pod

Run a Pod with a specified image:

kubectl run nginx --image nginx

(This pulls the image from Docker Hub.)

5. To Get Information About a Pod

Describe a specific Pod to get detailed information:

kubectl describe pod webapp

6. To Delete a Pod

Delete a specific Pod:

kubectl delete pod webapp

7. To Create a Pod Manifest File

Use the --dry-run=client -o yaml option to create a manifest file for a Pod:

kubectl run redis --image=redis123 --dry-run=client -o yaml > redis-definition.yaml

8. To Create a Resource from a Manifest File

Use kubectl create -f to create the resource from the manifest file:

kubectl create -f redis-definition.yaml

9. To Verify Resource Creation

To verify if the Pod is created, run:

kubectl get pods

10. To Edit and Update a Pod

Use the kubectl edit command to update the Pod image:

kubectl edit pod redis

Alternatively, if using a manifest file, update the image directly in the YAML file (using vi or nano) and run:

kubectl apply -f redis-definition.yaml

11. To Describe a Pod

To see detailed information about a specific Pod:

kubectl describe pod newpods-<id>

Or, to view the Pod placement on a node:

kubectl get pods -o wide

12. To Export a Pod Definition to a YAML File

Export the YAML definition of a Pod:

kubectl get pod <pod-name> -o yaml > pod-definition.yaml

13. To Get All the Namespaces

List all Pods in the kube-system namespace:

kubectl get pods --namespace=kube-system

14. To Count the Number of Namespaces

Run the command to get the exact number of namespaces:

kubectl get ns --no-headers | wc -l

15. To Set a Namespace for a Context

Set the default namespace for the current context:

kubectl config set-context $(kubectl config current-context) --namespace=dev

16. To Get Pods in a Specific Namespace

Get Pods from the research namespace:

kubectl -n research get pods

17. To Create a Pod in a Specific Namespace

Create a Pod in the finance namespace:

kubectl run redis --image=redis -n finance

18. To Find a Specific Pod

Search for a specific Pod across all namespaces:

kubectl get pods --all-namespaces | grep blue

Or, to get Pods across all namespaces:

kubectl get pods -A

19. To Find a Specific Service in a Namespace

Get the service from the marketing namespace:

kubectl get svc -n=marketing

20. To Create pod using image

kubectl run nginx --image=nginx

21. create a new pod with your changes using the temporary file

kubectl create -f /tmp/kubectl-edit-ccvrq.yaml