kubectl_usage.md

Use kubectl in the devops-toolkit

Kubernetes document

Some document to help you start with kubernetes (k8s)

• https://kubernetes.io/docs/home/
• https://github.com/tungbq/devops-basic/tree/main/topics/k8s

Note

To use the existing container instead of creating one, use docker exec command instead of docker run

docker exec -it my_devops_toolkit /bin/bash

Use case 1: Use kubeconfig from the host

Mount the .kube/config file from the host to container

docker run --rm --network host -it -v ~/.kube/config:/root/.kube/config devops-toolkit:latest
###############################################
# Now we are in the docker container terminal #
###############################################
# Command to check k8s node
kubectl get nodes
# Deploy application
kubectl apply -f https://k8s.io/examples/application/deployment.yaml
# View the pod
kubectl get pods -w
# View the deployment
kubectl get deployment
# More command as per your need...

Sample Result

➜  ~ docker run --rm --network host -it -v ~/.kube/config:/root/.kube/config devops-toolkit:latest
root@docker-desktop:~# kubectl get nodes
NAME                 STATUS   ROLES           AGE   VERSION
kind-control-plane   Ready    control-plane   21m   v1.29.2
root@docker-desktop:~# kubectl apply -f https://k8s.io/examples/application/deployment.yaml
deployment.apps/nginx-deployment unchanged
root@docker-desktop:~# kubectl get pods -w
NAME                                READY   STATUS    RESTARTS   AGE
nginx-deployment-86dcfdf4c6-c2cfp   1/1     Running   0          99s
nginx-deployment-86dcfdf4c6-w4vp7   1/1     Running   0          99s
root@docker-desktop:~# kubectl get deployment
NAME               READY   UP-TO-DATE   AVAILABLE   AGE
nginx-deployment   2/2     2            2           115s

Troubleshooting

• For any issues, check this reference