awesome-k8s.md

☸️ K8s awesome command line for day by day!

Intro & Documentation

What is Kubernetes?

Kubernetes is an open source container orchestration engine for automating deployment, scaling, and management of containerized applications. The open source project is hosted by the Cloud Native Computing Foundation (CNCF).

Kubernetes Home

Kubernetes Docs

Kubernetes GitHub

Main command

• kubectl get pod
• kubectl get nodes
• kubectl events
• kubectl namespaces
• kubectl api-resources

Example with some context

Forcing deletion of stuck Pod (in Pending/ContainerCreating status)

kubectl delete pod <PODNAME> --grace-period=0 --force --namespace <NAMESPACE>

Reference StackOverflow

Create a YAML template file for a deployment or pod without creating it (ex. in CKA/CKAD exam context)

kubectl create deployment --image=nginx nginx --dry-run=client -o yaml > nginx-deployment.yaml

kubectl run nginx --image=nginx --dry-run=client -o yaml

Troubleshooting Application commands

Logs of the previous pod if present some stuff

kubectl -n dev logs nginx-app -f --previous

Execute command available on pod to check something on other app/service

kubectl exec middleware -- nc -zv frontend-svc 80

Example output:

frontend-svc (10.2.3.4:80) open

Working and switch contexts with custom namespace

kubectl config use-context docker-desktop

Output: Switched to context "docker-desktop".

kubectl config set-context --current --namespace default [*]

Output: Context "docker-desktop" modified.

kubectl config get-contexts

[*] you also add this to a custom alias in .bashrc file like this:

alias kn="kubectl config set-context --current --namespace"

and run the following alias with your namespace:

kn my-working-namespace