Kubernetes

This page provides documentation and practical guides for using Kubernetes (K3S in my project).

Useful `kubectl` Commands

Get cluster info
Terminal window
```
kubectl cluster-info
```
List all nodes
Terminal window
```
kubectl get nodes
```
List all pods in all namespaces
Terminal window
```
kubectl get pods --all-namespaces
```
List all services
Terminal window
```
kubectl get svc
```
Describe a pod
Terminal window
```
kubectl describe pod <pod-name>
```
View logs of a pod
Terminal window
```
kubectl logs <pod-name>
```
Execute a command in a running pod
Terminal window
```
kubectl exec -it <pod-name> -- /bin/sh
```
Apply a manifest
Terminal window
```
kubectl apply -f <file.yaml>
```
Delete a resource
Terminal window
```
kubectl delete -f <file.yaml>
```

K3S uses containerd instead of Docker. To list local images managed by containerd:

k3s crictl images

To use a local Docker registry with K3S, follow these steps:

Create a local registry container (if not already running):

docker run -d -p 5000:5000 --restart=always --name registry registry:2.7

Configure K3S to use the local registry:

Create the file /etc/rancher/k3s/registries.yaml with the following content:
```
mirrors:
  "localhost:5000":
    endpoint:
      - "http://localhost:5000"
```
Restart K3S to apply the changes:
Terminal window
```
sudo systemctl restart k3s
```

Tag and push your image to the local registry:

docker tag my-image:latest localhost:5000/my-image:latest
docker push localhost:5000/my-image:latest

Reference your image in Kubernetes manifests:
```
image: localhost:5000/my-image:latest
```

These steps will help you manage your K3S cluster, inspect images, and use a local registry for development.