Kubernetes

Install K3S

https://github.com/k3s-io/k3s#quick-start—install-script

Install K9S (CLI UI for Kubernetes Management)

wget https://github.com/derailed/k9s/releases/download/v0.40.9/k9s_linux_amd64.deb # Or respective current version
sudo dpkg --install k9s_linux_amd64.deb

Connect to Cluster

If you run your cluster localy, ignore this step.

You can either connect to one of the cluster nodes through ssh and execute commands from there, or setup kubernetes to execute kubectl commands remotly on the cluster. To tell kubectl where to connect to, you need to edit ~/.kube/config

apiVersion: v1
kind: Config

clusters:
- cluster:
    server: https://<ip-of-cluster>:<port>
  name: my-dev-cluster

users:
- name: IAM#....<cluster-url>:<port>
  user:
    token: sha256-******

contexts:
- context:
  name: my-dev-cluster

kubectl config use-context my-dev-cluster

Usefull commands

Nodes

# Show basic info for all nodes
sudo kubectl get nodes

# Show detailed info for all nodes
sudo kubectl describe nodes

Pods

# Get all pods
sudo kubectl get pods -A

Deployment

# Create a new deployment
sudo kubectl create deployment <name-of-deployment> --image=<registry-ip>:<port>/<image>

# Remove deployment
sudo kubectl delete deployment <name-of-deployment>

# Scale Deployment
sudo kubectl scale deployments/<name-of-deployment> --replicas=3

# Show details of the specified deployment
sudo kubectl describe pod -l app=<application/deployment>

K8S

git clone https://github.com/kubernetes/kubernetes
cd kubernetes
make quick-release

sudo snap install microk8s --classic

microk8s status --wait-ready
microk8s enable dashboard dns registry istio

# Show Infos about Kubernetes
microk8s kubectl get all --all-namespaces

microk8s dashboard-proxy