Kubernetes Basic Training

March 27, 2025

1. Connect to the Server Node

ssh nico@192.168.1.52

sudo su -

cd /opt/k3s

# show Manifests
ls -la

2. The Kubernetes API (kubectl)

Kubernetes provides us with an API for creating and managing the Deployments, PODs , Services and Ingresses and much more
If you don’t want to install this locally the run this in the cluster

2.1 Creating a Namespace nginx

kubectl create namespace nginx

2.2 Listing the Clusters Nodes

Run the command :

kubectl get nodes

2.3 Deploying the Application as POD/s

kubectl apply -f nginx-deployment.yml --namespace nginx

# Check the deployment
kubectl get pods -l app=nginx --output=wide --namespace nginx

2.4 Creating the Service

kubectl apply -f nginx-service.yml --namespace nginx

# List services
kubectl get svc --namespace nginx

2.5 Creating the Ingress

kubectl apply -f service-exposed.yaml --namespace nginx
# Check is service is exposed run this command
curl localhost:80

2.6 Listing the PODs

kubectl get pod --namespace nginx

2.7 Looking at the Logs of a Pod

kubectl get pods -l app=nginx --output=wide --namespace nginx

kubectl logs <pod-name> -n nginx

3. K9S Demo

k9s --kubeconfig /etc/rancher/k3s/k3s.yaml

3.1 List Namespaces

:ns

3.2 List PODs

:pod

3.2.1 List Log of a POD

# Navigate to pod press L
l