Introduction to Kubernetes

Basic Kubernetes client commands to check first

Basic commands for kubectl

Run kubectl basic commands:

kubectl cluster-info
kubectl get nodes
kubectl get nodes -o wide
kubectl describe nodes
kubectl get namespaces
kubectl get ns
kubectl get pods --namespace kube-system
kubectl get pods -n kube-system -o wide
kubectl get pods --all-namespaces
kubectl get pods -A -o wide
kubectl describe pods -n kube-system
kubectl get events --all-namespaces
kubectl get events --sort-by='.lastTimestamp' -A
kubectl api-resources
kubectl explain pod
kubectl explain pod --recursive

You will find more commands and options in the official kubectl Cheat Sheet

Learn how to use labels

Check labels for nodes and add label roles:

kubectl get nodes --show-labels
kubectl label node worker2 disk=ssd

Show the labels once again and try to find the label disk=ssd:

kubectl get nodes --show-labels

Remove label from node:

kubectl label node worker2 disk-

Learn how to generate example yaml manifests

Generate yaml template manifest for Pod:

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

Generate yaml template manifest for Deployment:

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

Generate yaml template manifest for Service:

kubectl create service clusterip my-service --tcp=8080 --dry-run=client -o yaml

How to dry run Pod containers

Start the example busybox Pod container from the command line:

kubectl run busybox --image=busybox --dry-run=client -- sleep 3600

Start the example debian Pod container from the command line:

kubectl run test --image=debian --dry-run=server -- sleep 3600