📘 Kubernetes Beginner Guide

🔧 Cluster & Namespace Basics

kubectl get nodes                  ==> Shows number of Nodes of cluster
kubectl cluster-info              ==> Gives the cluster info 
kubectl config get-contexts       ==> Shows config files for remote access
kubectl get namespace /ns         ==> Lists namespaces
kubectl create ns batch39         ==> Creates namespace 'batch39'
kubectl create -f phatan.yaml     ==> Creates namespace using YAML
kubectl apply -f pathan.yaml      ==> Creates or updates using YAML
    

📦 Pod & ReplicaSet Management

kubectl get nodes / no
kubectl get pods / pods
kubectl get pods -o wide                  ==> Shows running pods in wide format
kubectl get pods -l app=nginx             ==> Filters pods with label app=nginx
kubectl get pods -n default
kubectl get pods -n my-nginx-podsapce
kubectl get pods --all-namespaces | grep nginx

kubectl get replicaset / rs
    

🌐 Service & Deployment

kubectl get service / svc
kubectl get svc -n default                ==> Services in default namespace
kubectl edit svc nginx -n      ==> Edit service type

kubectl describe (no, po, rs, svc)
kubectl delete (no, po, rs, svc)
    

🚀 Run & Expose

kubectl run nginx --image=nginx:1.6       ==> Deploy nginx v1.6
kubectl run nginx --image=nginx:latest    ==> Deploy latest nginx

kubectl expose pod nginx --port=80 --target-port=80 --type=LoadBalancer -n my-nginx-podspace
kubectl expose deployment nginx --port=80 --target-port=80 --type=LoadBalancer -n my-nginx-podspace
    

Note: -n flag specifies the namespace.