K8s Commands

K8s Commands:
==============

    kubectl create -f demo.yaml
    kubectl get pods <pod-name>
    kubectl describe nodes <node-name> - describe detailed info about the resource
    kubectl describe pod <pod-name>
    kubectl delete -f pod.yaml  - Delete Resource
    kubectl delete pods --all
    kubectl exec <pod-name> date
    kubectl exec <pod-name> -c <container-name> date
    kubectl exec -it <pod-name> /bin/bash
    kubectl logs <pod-name>


  Kubeadm commands:
  ==================

    kubeadm init - kubeadm init [flags]  * Initialize Master Node (On Master)
    kubeadm join - kubeadm join --token [] * Initialize Worker Node (On Worker)        
    kubeadm token - kubeadm token [create|delete|list|generate]
    kubeadm version - kubeadm version [flags]
    kubeadm upgrade - kubeadm upgrade plan [version] [flags]

    Pod Manifest file
    ==================

    kubectl create -f pod.yml
    kubectl get pods
    kubectl get pod -o wide
    kubectl describe pod nginx-pod
    kubectl exec -it nginx-pod /bin/sh
    kubectl delete pod nginx-pod

     ReplicaSets and Deployments:
     ----------------------------

    kubectl create -f deploy-def.yml
    kubectl get pods
    kubectl get pod -o wide
    kubectl describe pods
    kubectl get rs
    kubectl get deployments
    kubectl replace -f rs-def.yml
    kubectl scale --replicas=6 -f rs-def.yml
    kubectl rollout status deployment/myapp-deployment
    kubectl rollout history deployment/myapp-deployment
    kubectl rollout undo deployment/myapp-deployment
    kubectl apply -f deploy-def.yml
    kubectl run nginx --image=nginx
    kubectl delete rs <rs-name>

     Updates and Rollback:
     =====================


     create -   kubectl create -f deploy-def.yml
     get   -    kubectl get deployments
     update -   kubectl apply -f deploy-def.yml
     status -   kubectl set image deployment/myapp-deployment nginx=nginx:1.9.1
     Rollout-   kubectl rollout status deployment/myapp-deployment
                kubectl rollout history deployment/myapp-deployment
                kubectl rollout undo deployment/myapp-deployment
    delete -    kubectl delete deployment myapp-deployment


    Services:
    =========

        kubectl create -f service-def.yml
        kubectl get services

    Namespaces:
    ===========

    kubectl create -f pod.yml --namespace=dev => Dev namespace
    kubectl create namespace dev
    kubectl get pods --all-namespaces

    Labels & Selectors:
    ===================

    	- kubectl label node node1 size=Large

    DaemonSets:
    ===========
        kubectl get ds
        kubectl describe ds monitoring-daemon 


    Resource Consumption:
    =====================

        - kubectl top node

    Logs:
    ======

        kubectl logs -f <pod-name>

    ConfigMaps:
    ===========

    kubectl create configmap <config-name> --from-literal= K:V
    kubectl get configmaps
    kubectl describe configmaps

    Secrets:
    ========

    kubectl create secret generic <secret-name> --from-literal=<key>=<value>
    kubectl create secret generic <secret-name> --from-file=<key>=<value>
    kubectl create secret generic app-secret --from-literal=DB_HOST=mysql


    Cluster Maintenance:
    ====================

    kubectl drain node-1
    kubectl uncordon node-1
    kubeadm upgrade plan


    Signing Certificates:
    =====================

    kubectl get csr
    kubectl approve certificate jane
    kubectl get csr jane -o yml


    Persistent Volumes and Claims:
    ==============================

    kubectl create -f pvc-claim.yml
    kubectl get pvc
    kubectl delete pvc <pvc-name>


    Networking Commands:
    ====================

    ip route add 192.168.1.0/24 via 192.168.2.1
    ip route add 172.217.194.0/24 via 192.168.2.1
    ip route add default via 192.168.2.1

    ip link
    ip addr
    ip addr add
    ip route       - route
    ip route add

    DNS Basics:
    ===========

    - nslookup www.google.com
    dig www.google.com