Ans: Pod is a group of one or more Containers, A atom inside the container which manages the IP & Port configurations.

below are the list of commands for Pod

kubectl get pods

kubectl create -f pod1.yaml -n=vijay

kubectl apply -f pod1.yaml -n=vijay

kubectl get pods -n=vijay

kubectl get pods -n=vijay-o wide –show-labels

kubectl delete -f pod1.yaml -n=vijay

apiVersion: v1
kind: Pod
metadata:
  name: vijay
  labels:
    app: helloworld
spec:
  containers:
  - name: vjcontainer
    image: scmgalaxy/nginx-vjcontainer
    ports:
    - name: nginx-port
      containerPort: 80

1. What is ReplicationController – in 4 lines with 1 YAML example

Ans: A ReplicationController ensures that a specified number of pod replicas are running at any one time. Replication contains multiple POD.

below are list of commands for ReplicationController

kubectl create -f rc.yaml -n=vijay

kubectl get rc -n=vijay

kubectl apply -f rc.yaml -n=vijay

kubectl delete rc replicationcontroller-example -n=vijay

apiVersion: v1
kind: ReplicationController
metadata:
  name: replicationcontroller-example
spec:
  replicas: 3
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: scmgalaxy/nginx-devopsschoolv1

1. What is ReplicaSets – in 4 lines with 1 YAML example

Ans: A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time.

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: replicaset-example
  labels:
    app: guestbook
    tier: frontend
spec:
  # modify replicas according to your case
  replicas: 3
  selector:
    matchLabels:
      tier: frontend
  template:
    metadata:
      labels:
        tier: frontend
    spec:
      containers:
      - name: php-redis
        image: gcr.io/google_samples/gb-frontend:v3

1. What is Deployment – in 10 lines with 1 YAML example

Ans: A Deployment provides declarative updates for Pods and ReplicaSets.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
  labels:
    app: nginx
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80

Ans: Docker is a Container management tool, where we can run the applications with less infrastructure.

2) What is Container – in 3 lines

Ans: Container is a Virtual Machine with no Kernal. which contains Net,PID,RootFileSystem,UserFileSystem

3) Top 10 commands with 1 example of using docker container

docker create --name=container_name image_name-> create Container 
docker start container_name -> start Container 
docker stop container_name -> stop Container 
docker restart container_name -> restart Container 
docker pause container_name -> pause Container 
docker kill container_name -> kill Container 
docker unpause container_name -> unpause Container 
docker rm container_name -> remove Container 
docker run -itd --name=container_name image_name -> create start Container
docker rename container_name new_container_name  -> rename the container
docker ps -a -> list all the running containers
docker exec -it container_name /bin/bash -> go inside the container
docker inspect container_name -> inspect the container

4) 5 commands with 1 example of using docker image

docker images -> list of images
docker pull image_name -> pull the image from registry
docker rmi image_name -> remove the image
docker save -i image_name.tar image_name -> save the image as tar
docker load -o image_name.tar -> load the image
docker commit -m"message" image_name  

5) 5 commands with 1 example of using docker registry

docker login -> login to registery
docker logout -> logout to registery
docker push image_name repositoryName -> push the image to registery
docker tag image_name new_image_name -> rename the image