Create a ReplicaSet in kubernetes

 Task:

The Nautilus DevOps team is going to deploy some applications on kubernetes cluster as they are planning to migrate some of their existing applications there. Recently one of the team members has been assigned a task to write a template as per details mentioned below:

Create a ReplicaSet using nginx image with latest tag only and remember to mention tag i.e nginx:latest and name it as nginx-replicaset.

Labels app should be nginx_app, labels type should be front-end. The container should be named as nginx-container; also make sure replicas counts are 4.

Note: The kubectl utility on jump_host has been configured to work with the kubernetes cluster.

Step 1) Create an yaml file with given specifications. 

thor@jump_host ~$ cat rs.yaml 

apiVersion: apps/v1

kind: ReplicaSet

metadata:

  name: nginx-replicaset

  labels:

    app: nginx_app

    type: front-end

spec:

  replicas: 4

  selector:

    matchLabels:

      type: front-end

  template:

    metadata:

      labels:

        type: front-end

    spec:

      containers:

      - name: nginx-container

        image: nginx:latest

Step 2) Deploy the replicaset yaml file

thor@jump_host ~$ kubectl create -f rs.yaml 

replicaset.apps/nginx-replicaset created

Step 3) Validate the replica set

thor@jump_host ~$ kubectl get rs

NAME               DESIRED   CURRENT   READY   AGE

nginx-replicaset   4         4         4       40s

thor@jump_host ~$ kubectl get pods

NAME                     READY   STATUS    RESTARTS   AGE

nginx-replicaset-mgkwf   1/1     Running   0          48s

nginx-replicaset-ttj9l   1/1     Running   0          48s

nginx-replicaset-vp59p   1/1     Running   0          48s

nginx-replicaset-zkbhl   1/1     Running   0          48s