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TASK_74-Create_Replicaset_in_Kubernetes_Cluster.md

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Start:         2022-12-21 15:15:03
Finished:   2022-12-21 15:23:40

TASK 74: Create Replicaset in Kubernetes Cluster

Requirements

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 httpd image with latest tag only and remember to mention tag httpd:latest and name it as httpd-replicaset
  • Labels app should be httpd_app, labels type should be front-end. The container should be named as httpd-container; also make sure replicas counts are 4.

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

Steps

Create the YAML file for the replicaset.

$ vi httpd.yml 

apiVersion: apps/v1
kind: ReplicaSet
metadata:
  name: httpd-replicaset
  labels:
    app: httpd_app
    type: front-end
spec:
  replicas: 4
  selector:
    matchLabels:
      app: httpd_app
  template:
    metadata:
      labels:
        app: httpd_app
        type: front-end
    spec:
      containers:
        - name: httpd-container
          image: httpd:latest

Run the manifest.

kubectl apply -f httpd.yml

Check the pods. It may take some time for the status to change from ContainerCreating to Running.

thor@jump_host ~$ kubectl get pods
NAME                     READY   STATUS              RESTARTS   AGE
httpd-replicaset-5msz9   0/1     ContainerCreating   0          16s
httpd-replicaset-b8mkc   0/1     ContainerCreating   0          16s
httpd-replicaset-gbrhg   0/1     ContainerCreating   0          16s
httpd-replicaset-rww56   0/1     ContainerCreating   0          16s

thor@jump_host ~$ kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
httpd-replicaset-5msz9   1/1     Running   0          23s
httpd-replicaset-b8mkc   1/1     Running   0          23s
httpd-replicaset-gbrhg   1/1     Running   0          23s
httpd-replicaset-rww56   1/1     Running   0          23s

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