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TASK_63-Create_Namespaces_in_Kubernetes.md

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Start:         2022-11-26 22:15:49
Finished:   2022-11-26 22:30:10

TASK 63: Create Namespaces on Kubernetes Cluster

Requirements

The Nautilus DevOps team is planning to deploy some micro services on Kubernetes platform. The team has already set up a Kubernetes cluster and now they want set up some namespaces, deployments etc. Based on the current requirements, the team has shared some details as below:

  • Create a namespace named dev and create a POD under it; name the pod dev-nginx-pod and use nginx image with latest tag only and remember to mention tag i.e nginx:latest.

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

Steps

Create the manifest for the namespace and the pod definitions.

$ cat > dev.yml

apiVersion: v1
kind: Namespace
metadata:
  name: dev
  labels:
    app: dev
---
apiVersion: v1
kind: Pod
metadata:
  name: dev-nginx-pod
  namespace: dev
  labels:
    app: dev
spec:
  containers:
    - name: web
      image: nginx:latest

Apply.

kubectl apply -f dev.yml

Check the namespace created.

$ kubectl get ns
NAME                 STATUS   AGE
default              Active   70m
dev                  Active   7s

Check the Pod.

$ kubectl get pods -n dev
NAME            READY   STATUS    RESTARTS   AGE
dev-nginx-pod   1/1     Running   0          44s

Verify that the image is using the correct tag.

$ kubectl describe pod dev-nginx-pod -n dev | grep Image
    Image:          nginx:latest
    Image ID:       docker.io/library/nginx@sha256:e209ac2f37c70c1e0e9873a5f7231e91dcd83fdf1178d8ed36c2ec09974210ba

References