Steps to create a multi-container YAML manifest for a POD in kubernetes

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Create a Multi-Container YAML Manifest for a Pod

In this blog, we will create a build pipeline for a project using a Kubernetes cluster. We will set up a multi-container pod with two containers: one for an HTTP server and another for testing the application.

Create a manifest file for multi-container. I will break the file in smaller section for understanding purpose:

`1. Open vi editor to make a file multicontainer.yaml

apiVersion: v1
kind: Pod
metadata:
  name: multicontainerpod   -- is the name of container
  labels:
    app: demoapp

2. Create an HTTP server container named container1 using nginx.

spec: 
  containers:
  - name: container1
    image: nginx:latest

3. Specify the ports and memory usage.

ports:
- containerPort: 80
resources:
  limits:
    memory: "256Mi"
    cpu: "500m"
  requests:
    memory: "128Mi"
    cpu: "250m"

4. Create a new container, container2, to record incoming requests.

name: container2
  image: busybox:latest

5. Add a script to show a message confirming it’s from container-2. You will test this in the next challenge.

command: ["sh", "-c", "while true; do echo Hello I am Container2; sleep 5; done"]

6.Specify the resources for container2 as shown below:

resources:
  limits:
    memory: "128Mi"
    cpu: "250m"
  requests:
     memory: "64Mi"
     cpu: "125m"

7. Save the file.

Complete file as:

apiVersion: v1
kind: Pod
metadata:
  name: multicontainerpod   
  labels:
    app: demoapp
spec: 
  containers:
  - name: container1
    image: nginx:latest
    ports:
    - containerPort: 80
    resources:
      limits:
        memory: "256Mi"
        cpu: "500m"
      requests:
        memory: "128Mi"
        cpu: "250m"
  - name: container2
    image: busybox:latest
    command: ["sh", "-c", "while true; do echo Hello I am Container2; sleep 5; done"]
    resources:
      limits:
        memory: "128Mi"
        cpu: "250m"
      requests:
        memory: "64Mi"
        cpu: "125m"

Run the Kubectl command to apply

kubectl  apply -f multi.yaml
pod/multicontainerpod created

Check the pods

kubectl get pods
NAME                READY   STATUS    RESTARTS   AGE
multicontainerpod   2/2     Running   0          96s

Check with describe commands

kubectl describe pod