Create a init containers with example.

 Question: -

Create a YAML manifest for a pod named complex-pod. The main application container named app should use the image nginx and expose the container port 80. Modify the YAML manifest so that the pod defines an init container named setup that uses the image busybox. The init container runs the command wget -O- google.com

Answer: -

you can start by generating the yaml manifest in dry-run mode. the resulting manifest will setup the main application container:

  kubectl run complex-pod --image=nginx --port=80 --dry-run=client -o yaml >complex-pod.yaml

then update the manifest accordingly. 

 1. Add the init container and changing some of the default settings that have been generated. The finalized manifest could look as below.

apiVersion: v1

kind: Pod

metadata:

  creationTimestamp: null

  labels:

    run: complex-pod

  name: complex-pod

spec:

  initContainers:

  - name: setup

    image: busybox

    command: ['sh' , '-c' , 'wget -O- google.com']

  containers:

  - image: nginx

    name: complex-pod

    ports:

    - containerPort: 80

    resources: {}

  dnsPolicy: ClusterFirst

  restartPolicy: Always

status: {}

link :- what is init container and how to create a init containers in AKS. - YouTube