Kubernetes – Pod

It’s possible to create pods with multiple containers inside them. For example, keeping a database container and a data container together in a pod.

Types of Pod

Pods come in two types:

• Single container pod
• Multi container pod

Single Container Pod

Kubectl run can be used to create pods, where we specify an image on the Docker registry which we will pull when creating the pod.

$ kubectl run <name of pod> --image=<name of the image from registry>

Example − Let’s create a pod with a Tomcat image from Docker Hub.

$ kubectl run tomcat --image = tomcat:8.0

Alternatively, you can create the yaml file and then run kubectl create.

apiVersion: v1
kind: Pod
metadata:
   name: Tomcat
spec:
   containers:
   - name: Tomcat
    image: tomcat: 8.0
    ports:
containerPort: 7500
   imagePullPolicy: Always

As soon as the above yaml file is created, we’ll save it as tomcat.yml and run the create command.

$ kubectl create –f tomcat.yml

To describe the pod, use the describe command along with kubectl.

Multi Container Pod

A multi-container pod is created using yaml mail with the container definitions.

apiVersion: v1
kind: Pod
metadata:
   name: Tomcat
spec:
   containers:
   - name: Tomcat
    image: tomcat: 8.0
    ports:
containerPort: 7500
   imagePullPolicy: Always
   -name: Database
   Image: mongoDB
   Ports:
containerPort: 7501
   imagePullPolicy: Always

We’ve created one pod with two containers, one for Tomcat and one for MongoDB, in the above code.