kubernetes - Multi container Pod

                        
We already discussed that a pod is group of one or more containers working together. A Simple use case can be a pod having 2 containers , one as a web interface and the other one having a database running. There will be a communication between the 2 containers ( web interface and sql ). In this article we will see how we can create a pod with multiple containers,

Create a pod manifest file as

[root@manja17-I13330 kube-testing]# cat basic-pod.yml

apiVersion: v1

kind: Pod

metadata:

 name: testing-service

spec:

 containers:

   - name: test-ser

     image: docker.io/jagadesh1982/testing-service

     ports:

     - containerPort: 9876

   - name: shell

     image: centos:7

     command:

       - "bin/bash"

       - "-c"

       - "sleep 10000"

[root@manja17-I13330 ]# kubectl create -f basic-multi-container-pod.yml

pod "testing-service" created

[root@manja17-I13330 kube-testing]# kubectl get pods

NAME                    READY STATUS RESTARTS   AGE

sample-test-c9lcw   1/1 Running   0 23h

testing-service        2/2 Running 0               56s

We can see that the multi container pod testing-service is created and if you the

ready element , we have 2/2 which mean we have 2 containers running inside
that testing-service pod.

In the above configuration we can see we have created 2 containers with names ,

test-ser and shell. in the pod. We can now connect to these container using the
name of the container.

If you need to find out what containers are running inside a pod ,we can use

the “kubectl describe pod testing-service” which will give the details of the
containers running in that pod.