Kubernetes Cookbook - Second Edition

Container-to-container communication

In this scenario, we would focus on the communications between containers within single Pod:

1. Let's create two containers in one Pod: a nginx web application and a CentOS, which checks port 80 on localhost:

// configuration file of creating two containers within a pod$ cat two-container-pod.yamlapiVersion: v1kind: Podmetadata:  name: two-containerspec:  containers:    - name: web      image: nginx      ports:        - containerPort: 80          hostPort: 80    - name: centos      image: centos      command: ["/bin/sh", "-c", "while : ;do curl http://localhost:80/; sleep 30; done"]// create the pod$ kubectl create -f two-container-pod.yamlpod "two-container" created// check the status of the newly-created Pod$ kubectl get pod two-containerNAME READY ...