andrewevans1 / devopskubernetes

Project repo for kubernetes course

DevOps Kubernetes Project

Project Description

As a Kubernetes developer, demonstrate the usage of Volume to communicate between two Containers running in the same Pod. Check the health of the running pod by describing it with the list of events, inspecting its logs, and finally debugging its containers.

Configure Environment

Initialize Kubernetes Cluster

minikube start

Deploy Pod

Create a configuration yaml file:

vim pod.yaml

Set the following contents:

apiVersion: v1
kind: Pod
metadata:
  name: multi-container
spec: 
  terminationGracePeriodSeconds: 0
  containers:
  - name: webserver
    image: nginx:latest
    ports:
    - containerPort: 80
    volumeMounts:
    - name: html-volume
      mountPath: /usr/share/nginx/html
  - name: worker
    image: nginx:latest
    command: ["/bin/sh"]
    args: ["-c", "while true; do date > /usr/share/nginx/html/index.html; sleep 1; done"]
    volumeMounts:
    - name: html-volume
      mountPath: /usr/share/nginx/html
  volumes:
  - name: html-volume
    hostPath:
      path: /usr/share/nginx/html
      type: DirectoryOrCreate

Create the pod:

kubectl create -f pod.yaml

Forward port across kubernetes kubectl port-forward --address 0.0.0.0 pod/multi-container 1313:80 We exposed port 80 on the container (default for nginx), but the container is nested within Kubernetes. This way we can bind kubernetes to port 1313 and it will direct us to our container.

Navigate to localhost:1313/index.html in a browser, the current date should be presented. If you refresh, the time will update due to the second container editing the file in the shared volume.

Inspect the Pod

Describe the pod

kubectl describe pods multi-container

Inspect pod logs:

kubectl logs multi-container webserver

kubectl logs multi-container worker