Microservices

At times you may need two micro services which were developed and deployed separately to work together such as a web server and a logging service. And that is why you have multi container pods that share the same lifecycle which means they are created together and destroyed together. They share the same network space which means they can refer to each other as local host and they have access to the same storage volumes.

apiVersion: v1
kind: Pod
metadata:
 name: multi-pod
spec:

 restartPolicy: Never

 volumes:
 - name: shared-data
   emptyDir: {}

 containers:

 - name: nginx-container
   image: nginx
   volumeMounts:
   - name: shared-data
     mountPath: /usr/share/nginx/html

 - name: ubuntu-container
   image: ubuntu
   volumeMounts:
   - name: shared-data
     mountPath: /pod-data
   command: ["/bin/sh"]
   args: ["-c", "echo Hello, World!!! > /pod-data/index.html"]

Design Patterns

• Sidecar pattern
• Adapter pattern
• Ambassador pattern.