Multi-Container Pods

Question 1

What is the purpose of a multi-container pod?

Answer 1

It allows tightly-coupled services, e.g. logging agents, to have the same lifecycle as the application they serve.
They share the same network space (addressable via localhost) and storage volumes

Question 2

What are the three common patterns for multi-container pods?

Answer 2

sidecar
adapter
ambassador

Question 3

What is an example of a sidecar multi-container Pod pattern?

Answer 3

logging agent being deployed alongside an application (e.g. web server)

Question 4

What is the purpose of the adapter multi-container Pod pattern?

Answer 4

The adapter is a sidecar that converts messages or data into a common format (it ‘adapts’ the data) for use in another service hosted outside the pod.

Question 5

What is the purpose of the ambassador pattern?

Answer 5

The ambassador is a sidecar which contains logic to adapt the Pod (e.g. proxying requests) to different contexts (e.g. dev, test, prod) that a Pod may be deployed within.