Containers

Question 1

What is containerization?

Answer 1

The assembly of a portable, standalone environment for our application instance

Question 2

Why use containers?

Answer 2

• Enforces all the dependencies our app requires
• Can create a standardized unit that can be deployed on many different platforms & systems
• Instances to be quickly booted up and shut down

Question 3

What are the differences between VM and Containers?

Answer 3

<b>VM</b>
Runs an entire guest OS, sandboxed from the underlying host OS and uses virtualization to provide ‘virtual resources’ for it

<b>Container</b>
Shares the underlying host OS (kernel of the host OS). The container engine is run directly on the host OS

Question 4

What are the pros of using Containers?

Answer 4

• Efficient
• Fast deployment
• More portable

Question 5

App Engine is built around what type of container?

Answer 5

Docker Containers

Question 6

What are the 2 environments offered by App Engine?

Answer 6

• Standard

- Flexible

Question 7

What can you do in a flexible environment?

Answer 7

• Import your own custom runtime using a Docker deployment

Question 8

What are the cons of using a flexible environment in App Engine?

Answer 8

• You can’t scale down to 0 instances
• Boot time of flexible instances is longer
• Pricing based on compute instance characteristics instead of instance hours

Question 9

Containers are in an awkward space between PaaS and IaaS. Why is that?

Answer 9

Can control dependencies (Including OS and underlying runtime)