Questions

Please answer the following questions to assess your learning progress:

1. Which statements are correct (multiple answers are possible)?

A. A container is kind of a lightweight VM
B. A container only runs on a Linux host
C. A container can only run one process
D. The main process in a container always has PID 1
E. A container is one or more processes encapsulated by Linux namespaces and restricted by cgroups

2. In your own words, maybe by using analogies, explain what a container is.
3. Why are containers considered to be a game-changer in IT? Name three or four reasons.
4. What does it mean when we claim: If a container runs on a given platform, then it runs anywhere...? Name two to three reasons why this is true.
5. Docker containers are only really useful for modern greenfield applications based on microservices. Please justify your answer.

A. True
B. False

6. How much does a typical enterprise save when containerizing its legacy applications?

A. 20%
B. 33%
C. 50%
D. 75%

7. Which two core concepts of Linux are containers based on?