Question-21: What is the use of container configuration files?

Answer: Container configuration files are always available with the container and they provides instructions on how to setup the container environment and execute the application entry point. Which has information like

• How to setup Networking
• How to setup namespace isolation
• How to setup resource constraints like (cgroups)
• What should be the syscall restrictions should be placed on a running container instance.

Both Container root filesystem and configuration files are typically bundled using the Docker image format.

Question-22: What are the main categories of the containers?

Answer: Containers fall into two categories as below

• System Containers
• Application Containers

Question-23: What do you mean by System Containers?

Answer: You can assume System Containers are somewhat similar to virtual machines and often run a full boot process. And often includes the system services like ssh, cron, syslog etc. However, it is avoided to create system containers now a days.

Question-24: What is application Containers?

Answer: Application containers are different from System containers and they usually run single programs. And provides the granularity for creating scalable applications.

Question-25: Now can you further add detail, what is Kubernetes?

Answer: Yes, now we can say that Kubernetes are more of building and deploying distributed system which is made up using application containers.