Networking

Question 1

What are the 5 different network drivers?

Answer 1

1. Bridge
2. Host
3. Overlay
4. MACVLAN
5. None

Question 2

What are the 5 attributes of the Container Networking Model (CNM)?

Answer 2

1. Sandbox
2. Endpoint
3. Network
4. Network Drivers
5. IPAM Drivers

Question 3

What is the default network driver used when creating a container without specifying?

Answer 3

bridge network

Question 4

Command to create a user defined bridge network?

Answer 4

docker network create –driver bridge mybridge

Question 5

How to run a docker container in a specific network?

Answer 5

docker run –name mycontainer –network mybridge ubuntu

Question 6

Name 4 differences between user defined and the default bridge network?

Answer 6

1. User defines allows for embedded DNS for other containers on same bridge using container names
2. User defined provides better isolation
3. Containers can be attached/detached without stopping them on user defined bridge
4. User defined bridges are configured inside docker, default bridge is not.

Question 7

What is the main characteristic of the Host network driver?

Answer 7

Ports are opened directly from the host to the container. Ports do not need to be published

Question 8

What is a use case for using the Host network?

Answer 8

Running a container which monitors the hosts eth0 interface

Question 9

What network access does the None network driver have?

Answer 9

No access to/from the host or to/from other containers

Question 10

How to publish all ports of a container to the host with the run command?

Answer 10

Use -P (–publish-all)

Question 11

What is the legacy approach for linking containers?

Answer 11

docker run –name my_ubuntu –link source_container:alias_for_container ubuntu

Question 12

How to encrypt an overlay network upon creation?

Answer 12

docker network create –opt encrypted –driver overlay my_network

Question 13

How does docker encrypt overlay networks?

Answer 13

IPSEC tunnels between nodes