Creating custom bridge networks in Docker - Quick Revision & Summary

Recall & Review

beginner

What is a custom bridge network in Docker?

A custom bridge network is a user-defined network that allows Docker containers to communicate with each other on the same host with isolated network settings.

beginner

Which Docker command creates a custom bridge network named 'my_bridge'?

docker network create --driver bridge my_bridge

intermediate

Why use a custom bridge network instead of the default bridge network?

Custom bridge networks provide better isolation, allow container name resolution, and enable easier management of container communication.

beginner

How do containers communicate on a custom bridge network?

Containers on the same custom bridge network can communicate using container names as hostnames, simplifying service discovery.

intermediate

What happens if you try to connect a container to a non-existent custom bridge network?

Docker will return an error saying the network does not exist, and the container will not start or connect until the network is created.

Which command creates a custom bridge network in Docker?

A docker create network bridge my_network

B docker network create --driver bridge my_network

C docker network new bridge my_network

D docker bridge create my_network

The correct syntax to create a custom bridge network is 'docker network create --driver bridge '.

What is the default driver used when creating a custom bridge network?

A none

B overlay

C host

D bridge

The 'bridge' driver is the default for custom bridge networks in Docker.

How can containers on a custom bridge network communicate with each other?

A Only through published ports

B Using container IP addresses only

C Using container names as hostnames

D They cannot communicate

Containers on the same custom bridge network can use container names as hostnames to communicate.

What command lists all Docker networks including custom bridge networks?

A docker network ls

B docker network show

C docker network list all

D docker networks

'docker network ls' lists all Docker networks on the host.

What happens if you remove a custom bridge network while containers are connected to it?

A Containers lose network connectivity and may stop

B Docker automatically reconnects containers to default network

C Nothing happens

D Containers keep running and stay connected

Removing a custom bridge network disconnects containers, causing network loss and possible container failure.

Explain how to create and use a custom bridge network in Docker.

Think about the command to create the network and how containers talk to each other on it.

Describe the benefits of using a custom bridge network over the default Docker bridge network.

Consider what problems the default network might have that a custom one solves.