Network inspection and debugging in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What command shows all Docker networks on your system?

Use docker network ls to list all Docker networks available on your system.

beginner

How do you inspect detailed information about a specific Docker network?

Use docker network inspect <network_name_or_id> to see detailed info like connected containers and IP ranges.

intermediate

Which command helps you see the IP address of a running Docker container?

Run docker inspect -f '{{ .NetworkSettings.Networks.<network>.IPAddress }}' <container_name_or_id> to get the container's IP address.

intermediate

How can you test network connectivity between Docker containers?

You can use docker exec <container> ping <other_container_ip_or_name> to check if one container can reach another.

intermediate

What is the purpose of the docker network disconnect command?

It disconnects a container from a Docker network, useful for isolating containers during debugging.

Which command lists all Docker networks?

A docker network create

B docker network ls

C docker network connect

D docker network inspect

docker network ls lists all networks. The others create, inspect, or connect networks.

How do you find the IP address of a running container?

A docker inspect -f '{{ .NetworkSettings.IPAddress }}' <container>

B docker network ls

C docker ps

D docker logs <container>

Use docker inspect with a format option to get the container's IP address.

What command helps you check if one container can reach another?

A docker exec <container> ping <target_ip>

B docker network ls

C docker network disconnect

D docker stop <container>

Using ping inside a container tests network connectivity to another container.

Which command disconnects a container from a network?

A docker network connect

B docker network inspect

C docker network disconnect

D docker network ls

docker network disconnect removes a container from a network.

What does docker network inspect show?

A Logs of network activity

B List of all networks

C Create a new network

D Detailed info about a network including connected containers

This command shows detailed network info like connected containers and IP ranges.

Explain how to inspect and find the IP address of a Docker container.

Think about how to get detailed info about a container's network settings.

Describe steps to test network connectivity between two Docker containers.

Imagine you want to check if one friend can call another using their phone number.