Docker inspect for detailed info - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Inspecting container network settings

You run the command docker inspect my_container and want to find the IP address assigned to the container. Which command filters the IP address correctly?

A docker inspect -f '{{ .Config.IPAddress }}' my_container

B docker inspect -f '{{ .Network.IPAddress }}' my_container

C docker inspect -f '{{ .NetworkSettings.IPAddress }}' my_container

D docker inspect -f '{{ .HostConfig.IPAddress }}' my_container

💡 Hint

Look inside the NetworkSettings section for IP details.

The IP address of a Docker container is stored under NetworkSettings.IPAddress. The other options point to incorrect or non-existent fields.

💻 Command Output

intermediate

Finding container mount points

Which docker inspect command shows the source paths of volumes mounted inside a container named webapp?

A docker inspect -f '{{ range .Mounts }}{{ .Source }} {{ end }}' webapp

B docker inspect -f '{{ .Config.Mounts }}' webapp

C docker inspect -f '{{ .HostConfig.Binds }}' webapp

D docker inspect -f '{{ .Volumes }}' webapp

💡 Hint

Mount points are listed under the Mounts array.

The Mounts array contains details about volume mounts including their source paths. The other fields do not provide this information directly.

❓ Troubleshoot

advanced

Diagnosing missing environment variables

You inspect a container but notice the environment variables you set are missing. Which field in the docker inspect output should you check to verify environment variables?

A Config.Env

B HostConfig.Env

C NetworkSettings.Env

D Mounts.Env

💡 Hint

Environment variables are part of the container configuration.

Environment variables are stored in the Config.Env field. Other fields do not contain environment variable information.

🧠 Conceptual

advanced

Understanding Docker inspect output format

What is the default output format of the docker inspect command?

A Plain text summary

B JSON formatted detailed information

C YAML formatted data

D XML formatted data

💡 Hint

Think about the data format used for structured output in Docker CLI.

The default output of docker inspect is JSON, which provides detailed structured information about containers or images.

✅ Best Practice

expert

Efficiently extracting container creation time

You want to get only the creation time of a container named dbserver using docker inspect. Which command is the most efficient and correct?

A docker inspect -f '{{ .State.Created }}' dbserver

B docker inspect dbserver | grep Created

C docker inspect -f '{{ .Config.Created }}' dbserver

D docker inspect -f '{{ .Created }}' dbserver

💡 Hint

Creation time is a top-level field in the inspect JSON.

The Created field is at the top level of the inspect output. Using the Go template with -f flag to extract {{ .Created }} is efficient and precise.