Docker Intermediate Quiz

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Test your knowledge on Docker networking, volumes, and composition.

Instructions:

• Select the best answer for each question.
• Your score will be shown at the end.

#

Which command is used to show container logs?

docker logs [container_id]

docker show [container_id]

docker output [container_id]

docker print [container_id]

docker logs fetches the logs of a container.

#

What is a Docker Volume used for?

Persisting data outside the container's lifecycle

Increasing container speed

Networking between containers

Reducing image size

Volumes are the preferred mechanism for persisting data generated by and used by Docker containers.

#

Which command is used to launch a multi-container application defined in a YAML file?

docker-compose up

docker run -all

docker start --compose

docker-stack deploy

docker-compose up builds, (re)creates, starts, and attaches to containers for a service defined in a docker-compose.yml.

#

Which Docker network driver is the default for containers?

bridge

host

overlay

none

bridge is the default network driver. If you don't specify a driver, this is the type of network you are building.

#

How do you execute a command inside a running container?

docker exec -it [container_id] [command]

docker run -it [container_id] [command]

docker enter [container_id]

docker attach [container_id]

docker exec runs a new command in a running container. -it allows interactive access.

#

Which command removes an image?

docker rmi

docker rm

docker delete image

docker prune image

docker rmi (or docker image rm) removes one or more images.

#

What is the purpose of .dockerignore file?

To exclude files/directories from the build context

To ignore errors during build

To hide passwords

To ignore docker commands

It excludes files and directories from the build context, similar to .gitignore.

#

Which flag maps a port from the container to the host?

-p

-P

-port

--map

-p (e.g., -p 8080:80) maps a Host port to a Container port.

#

What is a dangling image?

An image layer that has no relationship to any tagged image

A corrupt image

A stopped container

An image from a private registry

Dangling images are untagged images, often intermediate layers from old builds, displayed as <none>.

#

Which command creates a new volume?

docker volume create

docker create volume

docker add volume

docker new volume

`docker volume create` manually creates a named volume.

#

Which command builds an image from a Dockerfile in the current directory?

docker build -t my-image .

docker create -t my-image .

docker make -t my-image .

docker compile -t my-image .

docker build builds an image from a Dockerfile. The . specifies the build context (current directory).

#

What is the default name of the Docker configuration file that defines a multi-container application?

docker-compose.yml

Dockerfile

compose.json

docker-config.yaml

docker-compose.yml is the default file used by Docker Compose.

#

In Docker Compose, which keyword defines the dependencies between services?

depends_on

links

requires

after

depends_on expresses dependency order (start order).

#

Which network driver creates a distributed network among multiple Docker daemon hosts?

overlay

bridge

host

macvlan

The overlay network driver creates a distributed network among multiple Docker daemon hosts.

#

How can you isolate a container from the host network stack?

By default, it is isolated (bridge mode)

Use --network host

Use --isolation=hyperv

It's not possible

Containers are isolated by default using the bridge driver.

#

What command lists all networks?

docker network ls

docker list networks

docker network show

docker net list

docker network ls lists all networks.

#

How do you inspect a specific network?

docker network inspect [network-name]

docker inspect network [network-name]

docker show network [network-name]

docker network details [network-name]

docker network inspect provides detailed information about a network.

#

Which command removes all unused networks?

docker network prune

docker network clean

docker rm networks

docker clean networks

docker network prune removes all networks not used by at least one container.

#

What is a Bind Mount?

A file or directory on the host machine mounted into a container

A managed volume

A cloud storage mount

A temporary file system

Bind mounts map a host file or directory to a container path.

#

Which instruction in Dockerfile is used to copy files from the context to the image?

COPY

LOAD

MOVE

PASTE

COPY copies new files or directories from <src> and adds them to the filesystem of the container at the path <dest>.

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