Why data persistence matters in Docker - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run a Docker container that keeps data after it stops.

Docker

docker run -d --name mycontainer -v [1]:/data busybox

Drag options to blanks, or click blank then click option'

A/host/data

B/container/data

C/tmp

D/var/log

Attempts:

3 left

💡 Hint

Common Mistakes

Using a container path instead of a host path for volume mapping.

The -v option maps a host folder to the container to keep data persistent.

2fill in blank

medium

Complete the command to create a named Docker volume called 'myvol'.

Docker

docker volume [1] myvol

Drag options to blanks, or click blank then click option'

Acreate

Blist

Cinspect

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' or 'list' instead of 'create'.

The create command makes a new named volume in Docker.

3fill in blank

hard

Fix the error in the Docker run command to properly mount a volume named 'myvol' to '/app/data'.

Docker

docker run -d --name appcontainer -v [1]:/app/data busybox

Drag options to blanks, or click blank then click option'

Avolumes/myvol

Bvolume:myvol

Cmyvol

D/myvol

Attempts:

3 left

💡 Hint

Common Mistakes

Adding slashes or prefixes to the volume name.

To mount a named volume, just use its name without slashes or prefixes.

4fill in blank

hard

Fill both blanks to create a Docker volume and run a container using it.

Docker

docker volume [1] mydata && docker run -d -v [2]:/data alpine

Drag options to blanks, or click blank then click option'

Acreate

Bmydata

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' instead of 'create' or wrong volume name.

First, create the volume with create. Then use the volume name mydata to mount it.

5fill in blank

hard

Fill all three blanks to define a Docker Compose service with a volume for data persistence.

Docker

services:
  db:
    image: postgres
    volumes:
      - [1]:[2]
volumes:
  [3]:

Drag options to blanks, or click blank then click option'

Adbdata

B/var/lib/postgresql/data

Dmyvolume

Attempts:

3 left

💡 Hint

Common Mistakes

Using different volume names or wrong container paths.

The volume name dbdata is used in both service and volumes sections. The container path is /var/lib/postgresql/data.