docker-compose.yml structure - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the version of the docker-compose file.

Docker

version: '[1]'

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A3.8

Bv3

C3

Dversion3

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'v3' or 'version3' instead of just the version number.

Leaving the version field empty.

The version field in docker-compose.yml specifies the file format version. '3.8' is a common and valid version string.

2fill in blank

medium

Complete the code to define the services section in docker-compose.yml.

Docker

services:
  [1]:

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Acontainers

Bservices

Cweb

Dapps

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'containers' or 'services' as a service name.

Using plural names which are not typical.

The services section lists service names. 'web' is a typical service name example.

3fill in blank

hard

Fix the error in the service definition to specify the image to use.

Docker

services:
  app:
    image: [1]

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Amyapp/latest

Bmyapp:latest

Cmyapp_latest

Dmyapp latest

Attempts:

3 left

💡 Hint

Common Mistakes

Using slash '/' instead of colon ':' to separate image and tag.

Using spaces in the image name.

The image field requires the image name and tag separated by a colon, like 'myapp:latest'.

4fill in blank

hard

Fill both blanks to define ports mapping and restart policy.

Docker

services:
  db:
    ports:
      - '[1]:5432'
    restart: [2]

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A5433

Balways

Cnever

D5432

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same port number for host and container without reason.

Using invalid restart policy values.

The port mapping maps host port 5433 to container port 5432. The restart policy 'always' restarts the container automatically.

5fill in blank

hard

Fill all three blanks to define environment variables, volumes, and command for a service.

Docker

services:
  redis:
    environment:
      - REDIS_PASSWORD=[1]
    volumes:
      - [2]:/data
    command: [3]

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

Amysecret

B./redisdata

C"redis-server --requirepass mysecret"

Dredisdata

Attempts:

3 left

💡 Hint

Common Mistakes

Putting quotes around environment variable values incorrectly.

Using relative paths incorrectly in volumes.

Not quoting the command string properly.

Environment variable sets the password. Volume maps local './redisdata' to container '/data'. Command runs redis-server with password.