docker-compose for services in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the Docker image for the service.

Spring Boot

services:
  app:
    image: [1]

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

Abuild

Bdockerfile

Cmy-springboot-app:latest

Dcontainer_name

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'build' or 'dockerfile' instead of 'image' to specify the image name.

Leaving the image name empty or incorrect.

The image key specifies the Docker image to use for the service.

2fill in blank

medium

Complete the code to expose port 8080 from the container to the host.

Spring Boot

services:
  app:
    ports:
      - "[1]:8080"

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

A80

B443

C3000

D8080

Attempts:

3 left

💡 Hint

Common Mistakes

Using a port different from 8080 on the container side.

Swapping the ports in the mapping.

The format hostPort:containerPort maps the container's port 8080 to the host's port 8080.

3fill in blank

hard

Fix the error in the volume mapping to persist data.

Spring Boot

services:
  db:
    volumes:
      - [1]:/var/lib/postgresql/data

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

A/var/data

B./data

Cdata

D/data

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'data' without './' which Docker Compose treats differently.

Using an absolute path that does not exist on the host.

Using ./data maps a local folder to the container's data folder, persisting data.

4fill in blank

hard

Fill both blanks to define environment variables for the database service.

Spring Boot

services:
  db:
    environment:
      - [1]=postgres
      - [2]=password123

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

APOSTGRES_USER

BPOSTGRES_PASSWORD

CDB_USER

DDB_PASS

Attempts:

3 left

💡 Hint

Common Mistakes

Using custom variable names instead of the expected ones.

Swapping user and password variable names.

These are the standard environment variables for PostgreSQL Docker images.

5fill in blank

hard

Fill all three blanks to define a build context, Dockerfile, and container name for the app service.

Spring Boot

services:
  app:
    build:
      context: [1]
      dockerfile: [2]
    container_name: [3]

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

A./app

BDockerfile

Cspringboot_app

D./src

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong folder paths for context.

Using incorrect Dockerfile names.

Not naming the container or using invalid names.

The context is the folder with the Dockerfile, dockerfile is the filename, and container_name names the container.