Port mapping in Compose in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to expose port 80 on the container to port 8080 on the host.

Docker

ports:
  - "[1]:80"

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

A443

B80

C8080

D3000

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the host and container ports.

Using the container port alone without mapping.

The format for port mapping is host_port:container_port. Here, port 80 inside the container is mapped to port 8080 on the host.

2fill in blank

medium

Complete the code to map port 5432 inside the container to port 15432 on the host.

Docker

ports:
  - "[1]:5432"

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

A5432

B15432

C3306

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Using the container port as the host port.

Forgetting the colon separator.

Port 5432 is the container port (commonly for PostgreSQL). We map it to 15432 on the host to avoid conflicts.

3fill in blank

hard

Fix the error in the port mapping to correctly expose port 5000 on the container to port 5000 on the host.

Docker

ports:
  - "[1]5000"

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

A5000:

B5000

C5000-

D:5000

Attempts:

3 left

💡 Hint

Common Mistakes

Using a dash '-' instead of a colon ':'.

Omitting the host port.

The correct syntax for port mapping is host_port:container_port. The dash is incorrect here.

4fill in blank

hard

Fill both blanks to map port 8080 on the host to port 80 on the container and port 8443 on the host to port 443 on the container.

Docker

ports:
  - "[1]:80"
  - "[2]:443"

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

A8080

B80

C8443

D443

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping host and container ports.

Using container ports on the left side.

The first line maps host port 8080 to container port 80. The second line maps host port 8443 to container port 443.

5fill in blank

hard

Fill all three blanks to create a port mapping in Compose that exposes port 3000 on the host to port 3000 on the container, and port 5000 on the host to port 5000 on the container, and port 8000 on the host to port 80 on the container.

Docker

ports:
  - "[1]:3000"
  - "[2]:5000"
  - "[3]:80"

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

A3000

B5000

C8000

D80

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up host and container ports.

Using container ports on the left side.

The first two lines map the same host and container ports (3000 and 5000). The last line maps host port 8000 to container port 80.