Port mapping with -p flag in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to map port 8080 on the host to port 80 in the container.

Docker

docker run -d [1] nginx

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

A-P 8080:80

B-e 8080:80

C-p 8080:80

D-v 8080:80

Attempts:

3 left

💡 Hint

Common Mistakes

Using -v which is for volumes, not ports.

Using uppercase -P which maps random ports, not specific ones.

The -p flag maps a specific host port to a container port. Here, -p 8080:80 maps host port 8080 to container port 80.

2fill in blank

medium

Complete the command to map host port 5000 to container port 5000.

Docker

docker run -d [1] myapp

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

A-P

B-v 5000:5000

C-e 5000:5000

D-p 5000:5000

Attempts:

3 left

💡 Hint

Common Mistakes

Using -P which maps random ports instead of specific ones.

Using -v which is for volumes, not ports.

The -p 5000:5000 flag maps host port 5000 to container port 5000 explicitly.

3fill in blank

hard

Fix the error in the command to map host port 3000 to container port 3000.

Docker

docker run -d [1] 3000:3000 myapp

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

A-p

B-P

C-v

D-e

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase -P which maps random ports.

Using -v which is for volumes.

Not adding a space after the flag.

The correct flag to map ports is -p. It must be followed by a space before the port mapping.

4fill in blank

hard

Fill both blanks to map host port 8081 to container port 80 and host port 443 to container port 443.

Docker

docker run -d [1] [2] nginx

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

A-p 8081:80

B-v 8081:80

C-p 443:443

D-e 443:443

Attempts:

3 left

💡 Hint

Common Mistakes

Using -v or -e flags which are not for port mapping.

Using only one -p flag for multiple ports without repeating.

Use -p flag twice to map multiple ports: -p 8081:80 and -p 443:443.

5fill in blank

hard

Fill all three blanks to run a container mapping host ports 5000 and 6000 to container ports 5000 and 6000, and set environment variable ENV=prod.

Docker

docker run -d [1] [2] [3] ENV=prod myapp

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

A-p 5000:5000

B-p 6000:6000

C-e

D-v

Attempts:

3 left

💡 Hint

Common Mistakes

Using -v instead of -p for ports.

Not using -e for environment variables.

Trying to map multiple ports with one -p flag.

Use -p twice for port mappings and -e to set environment variables.