Alert setup for container health in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Docker healthcheck command to check if the container is healthy.

Docker

HEALTHCHECK CMD curl -f http://localhost[1] || exit 1

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

A:80/health

B:8080/health

C:443/health

D:3000/health

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port number

Missing colon before port

Incorrect endpoint path

The healthcheck uses port 80 by default to check the /health endpoint.

2fill in blank

medium

Complete the Docker Compose healthcheck interval setting to run every 30 seconds.

Docker

healthcheck:
  test: ["CMD", "curl", "-f", "http://localhost/health"]
  interval: [1]

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

A10s

B30s

C1m

D5s

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong time format

Too short or too long interval

Missing 's' suffix

The interval setting defines how often the healthcheck runs. 30s means every 30 seconds.

3fill in blank

hard

Fix the error in the healthcheck test command to correctly check container health.

Docker

healthcheck:
  test: [1]

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

A"CMD curl -f http://localhost/health"

B"curl -f http://localhost/health"

C["curl", "-f", "http://localhost/health"]

D["CMD", "curl", "-f", "http://localhost/health"]

Attempts:

3 left

💡 Hint

Common Mistakes

Using string instead of array

Missing "CMD" keyword

Incorrect array format

The test command must be an array starting with "CMD" followed by the command and arguments.

4fill in blank

hard

Fill both blanks to set the healthcheck retries and timeout values.

Docker

healthcheck:
  retries: [1]
  timeout: [2]

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

A3

B5

C30s

D10s

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping retries and timeout values

Using string for retries

Wrong time format

Retries is the number of attempts before marking unhealthy. Timeout is how long to wait for each check.

5fill in blank

hard

Fill all three blanks to create a healthcheck that runs every 20 seconds, retries 4 times, and has a timeout of 15 seconds.

Docker

healthcheck:
  interval: [1]
  retries: [2]
  timeout: [3]

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

A20s

B4

C15s

D10s

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up retries and timeout

Using wrong time units

Missing 's' in time values

The interval is how often to run the check, retries is how many times to retry, and timeout is how long to wait for each check.