CPU limits and reservations in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to set a CPU limit of 0.5 cores for a Docker container.

Docker

docker run --cpus=[1] nginx

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

A0.5

B1

C2

D0.1

Attempts:

3 left

💡 Hint

Common Mistakes

Using an integer like 1 which allows full CPU usage.

Using a value greater than the available CPU cores.

The --cpus flag sets the maximum number of CPUs the container can use. Here, 0.5 means half a CPU core.

2fill in blank

medium

Complete the command to reserve 0.25 CPU cores for a Docker container.

Docker

docker run --cpu-reservation=[1] nginx

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

A1

B2

C0.25

D0.5

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing CPU limit with CPU reservation.

Using a value larger than the CPU limit.

The --cpu-reservation flag reserves CPU resources for the container. 0.25 means reserving a quarter of a CPU core.

3fill in blank

hard

Fix the error in the command to limit CPU usage to 1.5 cores.

Docker

docker run --cpus=[1] nginx

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

A1.5

B1,5

C1-5

D15

Attempts:

3 left

💡 Hint

Common Mistakes

Using a comma instead of a dot for decimals.

Using a dash or other invalid characters.

The CPU limit must be a decimal number with a dot, not a comma or other separator. So 1.5 is correct.

4fill in blank

hard

Fill both blanks to set a CPU limit of 2 cores and reserve 1 core for a Docker container.

Docker

docker run --cpus=[1] --cpu-reservation=[2] nginx

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

A2

B1

C0.5

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Setting reservation higher than the limit.

Using fractional values when whole cores are intended.

The --cpus flag sets the max CPU usage to 2 cores, and --cpu-reservation reserves 1 core for the container.

5fill in blank

hard

Fill all three blanks to run a container with CPU limit 1.2, CPU reservation 0.8, and name it 'webapp'.

Docker

docker run --cpus=[1] --cpu-reservation=[2] --name=[3] nginx

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

A1.2

B0.8

Cwebapp

Dnginx

Attempts:

3 left

💡 Hint

Common Mistakes

Using the image name as the container name.

Mixing up CPU limit and reservation values.

The command sets CPU limit to 1.2 cores, reserves 0.8 cores, and names the container 'webapp'.