Service scaling in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to scale the service named webapp to 3 replicas.

Docker

docker service scale webapp=[1]

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

A4

B2

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number less than 1, which stops the service.

Forgetting the equal sign.

The command docker service scale webapp=3 sets the number of replicas of the webapp service to 3.

2fill in blank

medium

Complete the command to list all running services and their replicas.

Docker

docker service [1]

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

Als

Bps

Clist

Dshow

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ps' which shows tasks, not services.

Using 'show' which is not a valid docker service command.

The command docker service ls lists all services with their current replicas and status.

3fill in blank

hard

Fix the error in the command to scale the service api to 5 replicas.

Docker

docker service scale [1]=5

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

Aservice-api

Bapi

Capi-service

Dapis

Attempts:

3 left

💡 Hint

Common Mistakes

Adding extra words to the service name.

Using plural or hyphenated names incorrectly.

The service name must match exactly. Here, the service is named api, so the correct command is docker service scale api=5.

4fill in blank

hard

Fill both blanks to create a command that updates the frontend service to have 4 replicas.

Docker

docker service update --replicas [1] [2]

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

A4

Bfrontend

Cwebapp

D--force

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong service name.

Putting the service name before the replicas number.

The command docker service update --replicas 4 frontend updates the frontend service to 4 replicas. The --force flag is optional here.

5fill in blank

hard

Fill all three blanks to write a command that forces update on the backend service and scales it to 6 replicas.

Docker

docker service update [1] [2] [3]

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

A--force

B--replicas

C6

Dbackend

Efrontend

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing service names.

Forgetting the --force flag.

The command docker service update --force --replicas 6 backend forces an update on the backend service and scales it to 6 replicas.