Deploying services in Swarm in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to initialize a Docker Swarm on the current node.

Docker

docker swarm [1]

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

Acreate

Bstart

Claunch

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' instead of 'init' which is not a valid swarm command.

Using 'create' or 'launch' which are not Docker swarm commands.

The docker swarm init command initializes the current node as a Swarm manager.

2fill in blank

medium

Complete the command to deploy a service named 'web' using the nginx image.

Docker

docker service [1] --name web nginx

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

Acreate

Bdeploy

Cstart

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'deploy' which is not a valid Docker service command.

Using 'run' which is for containers, not services.

The docker service create command deploys a new service in the swarm.

3fill in blank

hard

Fix the error in the command to scale the 'web' service to 3 replicas.

Docker

docker service scale web=[1]

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

Areplica=3

B3

Cscale=3

Dreplicas=3

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'replicas=' or 'scale=' which causes syntax errors.

Using singular 'replica=3' which is incorrect.

The correct syntax is docker service scale web=3 to set the number of replicas.

4fill in blank

hard

Fill both blanks to update the 'web' service image to 'nginx:alpine' and force the update.

Docker

docker service update --image [1] --force [2]

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

Anginx:alpine

Bweb

Cnginx

Dservice

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'nginx' without the tag which updates to the latest image, not alpine.

Using 'service' instead of the actual service name.

The --image option specifies the new image, and the service name 'web' is required to update it.

5fill in blank

hard

Fill all three blanks to create a replicated service named 'db' with 2 replicas using the 'mysql:5.7' image.

Docker

docker service create --name [1] --replicas [2] [3]

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

Adb

B2

Cmysql:5.7

Dmysql

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mysql' without the version tag which may cause version mismatch.

Confusing the order of options or missing the service name.

The service name is 'db', replicas count is 2, and the image is 'mysql:5.7' for this service.