Container orchestration in production in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all running Docker containers.

Docker

docker [1]

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

Aps

Brun

Cstart

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'docker run' instead of 'docker ps' to list containers.

Using 'docker start' which starts a stopped container but does not list them.

The docker ps command lists all running containers.

2fill in blank

medium

Complete the command to create a Docker Swarm cluster on the current machine.

Docker

docker swarm [1]

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

Ajoin

Binit

Cleave

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'join' which is for adding nodes to an existing swarm.

Using 'leave' which removes a node from a swarm.

The docker swarm init command initializes a new swarm cluster on the current machine.

3fill in blank

hard

Fix the error in the command to deploy a service named 'web' with 3 replicas.

Docker

docker service create --name web --replicas [1] nginx

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

A3

B-3

Ctwo

Dzero

Attempts:

3 left

💡 Hint

Common Mistakes

Using words like 'two' or 'zero' instead of numbers.

Using negative numbers like '-3' which are invalid.

The replicas option requires a positive integer. '3' is correct.

4fill in blank

hard

Fill both blanks to create a Docker Compose file snippet that defines a service named 'app' using the image 'myapp:latest'.

Docker

services:
  app:
    image: [1]
    [2]: 80

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

Amyapp:latest

Bports

Cvolumes

Denvironment

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'volumes' or 'environment' instead of 'ports' to expose ports.

Incorrect image name or format.

The image is 'myapp:latest' and 'ports' maps container port 80 to the host.

5fill in blank

hard

Fill all three blanks to write a Docker command that updates the 'web' service to use 5 replicas and the image 'nginx:stable'.

Docker

docker service update --replicas [1] --image [2] [3]

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

Aweb

Bnginx:stable

C5

Dmyapp

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of arguments.

Using wrong image or service names.

Set replicas to 5, image to 'nginx:stable', and specify the service name 'web'.