Blue-green deployment with containers 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

Cimages

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'docker images' lists images, not containers.

Using 'docker run' starts a container, not lists them.

The docker ps command lists all running containers.

2fill in blank

medium

Complete the command to start a new container named 'green' from the image 'myapp:latest'.

Docker

docker run -d --name [1] myapp:latest

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

Ablue

Byellow

Cred

Dgreen

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the container 'blue' which is usually the old version.

Using unrelated names like 'red' or 'yellow'.

In blue-green deployment, the new version is often called 'green'.

3fill in blank

hard

Fix the error in the command to stop the 'blue' container.

Docker

docker [1] blue

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

Astop

Bstart

Crun

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'start' which runs a container.

Using 'run' which creates a new container.

The docker stop command stops a running container.

4fill in blank

hard

Fill both blanks to create a Docker network named 'blue-green-net' and connect the 'green' container to it.

Docker

docker network [1] blue-green-net
docker network [2] blue-green-net green

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

Acreate

Bremove

Cconnect

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove' or 'disconnect' which delete or detach networks or containers.

Trying to connect before creating the network.

First, create the network with docker network create. Then connect the container with docker network connect.

5fill in blank

hard

Fill all three blanks to update the load balancer to point to the 'green' container, stop the 'blue' container, and remove it.

Docker

docker service update --publish-add [1] my-loadbalancer
docker [2] blue
docker [3] blue

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

A80:80

Bstop

Crm

D8080:80

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong port mappings like 8080:80 if not intended.

Removing before stopping the container.

Publish port 80 to 80 on the load balancer, stop the old 'blue' container, then remove it.