Overlay networks in Swarm in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to create an overlay network named 'mynetwork' in Docker Swarm.

Docker

docker network create -d [1] mynetwork

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

Abridge

Boverlay

Chost

Dmacvlan

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bridge' driver which only works on a single host.

Using 'host' which shares the host network stack.

Using 'macvlan' which is for direct host network access.

The overlay driver is used to create networks that span multiple Docker hosts in a Swarm cluster.

2fill in blank

medium

Complete the command to attach a service named 'web' to the overlay network 'mynetwork'.

Docker

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

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

Ahost

Bbridge

Cdefault

Dmynetwork

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bridge' which is not the overlay network.

Using 'host' which bypasses Docker networking.

Using 'default' which may not exist or be overlay.

The service must be attached to the overlay network mynetwork to communicate across Swarm nodes.

3fill in blank

hard

Fix the error in the command to inspect the overlay network named 'mynetwork'.

Docker

docker network [1] mynetwork

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

Ainspect

Bcreate

Crm

Dlist

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'list' which shows all networks but not details.

Using 'create' which tries to make a new network.

Using 'rm' which deletes the network.

The inspect command shows detailed information about a specific network.

4fill in blank

hard

Fill both blanks to create an overlay network with encryption enabled and attach it to a service named 'db'.

Docker

docker network create -d [1] --opt encrypted=[2] secure_net && docker service create --name db --network secure_net postgres

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

Aoverlay

Btrue

Cfalse

Dbridge

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bridge' driver which does not support encryption in Swarm.

Setting encrypted option to 'false' which disables encryption.

Overlay networks support encryption with the --opt encrypted=true option. The driver must be 'overlay'.

5fill in blank

hard

Fill all three blanks to create a service named 'app' attached to two overlay networks 'frontend' and 'backend'.

Docker

docker network create -d [1] frontend && docker network create -d [2] backend && docker service create --name app --network [3] nginx

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

Aoverlay

Bbridge

Cfrontend

Dbackend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bridge' driver which is not for Swarm overlay networks.

Confusing network names in the service command.

Both networks must use the 'overlay' driver. The service is attached to the 'frontend' network first.