Deploying a Service on an Overlay Network

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Deploying a Service on an Overlay Network

Bridge networks are a powerful tool for controlling communication between containers on a single host, but what if you need to provide isolated networking between containers in Docker Swarm? With Docker Swarm, you can use custom overlay networks to allow groups of containers to communicate transparently, even if they are running on different swarm nodes. In this lab, you will have the opportunity to work with overlay networks. You will set up a custom overlay network and deploy three different services that communicate with each other using this network.

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Lab Info

Level

Intermediate

Last updated

Aug 31, 2025

Duration

30m

Challenge

Create the overlay network.
1. Create the prices-overlay-net overlay network.
```
docker network create --driver overlay prices-overlay-net
```

Challenge

Create the base-price service.

Create the base-price service.

docker service create --name base-price --network prices-overlay-net --replicas 3 linuxacademycontent/prices-base-price:1

Challenge

Create the sales service.

Create the sales service.

docker service create --name sales --network prices-overlay-net --replicas 3 linuxacademycontent/prices-sales:1

Challenge

Create the total-price service.
1. Create the total-price service.
```
docker service create --name total-price --network prices-overlay-net --replicas 2 -p 8080:80 linuxacademycontent/prices-total-price:1
```
1. Verify that you get the total price data.
```
curl localhost:8080
```
You should see a list of products and the total price for each. These prices are calculated by communicating with the base-price and sales services using the custom overlay network.

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