Deploying a Service on an Overlay Network

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30 minutes
  • 4 Learning Objectives

About this Hands-on Lab

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.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Create the overlay network.
  1. Create the prices-overlay-net overlay network.

    docker network create --driver overlay prices-overlay-net
Create the base-price service.
  1. Create the base-price service.

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

    docker service create --name sales --network prices-overlay-net --replicas 3 linuxacademycontent/prices-sales:1
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
  2. 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.

Additional Resources

Your fruit stand company has some software that calculates and serves a list of products and their prices, taking into account items that are on sale and how the sales affect the total price. This software consists of three components: a base-price component which serves the base prices of fruits sold by the fruit stand, a sales component which provides a list of items that are on sale and how much each item is discounted, and a total-price component which communicates with the other two and calculates the final price for each item.

These components have been running on a single Docker host, but as your business is expanding, it is time to upgrade to a swarm cluster for greater flexibility. Run these three application components as services in your swarm cluster, and provide them with a custom overlay network to facilitate isolated communication between them.

Configure these application components on the Swarm cluster so that the following specifications are met:

  • Create an overlay network called prices-overlay-net.
  • Create a service called base-price with 3 replicas using the linuxacademycontent/prices-base-price:1 image. Configure the service to use the prices-overlay-net network.
  • Create a service called sales with 3 replicas using the linuxacademycontent/prices-sales:1 image. Configure the service to use the prices-overlay-net network.
  • Create a service called total-price with 2 replicas using the linuxacademycontent/prices-total-price:1 image. Configure the service to use the prices-overlay-net network. Expose this service's port 80 on port 8080.

If everything is set up correctly, you should be able to access the total prices list with curl localhost:8080.

If you get stuck, feel free to check out the solution video, or the detailed instructions under each objective. Good luck!

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