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.
Create the
prices-overlay-netoverlay network.docker network create --driver overlay prices-overlay-net
- Create the base-price service.
Create the
base-priceservice.docker service create --name base-price --network prices-overlay-net --replicas 3 linuxacademycontent/prices-base-price:1
- Create the sales service.
Create the
salesservice.docker service create --name sales --network prices-overlay-net --replicas 3 linuxacademycontent/prices-sales:1
- Create the total-price service.
Create the
total-priceservice.docker service create --name total-price --network prices-overlay-net --replicas 2 -p 8080:80 linuxacademycontent/prices-total-price:1Verify that you get the total price data.
curl localhost:8080You should see a list of products and the total price for each. These prices are calculated by communicating with the
base-priceandsalesservices using the custom overlay network.
