Adding a hostname to a service in Docker-Compose
Every service container in Docker joins the default network. Other containers on that network can access it, and they can discover it using the hostname that is the same as the container name.
This article will discuss adding hostnames to our container services in docker-compose.
Adding a hostname to a service in Docker-Compose
As of docker-compose version 3.0, we can use the hostname key and add it to our YAML file. Make sure we have explicitly defined the version that docker-compose should use when running our services.
To determine the version, use the version key with a value of 3 or 3.0.
version: "3.0"
services:
sampleservice:
hostname: service-hostname
Without a version key, docker-compose will use the defaults of version 1 when running the service. With version 1, we will not set the hostname correctly.
However, there is a known issue where docker runthe hostname will not be visible to other containers if we execute the command. We can define an alias and assign a name to the container as a workaround.
To define an alias, first enable the defined alias by running the following command.
$ docker-compose run --use-aliases
Once this is running, we can use the alias key and include it in our YAML files.
version: "3.0"
services:
sampleservice:
networks:
samplenetwork:
aliases:
- alias1
- alias2
After that, manually assign the alias to the service using the following command.
$ docker-compose run --name alias1 sampleservice
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