Docker container hostname with docker-compose

Question

I have multiple services running each a mysql database. I'm using docker-compose to deploy my apps in docker. I need that all these services are in the same network. I use different docker-compose file for each service.

My issue is: How can I prevent to container from being named the same (in docker dns) if they have the same name in different compose files.

Exemple:

service1.yml

version: '2'
services:
  mysql:
    image: "mysql"
    network:
      - anetwork
[...]

service2.yml

version: '2'
services:
  mysql:
    image: "mysql"
    network:
      - anetwork
[...]

This two files are in separate folders. After launching all docker-compose up. The containers appears with docker ps. On named service1_mysql_1 and the other service2_mysql_1. But when I ping mysql dns name inside the network anetwork, both responds...

How should I fix this ? I am using bad practices ?

I have already tried: - Changing the name in each compose files

How are you running the ping command? From inside a third container? If so, is it defined in service1.yml, service2.yml or elsewhere? — codemonkey
– codemonkey, Commented Mar 31, 2018 at 20:20

codemonkey · Accepted Answer · 2018-03-31 21:22:39Z

1

I think that the options are either:

Change the name to be different in each compose file, which I understand you have already tried, e.g:
```
version: '2'
services:
  mysql1:
    image: "mysql"
[...]
```
Use a fully-qualified name when connecting to each container, i.e. service1_mysql_1 and service2_mysql_1 in this case. Not ideal as it is generated but this name can be fixed by setting it explicitly using the container_name option:
```
version: '2'
services:
  mysql:
    image: "mysql"
    container_name: my-service1-mysql
[...]
```
Then a container that needs to connect to this database on the anetwork can connect using the hostname my-service1-mysql

answered Mar 31, 2018 at 21:22

codemonkey

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