Don't set hostname to service name when using --x-networking

[vieux]

Using the new networking features, when you start a container.
The name is correctly <folder>_<service>_1 but the hostname is <service>

It's impossible the scale the containers in some case because all the containers get the same hostname.

[vieux]

for example with:

$ cat docker-compose.yml
redis:
 container_name: redis
 image: redis
 command: redis-server

rqworker:
 image: vieux/rqworker
 command: -u redis://redis:6379/

rqdashboard:
 image: vieux/rq-dashboard
 command: -H redis
 ports:
  - 9181:9181

you cannot scale rqworker because the all end up with the hostname rqworker and it will fail.

[dnephin]

This is because of #2276. networking was supposed to use the hostname, but it didn't end up happening.

Can you tell me more about how it breaks? Isn't the hostname only internal to the container?

[vieux]

@dnephin it's an issue for me because rqworker advertises itself using it's hostname and rq refuses to have 2 workers with the same name.

Traceback (most recent call last):
  File "/usr/local/bin/rqworker", line 9, in <module>
    load_entry_point('rq==0.5.6', 'console_scripts', 'rqworker')()
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 700, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 680, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 873, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python2.7/dist-packages/click/core.py", line 508, in invoke
    return callback(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/rq/cli/cli.py", line 202, in worker
    w.work(burst=burst)
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 404, in work
    self.register_birth()
  File "/usr/local/lib/python2.7/dist-packages/rq/worker.py", line 238, in register_birth
    raise ValueError(msg.format(self.name))
ValueError: There exists an active worker named u'rqworker.1' already

[vieux]

@dnephin is there a way to hack the compose file to use

hostname: rqworker_{$COUNT}

[dnephin]

There is not. We'll have to fix this for 1.5.1