Add support for log-driver as a docker-compose.yml option

[vdemeester]

Discussed in #1303, as docker-py version 1.2.1 support this, we can add it as an option for docker-compose.yml files.

It's kept simple for now, the config files would look like :

web1:
    image: busybox
    log_driver: syslog
web2:
    image: busybox
    log_driver: json-file
web3:
    image: busybox
    log_driver: none

The choice of log_driver is to keep it coherent with the --log-driver option of docker run (even though it's LogConfig in the API).

Signed-off-by: Vincent Demeester vincent@sbr.pm

[aanand]

This reads a bit confusingly. How about:

Specify a logging driver for the service's containers, as with the --log-driver option for docker run (documented here).

Allowed values are currently json-file, syslog and none. The list will change over time as more drivers are added to the Docker engine.

The default value is json-file.

[aanand]

The header for this section should read "log_driver" too.

[vdemeester]

Yeah, sounds way better :) I'll update it according to it.

[aanand]

Thanks! Minor documentation comments; otherwise, looks great.

[vdemeester]

@aanand took care of your comments ;)

[aanand]

Thanks!

LGTM

[dnephin]

LGTM

[nick-allen]

Is extends going to acknowledge the log_driver setting?

[aanand]

@nick-allen log_driver should get passed through when you extend a service, yes.

[brancz]

From what I can tell, this does not cover setting --log-opt correct? Are there plans to allow doing so?
//edit just found #1648 which adds it and it will be available in 1.4.0

[vdemeester]

@flower-pot it's probably already there #1665 (for the next release 1.4.0)