Ceph

When managing large systems via Puppet or some other configuration tool it could be very useful to have "snippet" configuration (That's how I call it) support in ceph.conf

Not all nodes in a large cluster need the [osd] section since they are for example clients, but they do need the [mon] section.

A sample configuration like this would be very useful:

ceph.conf

[global]
    ms bind ipv6 = true

include /etc/ceph/ceph.mon.conf
include /etc/ceph/ceph.osd.conf

ceph.mon.conf

[mon]
    mon data = /path/to/mon/$id

[mon.a]
    host = monitor-a
    mon addr = 192.168.0.1:6789

[mon.b]
    host = monitor-b
    mon addr = 192.168.0.2:6789

[mon.c]
    host = monitor-c
    mon addr = 192.168.0.3:6789

ceph.osd.conf

[osd]
    osd data = /path/to/osd/$id

[osd.0]
    host = node01

[osd.1]
    host = node02

[osd.2]
    host = node03

[osd.3]
    host = node04

The config parser would include all this configuration and then parse it like it was one big configuration.

When a file does not exist when including we can by default throw a error, but if "ignore missing include" is set to true, it won't complain.

I think this could be very benificial for large setups with a large amount of clients. You can still keep one central place for your configuration and only distribute to clients what's required there.