RFC: tool for applying 'ceph daemon <osd>' command to all OSDs

[Dan Mick <dmick@redhat.com>]

I needed something to fetch current config values from all OSDs (sorta
the opposite of 'injectargs --key value), so I hacked it, and then
spiffed it up a bit.  Does this seem like something that would be useful
in this form in the upstream Ceph, or does anyone have any thoughts on
its design or structure?

It requires a locally-installed ceph CLI and a ceph.conf that points to
the cluster and any required keyrings.  You can also provide it with
a YAML file mapping host to osds if you want to save time collecting
that info for a statically-defined cluster, or if you want just a subset
of OSDs.

https://github.com/dmick/tools/blob/master/osd_daemon_cmd.py

Excerpt from usage:

Execute a Ceph osd daemon command on every OSD in a cluster with
one connection to each OSD host.

Usage:
    osd_daemon_cmd [-c CONF] [-u USER] [-f FILE] (COMMAND | -k KEY)

Options:
   -c CONF   ceph.conf file to use [default: ./ceph.conf]
   -u USER   user to connect with ssh
   -f FILE   get names and osds from yaml
   COMMAND   command other than "config get" to execute
   -k KEY    config key to retrieve with config get <key>

-- 
Dan Mick
Red Hat, Inc.
Ceph docs: http://ceph.com/docs