Thanks for the feature request Mark!
To illustrate where my understanding ends, here is a patch to stub in
this functionality:
From 137ebc2d5326ca710a5e99e2899fd851b02c10f7 Mon Sep 17 00:00:00 2001
From: Mike Dawson <mdawson@xxxxxxxxxxxxx>
Date: Wed, 4 Sep 2013 11:39:05 -0400
Subject: [PATCH] Update config.cc
---
src/common/config.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/common/config.cc b/src/common/config.cc
index 5c64f4e..89ac0ee 100644
--- a/src/common/config.cc
+++ b/src/common/config.cc
@@ -929,7 +929,7 @@ int md_config_t::set_val_raw(const char *val, const
config_option *opt)
}
static const char *CONF_METAVARIABLES[] =
- { "cluster", "type", "name", "host", "num", "id", "pid" };
+ { "cluster", "type", "name", "host", "num", "id", "pid", "image-name" };
static const int NUM_CONF_METAVARIABLES =
(sizeof(CONF_METAVARIABLES) / sizeof(CONF_METAVARIABLES[0]));
@@ -1007,6 +1007,8 @@ bool md_config_t::expand_meta(std::string
&origval) const
out += name.get_id().c_str();
else if (var == "pid")
out += stringify(getpid());
+ else if (var == "image-name")
+ out += "TBD"
else
assert(0); // unreachable
found_meta = true;
--
1.8.4
Obviously, the I'm stuck at "TBD". I'll finish it if someone could point
me in the right direction.
Thanks,
Mike Dawson
Co-Founder & Director of Cloud Architecture
Cloudapt LLC
6330 East 75th Street, Suite 170
Indianapolis, IN 46250
On 9/4/2013 11:07 AM, Mark Nelson wrote:
On 09/04/2013 09:46 AM, Mike Dawson wrote:
There are currently a few metavariables available for use in ceph.conf:
http://ceph.com/docs/master/rados/configuration/ceph-conf/#metavariables
In addition to those listed in that document, $pid was added in Bobtail.
That allows me to get RBD admin sockets for libvirt/qemu guests by
specifying
[client]
admin socket = /var/run/ceph/rbd-$pid.asok
in /etc/ceph/ceph.conf. That works well for VMs with a single volume,
but it does not work for VMs with multiple volumes. With multiple
volumes, the admin only lists data on the last volume specified, leaving
me unable to monitor stats on any volumes other than the last.
I imagine you could specify a unique admin socket for each volume on the
command-line that libvirt uses to spawn qemu, but that seems like a pain.
Is it possible instead to add a metavariable that would expand to the
image name? This way, my ceph.conf would look like
[client]
admin socket = /var/run/ceph/$imagename.asok
and I would end up with admin sockets like:
/var/run/ceph/rbd-volume-0025b693-6230-443e-ad6a-3aa43efdd648.asok
/var/run/ceph/rbd-volume-009228f3-b8d7-4f3c-8458-0cdbd4809dc6.asok
# rbd -p volumes ls
volume-0025b693-6230-443e-ad6a-3aa43efdd648
volume-009228f3-b8d7-4f3c-8458-0cdbd4809dc6
I'd be happy to provide a patch if someone could give me sufficient
guidance on how/where to add this functionality.
Created a feature request in the tracker for this:
http://tracker.ceph.com/issues/6228
Mark
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