On 02/24/2015 06:16 AM, John Spray wrote:
On 24/02/2015 11:57, John Spray wrote:
It would be great, if there will be internal possibility to collect
info about whole cluster from one node. May be, something like
extension for "tell" command, which can call any node directly and
replace external network connections. Or improved version of "ceph osd
perf" command, which would allow to get more info.
This pretty much already exists if someone chooses to deploy
diamond+graphite. Perhaps we need to talk about what's wrong with
that solution as it stands? I'm guessing the main problem is that
it's less highly available than ceph mons, and comparatively
heavyweight, especially if one is only interested in the latest values.
Ah, I also forgot to mention: it is not very hard to make a cut-down
version of calamari that doesn't require lots of heavyweight
dependencies. I started building this a while back before switching
tasks, but there's an old branch here:
https://github.com/ceph/calamari/commits/wip-lite
The key things there are that it doesn't require a postgres database,
and the remote-execution is abstracted into a "Remote" interface so that
you can implement alternatives to salt (e.g. SSH, or run locally on
mon). It's all free software so borrow what you wish ;-) The point is
that it isn't necessary to start from scratch in order to get something
lightweight.
My personal vote is to try to get ourselves well integrated into a good
cross section of the existing tools that already do this kind of thing
(zabbix, collectd, collectl, etc). I'm slightly guilty of rolling my
own too since in cbt I gather up some of our daemon socket output from
all the hosts via ssh and just dump it in the output directory. There's
tons of other systems out there that do this kind of thing way better
though. I don't want to discourage anyone from making a new tool if
that's their preference, but I think a lot of folks would benefit if
they could just keep using their existing monitoring tools.
Perhaps part of this might be to just try to get a better idea of which
tools folks are using to do performance monitoring on their existing
clusters (ceph or otherwise). I've heard zabbix come up quite a bit
recently.
Mark
Cheers,
John
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