Hi Ernesto
OK, well that puts a whole different spin on the problem. I'd not seen
that (it slightly predates my involvement with ceph), and I was just
using the plugin that comes with zabbix so hadn't had any cause to look
more deeply at the restful api. (Note that plugin is completely
different from the zabbix module supplied by ceph, which I discounted as
I knew it was deprecated).
It sounds as though the right path would be for the zabbix-supplied ceph
plugin to be reworked to use the newer ceph dashboard api, if that is
possible. I might take a look at the api and plugin to see what would be
involved.
Regards, Chris
On 06/11/2024 12:48, Ernesto Puerta wrote:
> We use the restful API for monitoring (using the Ceph for Zabbix Agent 2
> plugin, as Zabbix is the over-arching monitoring platform in the data
> centre)
Chris, just FYI: the "restful" mgr module was deprecated 4 years ago
[1] and will be removed in v20 (Tentacle). [2] Something similar will
happen with the "zabbix" mgr module. [3]
[1]
https://lists.ceph.io/hyperkitty/list/ceph-users@xxxxxxx/thread/LBKLNXH7UQL7TLFU5G52Y2SYVME4RS6P/
[2] https://github.com/ceph/ceph/pull/57299
[3] https://docs.ceph.com/en/squid/mgr/zabbix/#zabbix-module
Kind Regards,
Ernesto
On Tue, Nov 5, 2024 at 9:19 PM Laura Flores <lflores@xxxxxxxxxx> wrote:
Thanks for sending this in, Chris.
On Fri, Nov 1, 2024 at 9:47 AM Chris Palmer
<chris.palmer@xxxxxxxxx> wrote:
> Hi Laura
>
> Logged as https://tracker.ceph.com/issues/68801 It is pretty
much as I
> thought, except that the requests are not actually being lost
while the
> balancer is running, but are delayed until it has finished (by
which time
> the client has timed out). Anything more I can do just let me know.
> Regards, Chris
> On 31/10/2024 15:12, Laura Flores wrote:
>
> Hi Chris,
>
> As other users have pointed out, we are fixing an issue tracked
inhttps://tracker.ceph.com/issues/68657
<http://tracker.ceph.com/issues/68657> that seems related to what
you're
> experiencing. However, can you raise a new tracker describing
your problem
> so we can confirm?
>
> Can you please include:
> 1. Steps to reproduce (including any commands you are performing
to invoke
> the restful api)
> 2. MGR logs with `ceph config set mgr.* debug_mgr 20` and `ceph
config set
> mgr mgr/balancer/log_level debug`
>
> Thanks,
> Laura
>
> On Wed, Oct 30, 2024 at 7:24 AM Chris Palmer
<chris.palmer@xxxxxxxxx> <chris.palmer@xxxxxxxxx> wrote:
>
>
> I've just upgraded a test cluster from 18.2.4 to 19.2.0. Package
> install on centos 9 stream. Very smooth upgrade. Only one
problem so far...
>
> The MGR restful api calls work fine. EXCEPT whenever the
balancer kicks
> in to find any new plans. During the few seconds that the
balancer takes
> to run, all REST calls seem to be completely dropped. The MGR
log file
> normally logs the POST requests, but the ones during these few
seconds
> don't appear at all. This causes our monitoring to keep raising
alarms.
>
> The cluster is in a completely stable state, HEALTH_OK, very little
> activity, just the occasional scrubs.
>
> We use the restful API for monitoring (using the Ceph for Zabbix
Agent 2
> plugin, as Zabbix is the over-arching monitoring platform in the
data
> centre). I haven't yet checked the memory leak problems that we
(like
> many) were having, because I have been chasing this new problem.
>
> The problem is quite repeatable. To diagnose I use the zabbix_get
> utility to query every second. Whenever the MGR log file shows the
> balancer kick in the REST requests time out (after 3 seconds -
not sure
> whether the utility or the MGR is timing them out - I suspect the
> utility). They normally complete after a small fraction of a second.
> With the balancer disabled the REST interface works reliably again.
>
> The problem does not occur pre-squid.
>
> Anyone any ideas, or shall I raise a bug?
>
> Thanks, Chris
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>
>
>
--
Laura Flores
She/Her/Hers
Software Engineer, Ceph Storage <https://ceph.io>
Chicago, IL
lflores@xxxxxxx | lflores@xxxxxxxxxx <lflores@xxxxxxxxxx>
M: +17087388804
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