Process-one
ejabberd
ejabberd@conference.process-one.net
Friday, January 18, 2019< ^ >
zinid has set the subject to: ejabberd discussions: https://docs.ejabberd.im
Room Configuration
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GMT+0
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[07:29:32] <zinid> Licaon_Kter, I commited both changes to RTB
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[07:35:16] <Licaon_Kter> zinid: I'll update
In the mean time, regarding the error reasons above?
[07:36:03] <zinid> well
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[07:36:27] <zinid> > Resumption failed: Previous session PID is dead (item-not-found): XX
This looks like OOM killer
[07:36:42] <zinid> > HTTP failure: connection refused: 3088
This is probably due to overload
[07:37:05] <zinid> Other "Resumption failed" is somewhat okayish
[07:37:29] <zinid> > Failed to set MAM preferences for user*@192.168.100.2.xip.io: Database failure (internal-server-error): 2
You must have something in the error.log
[07:37:50] <zinid> > Stream closed by local host: Stream negotiation timeout (connection-timeout): 1
This is due to overload
[07:38:11] <zinid> > Failed to join room large1@conference.192.168.100.2.xip.io: Too many users in this conference (resource-constraint): 261
Configure the room to accept MOAR users?
[07:38:43] <zinid> > Connection failed: connection closed: 405
This is due to overload
[07:38:49] <Licaon_Kter> Ok, it keeps pretty constant sessions numbers, except at start when (as expected I guess) it will get overloaded, but after that CPU usage is low and memory kinda constant.
[07:39:04] <zinid> decrease arrival rate?
[07:39:15] <zinid> currently you have 10 connection/sec?
[07:39:20] <Licaon_Kter> > You must have something in the error.log
ejabberd log?
[07:39:24] <zinid> Licaon_Kter, yes
[07:39:35] <zinid> typically database requests don't fail silently
[07:39:49] <zinid> at least not for private if recent ejabberd is used
[07:39:59] <Licaon_Kter> > decrease arrival rate?
> currently you have 10 connection/sec?
Have to look it up
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[07:40:18] <zinid> Licaon_Kter, tl;dr just decrease `interval` twice
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[07:42:44] <Licaon_Kter> `Kicked from room` saw the log, it was because: `It is not allowed to send error messages to the room. The participant (us
erXXX) has sent an error message (service-unavailable) and got kicked from the room`
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[07:43:32] <zinid> Licaon_Kter, yeah, probably it is not joined to the room or something
[07:43:48] <zinid> Licaon_Kter, typical scenario in XMPP we see every day :)
[07:43:56] <Licaon_Kter> Hmmm
[07:48:10] <zinid> You still have probably OOM killer raging, a lot of errors might be related to killed c2s sessions
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[07:48:35] <zinid> including these "kicks"
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[07:53:33] <Licaon_Kter> Right
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[07:56:53] <zinid> Licaon_Kter, is it your new rpi?
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[08:05:16] <Licaon_Kter> You've guessed it! :))
[08:07:46] <Licaon_Kter> zinid: any chance that the nice live graphs from rtb to come to ejabberd webadmin or something?
[08:08:11] <zinid> Licaon_Kter, very little :/
[08:08:25] <zinid> I am constantly overloaded with other tasks
[08:08:50] <zinid> and this requires a lot of effort, given that I'm virtually total zero in web dev
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[08:10:13] <Licaon_Kter> Right :(
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[08:11:11] <Licaon_Kter> > Licaon_Kter, tl;dr just decrease `interval` twice
It's 100 by default, you mean 25?
[08:11:38] <zinid> interval is a mandatory option
[08:11:46] <zinid> if you have it 100 now then decrease to 50
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[08:13:07] <zinid> I also fail to see how 25 is "twice" less than 100 :D
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[08:16:53] <Licaon_Kter> Decrece twice = decrease once from 100 to 50, decrease a second time from 50 to 25 lol
[08:18:06] <zinid> šŸ˜³
[08:18:51] <Licaon_Kter> Yeah, lost in translation
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[08:21:46] <Licaon_Kter> Also, given that's interval between connections, making it smaller means more connections, hence shouldn't I make it twice as big, increase it to 200 ms?
[08:21:58] <zinid> argh
[08:22:00] <zinid> you damn right
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[08:24:24] <Licaon_Kter> ;)
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[09:50:16] <Licaon_Kter [cnvrs]> This went sideways...
```
sudo -u ejabberd ejabberdctl connected_users_number
8075
```
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[09:51:49] <zinid> yeah, killing c2s'es doesn't clear session table correctly
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[09:53:06] <Licaon_Kter [cnvrs]> I've set interval to 200, reenabled proxy65...
[09:54:08] <Licaon_Kter> https://upload.convorb.im/7c370453f738f2c0c995eaee643e5e0aba76aeb0/EDnynvfZKmzQNO8C4ujRZzxzKTyzqKJUq7pUgUXI/rtb0118_1.PNG
[09:55:07] <zinid> RTT is very high
[09:55:14] <Licaon_Kter [cnvrs]> Memory used is at 75%, stays there.
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[09:55:20] <zinid> still tons of errors
[09:55:29] <zinid> oom killer is disabled?
[09:55:53] <Licaon_Kter [cnvrs]> nope, watermark 90
[09:56:35] <Licaon_Kter [cnvrs]> rtb show error
`Connection failed: connection closed: 6379`
`Stream closed by local host: Stream negotiation timeout (connection-timeout): 1582`
`Resumption failed: Session state copying timed out (item-not-found): 531`
and plenty of those mentioned yesterday
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[09:57:38] <Licaon_Kter [cnvrs]> I'll have to retest without proxy65, also I've setup `ip: "::"` for it so it's setup like all the other ports, not sure if it matters
[09:58:48] <Licaon_Kter [cnvrs]> dmesg says `TCP: request_sock_TCP: Possible SYN flooding on port 5222. Sending cookies.  Check SNMP counters.` at one point...
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[10:26:58] <Licaon_Kter [cnvrs]> Looking at errors I guess postgres went down in the picture above: ` [error] <0.11650.0> CRASH REPORT Process <0.11650.0> with 0 neighbours exited with reason: {error_response,[{severity,'FATAL'},{86,<<"FATAL">>},{code,<<"53300">>},{message,<<"remaining connection slots are reserved for non-replication superuser connections">>},{file,<<"postinit.c">>},{line,791},{routine,<<"InitPostgres">>}]} in gen_server:init_it/6 line 358`
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[11:02:37] <zinid> Licaon_Kter, well regarding postgres this is a misconfiguration
[11:02:45] <zinid> also, what sql_pool_size?
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[11:22:18] <Licaon_Kter [cnvrs]> 4 as the no. of cores
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[11:23:33] <zinid> try setting 10
[11:23:58] <Licaon_Kter [cnvrs]> lol, back to the old mysterious value? šŸ™‚
[11:24:34] <zinid> also there is the configuration in postgres to increase maximum allowed connections
[11:25:14] <Licaon_Kter [cnvrs]> That's at 100 by default...
[11:25:18] <zinid> Licaon_Kter [cnvrs]: kinda, if you have problems with db performance you try to increase pool size first
[11:25:36] <zinid> then that postgres message is weird
[11:30:39] <Licaon_Kter [cnvrs]> in postgres config I've made one change `shared_buffers = 256MB` from 128MB
[11:31:11] <Licaon_Kter [cnvrs]> I'll put that nack just in case...
[11:31:14] <Licaon_Kter [cnvrs]> *back
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[12:06:19] <zinid> Licaon_Kter [cnvrs]: I don't know what that means, probably some shared memory between the Unix processes, old school shit
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[12:07:49] <Licaon_Kter [cnvrs]> muc, max_users: 1000, rtb log still has `Failed to join room large1@...: Too many users in this conference (resource-constraint): 104` šŸ˜ž
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[12:10:03] <Holger> I think shared_buffers no longer uses that old-school SHM thing, but either way it's *the* Postgres cache, so can make a great performance difference if you have large (MAM/whatever) indexes or so.
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[12:18:45] <zinid> Licaon_Kter [cnvrs]: there are two options for this, one for mod_muc and another one for default_room_options
[12:19:06] <zinid> don't ask me why this is done this way plz
[12:19:26] <Licaon_Kter [cnvrs]> I've set it only once in module, should I in default_ ? both?
[12:19:43] <zinid> Licaon_Kter [cnvrs]: try both
[12:19:49] <Licaon_Kter [cnvrs]> mmmkay
[12:20:46] <zinid> are you going to provide a public server? šŸ˜ why all the hassle with rtb?
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[12:21:49] <Licaon_Kter [cnvrs]> no, not sure, there are a lot of public ones already.
[12:21:55] <zinid> > I think shared_buffers no longer uses that old-school SHM thing, but either way it's *the* Postgres cache, so can make a great performance difference if you have large (MAM/whatever) indexes or so.
like caching via mmap()? lmdb style?
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[12:22:50] <Licaon_Kter [cnvrs]> I want to see how it behaves when loaded, so I;m not surprised
I want to see its limits too
[12:23:26] <zinid> don't you see them already?
[12:23:45] <zinid> looking at the graphs 500 users is the limit
[12:25:00] <zinid> note that when the system is capable to sustain the capacity you typically see zero errors
[12:25:26] <zinid> except maybe a few socket failures
[12:26:44] <zinid> > no, not sure, there are a lot of public ones already.
yeah, I almost never recommend running a public server šŸ˜
[12:27:26] <zinid> two many poorly maintained servers already rendering xmpp in bad light
[12:29:20] <Licaon_Kter [cnvrs]> > looking at the graphs 500 users is the limit
now I'm testing with 300, watermark 90, RAM fills up, oom kills them, more errors... šŸ˜ž
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[12:33:23] <zinid> disable http upload and pubsub šŸ˜
[12:33:31] <zinid> and tls šŸ˜
[12:34:21] <zinid> actually the bottle neck can be investigated via p1_prof
[12:35:36] <zinid> but I suggest disabling those first to see if you get improvement
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[12:36:32] <zinid> ```
http_upload_interval: false
starttls: false
```
[12:36:57] <zinid> and remove mod_pubsub from ejabberd.yml
[12:37:03] <Licaon_Kter [cnvrs]> I thought about this, will do that too, but it feels unrealistic
[12:37:10] <zinid> I know
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[12:37:23] <zinid> this is not permanent
[12:37:50] <zinid> regarding http upload you can use nginx
[12:38:07] <zinid> and haproxy for tls šŸ˜€
[12:38:19] <Licaon_Kter [cnvrs]> and sslh on top
[12:38:22] <zinid> but no solution for pubsub
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[12:39:49] <Licaon_Kter [cnvrs]> About upload, there are no files created, is that ok?
[12:40:54] <zinid> Licaon_Kter [cnvrs]: no
[12:42:02] <zinid> seems like your 3308 port is unreachable
[12:42:24] <zinid> I recall that http error message from your report
[12:42:54] ave joins the room
[12:43:33] <Licaon_Kter [cnvrs]> Why that port? I have 5444 in config... how does it detect the port? ]
[12:43:40] <zinid> Licaon_Kter [cnvrs]:
> HTTP failure: connection refused: 3088
this ^^^
[12:43:51] <zinid> ah
[12:43:55] <zinid> sorry
[12:44:04] <zinid> that's the errors number
[12:44:11] <Licaon_Kter [cnvrs]> šŸ™‚
[12:44:13] rincewind leaves the room
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[12:44:20] <zinid> whatever
[12:44:35] <zinid> whatever port is unreachable
[12:45:07] <zinid> it detects the port via described xep procedure
[12:45:12] ave joins the room
[12:45:35] cromain leaves the room
[12:46:13] <zinid> so when you enable/fiix upload things will get even worse šŸ˜
[12:46:25] <Licaon_Kter [cnvrs]> I know :))
[12:49:32] info-screen joins the room
[12:53:28] <Licaon_Kter [cnvrs]> I've also put max_users in defaults, so no more errors about that
[12:53:43] <Licaon_Kter [cnvrs]> Seeing this in the ejabberd log though: https://pastebin.com/KB0qPrkq
[12:53:44] rincewind leaves the room: Stream closed by us: Timed out waiting for stream resumption (connection-timeout)
[12:55:28] rincewind joins the room
[12:55:42] <zinid> yes, I see them a lot too
[12:56:07] <zinid> that's a cosmetic bug and a consequence of overload
[12:56:32] <zinid> resumption is too slow or something
[12:56:35] <Licaon_Kter [cnvrs]> ok
[12:57:03] <zinid> I reported them to Holger already šŸ˜
[12:57:37] <Licaon_Kter [cnvrs]> Regarding kicked from room, that's the bulk of the errors, you say it can't be fixed?
[12:58:02] <Holger> Oh?  Forgot, of course.  Gonna look.
[12:58:05] <zinid> Licaon_Kter [cnvrs]: killed sessions produce them I think
[12:58:30] Alexander leaves the room
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[12:58:59] <zinid> Holger: just run rtb with mod_stream_mgmt enabled, overload the server and you will get plenty of them
[12:59:26] <Licaon_Kter [cnvrs]> RTB kills them?
[12:59:34] <zinid> Licaon_Kter [cnvrs]: no ejabberd
[13:00:02] <zinid> Licaon_Kter [cnvrs]: then rtb reconnects and of course the new reconnected session is not joined
[13:01:28] Alacer joins the room
[13:01:48] <zinid> that's just my assumption
[13:02:07] <Licaon_Kter [cnvrs]> Not sure how can I fix these:
`Proxy65 failure: non-existing domain: xxx`
`HTTP failure: non-existing domain: xxx`
`Failed to set proxy65 streamhosts to user*@...: Proxy65 failure: non-existing domain (internal-server-error): `
Given that they should resolv to the local LAN...
[13:02:31] <zinid> rtb fails to resolve it
[13:03:54] <Licaon_Kter [cnvrs]> ```
```
[13:04:01] <Licaon_Kter [cnvrs]> ```
; <<>> DiG 9.10.3-P4-Debian <<>> 192.168.100.2.xip.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60292
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;192.168.100.2.xip.io.          IN      A
;; ANSWER SECTION:
192.168.100.2.xip.io.   300     IN      A       192.168.100.2
;; Query time: 182 msec
;; SERVER: 95.77.94.88#53(95.77.94.88)
;; WHEN: Fri Jan 18 15:03:11 EET 2019
;; MSG SIZE  rcvd: 65
```
[13:04:33] <Licaon_Kter [cnvrs]> ```
; <<>> DiG 9.10.3-P4-Debian <<>> 192.168.100.2.xip.io
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60292
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;192.168.100.2.xip.io.          IN      A
;; ANSWER SECTION:
192.168.100.2.xip.io.   300     IN      A       192.168.100.2
;; Query time: 182 msec
;; SERVER: 95.77.94.88#53(95.77.94.88)
;; WHEN: Fri Jan 18 15:03:11 EET 2019
;; MSG SIZE  rcvd: 65
```
[13:05:17] <zinid> no idea
[13:05:26] <Licaon_Kter [cnvrs]> and I can put proxy or upload in front and still resolv as expected, not sure why rtb?erlang? fails to
[13:06:23] <zinid> put them into /etc/hosts, dunno
[13:06:26] <Licaon_Kter [cnvrs]> IIRC, uploads work fine too from a client
[13:06:31] <Licaon_Kter [cnvrs]> Right... will do
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[14:19:06] <Licaon_Kter [cnvrs]> No joy, even in hosts, still can't connect or resolv or something
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[15:24:53] <zinid> Licaon_Kter [cnvrs], set IP addresses in the ejabberd config
[15:25:06] frainz joins the room
[15:25:21] <Licaon_Kter> Will try that.
[15:26:06] nekit leaves the room
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[16:24:40] ta leaves the room: Disconnected: Received SIGTERM
[16:24:40] ta leaves the room: Disconnected: Received SIGTERM
[16:24:56] chrys leaves the room
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[16:25:26] ta joins the room
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[16:35:07] edhelas leaves the room: Connection failed: connection closed
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[16:36:06] edhelas leaves the room: Stream reset by peer
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[16:56:21] <jonny> Does anyone know why my user picture is not shown in this room? All my other contacts can see it...
[16:56:34] <jonny> Oh sorry works
[16:56:39] <jonny> šŸ™‚
[17:01:50] <zinid> jonny, mod_avatar
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[23:15:11] <jonny> When i enable a module in ejabberd is a reload enough to have it active?
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[23:31:04] <Licaon_Kter> jonny: open an issue on Github if it's not ;)
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