[SR-Users] Problem with max tcp connections

Daniel Tryba d.tryba at pocos.nl
Tue Nov 26 10:32:59 CET 2019


On Thu, Nov 21, 2019 at 07:49:28PM +0100, Jose Fco. Irles Dur?? wrote:
> Thanks for the info!
> 
> Tomorrow I'll test it with the 5.1.9 version.
> 

Well, the problem happened to me on 2 different loadbalancers (withing
24 hours where the loadbalancers had a near identical uptime) For about
35m no new connections can be established. Already established
connections work fine. I'm not seeing any queueing in to OS (netstat/ss)
After some time all works well again without doing anything to the machine/kamailio.

I could try to make a core dump if this happens again and the timing is more 
appropriate for that.

kamcmd> core.tcp_info 
{
        readers: 4
        max_connections: 4096
        max_tls_connections: 2048
        opened_connections: 617
        opened_tls_connections: 0
        write_queued_bytes: 0
}

tcp options in .cg:
tcp_max_connections=4096
tcp_connection_lifetime=3605

Only funny thing I see is that there are some TCP connections with a very high timeout:

{
        id: 15453
        type: TCP
        state: CONN_OK
        timeout: 268435455
        lifetime: 3605
        ref_count: 2
        src_ip: a.b.c.d
        src_port: 51196
        dst_ip: e.f.g.h
        dst_port: 5060
}

The timeout is either [0,3605] or 268435455. The high timeout ones
dissear quickly:

while sleep 1 ; do date; kamcmd core.tcp_list | grep 268435455; done

Tue Nov 26 10:29:21 CET 2019
Tue Nov 26 10:29:22 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:23 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:24 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:25 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:26 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:27 CET 2019
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:28 CET 2019
        timeout: 268435455
        timeout: 268435455
Tue Nov 26 10:29:29 CET 2019
        timeout: 268435455
        timeout: 268435455




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