[tor-relays] Too many connections warning

[Tyler Johnson]

I believe this warning describes a lack of available file descriptors,
limiting the amount of connections your tor relay is able to make.

ulimit -n is exactly the command you want to use to raise that limit from
your current 1024.

What exactly that number should be, I couldn't say, but you could start at
10000 and raise / lower based on your needs and resources.

Raising a similar limit on OpenBSD from the default to 20000 helped
eliminate the error for me.



On Dec 7, 2017 7:28 AM, "Logforme" <m7527 at abc.se> wrote:

> I run the non-exit relay Logforme (855BC2DABE24C861CD887DB9B2E95
> 0424B49FC34).
>
> Today I saw a new warning in my tor log file:
> Dec 07 09:48:12.000 [warn] Failing because we have 32735 connections
> already. Please read doc/TUNING for guidance.
>
> The relay runs on an old Debian Wheezy machine. Me being a Linux noob I
> tried to read the doc/TUNING document (https://gitweb.torproject.org
> /tor.git/tree/doc/TUNING) but the only information I deemed suitable for
> me was "Use ulimit -n", which I ran and it reported "1024". I guess that's
> not of interest for this warning.
>
> Over the years I have added some stuff to my sysctl.conf file that I have
> picked up. Don't remember from where:
> # Tor
> net.core.rmem_max = 33554432
> net.core.wmem_max = 33554432
> net.ipv4.tcp_rmem = 4096 87380 33554432
> net.ipv4.tcp_wmem = 4096 65536 33554432
> net.core.rmem_default = 524287
> net.core.wmem_default = 524287
> net.core.optmem_max = 524287
> net.core.netdev_max_backlog = 300000
> net.ipv4.tcp_mem = 33554432 33554432 33554432
> net.ipv4.tcp_max_orphans = 300000
> net.ipv4.tcp_max_syn_backlog = 300000
> net.ipv4.tcp_fin_timeout = 4
> vm.min_free_kbytes = 65536
> net.ipv4.tcp_keepalive_time = 60
> net.ipv4.tcp_keepalive_intvl = 10
> net.ipv4.tcp_keepalive_probes = 3
> net.ipv4.ip_local_port_range = 1025 65530
> net.core.somaxconn = 30720
> net.ipv4.tcp_max_tw_buckets = 2000000
> net.ipv4.tcp_timestamps = 0
> net.ipv4.tcp_challenge_ack_limit = 999999999
>
> None of the values seem to match the 32735 mentioned in the warning so I'm
> at a loss for what I am supposed to change.
> Anyone knowledgeable of these things that can give me some pointers?
>
>
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>
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