On 03.08.22 08:17, ngtech1ltd@xxxxxxxxx wrote:
I was under the impression that Systemd does impose a basic limit but I can test it to verify my doubts.
From my point of view and testing until now systemd does impose a basic global limit.
this matches my observations - after logging into system, I see 1k soft and
1M hard limit.
I have replaced squid binary with script that prints and replaces files
limit and this is the result:
# cat /usr/sbin/squid
#!/bin/sh
ulimit -n -S > /tmp/limit.$$
ulimit -n -H >> /tmp/limit.$$
ulimit -n -S 2048
ulimit -n -S >>/tmp/limit.$$
ulimit -n -H >> /tmp/limit.$$
exec /usr/sbin/squid.real "$@"
# cat limit.1490
1024
524288
2048
524288
before:
2022/08/03 14:33:11 kid1| With 1024 file descriptors available
after:
2022/08/03 14:44:04 kid1| With 2048 file descriptors available
-----Original Message-----
From: squid-users <squid-users-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Amos Jeffries
Sent: Wednesday, 3 August 2022 5:31
To: squid-users@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: filedescriptors on debian/systemd
On 3/08/22 01:54, Matus UHLAR - fantomas wrote:
I have encountered Debian bug 934208:
2022/07/28 16:40:53 kid1| With 1024 file descriptors available
2022/07/29 06:50:18 kid1| WARNING! Your cache is running out of
filedescriptors
according to the bug report:
"Under systemd the default is not to have any limitation at all."
To clarify, what that means is that *systemd* does not impose any limit
by default.
as wee see above, it does.
Squid when it cannot find a limit sets 1024 as default.
This may be the default if squid can't find a limit, but in this case the
soft limit is set.
Under systemd the "correct" way to set such a limit is for the admin to
decide on a limit and configure it. You can do this is two ways:
I believe setting sane default (>1024) in squid itself or a systemd unit
file is a better option.
Especially when sysvinit script sets such default.
1) set the systemd local config like you did:
# cat /etc/systemd/system/squid.service.d/override.conf
[Service]
LimitNOFILE=65536
and after reloading systemd:
# systemctl daemon-reload
or, 2)
set max_filedescriptors in squid.conf
--
Matus UHLAR - fantomas, uhlar@xxxxxxxxxxx ; http://www.fantomas.sk/
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