Thanks for the bug report.
Indeed, I can confirm that this limitation affects squid since Focal
(and still exists as of this writing, on Impish).
As you can notice, I found an upstream bug and a Debian bug about the
same issue. Incidentally, the upstream maintainer is also the Debian
package maintainer, and he seems hesitant to explicitly use LimitNOFILE
in the systemd service. I understand why and agree with his rationale;
see below.
If we inspect the squid.service unit (on Bionic), here's what we see:
# systemctl show squid.service | grep NOFILE
LimitNOFILE=1048576
LimitNOFILESoft=1024
According to setrlimit(2)'s manpage:
The soft limit is the value that the kernel enforces for the
corresponding resource. The hard limit acts as a ceiling for the soft limit:
an unprivileged process may set only
its soft limit to a value in the range from 0 up to the hard limit, and
(irreversibly) lower its hard limit. A privileged process (under Linux: one
with the CAP_SYS_RESOURCE
capability in the initial user namespace) may make arbitrary changes to
either limit value.
So you can edit your squid.conf file and set the max_filedescriptors
option to a (much) higher value if you want (1048576 at most), because
squid will then be able to dinamically increase the fd limit without
problems (unless you have a system-wide DefaultLimitNOFILE setting in
place).
Because of all I wrote above, I am closing this bug as Invalid. I agree
that there could be better documentation regarding these settings and
limitations, but I think that's a different issue.
Feel free to reopen the bug (by setting its status as New) if you
disagree with my analysis.
Thank you.
** Changed in: squid (Ubuntu Focal)
Status: New => Invalid
** Changed in: squid (Ubuntu Impish)
Status: Triaged => Invalid
** Changed in: squid (Ubuntu Hirsute)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1943536
Title:
Number filedescriptors allowed too low for squid on Focal
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