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List:       fail2ban-users
Subject:    Re: [Fail2ban-users] fail2ban open files exceeded
From:       David Nutter <david.nutter () bioss ! ac ! uk>
Date:       2017-06-08 17:16:22
Message-ID: 20170608171622.GD22997 () bioss ! ac ! uk
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On Thu, Jun 08, 2017 at 10:56:33AM -0400, imacarthur@moditcms.com wrote:
> Fedora 25
> 
> 
> I have played with sysctl fs.file-max and ulimit -n to set a max 50000.
> ulimit -Hn and ulimit -Sn both report 50000 but when I start fail2ban I
> still get the "too many files open" errors.

ulimit -n will set the number of open files allowed for the shell in which
you run the command. 

However, the limits for fail2ban will be set (for Fedora) in the
systemd configuration or (in other distributions not using systemd to
set limits) in /etc/security/limits.conf

As a temp fix you will need to add LimitNOFILE=15000 (or whatever) in
the [service] section of
 
  /usr/lib/systemd/system/fail2ban.service

then run 

  systemctl daemon-reload
  systemctl restart fail2ban

For a longer term fix put an override file in

/etc/systemd/system/fail2ban.service.d/

man systemd.exec for details on the way systemd handles limits

-- 
David Nutter  				Tel: +44 (0)131 650 4888
BioSS, JCMB, Peter Guthrie Tait Road, Edinburgh, EH9 3FD. Scotland, UK 

Biomathematics and Statistics Scotland (BioSS) is formally part of The
James Hutton Institute (JHI), a registered Scottish charity No. SC041796
and a company limited by guarantee No. SC374831


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