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Bug 1695014 - Clarify the ability to change the NOFILE limit
Summary: Clarify the ability to change the NOFILE limit
Status: POST
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: 389-ds-base
Version: 7.6
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: mreynolds
QA Contact: RHDS QE
Depends On:
TreeView+ depends on / blocked
Reported: 2019-04-02 09:56 UTC by Cedric Buissart 🐶
Modified: 2019-04-15 15:45 UTC (History)
7 users (show)

Fixed In Version:
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Description Cedric Buissart 🐶 2019-04-02 09:56:04 UTC
Description of problem:

Trying to change the NOFILE limits (limit of opened file descriptors that the kernel will allow), I opened the dirsrv@.service.
It redirects to /etc/sysconfig/dirsrv.system

# if you need to set other directives e.g. LimitNOFILE=8192
# set them in this file
.include /etc/sysconfig/dirsrv.system

So I opened the said file and changed the data there, as described :

# This controls the number of file handles avaliable. File handles
# correlate to sockets for the process, and our access to logs and
# databases.

And restarted the service.

Upon restart, *only* the hard-limits was modified. Soft limit was still 1024 :

# cat /proc/$(cat /var/run/dirsrv/  | grep -e Limit -e "open files"
Limit                     Soft Limit           Hard Limit           Units     
Max open files            1024                 65535                files

Upon further search, it appears that ns-slapd overrides its NOFILE soft limits to `nsslapd-maxdescriptors` from cn=config, and defaults to 1024.

I would propose the following changes :

1) by default, if nsslapd-maxdescriptors isn't set in dse.ldif, ns-slapd should not override its corresponding soft limit value. (especially in systemd-enabled system, where there is already a configuration for this)

2) The comments in /etc/sysconfig/dirsrv.system should make it clear that there is a nsslapd-maxdescriptors cn=config entry that may/will override the soft limit

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