Description of problem:

The RHDS 10 doc is showing the RHEL 6 configuration, it needs to be updated for RHEL 7


https://access.redhat.com/documentation/en-US/Red_Hat_Directory_Server/10/html/Performance_Tuning_Guide/file-descriptors.html#ds-file-descriptors
 ⁠
3.3.2. Setting Directory Server File Descriptor Values

"
 To reset the file descriptors for Directory Server:

    Edit the /etc/sysconfig/dirsrv file and add a new line setting the process ulimit.

    ulimit -n 8192
"

should be

"
 To tune the number of file descriptors for the Red Hat Directory Server:

    Edit the file /etc/sysconfig/dirsrv.systemd and uncomment the line specifying the file descriptor limit:

    LimitNOFILE=8192

or use the string "infinity" to configure with "no limit", but limited by /proc/sys/fs/file-max
or sysctl fs.file-max 
"


and

3.3.1. Resetting the Host Machine's File Descriptors
also shows the RHEL6 statements

"
2. If the setting is lower than 64000, edit the /etc/sysctl . co nf file, and reset the fs.file-
max parameter:
fs.file-max = 64000
3. Then increase the maximum number of open files on the system by editing the
/etc/security/limits.conf configuration file. Add the following entry:
*
-
nofile
8192
4. Edit the /etc/pam.d/system-auth, and add this entry:
session required pam_limits.so
5. Reboot the machine to apply the changes.
"

I am not sure why it need to change PAM related settings for the LDAP service, the /etc/security/limits.conf may not be necessary, and /etc/pam.d/system-auth already has by default the line
session     required      pam_limits.so


so I would propose this:

"
2. If the setting is lower than 64000, modify its value

either for a temporary change:
sysctl -w fs.file-max=64000

or for a permanent change, edit the configuration file /usr/lib/sysctl.d/00-system.conf
fs.file-max = 64000

3. Reboot the system to apply the changes.
"

I tested with a super low FD number, reboot, and could not start ns-slapd as expected, so this simple configuration seem to properly affect the file descriptor configuration for RHDS 10 on RHEL 7


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