[syslog-ng] Increase file descriptors for syslog-ng.

vijay amruth vijayamruth at gmail.com
Fri Mar 10 01:59:36 UTC 2017

Hello everyone, Hope you are all doing great.

I am running into some issues with syslog-ng file descriptors, I have tried
to set up ulimit -n value to 65535,

*open files                      (-n) 65535*

set the parameter to the follwoing in /etc/sysctl.conf, *fs.file-max =

and tried raising the value with syslog-ng --fd-limit <number>, I get the
following error

####syslog-ng --fd-limit 8192
WARNING: Configuration file format is too old, syslog-ng is running in
compatibility mode Please update it to use the syslog-ng 3.5 format at your
time of convinience, compatibility mode can operate less efficiently in
some cases. To upgrade the configuration, please review the warnings about
incompatible changes printed by syslog-ng, and once completed change the
@version header at the top of the configuration file.;
WARNING: global: the default value of log_fifo_size() has changed to 10000
in syslog-ng 3.3 to reflect log_iw_size() changes for tcp()/udp() window
size changes;
Using a global log-fetch-limit() option was removed, please use a
per-source log-fetch-limit();
WARNING: window sizing for tcp sources were changed in syslog-ng 3.3, the
configuration value was divided by the value of max-connections(). The
result was too small, clamping to 100 entries. Ensure you have a proper
log_fifo_size setting to avoid message loss.; orig_log_iw_size='0',
new_log_iw_size='100', min_log_fifo_size='1300000'

and I am unable to  stop the syslog-ng service using systemctl, it
immediately re-starts, I am using centOS 7.2, I have noticed few other
people on the internet had the same problem, please advice, any help is

*OS: CentOS 7.2*
*Hardware : VM*
*Problems : 1) Unable to increase the file descriptors for syslog-ng. 2)
Unable to stop the service using systemctl stop command, it automatically
restarts right after with a new pid.*

Vijay Amrut.
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