Setting up a Central Syslog Server to listen on both TCP and UDP ports

This document (000020554) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Linux Enterprise 15 SP2
SUSE Linux Enterprise 15 SP3

Situation

Would like to setup a Central Syslog Server to listen on both TCP and UDP ports 514.

Using legacy syntax would fail on SLES 15 SP2 and SP3. Example of legacy syntax when editing the /etc/rsyslog.d/remote.conf file.

TCP Example:
$ModLoad imtcp.so
$UDPServerAddress IP
$InputTCPServerRun PORT

UDP Example
$ModLoad imudp.so
$UDPServerAddress IP
$UDPServerRun PORT

Resolution

1. Use the modern syntax:
Modify /etc/rsyslog.d/remote.conf with the following entries.

#TCP Example:
module(load="imtcp") # needs to be done just once
input(type="imtcp" port="514" address="192.168.86.232")

#UDP Example:
module(load="imudp") # needs to be done just once
input(type="imudp" port="514" address="192.168.86.232")

2. Copy /usr/lib/systemd/system/rsyslog.service to /etc/systemd/system/

3. Make sure the unit section of /etc/systemd/system/rsyslog.service has these two lines:
Wants=network.target network-online.target
After=network.target network-online.target

4. Run systemctl restart rsyslog.service

Additional Information

Referenced Documentation:
https://documentation.suse.com/sles/15-SP2/html/SLES-all/cha-tuning-syslog.html#sec-tuning-syslog-server
https://documentation.suse.com/sles/15-SP3/single-html/SLES-tuning/#sec-tuning-syslog-server

The upstream documentation for imtcp is here:
https://www.rsyslog.com/doc/master/configuration/modules/imtcp.html

The upstream documentation for imudp is here:
https://www.rsyslog.com/doc/master/configuration/modules/imudp.html

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.