Setup Centralized Logging Server in Linux | Configure rsyslog Server & Client in RHEL (CentOS)

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Configure Centralized rsyslog Server in RHEL:
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rsyslog is responsible for log processing in RHEL. rsyslog is abbreviation of ‘Rocket Fast System for Log processing’. rsyslog offers high-performance, great security features and modular design. It can accept input from wide variety of sources, transform it and output the result to diverse destinations.

In this article, we will configure a central logging server using rsyslog on RHEL and then we will configure RHEL clients to submit their local logs to this rsyslog based central logging server.

Environment Specification:
We are using two virtual machines, one as the rsyslog server and the other as the rsyslog client.
SERVER IP Address: 192.168.1.180 (RHEL 7.7)
CLIENT IP Address: 192.168.1.170 (RHEL 7.3)

Configuring rsyslog Server on RHEL 7.7:
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1. rsyslog is by default installed on most of the Linux distros including RHEL/CentOS.
# rpm -qi rsyslog

2. Now we are configuring rsyslog settings to accept input from other machines.
Find and uncomment following two directives.
$ModLoad imtcp
$InputTCPServerRun 514

Save settings.

4. Allow rsyslog service port in Linux firewall and reload the firewall.
# firewall-cmd --permanent --add-port=514/tcp
# firewall-cmd --reload

Our rsyslog server has been configured to received input from other log sources via port 514/tcp.

Configuring rsyslog Client on RHEL 7.3:
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# rpm -qi rsyslog

# *.* 192.168.1.180:514

Our rsyslog client has been configured.
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Now connect to our rsyslog server and check /var/log/messages
# tail /var/log/messages

We can see that client is forwarding its logs to server.

We have successfully configure a central login server using rsyslog on CentOS 7.

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