1.5. Configuring netconsole

Procedure 1.1. Configuring an rsyslog server for netconsole

1. Configure the rsyslogd daemon to listen on the 514/udp port and receive messages from the network by uncommenting the following lines in the MODULES section of the /etc/rsyslog.conf file:

   $ModLoad imudp
   $UDPServerRun 514

2. Restart the rsyslogd service for the changes to take effect:

   ]# systemctl restart rsyslog

3. Verify that rsyslogd is listening on the 514/udp port:

   ]# netstat -l | grep syslog
   udp        0      0 0.0.0.0:syslog          0.0.0.0:*
   udp6       0      0 [::]:syslog             [::]:*

   The 0.0.0.0:syslog and [::]:syslog values in the netstat -l output mean that rsyslogd is listening on default netconsole port defined in the /etc/services file:

   ]$ cat /etc/services | grep syslog
   syslog          514/udp
   syslog-conn     601/tcp                 # Reliable Syslog Service
   syslog-conn     601/udp                 # Reliable Syslog Service
   syslog-tls      6514/tcp                # Syslog over TLS
   syslog-tls      6514/udp                # Syslog over TLS
   syslog-tls      6514/dccp               # Syslog over TLS

Procedure 1.2. Configuring a Sending Machine

1. Set the value of the SYSLOGADDR variable in the /etc/sysconfig/netconsole file to match the IP address of the syslogd server. For example:

   SYSLOGADDR=192.168.0.1

2. Restart the netconsole service for the changes to take effect:

   ]# systemctl restart netconsole.service

3. Enable netconsole.service to run after rebooting the system:

   ]# systemctl enable netconsole.service

4. View the netconsole messages from the client in the /var/log/messages file (default) or in the file specified in rsyslog.conf.

   ]# cat /var/log/messages