15.7. Configuring remote logging to a server over UDP

Procédure

1. Create a new .conf file in the /etc/rsyslog.d/ directory, for example, 10-remotelogcli.conf, and insert the following content:

   *.* action(type="omfwd"
         queue.type="linkedlist"
         queue.filename="example_fwd"
         action.resumeRetryCount="-1"
         queue.saveOnShutdown="on"
         target="example.com" port="portno" protocol="udp"
        )

   Où ?

   • queue.type="linkedlist" enables a LinkedList in-memory queue.
   • queue.filename defines a disk storage. The backup files are created with the example_fwd prefix in the working directory specified by the preceding global workDirectory directive.
   • The action.resumeRetryCount -1 setting prevents rsyslog from dropping messages when retrying to connect if the server is not responding.
   • enabled queue.saveOnShutdown="on" saves in-memory data if rsyslog shuts down.
   • portno is the port number you want rsyslog to use. The default value is 514.

   • The last line forwards all received messages to the logging server, port specification is optional.

     With this configuration, rsyslog sends messages to the server but keeps messages in memory if the remote server is not reachable. A file on disk is created only if rsyslog runs out of the configured memory queue space or needs to shut down, which benefits the system performance.

   Note

   Rsyslog processes configuration files /etc/rsyslog.d/ in the lexical order.

2. Restart the rsyslog service.

   # systemctl restart rsyslog

3. Optional: If rsyslog is not enabled, ensure the rsyslog service starts automatically after reboot:

   # systemctl enable rsyslog

1. Sur le système client, envoyez un message de test :

   # logger test

2. On the server system, view the /var/log/remote/msg/hostname/root.log log, for example:

   # cat /var/log/remote/msg/hostname/root.log
   Feb 25 03:53:17 hostname root[6064]: test

   Where hostname is the host name of the client system. Note that the log contains the user name of the user that entered the logger command, in this case root.