The syslog-ng 3.0 Administrator Guide

Once you have the configuration the way you want you can automate the start of the ALLSYL100 subsystem by modifying the IPL start up program. The name of the IPL start up program is stored in system value QSTRUPPGM. The program is usually QSTRUP in library QGPL. You can modify this program to add the following statements to start the ALLSYL100 subsystem:

QSYS/STRSBS SBSD(ALLSYL100/ALLSYL100)
MONMSG MSGID(CPF0000)

You should place these statements after any commands that start the TCP/IP network services.

If you do not have the source for the QSTRUP program you can retrieve the source using the Retrieve CL Source (RTVCLSRC) command.