I am using the copr RPM build syslog-ng-3.13.2-3.el7.centos.x86_64 on a redhat 7 system. I am trying to use the confgen to create a value and use it in a rewrite. I realize that I can use $LOGHOST in this context but am using it as an example. @module confgen context(rewrite) name(z_myself) exec("/usr/bin/hostname") rewrite r_local { set( "z_myself()", value("HOST") ); }; log { source(local); rewrite(r_local); destination(d_var_syslog); }; d_var_syslog is any file destination to capture the log message. The above configuration actually sets the hostname in the log line to be "z_myself()". 2018-02-17T21:15:39.220-08:00 z_myself() solaris-cron.err erempel: just testing if I make the rewrite rewrite r_local { set( z_myself(), value("HOST") ); }; I get syntax errors. The top example works on redhat 6 with syslog-ng 3.9 I can't find any documentation on how to use a block (confgen) define in a rewrite statement. I have tried back ticks, $(z_myself()) macros "`z_myself()`" and any other combination but they all result in syslog-ng failing to start. What am I doing wrong? Evan.