[syslog-ng] syslog-ng logging only as foreground process and not as daemon on centos7

[Jordan Ladora]

I've got syslog-ng v3.7.3_7 running on FreeBSD 11-REL as the log server
with both FreeBSD 11-REL and CentOS7 clients (the CentOS clients are
running v3.5.6-3.el7 as it's the latest version installed by yum epel
repo).

It's always worked perfectly on the FreeBSD systems, but a few months ago I
had the same problem described here when setting up a CentOS client-

https://serverfault.com/questions/760383/syslog-ng-working-as-foreground-process-but-not-as-daemon

...I followed the fix of uncommenting the "ForwardToSyslog=yes" line
in /etc/systemd/journald.conf
and it started logging perfectly on CentOS clients, too.

However, in setting up another CentOS7 client yesterday, this fix no longer
worked. If I start syslog-ng via-

chkconfig syslog-ng on
systemctl restart syslog-ng.service

..it starts and runs and is shown in ps, starts automatically after reboot,
but doesn't log to the server. If I start it manually from the terminal
with-

nohup /usr/sbin/syslog-ng -F -p /var/run/syslogd.pid &

...then it does work and starts logging to the server immediately. In that
case there are two identical (except for pid) lines shown by ps, e.g.-

482 /usr/sbin/syslog-ng -F -p /var/run/syslogd.pid
904 /usr/sbin/syslog-ng -F -p /var/run/syslogd.pid

...but only the one I started from the terminal (nohup...) actually logs.

Any help would be much appreciated.

-jl
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