1. `systemctl reload postgrey` is broken, so use restart in that case
2. `systemctl restart nsd` succeeds once /var/log is writable by systemd. However, nsd still fails to write to /var/log/nsd.log if the file already exists
3. the default configuration for rsyslogd is to no longer create a /var/run/rsyslogd.pid file, so use /usr/bin/pidof in that case
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