> Well at least in Redhat, if you do systemctl reload postfix it just
> executes postfix reload internally. So it makes absolutely no
> difference.
> # cat /usr/lib/systemd/system/postfix.service
> [Unit]
> Description=Postfix Mail Transport Agent
> After=syslog.target network.target
> Conflicts=sendmail.service exim.service
> [Service]
> Type=forking
> PIDFile=/var/spool/postfix/pid/master.pid
> EnvironmentFile=-/etc/sysconfig/network
> ExecStartPre=-/usr/libexec/postfix/aliasesdb
> ExecStartPre=-/usr/libexec/postfix/chroot-update
> ExecStart=/usr/sbin/postfix start
> ExecReload=/usr/sbin/postfix reload
> ExecStop=/usr/sbin/postfix stop
> [Install]
> WantedBy=multi-user.target

Hmm.  My Ubuntu system has no such file.

~$ sudo systemctl status postfix.service
● postfix.service - LSB: Postfix Mail Transport Agent
   Loaded: loaded (/etc/init.d/postfix; bad; vendor preset: enabled)
  Drop-In: /run/systemd/generator/postfix.service.d
   Active: active (running) since Wed 2017-08-09 10:20:02 PDT; 1 day 1h ago
     Docs: man:systemd-sysv-generator(8)
    Tasks: 4
   Memory: 6.5M
      CPU: 1.836s
   CGroup: /system.slice/postfix.service
           ├─ 1971 /usr/lib/postfix/sbin/master
           ├─20028 qmgr -l -t unix -u
           ├─20030 pickup -l -t unix -u -c
           └─20039 tlsmgr -l -t unix -u -c

I'm a newbie to systemd.  But I guess the above is telling me that the
postfix.service is auto-generated.
Looking at the file listed in "Drop-In", I don't see the reload command.

$ cat
# Automatically generated by systemd-insserv-generator


The logical assumption would be that the auto-generated service would have
the same commands as "postfix ...".  
But I haven't yet figured out how to show/prove whether "postfix reload" =
"systemctl reload postfix"


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