Systemd service life cycle

[Ralf Mardorf]

Off-topic

On Tue, 12 Apr 2016 17:57:09 +0200, Tom H wrote:
>1) You have a typo (a missing "e")

Oops, thank you.

>2) Why do you have options prepended with "--" and other not?

By force of habit ...

>3) Why do you create an rc.d symlink? Neither Ubuntu nor Arch need it.

... in combination with backwards compatibility and portability.

For command line I prefer "--option" over "option", but services/init
scripts used "start,stop,status" without "--".

rc.d was init.d on Arch Linux, today it's unneeded, but I might still
have some scripts that start audio sessions and run rtirq:

[weremouse at moonstudio ~]$ ls -ld /mnt/archlinux/etc/rc.d
drwxr-xr-x 2 root root 4096 Sep 26  2015 /mnt/archlinux/etc/rc.d
[weremouse at moonstudio ~]$ ls -l /mnt/archlinux/etc/rc.d
total 0
lrwxrwxrwx 1 root root 21 Jul 28  2015 alice -> /usr/local/sbin/alice
lrwxrwxrwx 1 root root 26 Sep 26  2015 alice-dhcp -> /usr/local/sbin/alice-dhcp
lrwxrwxrwx 1 root root 14 Apr 22  2015 rtirq -> /usr/bin/rtirq

Ubuntu still needs init.d and for script portability I linked:

[weremouse at moonstudio ~]$ ls -ld /etc/rc.d
lrwxrwxrwx 1 root root 7 Jul 28  2015 /etc/rc.d -> init.d/

[weremouse at moonstudio ~]$ sudo systemd-nspawn -qD /mnt/archlinux
[sudo] password for weremouse: 
Failed to create directory /mnt/archlinux/sys/fs/selinux: Read-only file system
Failed to create directory /mnt/archlinux/sys/fs/selinux: Read-only file system
[root at archlinux ~]# service status rtirq
/usr/local/bin/service: line 3: /etc/rc.d/status: No such file or directory

:D by now habits changed. FWIW "systemctl status rtirq" still isn't the
same as "/path/rtirq status", resp. "service rtirq status".

[root at archlinux ~]# service rtirq status

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND	

[root at archlinux ~]# rtirq status

  PID CLS RTPRIO  NI PRI %CPU STAT COMMAND

Regards,
Ralf