====== Devuan vs Debian or SysV vs Systemd ======

I want to make a honest test to boot a Devuan with [[:sysv|SysV]] and Debian with Systemd.

===== The scenario =====
Devuan 1.0 and Debian 8.8, all updated to latest packages with netinstall.

Two virtual machines with 1 vCPU and 1G of RAM:

{{::shot-2017-05-26_17-26-34.jpg?400|}}

The partition schema:

{{::shot-2017-05-26_17-17-25.jpg?800|}}

Packages installed:

{{::shot-2017-05-26_17-25-01.jpg?800|}}

The login screen Debian at left:

{{::shot-2017-05-26_18-21-28.jpg?800|}}

Packages installed and space used, Debian at left:

{{::shot-2017-05-26_18-22-27.jpg?800|}}

As you can see Debian used more space than Devuan and installed one more package.

Status of one service, Debian at left:

{{::shot-2017-05-26_18-40-17.jpg?800|}}

I prefer the output of systemd, but can be confused if you want to get the state in one script. I want to try boot the virtual machines at same time, so I installed NTP, the problem is that always I get a difference of 1 or 2 seconds.

I programmed a crontab in the servers and stay quiet until they reboot, the problem always was that one reboot before than other.

{{::shot-2017-05-26_18-36-59.jpg?800|}}

So I made a trick.

==== The trick ====
I want to boot on time the servers... so I add this line to crontab:
<code>
09 17 * * * echo $(date) > /root/inicio && /sbin/reboot
</code>

I want to eliminate human factor and network latency, so I removed NTP and configure tty1 to auto login.

=== Devuan ===
Modify the file /etc/inittab and comment/change the line:

<code>
1:2345:respawn:/sbin/getty 115200 tty1
</code>

To:

<code>
1:2345:respawn:/bin/login -f pi tty1 </dev/tty1 >/dev/tty1 2>&1
</code>

=== Debian ===
Modify the file /etc/systemd/system/getty.service.wants/getty@tty1.service and comment/change the line:

<code>
ExecStart=-/usr/bin/agetty --noclear %I $TERM
</code>

To:
<code>
ExecStart=-/usr/bin/agetty --autologin root --noclear %I $TERM
</code>

Finally in boot operating systems edit /root/.bashrc and add this line:

<code>
echo $(date) > /root/fin
</code>

==== Results ====

Debian at left:

{{::shot-2017-05-26_19-11-58.jpg?800|}}

Devuan tooks 30 seconds to start, Debian only 16 seconds!


==== References ====
  * https://wiki.archlinux.org/index.php/Getty
  * https://askubuntu.com/questions/168706/how-do-i-auto-login-as-root-into-the-tty-upon-boot