[Users] disable getty start for Debian 8 with systemd

[CoolCold]

Hello!

On Mon, May 4, 2015 at 8:54 AM, Scott Dowdle <dowdle at montanalinux.org>
wrote:

> Greetings,
>
> ----- Original Message -----
> > Just installed Debian 8 "Jessie" in VE. Used almost the same template
> > creation script as for Squeeze and started cleaning some things up.
> >
> > One particular thing I've noted is agetty processes being started for
> > tty{1..6} via systemd. Some lurking and asking on #systemd at freenode
> > revealed several possibly solutions:
> > 1) completely disable (note that you should use "mask" command) the
> > service, like:
> > systemctl mask getty-static.service
> > 2) use conditional in Unit definition
> > /lib/systemd/system/getty-static.service
> > ConditionVirtualization=!openvz
> >
> > (i'd suggest to use ConditionVirtualization=!lxc for LXC too)
>
> On #2 I don't think you want to edit the package provided service file as
> that could get replaced with an update.  I think you can copy it to
> /etc/systemd/service/ and make changes there... or at least I believe
> that's how it is supposed to work.  I would think #1 would be a better
> solution.
>
For now i'm doing masking on template creation (
https://github.com/CoolCold/openvz-tools/blob/master/templating/prep-jessie.sh#L94
) , so using #1

>
> > So, knowledge is shared, now the question part.
> >
> > 1) to OpenVZ devs - are there any chances ttys (except console) may
> > be needed?
>
> I don't think so... but even if one is started, it shouldn't really use up
> much resources.  I believe they are actually started on demand if and when
> one switches over to a virtual console.
>
About resources:
root at ddiburatest:~# ps -eo  'rsz,command'|grep getty
  856 /sbin/agetty --noclear tty2 linux
  892 /sbin/agetty --noclear --keep-baud console 115200 38400 9600 vt102
  844 /sbin/agetty --noclear tty3 linux
  844 /sbin/agetty --noclear tty4 linux
  856 /sbin/agetty --noclear tty5 linux
  848 /sbin/agetty --noclear tty6 linux

so once instance is eating something like 900kb of RAM (resident size),
though I don't see any difference from free -m output after stopping them.
about on demand: From what I see, it is not started on demand as A) there
is no any switch to other virtual consoles by hand B) i've checked on
VMware VM - and I clearly see it has been dynamically activated when i use
alt+ctrl+f1/f2..
And anyway, it isn't needed, so why consume resources?


>
> > 2) to Ola Lundqvist , what do you think, is it worth to fill the bug
> > to Debian's systemd package?
>
> It doesn't seem like a bug to me.
>
I'm thinking about this as enhancement, not a but here, just filling via
standard Debian bugs report interface.

>
> TYL,
> --
> Scott Dowdle
> 704 Church Street
> Belgrade, MT 59714
> (406)388-0827 [home]
> (406)994-3931 [work]
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>



-- 
Best regards,
[COOLCOLD-RIPN]
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