[Debian-ha-maintainers] Bug#862248: Bug#862248: No straightforward and permanent way to disable DRBD autostart, no drbd systemd unit file

[Christian Balzer]

Hello,

On Wed, 10 May 2017 15:18:15 +0300 Apollon Oikonomopoulos wrote:

> On 20:55 Wed 10 May     , Christian Balzer wrote:
> > is there any package you're not involved with? ^o^  
> 
> Nah, we just happen to be running the same things :)
>
Evidently so. ^o^
 
> > On Wed, 10 May 2017 12:37:34 +0300 Apollon Oikonomopoulos wrote:
> >   
> > > Control: severity -1 wishlist
> > >  
> > Sure thing.
> >    
> > > Hi,
> > > 
> > > On 17:53 Wed 10 May     , Christian Balzer wrote:  
> > > > Jessie (backports), systemd.
> > > > 
> > > > When running DRBD with pacemaker it is recommended (and with systemd
> > > > required, see link below) to disable DRBD startup at boot time.
> > > > 
> > > > However:
> > > > ---
> > > > # systemctl disable drbd
> > > > drbd.service is not a native service, redirecting to systemd-sysv-install.
> > > > Executing: /lib/systemd/systemd-sysv-install disable drbd
> > > > insserv: warning: current start runlevel(s) (empty) of script `drbd' overrides LSB defaults (2 3 4 5).
> > > > insserv: warning: current stop runlevel(s) (0 1 2 3 4 5 6) of script `drbd' overrides LSB defaults (0 1 6).
> > > > ---
> > > > 
> > > > But since systemd-sysv picks up anything in /etc/init.d/ we get after a
> > > > reboot:
> > > > ---
> > > > # systemctl status drbd
> > > >   drbd.service - LSB: Control drbd resources.
> > > >    Loaded: loaded (/etc/init.d/drbd; generated; vendor preset: enabled)
> > > >    Active: active (exited) since Wed 2017-05-10 10:37:39 JST; 6h ago
> > > >      Docs: man:systemd-sysv-generator(8)
> > > >    CGroup: /system.slice/drbd.service
> > > > ---
> > > > 
> > > > Ways forward would be a unit file for systemd that actually allows disable
> > > > to work as expected or some other means to (permanently) neuter the init.d
> > > > file (instead of an "exit 0" at the top which did the trick for now).    
> > > 
> > > Thanks for the report!
> > > 
> > > You can always use `systemctl mask drbd.service', which will neuter the 
> > > initscript completely. I'm downgrading the severity to 'wishlist', 
> > > unless `systemctl mask' causes some ill side-effects, in which case 
> > > please change the severity again.
> > >   
> > That worked w/o any ill effects I can see.
> > 
> > Unfortunately mask is not a particular well known/referenced systemctl
> > feature, but then again that might be my tremendous love and admiration
> > for all things systemd speaking. ^o^  
> 
> mask is well-documented, it's just something we didn't have with 
> sysvinit, so most people ignore its existence and it's not cited often.
> 
> >   
> > > But yes, ideally we should provide a native unit.
> > >   
> > I wonder if this bears referencing to the systemd/systemd-sysv folks, to
> > maybe suggest "mask" in the output when somebody runs disable against a
> > LSB sysv init script.   
> 
> The thing is, systemctl disable *should* do the right thing, even in 
> jessie. It makes me suspect there are some older package left-overs 
> around. Can you please try running:
> 
>  $ systemctl disable drbd.service
>  $ systemctl daemon-reload
>  $ find /lib/systemd /run/systemd /etc/systemd -name drbd.service
> 

Firstly I recreated the initial state bu unmasking drbd and enabling it,
then reloading systemd.

That find then gives us:
---
/run/systemd/generator.late/drbd.service
/etc/systemd/system/multi-user.target.wants/drbd.service
---

These systems are an upgrade from Wheezy, but there are no old packages
left and the relevant bits (drbd and systemd) are actually from backports.


Christian
-- 
Christian Balzer        Network/Systems Engineer                
chibi at gol.com   	Global OnLine Japan/Rakuten Communications
http://www.gol.com/