[Users] 'vzctl start CTID --wait' hangs

[Kir Kolyshkin]

On 01/13/2014 01:20 AM, Roman Haefeli wrote:
> On Wed, 2014-01-08 at 23:57 -0800, Kir Kolyshkin wrote:
>> On 01/08/2014 08:36 AM, Roman Haefeli wrote:
>>> Hi
>>>
>>> When I start Debian 7 containers with the '--wait' option, it does start
>>> the CT, but the vzctl command never returns. The same works fine with
>>> Debian 6 containers.
>>>
>>> I figured that 'vzctl start CTID --wait' usually adds a line to the
>>> CT's /etc/inittab:
>>>
>>> vz:2345:once:touch /.vzfifo
>>>
>>> However, such a line is never added to Debian 7 CTs. On Debian 6 CTs,
>>> this line is automatically added whenever the CT is started, even if it
>>> has been removed manually.
>>>
>>> A work-around is to add the line manually to /etc/inittab, but I still
>>> wonder why the automatism doesn't work for Debian 7 CTs.
>>>
>> Please file a bug for vzctl, I will take a look soon.
> Thanks for addressing this issue. In your notes on bugzilla

[ Just for the sake of people reading it: https://bugzilla.openvz.org/2859 ]

>   you mention
> that the original reason for the hangs is the missing lo interface.

Yes, this is what I found with the official Debian 7 templates (that I 
will fix soon).

>   In
> fact, on the CT I tested lo was configured properly and up and running.
>
> I should mention that I made the template myself according to the
> instructions found here [1].

Hey, this makes it a perfect example of how to NOT file bug reports! ;-)

>   When you mentioned the scripts
> in /etc/init/ I found that all our flawlessly running Debian 6 CTs don't
> have this folder at all. I removed it completely also in the Debian 7 CT
> and from then on I was able to start it flawlessly with the --wait flag.

Good that you have mentioned it, now I see that /etc/init existence doesn't
mean we have upstart, so we have to patch /etc/inittab regardless.

Will fix vzctl accordingly soon.

>
> I wonder about two things:
> * How important are those scripts in /etc/init, considering that I was
> running Debian CTs for years without them?

This is standard upstart directory. Upstart can be used used instead of 
sysvinit.
Google for debian upstart for more details.

> * How did that folder /etc/init sneak into my self-made Debian 7
> template?

Perhaps dpkg -S can shed some light? I observe this
on one of my Debian boxes (not running upstart):

root at kir-deb71-ovz:~# dpkg -S /etc/init
sysvinit-utils, ifupdown, udev: /etc/init


>   /etc/init/ isn't a standard path in Debian.

Apparently it is (if you choose to use upstart).