[Lxc-users] regarding lxc "states" available to lxc-monitor or lxc-wait usage

[Vallevand, Mark K]

I don't think signals to the container init process is the answer.  You can run a single program in a container.  When that program reaches a certain state, it could report that it is operational.  I don't know what the correct way to do that report using a new lxc feature.

Currently, my program creates a file that indicates it is operational.  My container start-up code looks for that file before it assumes that the container is ready.


Regards.
Mark K Vallevand   Mark.Vallevand at Unisys.com
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-----Original Message-----
From: Guido Jäkel [mailto:G.Jaekel at DNB.DE] 
Sent: Thursday, May 09, 2013 10:10 AM
To: Serge Hallyn; lxc-users
Subject: Re: [Lxc-users] regarding lxc "states" available to lxc-monitor or lxc-wait usage

>> *Say I have a container app and I want to know when it has finished some
>> initialization task it would be great to be able to somehow utilize
>> lxc-monitor or to use lxc-wait in a script that looked for my "private
>> state" to be reported and then take some further action or initiate some
>> other activity.*
> 
> This reminds me of discussions in years past about 'service readiness'
> indication (i.e. for upstart).

Yes, it would be usefull if the container may signal to the host that the startup is finished and all services should have been started.


> I'm not sure how userspace in the container would go about informing the
> monitor of the new state.  Any ideas?

May one send signals to the container's init process?

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