[Kimchi-devel] [RFC] Issue 201 - Kimchi should handle libvirt connection failures

[Paulo Ricardo Paz Vital]

On Apr 27 05:58PM, Aline Manera wrote:
>
>
> On 04/26/2016 06:29 PM, Paulo Ricardo Paz Vital wrote:
> >Today, Kimchi (and Ginger) has a strong dependency with Libvirt, well described
> >in the kimchid.service.{fedora,ubuntu} file that extends the wokd.service
> >configuration to make it dependent of libvirt service. The current configuration
> >stops wokd service automatically if libvirt service is stopped.
> >
> >To prevent wokd to stop automatically if libvirt stops, a new configuration must
> >be set up and loaded, making wokd service still available to user. This is the
> >easiest part to solve this issue.
> >
> >The real issue is that most of the Kimchi operations need to connect to libvirt
> >service and the current implementation, simple stops the cherrypy server if a
> >connection is not available (after 10 seconds trying to connect), causing a
> >"502 bad gateway" error from NGINX. With this implementation from Kimchi, Wok
> >and GingerBase (and Ginger if installed) will not be available to user even
> >though they don't depend on the libvirt service.
> >
> >Basically, the proposal to solve the issue is:
> >
> >1) Modify the kimchid.service.{fedora,ubuntu} files to "reduce" the dependency
> >on libvirt service while wokd is already running - none change will modify the
> >start up dependency; and
> >
> >2) Modify how Kimchi handle the missing libvirt connection to no stop the
> >cherrypy server and provide information to user by Virtualization tab and its
> >sub-tabs, keeping all other plugins enabled and operating.
>
> ACK.
>
> On 2, it would be good to add a notification to user be aware about Kimchi
> is not loaded because libvirt service is not running.
> We can use the /notifications API provided by Wok as this notification can
> be generated any time without having a request behind it.
>

That's exactly what I was thinking to do.  

> >Feel free to make any suggestion. Patches will be submitted by the end of this
> >week.
> >
> >Thanks and best regards,
> >--
> >Paulo Ricardo Paz Vital
> >Linux Technology Center, IBM Systems
> >http://www.ibm.com/linux/ltc/
> >
> >_______________________________________________
> >Kimchi-devel mailing list
> >Kimchi-devel at ovirt.org
> >http://lists.ovirt.org/mailman/listinfo/kimchi-devel
> >
>
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--
Paulo Ricardo Paz Vital
Linux Technology Center, IBM Systems
http://www.ibm.com/linux/ltc/