[ClusterLabs] Insert delay between the statup of VirtualDomain

[Oscar Segarra]

Hi,

Yes,

Database server can be considered started up when it accepts mysql client
connections
Applications server can be considered started as soon as the listening port
is up al accepting connections

¿Can you provide any example about how to achieve this?

Thanks a lot.


2017-02-25 19:35 GMT+01:00 Dejan Muhamedagic <dejanmm at fastmail.fm>:

> Hi,
>
> On Thu, Feb 23, 2017 at 08:51:20PM +0100, Oscar Segarra wrote:
> > Hi,
> >
> > In my environment I have 5 guestes that have to be started up in a
> > specified order starting for the MySQL database server.
> >
> > I have set the order constraints and VirtualDomains start in the right
> > order but, the problem I have, is that the second host starts up faster
> > than the database server and therefore applications running on the second
> > host raise errors due to database connectivity problems.
> >
> > I'd like to introduce a delay between the startup of the VirtualDomain of
> > the database server and the startup of the second guest.
>
> Do you have a way to check if this server is up? If so...
> The start action of VirtualDomain won't exit until the monitor
> action returns success. And there's a parameter called
> monitor_scripts (see the meta-data). Note that these programs
> (scripts) are run at the supervisor host and not in the guest.
> It's all a bit involved, but should be doable.
>
> Thanks,
>
> Dejan
>
> > ¿Is it any way to get this?
> >
> > Thanks a lot.
>
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