Re: [Xen-users] how to start VMs in a particular order

[Joost Roeleveld <joost@xxxxxxxxxxxx>]

On Wednesday 02 July 2014 00:03:21 lee wrote:
> Simon Hobson <linux@xxxxxxxxxxxxxxxx> writes:
> > Eg, just looking on a random box, ntp has this section :
> >> ### BEGIN INIT INFO
> >> # Provides:        ntp
> >> # Required-Start:  $network $remote_fs $syslog
> >> # Required-Stop:   $network $remote_fs $syslog
> >> # Default-Start:   2 3 4 5
> >> # Default-Stop:
> >> # Short-Description: Start NTP daemon
> >> ### END INIT INFO
> > 
> > Change Required-Start to be "$network $remote_fs $syslog $wait_for_dns",
> > rerun the init-script setup, and then you have a system that would pause
> > for the DNS to be available before it started the ntp service.
> You'd also have to specify which other hosts to notify and which of all
> the hosts need to wait for which others.
> 
> Think it further, and you might want something like a daemon running
> somewhere which receives information from all hosts about which services
> they have started and tells hosts what to start next.  You'd have a
> central place to specify all the dependencies, only one file to edit
> and to rule them all.
> 
> Once you have that, you might want the daemon to monitor the hosts and
> tell you when a service is down or something else goes wrong.
> 
> Something like a meta-systemd ...

Nope, please don't have that added to systemd as well.
Investigate Monit or Puppet. Those already do it that way.

--
Joost

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