Re: [Xen-users] domU dependency-aware xendomains init script?

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

John Morris wrote:
> Is there a smarter xendomains script out there that deals with domU 
> dependencies better than the one in the RPMs (CentOS)?
> For example, directory services (eg. LDAP, DNS) are on one domU, and 
> other domUs depend on those services to boot correctly.  (Best to 
> solve this with redundant services, yes, but let's say this is a test 
> network.)  An even stranger example is a domU whose root boots from an 
> NFS, iSCSI or AoE filesystem on another domU.
That's not a Xen issue: that's an OS issue. As such, the init scripts of 
the other DomU's could perform a number of checks to see if the services 
are enabled yet, in theory, but I'd suggest instead a monitoring system 
such as Nagios that reports the confused state of the systems and 
reports *that*.
> It would also be nice, for example, to have per-domU settings for 
> shutdown (hibernate or init 0?).
> This idea is still in a seed stage, so I'm not expressing it very 
> clearly.  Any pointers to similar-sounding information, though, are 
> well appreciated.  Thanks-
Well, there you'd have to get into the "xendomain" init script that 
RedHat uses. It's an interesting idea: the information could 
theoretically be contained in a standard Xen init script, and even 
reported to the Xen configurations for migration. But in the short term, 
a sinple text-file with domain names and shutdown states could be 
stuffed in /etc/sysconfig/ or /etx/xen/ for exactly this sort of use.
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