[Linux-HA] Re: Steps to create a 3 node cluster.

[Andrew Beekhof]

On 11/6/06, Stephen Souness <sounie at hotmail.com> wrote:
> Serge Dubrouski wrote:
> > On 11/6/06, Mc Linux <mrmclinux at gmail.com> wrote:
> >> Hi!
> >>
> >> Now I know that I have to use cib.xml to configure a three node cluster.
> >>
> >> I migrated my old-style haresources file with haresources2cib.py...
> >>
> >> But how can I add thing like this:
> >>
> >> <rsc_location id="location_named" rsc="named_id">
> >>                 <rule id="prefered_location_named" score="100">
> >>                     <expression attribute="#uname" operation="eq"
> >> value="pluto"/>
> >>                 </rule>
> >>                 <rule id="prefered_location_named" score="-INFINITY">
> >>                     <expression attribute="#uname" operation="eq"
> >> value="mars"/>
> >>                 </rule>
> >>    </rsc_location>
> >>
> >> Becouse if I edit the cib.xml by hand and after I start the cluster it
> >> will overwrite it...
> >
> > It wouldn't if you didn't make mistakes in your XML. Always use
> > crm_verify after such updates. But you can use GUI or cibadmin tools
> > to make changes in cib.xml.
>
> I think that a perfectly valid addition to cib.xml could be overwritten
> or ignored by heartbeat - as the md5 checksum of the cib.xml file will
> no longer match with the information that has previously been stored in
> cib.xml.sig

It wont be overwritten - but neither will any changes that are done
the "proper way" be saved to disk either.

>
> If you want to edit that file by hand, then one ugly way of going about
> it is to stop all nodes in the cluster, choose one node to apply the
> changes to, remove the cib.xml.sig file on that node before restarting
> it and remove cib.xml, cib.xml.sig (and maybe cib.xml.last) from all
> other nodes in the cluster.  Then restart the node that has the changes
> first (so it should become the Cluster Resource Manager), followed by
> the other nodes which should request the cib.xml from the Cluster
> Resource Manager.
>
> As the others said, the cleaner way of updating the cib.xml is by using
> the cibadmin command.
>
>
> --
> Stephen
>
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