[Spacewalk-list] Spacewalk in multiple data centers

[Paul Robert Marino]

On Sat, Apr 27, 2013 at 9:13 AM, Grant Gainey <ggainey at redhat.com> wrote:

> Hi Stefan,
>
> In general, I think you've hit the salient points.  Comments inline.
>
> ----- Original Message -----
> > Hello world,
> >
> > are there any "best practice" documents for deploying Spacewalk
> > servers to multiple data centers in a way that clients will
> > load-balance and failover on their own? I think there are a number of
> > challenges here:
> >
> > 1. The actual loadbalancing of HTTP(S) requests. That should be easy
> >    to handle. Some care should be taken WRT certificates, but that
> >    shouldn't be a major problem.
>
> Aye, pretty well-understood issues here.
>
> > 2. The (Oracle) database. Should be pretty easy to, set up a physical
> >    standby and if the primary fails, switchover to the standby
> >    instance, promote it, edit rhn.conf, restart Spacewalk servers.
>
> Sure, sounds reasonable.
>
> > 3. Actually getting the RPM files from one server to the other -
> >    rsync'ing them seems like the safest bet.
>
> Don't forget about cobbler's data.

> 4. Taskomatic tasks - this one seems like the only real challenge: We
> >    don't want both spacewalk servers to e.g. scheduele automatic
> >    errata updates, or send reports.
>
> Yeah, you only want one taskomatic running, for that very reason.  And
> anything taskomatic does to/from disk (like, say, cobbler-syncing) will
> only be on disks available to the instance where taskomatic is running.
>
> > Did I miss anything important here? Has anyone already done a setup
> > like this and would like to share his/her experience?
>
> If you're looking at redundancy in the same DC, then fast disk shared by
> all instances keeps your disk-data in sync automatically.
>
> If you actually mean "different data centers", then you'll have to get
> that dealt with - as you say, rsync or something like it.
>

I use Gluster for this with synchronous local (in datacenter) replication
and asynchronous geo replication to warm spares in a DR site.


> I don't know that we have anything formal written up around this - maybe
> someone else will chime in...
>
>
Yes there is documentation on this for RHN Satellite and the instructions
work for Spacewalk.

https://access.redhat.com/site/documentation/en-US/Red_Hat_Network_Satellite/5.5/html/Installation_Guide/sect-Installation_Guide-Maintenance-Establishing_Redundant_Satellites_with_Stand_Alone_DB.html



> Grant
>
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