[Linux-cluster] help wanted configuring services
linux-cluster at merctech.com
linux-cluster at merctech.com
Mon Oct 6 23:59:01 UTC 2008
Is it possible to set up a hierarchy of services, in the same way that a
service is made up of individual resources?
I'm trying to set up a clustered web server using RHCS 5 on CentOS 5.2, with
the latest versions from the "upstream provider's" production release.
The cluster provides several web applications, each of which has it's own
resources that Apache doesn't need to know about directly. Each application
relies on Apache as a presentation layer. I don't want to make the individual
applications' dependencies separate resources within a single "Apache" service,
because that makes management difficult.
For example, is it possible to create a structure like:
Service: Apache
Private Resource: IP address
Private Resource: GFS Vol1
Shared Service: Wiki
Shared Service: SVN
Shared Service: Calendar
Service: Wiki
Private Resource: GFS Vol2
Private Resource: MySQL "wiki" instance
Service: SVN
Private Resource: MySQL "svn" instance
Private Resource: GFS Vol3
Service: Calendar
(no resources beyond apache)
Note that resources like "GFS Vol2" and "MySQL wiki instance" are assigned
to the "Wiki" service, not directly to the "Apache" service. The Apache
service sees "Wiki" as a resource.
With this kind of structure, I could administratively disable the "Wiki" service
without causing the other web applications to restart or relocate. However, if a
resource that the Wiki requires fails on the active web server (for example, GFS
Vol 2), the the standard failover policy would apply...the Wiki service would
restart and if that is unsuccessful, then the Apache service (and it's
dependencies--Wiki, SVN, Calendar, IP address, GFS Vol1) would relocate.
Is there any way to set up this kind of structure with RHCS?
Thanks,
Mark
-----
Mark Bergman
http://wwwkeys.pgp.net:11371/pks/lookup?op=get&search=bergman%40merctech.com
More information about the Linux-cluster
mailing list