Re: clustered web service using Apache resource?
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On Thu, Nov 17, 2011 at 1:02 AM, <Ralph.Grothe@xxxxxxxxxxxxxx> wrote: >> -----Original Message----- >> From: linux-cluster-bounces@xxxxxxxxxx >> [mailto:linux-cluster-bounces@xxxxxxxxxx] On Behalf Of Liam Forbes >> Sent: Wednesday, November 16, 2011 21:36 >> To: linux-cluster@xxxxxxxxxx >> Subject: clustered web service using Apache resource? >> >> Hello, >> >> I've set up a 5 node cluster using RHEL 6.1 and the HA & Resilient >> Storage add-ons, with one service group (so far) containing an IP >> address resource and an Apache resource. The service is working fine, >> but only on the first node (which happens to be where luci is >> running). > > What does a "clustat" issued on the node where the resource is > active display? [lforbes@hatest1 ~]$ sudo clustat Cluster Status for hatest @ Tue Nov 15 16:17:54 2011 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ hatest1-m 1 Online, Local, rgmanager hatest2-m 2 Online, rgmanager hatest3-m 3 Online, rgmanager hatest4-m 4 Online, rgmanager hatest5-m 5 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:bbtest hatest1-m started > Can clustat be issued on the other nodes (especially those which > are part of the failover domain of the service that the apache > resource belongs to) as well? Yes. >> All the /etc/cluster/cluster.conf files match, but I only >> see the /etc/cluster/apache directory on that node. > > That sounds queer to me. > Usually such a directory doesn't exist. > Is that where you have your shared storage (LV/GFS), i.e. fs > resource, of your webserver service mounted? No. It appears to be created when a service with the Apache resource is started on a node. > I would rather choose a different mountpoint. > But I seem to understand why you want to mount it in that place. > You only want to keep one central httpd.conf file I guess? No, I'm developing individual httpd.conf files, but they will all reside in the same GFS2 filesystem (/datafs). > In the shell see "clusvcadm -h" for usage info. > You could also relocate from the shell by something like e.g. > > # clusvcadm -r <name_of_your_webserver_service> -m > <name_of_a_node_from_your_failover_domain> > > From another shell terminal you could follow the relocation > progress by e.g. > > # clustat -i3 I tried a `clusvcadm -r -m` this morning. And it works. [lforbes@hatest1 ~]$ sudo clusvcadm -r bbtest -m hatest4-m Trying to relocate service:bbtest to hatest4-m...Success [lforbes@hatest1 ~]$ sudo clustat Cluster Status for hatest @ Thu Nov 17 10:13:04 2011 Member Status: Quorate Member Name ID Status ------ ---- ---- ------ hatest1-m 1 Online, Local, rgmanager hatest2-m 2 Online, rgmanager hatest3-m 3 Online, rgmanager hatest4-m 4 Online, rgmanager hatest5-m 5 Online, rgmanager Service Name Owner (Last) State ------- ---- ----- ------ ----- service:bbtest hatest4-m started So it appears that using the drop down menu in Conga to select a node and relocate the service to that node as part of a restart is not working. When I do that, the service just restarts on whatever node it's already running on (and it's very obvious in the rgmanager log file). The drop down menu isn't being honored. > I would assume because the RHCS apache RA is taylored at the > httpd RPM from the RHEL repository. > As said, I'm not using the apache RA so far. > But I encountered a similar issue with the RHCS tomcat RA. > Because our customer wished a special Tomcat release build with > different paths, starting/stopping scripts, environment etc. it > would have been much more work to adapt the RHCS tomcat RA to > those special needs than providing an own script RA script. I am using the Red Hat httpd RPM. But I see your point and it makes sense. Maybe a little more documentation on the intended use, and how to use, each resource agent in the Cluster Administration guide would be very helpful for newbs like myself. -- Regards, -liam -There are uncountably more irrational fears than rational ones. -P. Dolan Liam Forbes HPC Systems Analyst, HPC&S Group Leader, CISSP ARSC, U of AK, Fairbanks lforbes@xxxxxxxx 907-450-8618 fax: 907-450-8605 -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster