[Linux-cluster] Testing Failover - Failing in few cases

[Satya Daragani]

Hi Linux-Cluster Team,

Please help me in testing the failover with the RHEL Cluster Suite 4 with
update 4. I am appending the details related to cluster nodes and
configuration here. Kindly suggest me how to proceed further.


IBM Lenovo Thinkcentre with AMD Opteron 64bit processor - Two nodes

256 MB RAM

One NIC



   1. Installed RHEL AS 4 Update 4 on both the nodes
   2. Configured NIC with IP range 192.168.1.x (node1 – 192.168.1.1,
   node2 – 192.168.1.2)
   3. Configured /etc/hosts.
   4. Installed the RHEL cluster suite 4 update 4 on both nodes.
   5. Added both the nodes in the cluster manager with one quorum vote
   6. No fence devices configured (chkconfig --del fenced)
   7. Restricted & ordered by priority (node1 – 1, node -2) level
   failover domain configured.
   8. Shared IP address (192.168.1.5) resource is configured and enabled
   the monitor link option.
   9. Created a service with the name httpd and configured the following
      1. Checked the Autostart this service
      2. Selected the failover domain configured in the previous
      steps.
      3. Selected the Relocate as the recovery policy
      4. Added the shared resource (IP created in the above steps),
      under this shared resource added the private resource
      script(/etc/rc.d/init.d/httpd).



Checking the failover:

1st case

After configuring the above, now node1 is the primary node for the httpd
service.

If I restart the node1 the service is failed over to the node2, and once the
node1 comes up again the service is failing over to the node1 (as the
priority is configured)



2nd case

Currently node1 is running the httpd service, if I down the network
interface (ifconfig eth0 down), the httpd service is failing over to the
node2.

Then if I up the interface (ifconfig eth0 up) on node1, the service is not
failovering to the node1 and in the /var/log/messages it is saying "unable
to contact the cluster infrastructure". *Need your help here*



If I restart the cluster services on the node1 again the service is getting
started on the node1.



3rd case

Currently node1 is running the HTTPd service, if I remove the powercord (I
mean the improper shutdown), the service is going to the recovery mode and
not getting started on the node2. *Need your help here.*



4th case

Currently node1 is running the httpd service, if I stop or killall the httpd
service (service httpd stop) failover is not happening. *Need your help
here.*

 --
Thanx
Satya Daragani
satya.daragani at gmail.com
+91 98850 58366
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