Novell LINUX ENTERPRISE 11 - HIGH AVAILABILITY, Manual, Page: 144 / 298

Check if the communication channels and options configured in
/etc/ais/
openais.conf
are the same for all cluster nodes.
In case you use encrypted communication, check if the
/etc/ais/authkey
file is available on all cluster nodes.
Does the firewall allow communication via the
mcastport
?
If the mcastport used for communication between the cluster nodes is blocked by
the firewall, the nodes cannot
see
each other. When configuring the initial setup
with YaST as described in Section 3.1, “Installing the High Availability Extension”
(page 23), the firewall settings are usually automatically adjusted.
To make sure the mcastport is not blocked by the firewall, check the settings in
/etc/sysconfig/SuSEfirewall2
on each node. Alternatively, start the
YaST firewall module on each cluster node. After clicking Allowed Service > Ad-
vanced, add the mcastport to the list of allowed UDP Ports and confirm your
changes.
Is OpenAIS started on each cluster node?
Check the OpenAIS status on each cluster node with
/etc/init.d/openais
status
. In case OpenAIS is not running, start it by executing
/etc/init.d/openais start
.
15.2 “Debugging” a HA Cluster
Troubleshooting your cluster. The following displays for you the resource operation
history (option
-o
) and inactive resources (
-r
):
crm_mon -o -r
The display is refreshed every 10 seconds (you can cancel it with Ctrl + C .) An example
could look like:
134 High Availability Guide