The packages needed for configuring and managing a cluster are included in the High Availability installation pattern, available with the High Availability Extension.

Check if High Availability Extension is installed as an add-on to SUSE Linux Enterprise Server 11 on each of the cluster nodes and if the High Availability pattern is installed on each of the machines as described in Section 3.1, “Installing the High Availability Extension”.

In order to communicate with each other, all nodes belonging to the same cluster need to use the same bindnetaddr, mcastaddr and mcastport as described in Section 3.2, “Initial Cluster Setup”.

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.

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”, 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+Advanced, add the mcastport to the list of allowed UDP Ports and confirm your changes.

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.