An existing cluster added to RHEL 6 luci is showing "Status unknown" for the Status.

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux Server 5 (with the High Availability Add Ons)
  • Red Hat Enterprise Linux Server 6 (with the High Availability Add Ons)
  • The luci host is running RHEL 6.
  • The ricci hosts can be running RHEL 5 or RHEL 6.

Issue

  • An existing cluster added to RHEL 6 luci is showing Status unknown for the Status.
  • Luci shows unknown Status

Resolution

There is no way to edit the cluster that was added showing Status unknown for the Status since the cluster nodes cannot be contacted, so that cluster will need to be deleted. After the cluster is deleted, then proceed with adding the cluster as an existing cluster, but this time change the Ricci Hostname to a hostname that can be resolved by the luci host.

Root Cause

There are two names that are entered when a cluster is added or created and each has a specific purpose:

  • Node Name: This is the name of this particular node as it appears in the /etc/cluster/cluster.conf.
  • Ricci Hostname: This is an alternate name that can be used to communicate with the 'luci host. If the cluster node is configured with a dedicated private network that is used only for cluster traffic(and the luci host cannot not communicate on that network), then set the Ricci hostname to a hostname that luci can communicate with.

In this instance there was two network devices used for communication.

  • eth0: Public Interface
  • eth1: Private Interface used for cluster communication(and interface that is resolved with cluster node name)

When an existing cluster was added cluster node name was entered into both fields: Node Name and Ricci Hostname. When the luci host tried to get the status of the cluster nodes it fails because luci could not resolve the Ricci Hostname that was entered.

Diagnostic Steps

  • Get sosreports from the cluster nodes that are being added and the luci host.
  • Find out the values for the fields: Node name and Ricci Hostname

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