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2.4. Configuring a High Availability pcsd Web UI
When you use the
pcsd Web UI, you connect to one of the nodes of the cluster to display the cluster management pages. If the node to which you are connecting goes down or becomes unavailable, you can reconnect to the cluster by opening your browser to a URL that specifies a different node of the cluster. It is possible, however, to configure the pcsd Web UI itself for high availability, in which case you can continue to manage the cluster without entering a new URL.
To configure the
pcsd Web UI for high availability, perform the following steps.
- Ensure that
PCSD_SSL_CERT_SYNC_ENABLEDis set totruein the/etc/sysconfig/pcsdconfiguration file, which is the default value in RHEL 7. Enabling certificate syncing causespcsdto sync thepcsdcertificates for the cluster setup and node add commands. - Create an
IPaddr2cluster resource, which is a floating IP address that you will use to connect to thepcsdWeb UI. The IP address must not be one already associated with a physical node. If theIPaddr2resource’s NIC device is not specified, the floating IP must reside on the same network as one of the node’s statically assigned IP addresses, otherwise the NIC device to assign the floating IP address cannot be properly detected. - Create custom SSL certificates for use with
pcsdand ensure that they are valid for the addresses of the nodes used to connect to thepcsdWeb UI.- To create custom SSL certificates, you can use either wildcard certificates or you can use the Subject Alternative Name certificate extension. For information on the Red Hat Certificate System, see the Red Hat Certificate System Administration Guide.
- Install the custom certificates for
pcsdwith thepcs pcsd certkeycommand. - Sync the
pcsdcertificates to all nodes in the cluster with thepcs pcsd sync-certificatescommand.
- Connect to the
pcsdWeb UI using the floating IP address you configured as a cluster resource.
Note
Even when you configure the
pcsd Web UI for high availability, you will be asked to log in again when the node to which you are connecting goes down.
