2.2. Creating a Cluster with the pcsd Web UI

From the Manage Clusters page, you can create a new cluster, add an existing cluster to the Web UI, or remove a cluster from the Web UI.
  • To create a cluster, click on Create New and enter the name of the cluster to create and the nodes that constitute the cluster. You can also configure advanced cluster options from this screen, including the transport mechanism for cluster communication, as described in Section 2.2.1, “Advanced Cluster Configuration Options”. After entering the cluster information, click Create Cluster.
  • To add an existing cluster to the Web UI, click on Add Existing and enter the host name or IP address of a node in the cluster that you would like to manage with the Web UI.
Once you have created or added a cluster, the cluster name is displayed on the Manage Cluster page. Selecting the cluster displays information about the cluster.

Note

When using the pcsd Web UI to configure a cluster, you can move your mouse over the text describing many of the options to see longer descriptions of those options as a tooltip display.

2.2.1. Advanced Cluster Configuration Options

When creating a cluster, you can click on Advanced Options to configure additional cluster options, as shown in Figure 2.2, “Create Clusters page”. For information about the options displayed, move your mouse over the text for that option.
Note that you can configure a cluster with Redundant Ring Protocol by specifying the interfaces for each node. The Redundant Ring Protocol settings display will change if you select UDP rather than the default value of UDPU as the transport mechanism for the cluster.
Create Clusters page

Figure 2.2. Create Clusters page

2.2.2. Setting Cluster Management Permissions

There are two sets of cluster permissions that you can grant to users:
  • Permissions for managing the cluster with the Web UI, which also grants permissions to run pcs commands that connect to nodes over a network. This section describes how to configure those permissions with the Web UI.
  • Permissions for local users to allow read-only or read-write access to the cluster configuration, using ACLs. Configuring ACLs with the Web UI is described in Section 2.3.4, “Configuring ACLs”.
For further information on user permissions, see Section 4.5, “Setting User Permissions”.
You can grant permission for specific users other than user hacluster to manage the cluster through the Web UI and to run pcs commands that connect to nodes over a network by adding them to the group haclient. You can then configure the permissions set for an individual member of the group haclient by clicking the Permissions tab on the Manage Clusters page and setting the permissions on the resulting screen. From this screen, you can also set permissions for groups.
You can grant the following permissions:
  • Read permissions, to view the cluster settings
  • Write permissions, to modify cluster settings (except for permissions and ACLs)
  • Grant permissions, to modify cluster permissions and ACLs
  • Full permissions, for unrestricted access to a cluster, including adding and removing nodes, with access to keys and certificates