Creating high availability groups

You can create or update high availability (HA) groups to provide highly available access to the services on Admin Nodes or Gateway Nodes.

Before you begin

About this task

A node must meet the following conditions to be included in an HA group:
  • The node must be a Gateway Node or an Admin Node.
  • The node must have a Grid Network or Client Network interface within the current virtual IP subnet to be included in an existing HA group.
  • The Grid Network interface or Client Network interface of the node must be configured with fixed or static IP addressing (not DHCP).

Steps

  1. Select Configuration > High Availability Groups.
    The High Availability Groups page appears.
    HA Groups Main Screen
  2. Click Create.
    The Create High Availability Group dialog box appears.
  3. Type a name and, if desired, a description for the HA group.
  4. Click Select Interfaces.
    The Add Interfaces to High Availability Group dialog box appears. The table lists interfaces for eligible nodes.
    HA Groups Add Interfaces

    A node does not appear in the list if the node's IP address is assigned by DHCP.

  5. Select the check box to the left of the interface you want to add to the HA group.
    Note the following guidelines for selecting interfaces:
    • You must select at least one interface.
    • If you select more than one interface, all of the interfaces must be on either the Grid Network (eth0) or on the Client Network(eth2). All interfaces must be in the same subnet.
    • You must only select interfaces on nodes that can support the services you need:
      • Only Admin Nodes provide access to the Grid Manager or the Tenant Manager.
      • Both Admin Nodes and Gateway Nodes provide access to the Load Balancer service.
      • Only Gateway Nodes provide access to the legacy CLB service.

      If you select both Admin Node and Gateway Node interfaces, the HA group can only provide high availability for the Load Balancer service.

  6. Click Apply.
    The interfaces you selected are listed in the Interfaces section of the Create High Availability Group page. By default, the first node in the list is selected as the Preferred Master.
  7. If you want a different node to be the preferred Master, select that node in the Preferred Master column.
    The preferred Master hosts the active interface unless a failure occurs that causes the active interface to move to another node.
    Note: You must select the primary Admin Node as the preferred Master if the HA group provides access to the Grid Manager. Some maintenance procedures can only be performed from the primary Admin Node.
  8. Enter one or more virtual IP addresses for the HA group. Click Plus Sign for each IP address you want to add.
    You must provide at least one IPv4 address, in addition to any IPv6 addresses that you specify.

    IPv4 addresses must be within all of the IPv4 subnets of the member nodes. That is, if the subnets of the member nodes overlap, you must select an IP address from the overlapping set.


    HA Groups Select Virtual IPs
  9. Click Save.
    The HA Group is created.
  10. As needed, create additional HA groups, edit an existing HA group, or remove an HA group.
    If you want to decommission a node in an HA group, you must first remove the node from the HA group.
    Attention: If you remove an HA group, S3 and Swift clients will not be able to communicate through any of the HA group's virtual IP addresses.