Enabling HA

CBH supports the dual-node high availability (HA). After HA is enabled, the secondary node will take over the service if the primary node breaks down.

This topic describes how to enable dual-node HA backup.

Constraints

The primary node must be configured first. After the primary node is configured and the configuration takes effect, configure the secondary node and ensure that the primary and secondary nodes use the internal network for HA synchronization configuration.
After the HA configuration on the secondary node is complete, the historical data is cleared regardless of whether there is configuration data on the secondary node, and the configuration data of the primary node is synchronized to the secondary node.

Prerequisites

You have the management permissions for the System module.
You have prepared two CBH systems and authorized the two CBH systems with the same license.

Procedure

Log in to the CBH system.
Choose System > Sysconfig > HA.

Figure 1 HA
View the HA status. By default, the HA status is Disabled.

If you purchase a primary/standby instance, do not disable HA, or logins to the CBH instance will fail.

Click Enable next to Status.

In the displayed Enable HA dialog box, configure the network information for the primary and secondary nodes.

**Table 1** Parameters for enabling the HA function
Parameter	Description
Initial role	The working status of the node. This parameter can be set to Primary node or Secondary node. You must configure the CBH system that functions as the primary node first.
HA cluster authcode	The value is automatically generated by the system and is used for mutual verification between the primary and secondary nodes. When configuring HA parameters for the primary node, record the verification key of the HA group and configure the parameters for the secondary node accordingly. The value is a string consisting of 8 to 20 digits or letters.
Secondary node IP	When configuring HA parameters for the primary node, enter the IP address of the CBH system that functions as the secondary node.
Primary node IP	When configuring HA parameters for the secondary node, enter the IP address of the CBH system that functions as the primary node.
HA Key	When configuring HA parameters on the primary node, enter the key for mutual authentication between the primary and secondary nodes.
Float IP	Enter an unused IP address that is in the same network range as the fixed IP address of the current CBH instance. A mask must be added to the end of the floating IP address. Logical IP address of the two CBH systems. When you access this IP address, you will automatically log in to one of the CBH systems, usually the primary node.
Float IP Interface	Select the network interface where the fixed IP address of the CBH instance is located.
HA Interface	This interface is the same as that of the floating IP interface.

Click OK and then restart the system for the configuration to take effect.

Effective Conditions

Restart the primary and secondary nodes for the HA configuration to take effect.

Before the restart, the Running Status is Standalone, indicating that the configuration does not take effect.
After the restart, the HA backup cannot take effect until the primary node discovers the IP address of the secondary node and the Running Status of the secondary node changes to Online.