FortiManager HA cluster startup steps
FortiManager units configured for HA start up begin sending HA heartbeat packets to their configured peer IP addresses and also begin listening for HA heartbeat packets from their configured peer IP addresses.
When the FortiManager units receive HA heartbeat packets with a matching HA cluster ID and password from another from a peer IP address the FortiManager unit assumes the peer is functioning.
When the primary unit is receiving HA heartbeat packets from all of the configured peers or backup units, the primary unit sets the cluster status to up. Once the cluster is up the primary unit then synchronizes its configuration to the backup unit. This synchronization process can take a few minutes depending on the size of the FortiManager database. During this time database and configuration changes made to the primary unit are not synchronized to the backup units. Once synchronization is complete, if changes were made during synchronization, they are resynchronized to the backup units.
Most of the primary unit configuration, as well as the entire FortiManager database, are synchronized to the backup unit. Interface settings and HA settings are not synchronized. These settings must be configured on each cluster unit.
Once the synchronization is complete, the FortiManager HA cluster begins normal operation.
Configuring HA options
To configure HA options go to System Settings > HA. From here you can configure FortiManager units to start an HA cluster or you can change the HA configuration of the cluster.
To configure a cluster, you must set the mode of the primary unit to master and the modes of the backup units to Slave.
Then you must add the IP addresses and serial numbers of each backup unit to primary unit peer list. The IP address and serial number of the primary unit must be added to each of the backup unit HA configurations. Also, the primary unit and all backup units must have the same ClusterID and Group Password.
You can connect to the primary unit Web-based Manager to work with FortiManager. Because of configuration synchronization you can configure and work with the cluster in the same way as you would work with a standalone FortiManager unit.
Configuring options
Configure the following settings:
| Cluster Status | Monitor FortiManager HA status. See Monitoring HA status. |
| Mode | The high availability mode, either Master or Slave. |
| SN | The serial number of the device. |
| IP | The IP address of the device. |
| Enable | Shows if the peer is currently enabled. |
| Status | The status of the cluster member. |
| Module Data Synchronized | Module data synchronized represented in Bytes. |
| Pending Module Data | Pending module data represented in Bytes. |
| Operation Mode | Select Master to configure the FortiManager unit to be the primary unit in a cluster. Select Slave to configure the FortiManager unit to be a backup unit in a cluster. Select Standalone to stop operating in HA mode. |
| Peer IP | Type the IP address of another FortiManager unit in the cluster. For the primary unit you can add up to four Peer IPs for up to four backup units. For a backup unit you add the IP address of the primary unit. |
| Peer SN | Type the serial number of another FortiManager unit in the cluster. For the primary unit you can add up to four Peer serial numbers for up to four backup units. For a backup unit you add the serial number of the primary unit. |
| Cluster ID | A number between 0 and 64 that identifies the HA cluster. All members of the HA cluster must have the same group ID. If you have more than one FortiManager HA cluster on the same network, each HA cluster must have a different group ID.
The FortiManager Web-based Manager browser window title changes to include the Group ID when FortiManager unit is operating in HA mode. |
| Group Password | A password for the HA cluster. All members of the HA cluster must have the same group password. The maximum password length is 19 characters. If you have more than one FortiManager HA cluster on the same network, each HA cluster must have a different password. |
| Heartbeat Interval | The time in seconds that a cluster unit waits between sending heartbeat packets. The heartbeat interval is also the amount of time that a FortiManager unit waits before expecting to receive a heartbeat packet from the other cluster unit. The default heartbeat interval is 5 seconds. The heartbeat interval range is 1 to 255 seconds. You cannot configure the heartbeat interval of the backup units. |
| Failover Threshold | The number of heartbeat intervals that one of the cluster units waits to receive HA heartbeat packets from other cluster units before assuming that the other cluster units have failed. The default failover threshold is 3. The failover threshold range is 1 to 255. You cannot configure the failover threshold of the backup units.In most cases you do not have to change the heartbeat interval or failover threshold. The default settings mean that if the a unit fails, the failure is detected after 3 x 5 or 15 seconds; resulting in a failure detection time of 15 seconds.
If the failure detection time is too short the HA cluster may detect a failure when none has occurred. For example, if the primary unit is very busy it may not respond to HA heartbeat packets in time. In this situation, the backup unit may assume that the primary unit has failed when the primary unit is actually just busy. Increase the failure detection time to prevent the backup unit from detecting a failure when none has occurred. If the failure detection time is too long, administrators will be delayed in learning that the cluster has failed. In most cases, a relatively long failure detection time will not have a major effect on operations. But if the failure detection time is too long for your network conditions, then you can reduce the heartbeat interval or failover threshold. |
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