Global Load Balancing : Configuring the global pool
 
Configuring the global pool
The DNS global pool configuration includes the pool of virtual servers that are available to DNS policies. You can build a pool list from the following sources:
• Local—A local virtual server is a FortiADC virtual server that is configured on the local system. Select a local virtual server from the list to add it to the pool. The system gets the IP address for local virtual servers from this configuration.
• Remote—A remote virtual server is a FortiADC virtual server that is configured on another system. If you add a remote virtual server, specify its IPv4/IPv6 type and IP address.
• Self-defined—Use the self-defined server configuration if the FortiADC system uses 1-to-1 NAT. In those deployments, you want to publish the external address, not use the address from the virtual server configuration. You can also use the self-defined configuration to add the IPv4/IPv6 type and IP address for a non-FortiADC server.
Before you begin:
• You must have completed the virtual server configuration. See “Configuring virtual servers”.
• You must have knowledge of any remote virtual servers that are available to the global deployment.
• You must have Read-Write permission for Global DNS Load Balance settings.
After you have configured a pool, you can select it when you add A/AAAA records to a DNS zone configuration.
To configure a pool:
1. Go to Global DNS Server > Global DNS Policy.
2. Click the Load Balance Pool tab.
3. Click Add to display the configuration editor, give the configuration a name, and save.
4. Complete the configuration and add members as described in Table 30.
5. Save the configuration.
 
Table 30: Virtual server pool configuration
Settings
Guidelines
Name
Unique name. No spaces or special characters.
After you initially save the configuration, you cannot edit the name.
Member
Address Source
• Self Defined—Use the self-defined server configuration if the FortiADC system uses 1-to-1 NAT. In that deployment, you want to publish the external address, not use the address from the virtual server configuration. You can also use the self-defined configuration to add the IPv4/IPv6 type and IP address for a non-FortiADC server.
• Local Virtual Server—A local virtual server is a FortiADC virtual server that is configured on the local system. Select a local virtual server from the list to add it to the pool. The system gets the IP address for local virtual servers from this configuration.
• Remote Virtual Server—A remote virtual server is a FortiADC virtual server that is configured on another system. If you add a remote virtual server, specify its IPv4/IPv6 type and IP address.
Weight
Assigns relative preference among members—higher values are more preferred and are assigned connections more frequently.
The default is 1. The valid range is 1-255.
Self-Defined
Address Type
• IPv4
• IPv6
Address
Specify the IP address of a virtual server to add it to the pool.
Link Group
If you add a link group to the configuration, the system uses it to perform a health check. If the link group is not available, the system excludes the virtual server from the DNS load balancing distribution. This behavior applies only to pools with local virtual servers or self-defined virtual servers.
Link Member
Like link group, but only the health of a link member is polled. Specify the name of gateway to serve as a beacon for the health check. The string must match the configured name of the link member.
Local Virtual Server
Local Virtual Server Name
If you select the local source option, select a virtual server. Virtual servers that you add can be the targets for the DNS zone RR.
Link Group
If you add a link group to the configuration, the system uses it to perform a health check. If the link group is not available, the system excludes the local virtual server from the DNS load balancing distribution. This behavior applies only to pools with local virtual servers or self-defined virtual servers.
Link Member
Like link group, but only the health of a link member is polled. Specify the name of gateway to serve as a beacon for the health check. The string must match the configured name of the link member.
Remote Virtual Server
Address Type
• IPv4
• IPv6
Address
Specify the IP address of a virtual server to add it to the pool.