Applies To:Show Versions
- 11.5.10, 11.5.9, 11.5.8, 11.5.7, 11.5.6, 11.5.5, 11.5.4, 11.5.3, 11.5.2, 11.5.1
Overview: Adding a BIG-IP GTM system to a GTM synchronization group
You can configure BIG-IP Global Traffic Manager (GTM) systems in collections called GTM synchronization groups. All BIG-IP GTM systems in the same GTM synchronization group have the same rank, exchange heartbeat messages, and share probing responsibility.
Configuration changes to one device in a GTM synchronization group are synchronized incrementally across the devices in the group. That is, only the data that has changed on a GTM device is synchronized to the other devices in the group. Although incremental synchronization is the default behavior, if an incremental synchronization fails, the system automatically performs a full configuration synchronization.
When you add a BIG-IP (GTM) system to a network that contains older BIG-IP GTM systems, the devices can exchange heartbeat messages, even though the BIG-IP software versions are different. However, to add a GTM to a configuration synchronization group, you must run the gtm_add script.
Task SummaryWhen adding a BIG-IP GTM to a network that already contains BIG-IP GTM systems in a synchronization group, perform the following tasks.
Enabling synchronization on the existing GTM
Decide to which GTM synchronization group you want to add the GTM system. Make certain that at least one previously-configured GTM belongs to that GTM synchronization group.
- On the Main tab, click The General configuration screen opens. .
- Select the Synchronize check box.
- In the Group Name field, type the name of the synchronization group to which you want this system to belong.
In the Time Tolerance field, type the maximum number of seconds
allowed between the time settings on this system and the other systems in the
The lower the value, the more often this system makes a log entry indicating that
there is a difference.Tip: If you are using NTP, leave this setting at the default value of 10. In the event that NTP fails, the system uses the time_tolerance variable to maintain synchronization.
- Click Update.
Creating a data center on the existing GTM
- On the Main tab, click The Data Center List screen opens. .
- Click Create. The New Data Center screen opens.
In the Name field, type a name to identify the data
Important: The data center name is limited to 63 characters.
- In the Location field, type the geographic location of the data center.
- In the Contact field, type the name of either the administrator or the department that manages the data center.
- From the State list, select Enabled or Disabled. The default is Enabled, which specifies that the data center and its resources are available for load balancing.
- Click Finished.
Defining a server on the existing GTM
- On the Main tab, click The Server List screen opens. .
- Click Create. The New Server screen opens.
In the Name field, type a name for the server.
Important: Server names are limited to 63 characters.
- From the Product list, select BIG-IP System (Single). The server type determines the metrics that the system can collect from the server.
In the Address List area, add the IP address of the server.
Important: You must use a self IP address for a BIG-IP system; you cannot use the management IP address.
- From the Data Center list, select the data center where the server resides.
From the Virtual Server Discovery list, select how you
want virtual servers to be added to the system.
Option Description Disabled The system does not use the discovery feature to automatically add virtual servers. This is the default value. Use this option for a standalone GTM system or for a GTM/LTM combo system when you plan to manually add virtual servers to the system, or if your network uses multiple route domains. Enabled The system uses the discovery feature to automatically add virtual servers. Use this option for a GTM/LTM combo system when you want the GTM system to discover LTM virtual servers. Enabled (No Delete) The system uses the discovery feature to automatically add virtual servers and does not delete any virtual servers that already exist. Use this option for a GTM/LTM combo system when you want the GTM system to discover LTM virtual servers.
In the Virtual Server List area, if you selected
Disabled from the Virtual Server
Discovery list, specify the virtual servers that are resources
on this server.
- In the Name field, type the name of the virtual server.
- In the Address field, type the IP address of the virtual server.
- From the Service Port list, select the port the server uses.
- Click Add.
- Click Create. The Server List screen opens displaying the new server in the list.
Running the gtm_add script
- Log in as root to the GTM system you are adding to your network.
- Run this command to access tmsh. tmsh
Run this command to run the gtm_add script
run gtm gtm_add
- Press the y key to start the gtm_add script.
- Type the IP address of the GTM system in the synchronization group to which you are adding this GTM system.
- Press Enter.
- If prompted, type the root password.
- Press Enter.