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Manual Chapter: Adding a new BIG-IP GTM to a GTM Synchronization Group
Manual Chapter
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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.

BIG-IP                 GTM systems in a synchronization group BIG-IP GTM systems in a GTM synchronization group

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 Summary

When 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

Ensure that the BIG-IP GTM references your NTP servers.

Decide to which GTM synchronization group you want to add the BIG-IP GTM. Ensure that at least one previously-configured BIG-IP GTM belongs to that GTM synchronization group.

To ensure that the BIG-IP GTM that is already installed on your network can share configuration changes with other BIG-IP GTM systems that you add to the GTM synchronization group, enable synchronization on the system.
  1. On the Main tab, click System > Configuration > Global Traffic > General. The General configuration screen opens.
  2. Select the Synchronization check box.
  3. In the Synchronization Time Tolerance field, type the maximum number of seconds allowed between the time settings on this system and the other systems in the synchronization group. 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.
  4. In the Synchronization Group Name field, type the name of the synchronization group to which you want this system to belong.
  5. Click Update.
When a change is made on one BIG-IP GTM in the GTM synchronization group, that change is automatically synchronized to the other systems in the group.

Creating a data center on the existing GTM

Create a data center on the existing BIG-IP GTM system to represent the location where the new BIG-IP GTM system resides.
  1. On the Main tab, click Global Traffic > Data Centers. The Data Center List screen opens.
  2. Click Create. The New Data Center screen opens.
  3. In the Name field, type a name to identify the data center.
    Important: The data center name is limited to 63 characters.
  4. In the Location field, type the geographic location of the data center.
  5. In the Contact field, type the name of either the administrator or the department that manages the data center.
  6. Click Finished.

Defining a server on the existing GTM

Ensure that a data center where the new BIG-IP GTM system resides exists in the configuration of the existing BIG-IP GTM system.
Define a new server, on the existing BIG-IP GTM, to represent the new BIG-IP GTM system.
  1. On the Main tab, click Global Traffic > Servers. The Server List screen opens.
  2. Click Create. The New Server screen opens.
  3. In the Name field, type a name for the server.
    Important: Server names are limited to 63 characters.
  4. From the Product list, select BIG-IP System (Single). The server type determines the metrics that the system can collect from the server.
  5. 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.
  6. From the Data Center list, select the data center where the server resides.
  7. 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 BIG-IP GTM or for a BIG-IP GTM/LTM combo system when you plan to manually add virtual servers to the system, or if your network utilizes multiple route domains.
    Enabled The system uses the discovery feature to automatically add virtual servers. Use this option for a BIG-IP GTM/LTM combo system when you want BIG-IP GTM to discover BIG-IP 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 BIG-IP GTM/LTM combo system when you want BIG-IP GTM to discover BIG-IP LTM virtual servers.
  8. Click Create. The Server List screen opens displaying the new server in the list.
The status of the newly defined BIG-IP GTM system is Unknown , because you have not yet run the gtm_add script.

Running the gtm_add script

Determine the self IP address of a BIG-IP GTM in the GTM synchronization group to which you want to add another BIG-IP GTM.
Run the gtm_add script on the BIG-IP GTM system you are adding to your network to acquire the configuration settings from a BIG-IP GTM system that is already installed on your network.
Note: You must perform this task from the command-line interface.
  1. Log in as root to the BIG-IP GTM system you are adding to your network.
  2. Run this command to access tmsh. tmsh
  3. Run this command to run the gtm_add script run gtm gtm_add
    1. Press the y key to start the gtm_add script.
    2. Type the IP address of the BIG-IP GTM in the synchronization group to which you are adding this BIG-IP GTM
    3. Press Enter.
    4. If prompted, type the root password.
    5. Press Enter.
The BIG-IP GTM system you are installing on your network acquires the configuration of the BIG-IP GTM system already installed on your network.

Implementation result

The new BIG-IP GTM that you added to the network is a part of a GTM synchronization group. Changes you make to any system in the GTM synchronization group are automatically propagated to all other systems in the group.

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