Product Documentation

Automatically update

Apr 22, 2013
The Enable auto update of Controllers policy setting is located in the Virtual Delivery Agent category.
  • To enable auto-update, enable the Enable auto update of Controllers policy setting. This setting is enabled by default.
  • To disable auto-update, disable the Enable auto update of Controllers policy setting.

When auto-update is enabled and you install a Virtual Delivery Agent (VDA), the VDA attempts to register with one of the Delivery Controller values you specified when you installed the VDA. The installer writes the Controller information you specify during VDA installation to the ListOfDDCs registry value.

After the VDA registers, the Controller with which it registered sends a list of the current Controller Fully Qualified Domain Names (FQDNs) and Security IDs (SIDs) to the VDA. The VDA writes this list to the auto-update persistent storage. Each Controller also checks the Site Configuration Database every 90 minutes for Controller information – if a Controller has been added or removed since the last check, or if a policy change has occurred, the Controller sends updated lists to its registered VDAs. The VDA will accept connections from all the Controllers in the most recent list it received.

If a VDA receives a list that does not include the Controller it is registered with (in other words, that Controller was removed from the Site), the VDA re-registers, choosing among the Controllers in the list. After a VDA registers or re-registers, it receives an updated list.

For example:
  1. A deployment has three Controllers: A, B, and C. A VDA is installed and registers with Controller B (which was specified during VDA installation).
  2. Two Controllers (D and E) are added to the Site. Within 90 minutes, VDAs receive updated lists and will accept connections from Controllers A, B, C, D, and E. (The load will not be spread equally to all Controllers until the VDAs are restarted.)
  3. Controller B is removed from the Site. Within 90 minutes, VDAs receive updated lists because there has been a Controller change since the last check. The VDA installed in step 1 is registered with Controller B, which is no longer on the list, so that VDA re-registers, choosing among the Controllers in the current list (A, C, D, and E).