Manually disabling communication between multiple cells

We can complete a set of steps to manually disable the overlay communication between multiple cells.

Typically, you enable the overlay communication between multiple cells when you configure multi-cell performance management in a star topology. Each cell contains a overlaynodes.config file, and the files must be copied between the cells to enable multi-cell performance management. We can manually disable the overlay communication by completing the steps in this topic. Alternatively, we can run the unlinkCells script, which is described in another topic, to disable the overlay communication.

For example, assume set up a star topology in which three cells are running, and to disable communication between certain cells without disrupting service to the other cells in the environment. CellA is the center cell, and CellB, and CellC are the point cells. Complete the following procedure to manually disable communication between CellA and CellB while maintaining communication between CellA and CellC.

1. Copy the overlaynodes.config file from the deployment manager of CellB to a deployment manager temporary directory on CellA. For example, copy the file to the /tmp/CellB_overlaynodes.config directory. The overlaynodes.config file is in the WAS_HOME/profiles/deployment_manager_profile_name/config/cells/cell_name directory of each cell.

2. Run the importOverlayConfig.py script from the deployment manager on CellA. Specify the path to the temporary directory in which you saved the overlaynodes.config file of CellB.
   WAS_HOME/bin/wsadmin.sh -lang jython -f ./importOverlayConfig.py unlink /tmp/CellB_overlaynodes.config

3. Copy the overlaynodes.config file from the deployment manager of CellA to a deployment manager temporary directory on CellB. For example, copy the file to the /tmp/CellA_overlaynodes.config directory.

4. Run the importOverlayConfig.py script from the deployment manager on CellB. Specify the path to the temporary directory in which you saved the overlaynodes.config file of CellA.
   WAS_HOME/bin/wsadmin.sh -lang jython -f ./importOverlayConfig.py unlink /tmp/CellA_overlaynodes.config

5. Optional: If security is enabled, we might need to delete the security certificates that were exchanged when the cells were linked together.

   1. Log on to the console of CellA, and delete the security certificate of CellB. Click Security > SSL certificate and key management > Key stores and certificates > CellDefaultTrustStore.

   2. Select Signer certificates from the list of Additional properties. A new panel is displayed.

   3. Select the signer certificate for the remote cell, and click Delete.

   4. Save and synchronize the changes.

   5. Log on to the console of CellB, and repeat the steps to delete the security certificate of CellA.

6. Delete the CenterCell custom property from each cell.

   1. In the console of CellA, click System administration > Cell > Custom properties.

   2. Select the CenterCell custom property, and click Delete.

   3. Save and synchronize the changes.

   4. Log on to the console of CellB, and repeat the steps to delete the CenterCell custom property from CellB.

Related tasks

Configure elasticity mode

Configure multi-cell performance management: Star Topology

Intelligent Management: scripts

unlinkCells|unlinkCellsZOS script

Intelligent Management: custom properties