Administration Guide › Agents › How to Protect Agents from Impact of Server IP Address Changes › Ensure Availability of Servers During Reassignment of Static IP Addresses

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Ensure Availability of Servers During Reassignment of Static IP Addresses

If you install the CA Enterprise Log Manager servers with static IP addresses and later plan to renumber them, use the following workflow to ensure continuous high availability to the agents with these servers on their ordered lists. It is not necessary to restart the agent after any step since the agent refreshes its configuration information every 5 minutes by default.

Important! If the agent is configured with only one CA Enterprise Log Manager server in a multi-server system, be sure to add a second server to the ordered list before assigning new IP addresses. If this is not done, you may need to reinstall and reconfigure the agent after the server IP address assignment to reinstate the server's availability.

To ensure that agents can reach a CA Enterprise Log Manager server on their ordered list during a reassignment of static IP addresses to servers

  1. If planning IP address reassignment to a CA Enterprise Log Manager server where that server is the only CA Enterprise Log Manager, install a temporary CA Enterprise Log Manager that points to the CA EEM on the original CA Enterprise Log Manager.
  2. If one or more additional CA Enterprise Log Manager servers have not be configured for any agents in a multi-server system, assign at least one additional server to the ordered list.
    1. Select Agent Explorer and click Log Manager Servers.

      The Assign Log Manager Server wizard appears with the Select Targets step selected.

    2. Select Agents or Groups, depending on how you make such assignments.
    3. Select the affected agents or groups as targets from the Available list and move them to the Selected list.
    4. Click the Select Log Manager Servers step.
    5. Select a CA Enterprise Log Manager from the Available list and move it to the Selected list.
    6. Click Save and Close.
  3. Remove half of the ordered list of CA Enterprise Log Manager servers from the agent or agent group configuration using the Assign Log Manager Server wizard.
  4. Assign the new static IP addresses to those servers you removed from the selected list.
  5. Re-add the servers with the new IP addresses.
  6. Wait for the agent to refresh its configuration information.

    Note: You can manually restart the agent to refresh the information immediately.

  7. Remove the other half of the ordered list.

    Note: In the case where you added a temporary server, you can retain it for failover purposes or you can uninstall it and then delete it.

  8. Reassign those IP addresses.
  9. Re-add those servers to restore the original ordered list.

More information:

How to Configure Agent Management

Delete a Service Host