The steps for replacing a Barracuda Load Balancer ADC differ based on whether the system is the Primary or the Secondary device in the cluster.
Note that both Barracuda Load Balancer ADCs in HA must be the same model and on the same firmware.
Replace the Primary System in a High Availability Environment
This section describes the most common scenarios for replacing the Primary system in HA.
Select the scenario that best fits your use case, and complete the associated steps when replacing the Primary system in an HA environment.
Scenario 1. New Replacement Primary Device
Figure 1. New Primary Device Replacement.
Back up the system configuration on the Secondary device.
- Complete the following steps on the Secondary device:
- Log in to the Secondary device, and navigate to the ADVANCED > Backups page.
- In the Manual Backups section, click Backup Now to download a backup to your desktop.
- Install the new replacement Primary device and set the MGMT IP address of your old Primary device to the new Primary device. Verify the new Primary device is on the same firmware version as the existing devices.
- Once the new device is installed, log in to the Primary System, go to the ADVANCED > Backups page, and complete the following steps:
- In the Restore Backups section, click Browse next to Restore From; navigate to and select the configuration backup saved on your desktop.
Click Open or Choose to download the file to your system. The downloaded backup file gets displayed on the top with the details such as Backup Time, Serial#, Model, Firmware and Type.
Click Restore Now to restore the configuration backup file to the Primary device.
- On the Primary device, go to the ADVANCED > High Availability page, and configure all attributes in the exact same manner as those on the Secondary device; the Cluster Shared Secret must match exactly.
- On the Secondary device, navigate to the ADVANCED > High Availability page, and complete the following steps:
- In the Clustered Systems section, delete the IP address of the old Primary device; the system refreshes and wipes out all of the configuration settings.
- Once the device is back online, go to the BASIC > IP Configuration page and set the Default Domain name under Domain Configuration.
Navigate to the ADVANCED > High Availability page, and under Clustered Systems, set the IP address of the Primary device, and click Join Cluster.
Scenario 2. Activate the New Primary Device in an Isolated Network
Figure 2. Isolated Network Environment.
Back up the system configuration on the Secondary device.
- Log in to the Secondary device, and navigate to the ADVANCED > Backups page.
- In the Manual Backups section, click Backup Now to download a backup to your desktop.
- Install the new replacement Primary device in an isolated network, and complete the following steps:
- Go to the ADVANCED > Backups page on the Primary device, and in the Restore Backups section, click Browse next to Restore From.
- Navigate to and select the configuration backup saved on your desktop in step 3 above.
Click Open or Choose to download the file to the Primary device. The downloaded backup file gets displayed on the top with the details such as Backup Time, Serial#, Model, Firmware and Type.
Click Restore Now to restore the configuration backup file to the Primary device.
- Set the MGMT IP address of the old Primary device to the new Primary device.
- Verify the configuration on the new Primary device.
- After verifying the configuration, complete the following at the same time:
- Shutdown the Secondary device, and
- Connect and power up the new Primary device to the production network.
- Put the Secondary device in an isolated network.
- On the Primary device, go to the ADVANCED > High Availability page, and configure all attributes in the exact same manner as those on the Secondary device; the Cluster Shared Secret must match exactly.
- Remove the Secondary device from the cluster by deleting the IP address of the old Primary device from the Clustered Systems section.
- Put the Secondary device back in the production network.
Replace the Secondary System in a High Availability Environment
Figure 3. Secondary System Replacement.
- Remove the old Secondary device using the instructions in the article How to Remove a Barracuda Load Balancer ADC from a High Availability Environment.
Once the new device is installed, follow the steps in the article How to Configure the Barracuda Load Balancer ADC for High Availability to complete the system replacement in the HA configuration.