Quick Tech Tip – Upgrading Clustered Zen Load Balancers

Zen Load Balancer 3.7 [Link] is out as of September 23, 2015 running on Debian v8.x and there’s a good possibility many are running Zen LBS with Debian v7.x or even as old as v6.x. In some scenarios it is possible to execute a dist-upgrade but many custom installations will not upgrade properly due to differences in system and application configuration files between Debian versions. There are a several methods to accomplish the task of upgrading Zen LBS, but this is the preferred method to ensure all interfaces and farms are configured correctly and the original master remains the master at the completion of the upgrade. Downtime is required for this procedure and don’t forget to backup the systems and files before starting!

1) On the secondary node disable clustering.
2) Shutdown the master node.
3) Create a new node with the same number of NICs and attach to the same VLANs.
4) Replace the old MAC addresses in the routing table or DHCP server with the new MAC addresses of each NIC.
5) Start the new node and install the latest version of Zen Load Balancer [Link].
6) From the original secondary node, re-establish clustering with the original master node with the new version of Zen LBS installed. All virtual interfaces and farms will be automatically configured on the master.
7) On the master node, disable clustering.
8) Shutdown the original secondary node.
9) Create a new node with the same number of NICs and attach to the same VLANs.
10) Replace the old MAC addresses in the routing table or DHCP server with the new MAC addresses of each NIC.
11) Start the new node and install the latest version of Zen Load Balancer [Link].
12) From the original master node, re-establish clustering with the original secondary node with the new version of Zen LBS installed. All virtual interfaces and farms will be automatically configured on the secondary. If everything was completed correctly, that’s it!

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