Apache Zookeeper
Apache ZooKeeper is a centralized service required for clustering.
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Apache ZooKeeper is a critical part of the clustering architecture. You must use ZooKeeper Version 3.4.6 or later to maintain and synchronize group services in the CloudBees Flow cluster. CloudBees Flow includes a tool called ZKConfigTool, which you can use to populate ZooKeeper quickly with CloudBees Flow configuration information.
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Exhibitor can be used with ZooKeeper to monitor the synchronization between the ZooKeeper nodes. This software is not required to implement a CloudBees Flow cluster configuration, but can provide instance monitoring, backup, recovery, cleanup and visualization services. See the Exhibitor documentation at https://github.com/Netflix/exhibitor.
Load Balancer
You must use a load balancer in a CloudBees Flow cluster. You can use any load balancer or load-balancing software for a cluster as long as the load balancer acts as an SSL endpoint and supports returning HTTP redirections.
| Transport Layer Security (TLS) has replaced Secure Sockets Layer version 3.0 (SSLv3) on the CloudBees Flow server and the CloudBees Flow web server. |