zookeeper 3.3.5+dfsg1-1ubuntu1 (amd64 binary) in ubuntu precise

 ZooKeeper is a centralized, reliable, service for maintaining configuration
 information, naming, providing distributed synchronization, and group
 services. All of these kinds of services are used in some form or another by
 distributed applications.
 .
 This package contains the shell scripts and an example configuration but does
 not automatically start up the service. The example configuration is installed
 with the update-alternatives mechanism.