This project contains tools to facilitate the deployment of Apache ZooKeeper on Kubernetes.
The docker image contained in this repository is comprised of a base Ubuntu 16.04 image using the latest release of the OpenJDK JRE based on the 1.8 JVM and the latest stable release of ZooKeeper, 3.4.10. Ubuntu is a much larger image than BusyBox or Alpine, but these images contain mucl or ulibc. This requires a custom version of OpenJDK to be built against a libc runtime other than glibc. No vendor of the ZooKeeper software supplies or verifies the software against such a JVM, and, while Alpine or BusyBox would provide smaller images, we have prioritized a well known environment.
The image is built such that the ZooKeeper process is designated to run as a non-root user. By default, this user is zookeeper. The ZooKeeper package is installed into the /opt/zookeeper directory, all configuration is sym linked into the /usr/etc/zookeeper/, and all executables are sym linked into /usr/bin. The ZooKeeper data directories are contained in /var/lib/zookeeper. This is identical to the RPM distribution that users should be familiar with.
The makefile contained in the docker directory has three commands.
build command will build the Docker image locally.push command will push the image, provided you have correct permissions,
to grc.io/containers repository.all command will perform the build command.The scripts directory contains useful utilities for managing the ZooKeeper process in a Kubernetes cluster.