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Docker Image

The docker image contained in this repository is comprised of a base Ubuntu 18.04 image using the latest release of the OpenJDK JRE based on the 1.8 JVM and the latest stable release of ZooKeeper, 3.5.9. 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.

Makefile

The makefile contained in the docker directory has three commands.

  • The build command will build the Docker image locally.
  • The push command will push the image to emresaglam's repo. Change this to your repo.
  • The all command will perform the build command.

The scripts directory contains useful utilities for managing the ZooKeeper process in a Kubernetes cluster.