Table of Contents

• Zookeeper
  • Usage
    • Resources
      • zookeeper
    • discover_zookeepers
  • Errata
  • Author and License

Zookeeper

Zookeeper is a coordination and discovery service maintained by the Apache Software Foundation.

This cookbook focuses on deploying Zookeeper via Chef.

Usage

This cookbook is primarily a library cookbook. It implements a zookeeper resource to handle the installation and configuration of Zookeeper. It ships with a default recipe for backwards compatibility pre-LWRP which will work fine, but is really just an example.

Use the "install" recipe to install the binaries, but perform no further actions.

Resources

This cookbook ships with one resource, with future plans for two more covering service management and configuration rendering.

zookeeper

The zookeeper resource is responsible for installing and (eventually) uninstalling Zookeeper from a node.

Actions: :install, :uninstall

Parameters:

• version: Version of Zookeeper to install (name attribute)
• user: The user who will eventually run Zookeeper (default: 'zookeeper')
• mirror: The mirror to obtain Zookeeper from (required)
• checksum: Checksum for the Zookeeper download file
• install_dir: Which directory to install Zookeeper to (default: `'/opt/zookeeper')

Example:

zookeeper '3.4.6' do
  user     'zookeeper'
  mirror   'http://www.poolsaboveground.com/apache/zookeeper'
  checksum '01b3938547cd620dc4c93efe07c0360411f4a66962a70500b163b59014046994'
  action   :install
end

zookeeper_config

This resource renders a Zookeeper configuration file. Period-delimited parameters can be specified either as a flat hash, or by embeddeding each sub-section within a separate hash. See the example below for an example.

Actions: :render, :delete

Parameters:

• user: The user to give ownership of the file to (default: zookeeper)
• config: Hash of configuration parameters to add to the file
• path: Path to write the configuration file to.

Example:

config_hash = {
  clientPort: 2181, 
  dataDir: '/mnt/zk', 
  tickTime: 2000,
  autopurge: {
    snapRetainCount: 1,
    purgeInterval: 1
  }
}

zookeeper_config '/opt/zookeeper/zookeeper-3.4.6/conf/zoo.cfg' do
  config config_hash
  user   'zookeeper'
  action :render
end

discover_zookeepers

This cookbook comes with a library to help your other cookbooks discovery the members of your ZooKeeper ensemble. Call it with the host of (one) of your exhibitors. We use round-robin dns so it would look like

> discover_zookeepers("http://exhibitor.example.com:8080")
{"servers":["10.0.1.0","10.0.1.1","10.0.1.2"],"port":2181}

for details on the response format, see https://github.com/Netflix/exhibitor/wiki/REST-Entities under Servers

Errata

• Version 1.4.7 on the community site is in fact version 1.4.8.

Author and License

Simple Finance ops@simple.com Apache License, Version 2.0