Public | Automated Build

Last pushed: 2 years ago
Short Description
Automated ZK ensemble configuration using consul-template. See README.
Full Description

Overview

This project creates a docker-based Zookeeper container that
supports dynamically changing the enemble configuration based
on consul service discovery. This allows you to spin up and
modify ZK ensembles quickly.

Warning! This is a test of consul-template. Don't use for anything important at this time, as we haven't tested various failure scenarios.

Features

  • Uses consul-template to dynamicaly write zoo.cfg and restart Zookeeper
  • Supplies environment variables for registrator for service discovery
  • Configurable via environment variables passed to container
  • Supports docker-assigned ports for client, peer and leaders (you can run multiple zookeepers on the same machine without port conflicts)
  • Will generate random ZKIDs if one is not provided
  • Supports tagging for use with registrator and consul service discovery

Running

From the command line

  • Ensure that consul is running. We recommend using the instructions from docker-consul. The container should be named consul

  • Ensure that registrator is running:
    ```docker run -d \

     -v /var/run/docker.sock:/tmp/docker.sock \
     -h $HOSTNAME progrium/registrator```
    
  • Optional: configure dnsmasq to use consul for DNS. See http://www.morethanseven.net/2014/04/25/consul/

  • Run ./start_container.sh

  • If you want to use Consul DNS instead of container linking, replace the --link consul:consul line in the script with a CONSUL_CONNECT pointing to the dns name of the consul system

###Environment variables

Variable Default Description
CONSUL_CONNECT consul:8500 DNS name of consul server. If using dnsmasq + consul you can use consul.service.consl instead and pass --dns=127.0.0.1 when starting the container
CONSUL_MINWAIT 20s Consul template minimum wait
CONSUL_MAXWAIT 60s Consul template maximum wait
CONSUL_QUERY ${CONSUL_SERVICE} if ${CONSUL_TAG} is defined the default will be ${CONSUL_TAG}.${CONSUL_SERVICE} Consul template query. For example, set the tag & service name to have consul template look for systems like: cluster1.zookeeper
CONSUL_SERVICE zookeeper Consul Service discovery name
CONSUL_TAG Not defined Consul Service discovery tag
ZOO_LOG_DIR ${ZK_LOG_DIR} log4j zookeeper.out file location
ZK_DATA_DIR /var/lib/zookeeper location of Zookeeper data
ZK_LOG_DIR /var/log/zookeeper location of Zookeeper dataLog
ZK_HOME /opt/zookeeper Zookeeper install directory
ZK_ID 1 Zookeeper serverid

##License
This software is released under an Apache 2.0 License

Copyright Asteris, LLC 2014

Docker Pull Command
Owner
asteris
Source Repository