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Processes Job state updates from Travis Worker, as well as enqueuing Jobs.
Ruby Shell
Branch: master

What is Travis Hub

Travis Hub collects build logs, state changes and other information from Travis workers, then updates build logs in the database, propagates messages to browsers via Pusher, detects finished builds, delivers email and IRC notifications, bakes you a pizza and walks your dog.



Travis Hub communicates with other applications using RabbitMQ (via Hot Bunnies). Please refer to amqp gem's Getting Started guide to learn how to install RabbitMQ on your platform, we won't duplicate all that information here.

After you have RabbitMQ running, use


to create a separate RabbitMQ vhost (travis.development) for travis as well as one user (travis_hub) for Hub. You can instead use any other vhost or username but this script matches what's in the example configuration file.

JRuby and libraries

Travis Hub is JRuby-based. Make sure you have Sun or OpenJDK 6, install JRuby via RVM (or any other way) and then do

bundle install

Hub uses travis-core and travis-support that evolve rapidly, so keep your eye on those two.

Deploying on Heroku

Heroku will detect the JRuby version from the Gemfile. The following JAVA_OPTS may be set for a typical deployment:

heroku config:add JAVA_OPTS="-Xmx768m -Xss512k -XX:+UseCompressedOops -Dfile.encoding=UTF-8"


Primary database used by is PostgreSQL and Hub uses it extensively. While we use 9.0 in production, 8.4 and 9.1 will work just as well.

The schema required by hub lives over in travis-core and can be created by running migrations in that project.


Hub uses multiple services that require configuration. It loads configuration from config/travis.yml and keeps configs for all environments (development, test, production) in one file under different keys:

  # development configuration goes here

  # test configuration goes here

  # staging configuration goes here

  # production configuration goes here

Find a sample travis.yml file under config/travis.example.yml, copy it and edit it to match your system.

Running Hub

To run Hub in the foreground, use

bin/hub solo

There are two modes: Either a single process handling everything, or a one dispatcher, multiple workers setup:

bin/hub dispatcher 2
bin/hub worker 1
bin/hub worker 2

Scaling up and down

When scaling down, keep in mind to first let the queue drain before killing off workers.

On Heroku, scaling works like this:

heroku config:set DYNO_COUNT=2
heroku ps:scale solo=0 dispatcher=1:2x worker=2:2x

Disabling Features

Quite often during development you want to disable things like email delivery and Pusher notifications. Hub lets you do that by removing certain listeners in the configuration file:

  domain: travis-ci.local
    - worker
    - pusher
    - email
    - irc
    - webhook
    - campfire
    - archive

To disable Pusher, email and IRC notifications, just remove several lines like this:

  domain: travis-ci.local
    - worker
    - webhook
    - campfire
    - archive

Worker listener

This is the only listener that is not optional. It processes build configuration messages and publishes one or more build requests (think matrix rows) to workers. In real world scenarios this listener cannot be left out.

Pusher listener

Propagates messages to browsers using Pusher. Often disabled during development.

Email listener

Delivers email notifications. Usually disabled during development.

IRC listener

Delivers IRC notifications. Usually disabled during development.

Web Hooks listener

Delivers Web hooks notifications, a la GitHub hooks. Usually disabled during development.

Campfire listener

Delivers Campfire notifications. Usually disabled during development.

Archive listener

Proactively archives build logs & other information to a separate data store. Usually disabled during development.


See the file for information on how to contribute to travis-hub. Note that we're using a central issue tracker for all the Travis projects.

License & copyright information

See LICENSE file.

Copyright (c) 2011-2013 Travis CI development team.

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