OpenStack Storage (Swift)
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api-ref/source Use https instead of http for Feb 7, 2017
bin Fix swift-get-nodes arg parsing for missing ring Feb 6, 2017
doc Typo fix: curent => current Feb 7, 2017
etc Deprecate broken handoffs_first in favor of handoffs_only Feb 14, 2017
examples Add a user variable to templates Sep 17, 2013
install-guide/source Use https instead of http for Feb 7, 2017
releasenotes 2.13.0 authors/changelog updates Feb 16, 2017
swift Merge "Deprecate broken handoffs_first in favor of handoffs_only" Feb 15, 2017
test Merge "Deprecate broken handoffs_first in favor of handoffs_only" Feb 15, 2017
.alltests Apply bash error handling consistently in all bash scripts Oct 11, 2016
.coveragerc Fix .coveragrc to prevent nose tests error Sep 21, 2015
.functests Merge "Apply bash error handling consistently in all bash scripts" Oct 14, 2016
.gitignore Add .eggs/* to .gitignore Mar 22, 2016
.gitreview Add .gitreview config file for gerrit. Oct 24, 2011
.mailmap 2.13.0 authors/changelog updates Feb 16, 2017
.manpages Script for checking sanity of manpages Feb 10, 2016
.probetests Allow specify arguments to .probetests script Dec 24, 2013
.testr.conf Fix func test --until-failure and --no-discover options Dec 16, 2015
.unittests Fix coverage report for newer versions of coverage Apr 24, 2014
AUTHORS 2.13.0 authors/changelog updates Feb 16, 2017
CHANGELOG 2.13.0 authors/changelog updates Feb 16, 2017
CONTRIBUTING.rst Rework the contributor docs May 6, 2016
LICENSE Convert LICENSE to use unix style line endings. Dec 19, 2012 Fix locale directory in May 19, 2016
README.rst Show team and repo badges on README Nov 25, 2016
REVIEW_GUIDELINES.rst added a quote Jan 5, 2017
babel.cfg add pybabel commands and initial .pot Jan 27, 2011
bandit.yaml Updating Bandit config file Sep 16, 2016
bindep.txt Add python3-dev to bindep and use py27for some envs Dec 12, 2016
requirements.txt Update pyeclib dependency to 1.3.1 Oct 6, 2016
setup.cfg modify the home-page info with the developer documentation Jul 29, 2016 taking the global reqs that we can May 21, 2014
test-requirements.txt adding reno sphinx tree Nov 10, 2016
tox.ini remove func-fast-post from tox.ini Jan 25, 2017


Team and repository tags


A distributed object storage system designed to scale from a single machine to thousands of servers. Swift is optimized for multi-tenancy and high concurrency. Swift is ideal for backups, web and mobile content, and any other unstructured data that can grow without bound.

Swift provides a simple, REST-based API fully documented at

Swift was originally developed as the basis for Rackspace's Cloud Files and was open-sourced in 2010 as part of the OpenStack project. It has since grown to include contributions from many companies and has spawned a thriving ecosystem of 3rd party tools. Swift's contributors are listed in the AUTHORS file.


To build documentation install sphinx (pip install sphinx), run python build_sphinx, and then browse to /doc/build/html/index.html. These docs are auto-generated after every commit and available online at

For Developers

Getting Started

Swift is part of OpenStack and follows the code contribution, review, and testing processes common to all OpenStack projects.

If you would like to start contributing, check out these notes to help you get started.

The best place to get started is the "SAIO - Swift All In One". This document will walk you through setting up a development cluster of Swift in a VM. The SAIO environment is ideal for running small-scale tests against swift and trying out new features and bug fixes.


There are three types of tests included in Swift's source tree.

  1. Unit tests
  2. Functional tests
  3. Probe tests

Unit tests check that small sections of the code behave properly. For example, a unit test may test a single function to ensure that various input gives the expected output. This validates that the code is correct and regressions are not introduced.

Functional tests check that the client API is working as expected. These can be run against any endpoint claiming to support the Swift API (although some tests require multiple accounts with different privilege levels). These are "black box" tests that ensure that client apps written against Swift will continue to work.

Probe tests are "white box" tests that validate the internal workings of a Swift cluster. They are written to work against the "SAIO - Swift All In One" dev environment. For example, a probe test may create an object, delete one replica, and ensure that the background consistency processes find and correct the error.

You can run unit tests with .unittests, functional tests with .functests, and probe tests with .probetests. There is an additional .alltests script that wraps the other three.

Code Organization

  • bin/: Executable scripts that are the processes run by the deployer
  • doc/: Documentation
  • etc/: Sample config files
  • examples/: Config snippets used in the docs
  • swift/: Core code
    • account/: account server
    • cli/: code that backs some of the CLI tools in bin/
    • common/: code shared by different modules
      • middleware/: "standard", officially-supported middleware
      • ring/: code implementing Swift's ring
    • container/: container server
    • locale/: internationalization (translation) data
    • obj/: object server
    • proxy/: proxy server
  • test/: Unit, functional, and probe tests

Data Flow

Swift is a WSGI application and uses eventlet's WSGI server. After the processes are running, the entry point for new requests is the Application class in swift/proxy/ From there, a controller is chosen, and the request is processed. The proxy may choose to forward the request to a back- end server. For example, the entry point for requests to the object server is the ObjectController class in swift/obj/

For Deployers

Deployer docs are also available at A good starting point is at

There is an ops runbook that gives information about how to diagnose and troubleshoot common issues when running a Swift cluster.

You can run functional tests against a swift cluster with .functests. These functional tests require /etc/swift/test.conf to run. A sample config file can be found in this source tree in test/sample.conf.

For Client Apps

For client applications, official Python language bindings are provided at

Complete API documentation at

There is a large ecosystem of applications and libraries that support and work with OpenStack Swift. Several are listed on the associated projects page.

For more information come hang out in #openstack-swift on freenode.


The Swift Development Team