f60d05686f
Summary of the new configuration option: The cluster operators add the container_sync middleware to their proxy pipeline and create a container-sync-realms.conf for their cluster and copy this out to all their proxy and container servers. This file specifies the available container sync "realms". A container sync realm is a group of clusters with a shared key that have agreed to provide container syncing to one another. The end user can then set the X-Container-Sync-To value on a container to //realm/cluster/account/container instead of the previously required URL. The allowed hosts list is not used with this configuration and instead every container sync request sent is signed using the realm key and user key. This offers better security as source hosts can be faked much more easily than faking per request signatures. Replaying signed requests, assuming it could easily be done, shouldn't be an issue as the X-Timestamp is part of the signature and so would just short-circuit as already current or as superceded. This also makes configuration easier for the end user, especially with difficult networking situations where a different host might need to be used for the container sync daemon since it's connecting from within a cluster. With this new configuration option, the end user just specifies the realm and cluster names and that is resolved to the proper endpoint configured by the operator. If the operator changes their configuration (key or endpoint), the end user does not need to change theirs. DocImpact Change-Id: Ie1704990b66d0434e4991e26ed1da8b08cb05a37
Swift
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 http://docs.openstack.org/.
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.
Docs
To build documentation install sphinx (pip install sphinx), run
python setup.py build_sphinx, and then browse to /doc/build/html/index.html.
These docs are auto-generated after every commit and available online at
http://docs.openstack.org/developer/swift/.
For Developers
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.
You can run unit tests with .unittests and functional tests with
.functests.
Code Organization
- bin/: Executable scripts that are the processes run by the deployer
- doc/: Documentation
- etc/: Sample config files
- swift/: Core code
- account/: account server
- common/: code shared by different modules
- middleware/: "standard", officially-supported middleware
- ring/: code implementing Swift's ring
- container/: container server
- obj/: object server
- proxy/: proxy server
- test/: Unit and functional 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/server.py. 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/server.py.
For Deployers
Deployer docs are also available at http://docs.openstack.org/developer/swift/. A good starting point is at http://docs.openstack.org/developer/swift/deployment_guide.html
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 http://github.com/openstack/python-swiftclient.
Complete API documentation at http://docs.openstack.org/api/openstack-object-storage/1.0/content/
For more information come hang out in #openstack-swift on freenode.
Thanks,
The Swift Development Team