tahoe-lafs/README

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Welcome to the AllMyData "tahoe" project. This project implements a secure,
distributed, fault-tolerant storage grid.
The basic idea is that the data in this storage grid is spread over all
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participating nodes, using an algorithm that can recover the data even if a
majority of the nodes are no longer available.
The interface to the storage grid allows you to store and fetch files, either
by self-authenticating cryptographic identifier or by filename and path.
See the web site for all kinds of information, news, and community
contributions, including prebuilt packages for Debian-like systems:
http://allmydata.org
LICENCE:
Tahoe is offered under the GNU General Public License (v2 or later), with
the added permission that, if you become obligated to release a derived work
under this licence (as per section 2.b), you may delay the fulfillment of
this obligation for up to 12 months. See the COPYING file for details.
GETTING THE SOURCE CODE:
The code is available via darcs by running the following command:
darcs get http://allmydata.org/source/tahoe/trunk tahoe
Tarballs of sources are available at:
http://allmydata.org/source/tahoe/
DEPENDENCIES:
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Note: All of the following dependencies can probably be installed through
your standard package management tool if you are running on a modern Unix
operating system.
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For example, on an debian-like system, you can do "sudo apt-get install
gcc make python-dev python-twisted python-nevow python-pyopenssl".
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+ a C compiler (language)
+ GNU make (build tool)
+ Python 2.4 or newer (tested against 2.4, and 2.5.1, but v2.5 or higher
is required on Windows-native), including development headers (language)
http://python.org/
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+ Python Twisted (tested against both 2.4 and 2.5) (network and operating
system integration library)
http://twistedmatrix.com/
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You need the following subpackages, which are included in the default
Twisted distribution:
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* core (the standard Twisted package)
* web, trial, conch
Twisted requires zope.interface, a copy of which is included in the
Twisted distribution.
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+ Python Nevow (probably 0.9.0 or later) (web presentation language)
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http://divmod.org/trac/wiki/DivmodNevow
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+ Python setuptools (build and distribution tool)
Note: The build process will automatically download and install
setuptools if it is not present. However, if an old, incompatible
version of setuptools (< v0.6c3) is present, then the build will fail.
Therefore, if the build fails due to setuptools not being compatible,
you can either upgrade or uninstall your version of setuptools and try
again.
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http://peak.telecommunity.com/DevCenter/EasyInstall#installation-instructions
+ Python PyOpenSSL (0.6 or later) (secure transport layer)
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http://pyopenssl.sourceforge.net
To install PyOpenSSL on Windows-native, download this:
http://allmydata.org/source/pyOpenSSL-0.6.win32-py2.5.exe
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+ the pywin32 package: only required on Windows
http://sourceforge.net/projects/pywin32/
BUILDING:
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Just type 'make' in the top-level tahoe directory. This works on Windows
too, provided that you have the dependencies mentioned above (either a
normal cygwin build or a mingw-style native build will be done by the
makefile, depending on whether the version of python that you have installed
is the Windows-native python or the cygwin python.)
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If the desired version of 'python' is not already on your PATH, then type
'make PYTHON=/path/to/your/preferred/python'.
'make test-all' runs the unit test suites. (This can take a long time on
slow computers. There are a lot of tests and some of them do a lot of
public-key cryptography.)
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INSTALLING:
There are three ways to do it. Choose one:
The Debian Way:
The Debian Way is to build .deb files which you can then install with
"dpkg".
This requires the debian packages build-essential, fakeroot, devscripts,
and the packages listed as "Build-Depends" in the DIST/debian/control in
the top-level tahoe directory, replacing the word DIST with etch, dapper,
edgy, or feisty as appropriate:
If you're running on a debian system, run 'make deb-dapper', 'make
deb-sid', 'make deb-edgy', or 'make deb-feisty', from within the tahoe
top-level directory, to construct two debian packages named
'allmydata-tahoe' and 'python-foolscap' which you can then install with
dpkg.
The Python Way:
The Python Way is to execute "setup.py install" for each Python package.
You'll need to run "setup.py install" four separate times, one for each of
the four subpackages (allmydata, allmydata.Crypto, foolscap, and zfec). If
you use GNU stow, add the options "--prefix=." and
"--root=/usr/local/stow/${PACKAGE}" to the "setup.py install" command.
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for PACKAGE in zfec Crypto foolscap ; do
cd src/${PACKAGE} && python setup.py install && cd ../..
done
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# the tahoe subpackage's setup.py script is in the root directory
PACKAGE=tahoe
python setup.py install
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The Running-In-Place Way:
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The Running-In-Place Way is to add a directory to your PYTHONPATH.
To run from a source tree (without installing first), type 'make', which
will put all the necessary libraries into a local directory named
"./instdir/lib", which you can then add to your PYTHONPATH . (It will put
executables into "./instdir/bin".)
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TESTING THAT IT IS PROPERLY INSTALLED
To test that all the modules got installed properly, start a python
interpreter and import modules as follows. If each one imports successfully
instead of raising ImportError then it is correctly installed.
% python
Python 2.4.4 (#2, Jan 13 2007, 17:50:26)
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import zfec
>>> import allmydata.Crypto
>>> import foolscap
>>> import allmydata.interfaces
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RUNNING:
If you installed one of the debian packages constructed by "make deb-*",
then it creates an 'allmydata-tahoe' executable, usually in /usr/bin . If
you didn't install a package you can find allmydata-tahoe in ./instdir/bin/
. This tool is used to create, start, and stop nodes. Each node lives in a
separate base directory, inside of which you can add files to configure and
control the node. Nodes also read and write files within that directory.
A grid consists of a single central 'introducer and vdrive' node and a large
number of 'client' nodes. If you are joining an existing grid, the
introducer-and-vdrive node will already be running, and you'll just need to
create a client node. If you're creating a brand new grid, you'll need to
create both an introducer-and-vdrive and a client (and then invite other
people to create their own client nodes and join your grid).
The introducer (-and-vdrive) node is constructed by running 'allmydata-tahoe
create-introducer --basedir $HERE'. Once constructed, you can start the
introducer by running 'allmydata-tahoe start --basedir $HERE' (or, if you
are already in the introducer's base directory, just type 'allmydata-tahoe
start'). Inside that base directory, there will be a pair of files
'introducer.furl' and 'vdrive.furl'. Make a copy of these, as they'll be
needed on the client nodes.
To construct a client node, pick a new working directory for it, then run
'allmydata-tahoe create-client --basedir $HERE'. Copy the two .furl files
from the introducer into this new directory, then run 'allmydata-tahoe start
--basedir $HERE'. After that, the client node should be off and running.
The first thing it will do is connect to the introducer and introduce itself
to all other nodes on the grid. You can follow its progress by looking at
the $HERE/twistd.log file.
To actually use the client, enable the web interface by writing a port
number (like "8080") into a file named $HERE/webport and then restarting the
node with 'allmydata-tahoe restart --basedir $HERE'. This will prompt the
client node to run a webserver on the desired port, through which you can
view, upload, download, and delete files.
A client node directory can also be created without installing the code
first. Just use 'make create-client', and a new directory named 'CLIENTDIR'
will be created inside the top of the source tree. Copy the relevant .furl
files in, set the webport, then start the node by using 'make start-client'.
To stop it again, use 'make stop-client'. Similar makefile targets exist
for making and running an introducer node.
There is a public grid available for testing. Look at the wiki page
(http://allmydata.org) for the necessary .furl data.