ceph/README.md

============================================ Ceph - a scalable distributed storage system

Please see http://ceph.com/ for current info.

Contributing Code

Most of Ceph is licensed under the LGPL version 2.1. Some miscellaneous code is under BSD-style license or is public domain. The documentation is licensed under Creative Commons Attribution-ShareAlike (CC BY-SA). There are a handful of headers included here that are licensed under the GPL. Please see the file COPYING for a full inventory of licenses by file.

Code contributions must include a valid "Signed-off-by" acknowledging the license for the modified or contributed file. Please see the file SubmittingPatches.rst for details on what that means and on how to generate and submit patches.

We do not require assignment of copyright to contribute code; code is contributed under the terms of the applicable license.

Checking out the source

You can clone from github with

    git clone git@github.com:ceph/ceph

or, if you are not a github user,

    git clone git://github.com/ceph/ceph

Ceph contains many git submodules that need to be checked out with

    git submodule update --init --recursive

Build Prerequisites

The list of Debian or RPM packages dependencies can be installed with:

./install-deps.sh

Building Ceph

Autotools

Developers, please refer to the Developer Guide for more information, otherwise, you can build the server daemons, and FUSE client, by executing the following:

./autogen.sh
./configure
make

(Note that the FUSE client will only be built if libfuse is present.)

CMake

Prerequisite: CMake 2.8.11

Build instructions:

mkdir build
cd build
cmake [options] ..
make

This assumes you make your build dir a subdirectory of the ceph.git checkout. If you put it elsewhere, just replace .. above with a correct path to the checkout.

Dependencies

The configure script will complain about any missing dependencies as it goes. You can also refer to debian/control or ceph.spec.in for the package build dependencies on those platforms. In many cases, dependencies can be avoided with --with-foo or --without-bar switches. For example,

./configure --with-nss         # use libnss instead of libcrypto++
./configure --without-radosgw  # do not build radosgw
./configure --without-tcmalloc # avoid google-perftools dependency

Building packages

You can build packages for Debian or Debian-derived (e.g., Ubuntu) systems with

sudo apt-get install dpkg-dev
dpkg-checkbuilddeps        # make sure we have all dependencies
dpkg-buildpackage

For RPM-based systems (Red Hat, SUSE, etc.),

rpmbuild

Running a test cluster

Autotools

To run a functional test cluster,

cd src
./vstart.sh -d -n -x -l
./ceph -s

Almost all of the usual commands are available in the src/ directory. For example,

./rados -p rbd bench 30 write
./rbd create foo --size 1000

To shut down the test cluster,

./stop.sh

To start or stop individual daemons, the sysvinit script should work:

./init-ceph restart osd.0
./init-ceph stop

CMake

???

Running unit tests

Autotools

To run all tests, a simple

cd src
make check

will suffice. Each test generates a log file that is the name of the test with .log appended. For example, unittest_addrs generates a unittest_addrs.log and test/osd/osd-config.sh puts its output in test/osd/osd-config.sh.log.

To run an individual test manually, you may want to clean up with

rm -rf testdir /tmp/*virtualenv
./stop.sh

and then run a given test like so:

./unittest_addrs

Many tests are bash scripts that spin up small test clusters, and must be run like so:

CEPH_DIR=. test/osd/osd-bench.sh   # or whatever the test is

CMake

???

Building the Documentation

Prerequisites

The list of package dependencies for building the documentation can be found in doc_deps.deb.txt:

sudo apt-get install `cat doc_deps.deb.txt`

Building the Documentation

To build the documentation, ensure that you are in the top-level `/ceph directory, and execute the build script. For example:

admin/build-doc