Ceph - a scalable distributed storage system
Please see https://ceph.com/ for current info.
Contributing Code
Most of Ceph is dual licensed under the LGPL version 2.1 or 3.0. Some miscellaneous code is under a BSD-style license or is public domain. The documentation is licensed under Creative Commons Attribution Share Alike 3.0 (CC-BY-SA-3.0). 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
Clone the ceph/ceph repository from github by running the following command on a system that has git installed:
git clone git@github.com:ceph/ceph
Alternatively, if you are not a github user, you should run the following command on a system that has git installed:
git clone https://github.com/ceph/ceph.git
When the ceph/ceph repository has been cloned to your system, run the following command to check out the git submodules associated with the ceph/ceph repository:
git submodule update --init --recursive
Build Prerequisites
section last updated 27 Jul 2023
Make sure that curl is installed. The Debian and Ubuntu apt command is
provided here, but if you use a system with a different package manager, then
you must use whatever command is the proper counterpart of this one:
apt install curl
Install Debian or RPM package dependencies by running the following command:
./install-deps.sh
Install the python3-routes package:
apt install python3-routes
Building Ceph
These instructions are meant for developers who are compiling the code for
development and testing. To build binaries that are suitable for installation
we recommend that you build .deb or .rpm packages, or refer to ceph.spec.in
or debian/rules to see which configuration options are specified for
production builds.
Build instructions:
./do_cmake.sh
cd build
ninja
do_cmake.sh defaults to creating a debug build of Ceph that can be up to 5x
slower with some workloads. Pass -DCMAKE_BUILD_TYPE=RelWithDebInfo to
do_cmake.sh to create a non-debug release.
The number of jobs used by ninja is derived from the number of CPU cores of
the building host if unspecified. Use the -j option to limit the job number
if the build jobs are running out of memory. On average, each job takes around
2.5GiB memory.
This assumes that you make your build directory a subdirectory of the ceph.git
checkout. If you put it elsewhere, just point CEPH_GIT_DIR to the correct
path to the checkout. Additional CMake args can be specified by setting ARGS
before invoking do_cmake.sh. See cmake options
for more details. For example:
ARGS="-DCMAKE_C_COMPILER=gcc-7" ./do_cmake.sh
To build only certain targets use:
ninja [target name]
To install:
ninja install
CMake Options
If you run the cmake command by hand, there are many options you can
set with "-D". For example, the option to build the RADOS Gateway is
defaulted to ON. To build without the RADOS Gateway:
cmake -DWITH_RADOSGW=OFF [path to top-level ceph directory]
Another example below is building with debugging and alternate locations for a couple of external dependencies:
cmake -DLEVELDB_PREFIX="/opt/hyperleveldb" \
-DCMAKE_INSTALL_PREFIX=/opt/ceph -DCMAKE_C_FLAGS="-Og -g3 -gdwarf-4" \
..
Ceph has several bundled dependencies such as Boost, RocksDB and Arrow. By
default, cmake will build these bundled dependencies from source instead of
using libraries that are already installed on the system. You can opt-in to
using these system libraries, provided they meet the minimum version required
by Ceph, with cmake options like WITH_SYSTEM_BOOST:
cmake -DWITH_SYSTEM_BOOST=ON [...]
To view an exhaustive list of -D options, you can invoke cmake with:
cmake -LH
If you often pipe ninja to less and would like to maintain the
diagnostic colors for errors and warnings (and if your compiler
supports it), you can invoke cmake with:
cmake -DDIAGNOSTICS_COLOR=always ...
Then you'll get the diagnostic colors when you execute:
ninja | less -R
Other available values for 'DIAGNOSTICS_COLOR' are 'auto' (default) and 'never'.
Building a source tarball
To build a complete source tarball with everything needed to build from source and/or build a (deb or rpm) package, run
./make-dist
This will create a tarball like ceph-$version.tar.bz2 from git. (Ensure that any changes you want to include in your working directory are committed to git.)
Running a test cluster
To run a functional test cluster,
cd build
ninja vstart # builds just enough to run vstart
../src/vstart.sh --debug --new -x --localhost --bluestore
./bin/ceph -s
Almost all of the usual commands are available in the bin/ directory. For example,
./bin/rados -p rbd bench 30 write
./bin/rbd create foo --size 1000
To shut down the test cluster,
../src/stop.sh
To start or stop individual daemons, the sysvinit script can be used:
./bin/init-ceph restart osd.0
./bin/init-ceph stop
Running unit tests
To build and run all tests (in parallel using all processors), use ctest:
cd build
ninja
ctest -j$(nproc)
(Note: Many targets built from src/test are not run using ctest.
Targets starting with "unittest" are run in ninja check and thus can
be run with ctest. Targets starting with "ceph_test" can not, and should
be run by hand.)
When failures occur, look in build/Testing/Temporary for logs.
To build and run all tests and their dependencies without other unnecessary targets in Ceph:
cd build
ninja check -j$(nproc)
To run an individual test manually, run ctest with -R (regex matching):
ctest -R [regex matching test name(s)]
(Note: ctest does not build the test it's running or the dependencies needed
to run it)
To run an individual test manually and see all the tests output, run
ctest with the -V (verbose) flag:
ctest -V -R [regex matching test name(s)]
To run tests manually and run the jobs in parallel, run ctest with
the -j flag:
ctest -j [number of jobs]
There are many other flags you can give ctest for better control
over manual test execution. To view these options run:
man ctest
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
Reporting Issues
To report an issue and view existing issues, please visit https://tracker.ceph.com/projects/ceph.