Ceph - a scalable distributed storage system
See https://ceph.com/ for current information about Ceph.
Contributing Code
Most of Ceph is dual-licensed under the LGPL version 2.1 or 3.0. Some miscellaneous code is either public domain or licensed under a BSD-style license.
The Ceph documentation is licensed under Creative Commons Attribution Share Alike 3.0 (CC-BY-SA-3.0).
Some headers included in the ceph/ceph repository are licensed under the GPL.
See the file COPYING for a full inventory of licenses by file.
All code contributions must include a valid "Signed-off-by" line. See the file
SubmittingPatches.rst for details on this and instructions on how to generate
and submit patches.
Assignment of copyright is not required 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 commands to move into the cloned ceph/ceph repository and to check
out the git submodules associated with it:
cd ceph
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.
To build Ceph, make sure that you are in the top-level ceph directory that
contains do_cmake.sh and CONTRIBUTING.rst and run the following commands:
./do_cmake.sh
cd build
ninja
do_cmake.sh by default creates a "debug build" of Ceph, which can be up to
five times slower than a non-debug build. Pass
-DCMAKE_BUILD_TYPE=RelWithDebInfo to do_cmake.sh to create a non-debug
build.
Ninja is the buildsystem used by the Ceph project
to build test builds. 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. If you
attempt to run ninja and receive a message that reads g++: fatal error: Killed signal terminated program cc1plus, then you have run out of memory.
Using the -j option with an argument appropriate to the hardware on which the
ninja command is run is expected to result in a successful build. For example,
to limit the job number to 3, run the command ninja -j 3. On average, each
ninja job run in parallel needs approximately 2.5 GiB of RAM.
This documentation assumes that your build directory is a subdirectory of the
ceph.git checkout. If the build directory is located elsewhere, point
CEPH_GIT_DIR to the correct path of 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, run a command of the following form:
ninja [target name]
To install:
ninja install
CMake Options
The -D flag can be used with cmake to speed up the process of building Ceph
and to customize the build.
Building without RADOS Gateway
The RADOS Gateway is built by default. To build Ceph without the RADOS Gateway, run a command of the following form:
cmake -DWITH_RADOSGW=OFF [path to top-level ceph directory]
Building with debugging and arbitrary dependency locations
Run a command of the following form to build Ceph with debugging and alternate locations for some external dependencies:
cmake -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 builds these bundled dependencies from source instead of using
libraries that are already installed on the system. You can opt to use these
system libraries, as long as they meet Ceph's version requirements. To use
system libraries, use cmake options like WITH_SYSTEM_BOOST, as in the
following example:
cmake -DWITH_SYSTEM_BOOST=ON [...]
To view an exhaustive list of -D options, invoke cmake -LH:
cmake -LH
Preserving diagnostic colors
If you pipe ninja to less and would like to preserve the diagnostic colors
in the output in order to make errors and warnings more legible, run the
following command:
cmake -DDIAGNOSTICS_COLOR=always ...
The above command works only with supported compilers.
The diagnostic colors will be visible when the following command is run:
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-$version.tar.bz2 from git. (Ensure that any changes you want to include in your working directory are committed to git.)
Running a test cluster
From the ceph/ directory, run the following commands to launch a test Ceph
cluster:
cd build
ninja vstart # builds just enough to run vstart
../src/vstart.sh --debug --new -x --localhost --bluestore
./bin/ceph -s
Most Ceph commands are available in the bin/ directory. For example:
./bin/rbd create foo --size 1000
./bin/rados -p foo bench 30 write
To shut down the test cluster, run the following command from the build/
directory:
../src/stop.sh
Use the sysvinit script to start or stop individual daemons:
./bin/init-ceph restart osd.0
./bin/init-ceph stop
Running unit tests
To build and run all tests (in parallel using all processors), use ctest:
cd build
ninja
ctest -j$(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.