Ceph - a scalable distributed storage system

See https://ceph.com/ for current information about Ceph.

Status

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 [email protected]: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 --progress

Build Prerequisites

section last updated 06 Sep 2024

We provide the Debian and Ubuntu apt commands in this procedure. If you use a system with a different package manager, then you will have to use different commands.

#. Install curl:

apt install curl

#. Install package dependencies by running the install-deps.sh script:

./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, follow this procedure:

1. Make sure that you are in the top-level ceph directory that contains do_cmake.sh and CONTRIBUTING.rst.

2. Run the do_cmake.sh script:

   ./do_cmake.sh
   

   See build types.

3. Move into the build directory:

   cd build
   

4. Use the ninja buildsystem to build the development environment:

   ninja -j3
   

   [!IMPORTANT]

   Ninja is the build system 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 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 -j3. 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]
   

5. Install the vstart cluster:

   ninja install
   

Build Types

do_cmake.sh by default creates a "debug build" of Ceph (assuming .git exists). A Debug build runtime performance may be as little as 20% of that of a non-debug build. Pass -DCMAKE_BUILD_TYPE=RelWithDebInfo to do_cmake.sh to create a non-debug build. The default build type is RelWithDebInfo once .git does not exist.

CMake mode	Debug info	Optimizations	Sanitizers	Checks	Use for
Debug	Yes	-Og	None	ceph_assert, assert	gdb, development
RelWithDebInfo	Yes	-O2, -DNDEBUG	None	ceph_assert only	production

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" \
..

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