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liewegas Merge PR #34062 into master
* refs/pull/34062/head:
	cephadm: update check-host() to return all problems

Reviewed-by: Sebastian Wagner <swagner@suse.com>
Latest commit 9f3f05c Mar 28, 2020

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admin Merge pull request #33911 from tchaikov/wip-cephfs-doc Mar 24, 2020
alpine alphine: remove urcu Oct 5, 2019
bin scripts: fix bash path in shebangs (part 2) Sep 25, 2017
ceph-erasure-code-corpus @ 2d7d78b tests: erasure-code: add k=2, m=2 for isa & jerasure Dec 8, 2016
ceph-menv ceph-menv: mrun shell environment May 21, 2018
ceph-object-corpus @ e9bd1db ceph-object-corpus: forward_incompat pg_missing_item and pg_missing_t May 9, 2019
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README.md

Ceph - a scalable distributed storage system

Please see http://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 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

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

Note that these instructions are meant for developers who are compiling the code for development and testing. To build binaries suitable for installation we recommend you build deb or rpm packages, or refer to the ceph.spec.in or debian/rules to see which configuration options are specified for production builds.

Build instructions:

./do_cmake.sh
cd build
make

(Note: do_cmake.sh now defaults to creating a debug build of ceph that can be up to 5x slower with some workloads. Please pass "-DCMAKE_BUILD_TYPE=RelWithDebInfo" to do_cmake.sh to create a non-debug release.)

(Note: make alone will use only one CPU thread, this could take a while. use the -j option to use more threads. Something like make -j$(nproc) would be a good start.

This assumes you make your build dir a subdirectory of the ceph.git checkout. If you put it elsewhere, just point CEPH_GIT_DIRto the correct path to the checkout. Any additional CMake args can be specified setting ARGS before invoking do_cmake. See cmake options for more details. Eg.

ARGS="-DCMAKE_C_COMPILER=gcc-7" ./do_cmake.sh

To build only certain targets use:

make [target name]

To install:

make 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" -DOFED_PREFIX="/opt/ofed" \
-DCMAKE_INSTALL_PREFIX=/opt/accelio -DCMAKE_C_FLAGS="-O0 -g3 -gdwarf-4" \
..

To view an exhaustive list of -D options, you can invoke cmake with:

cmake -LH

If you often pipe make 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:

make | 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
make 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
make
ctest -j$(nproc)

(Note: Many targets built from src/test are not run using ctest. Targets starting with "unittest" are run in make 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
make 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 an 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
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