This document is for a development version of Ceph.
Developer Guide (Quick)¶
This guide will describe how to build and test Ceph for development.
run-make-check.sh script will install Ceph dependencies,
compile everything in debug mode and run a number of tests to verify
the result behaves as expected.
Optionally if you want to work on a specific component of Ceph, install the dependencies and build Ceph in debug mode with required cmake flags.
./install-deps.sh ./do_cmake.sh -DWITH_MANPAGE=OFF -DWITH_BABELTRACE=OFF -DWITH_MGR_DASHBOARD_FRONTEND=OFF
You can also turn off building of some core components that are not relevant to your development:
./do_cmake.sh ... -DWITH_RBD=OFF -DWITH_KRBD=OFF -DWITH_RADOSGW=OFF
Finally, build ceph:
cmake --build build [--target <target>...]
--target... if you want to do a full build.
Running a development deployment¶
Ceph contains a script called
vstart.sh (see also
Deploying a development cluster) which allows developers to quickly test
their code using a simple deployment on your development system. Once the build
finishes successfully, start the ceph deployment using the following command:
cd build ../src/vstart.sh -d -n
You can also configure
vstart.sh to use only one monitor and one metadata server by using the following:
env MON=1 MDS=1 ../src/vstart.sh -d -n -x
Most logs from the cluster can be found in
The system creates two pools on startup: cephfs_data_a and cephfs_metadata_a. Let’s get some stats on the current pools:
$ bin/ceph osd pool stats *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH *** pool cephfs_data_a id 1 nothing is going on pool cephfs_metadata_a id 2 nothing is going on $ bin/ceph osd pool stats cephfs_data_a *** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH *** pool cephfs_data_a id 1 nothing is going on $ bin/rados df POOL_NAME USED OBJECTS CLONES COPIES MISSING_ON_PRIMARY UNFOUND DEGRADED RD_OPS RD WR_OPS WR cephfs_data_a 0 0 0 0 0 0 0 0 0 0 0 cephfs_metadata_a 2246 21 0 63 0 0 0 0 0 42 8192 total_objects 21 total_used 244G total_space 1180G
Make a pool and run some benchmarks against it:
bin/ceph osd pool create mypool bin/rados -p mypool bench 10 write -b 123
Place a file into the new pool:
bin/rados -p mypool put objectone <somefile> bin/rados -p mypool put objecttwo <anotherfile>
List the objects in the pool:
bin/rados -p mypool ls
Once you are done, type the following to stop the development ceph deployment:
Resetting your vstart environment¶
The vstart script creates out/ and dev/ directories which contain the cluster’s state. If you want to quickly reset your environment, you might do something like this:
../src/stop.sh rm -rf out dev env MDS=1 MON=1 OSD=3 ../src/vstart.sh -n -d
Running a RadosGW development environment¶
RGW environment variable when running vstart.sh to enable the RadosGW.
cd build RGW=1 ../src/vstart.sh -d -n -x
You can now use the swift python client to communicate with the RadosGW.
swift -A http://localhost:8000/auth -U test:tester -K testing list swift -A http://localhost:8000/auth -U test:tester -K testing upload mycontainer ceph swift -A http://localhost:8000/auth -U test:tester -K testing list
Run unit tests¶
The tests are located in src/tests. To run them type:
(cd build && ninja check)