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Developer Guide (Quick)

This guide will describe how to build and test Ceph for development.

Development

The 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.

$ ./run-make-check.sh

Running a development deployment

Ceph contains a script called vstart.sh (see also :doc:`/dev/dev_cluster_deployement`) 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 src
$ ./vstart.sh -d -n -x

You can also configure vstart.sh to use only one monitor and one metadata server by using the following:

$ MON=1 MDS=1 ./vstart.sh -d -n -x

The system creates three pools on startup: cephfs_data, cephfs_metadata, and rbd. Let's get some stats on the current pools:

$ ./ceph osd pool stats
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
pool rbd id 0
  nothing is going on

pool cephfs_data id 1
  nothing is going on

pool cephfs_metadata id 2
  nothing is going on

$ ./ceph osd pool stats cephfs_data
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
pool cephfs_data id 1
  nothing is going on

$ ./rados df
pool name       category                 KB      objects       clones     degraded      unfound     rd        rd KB           wr        wr KB
rbd             -                          0            0            0            0     0            0            0            0            0
cephfs_data     -                          0            0            0            0     0            0            0            0            0
cephfs_metadata -                          2           20            0           40     0            0            0           21            8
  total used        12771536           20
  total avail     3697045460
  total space     3709816996

Make a pool and run some benchmarks against it:

$ ./rados mkpool mypool
$ ./rados -p mypool bench 10 write -b 123

Place a file into the new pool:

$ ./rados -p mypool put objectone <somefile>
$ ./rados -p mypool put objecttwo <anotherfile>

List the objects in the pool:

$ ./rados -p mypool ls

Once you are done, type the following to stop the development ceph deployment:

$ ./stop.sh

Running a RadosGW development environment

Add the -r to vstart.sh to enable the RadosGW

$ cd src
$ ./vstart.sh -d -n -x -r

You can now use the swift python client to communicate with the RadosGW.

$ swift -A http://localhost:8000/auth -U tester:testing -K asdf list
$ swift -A http://localhost:8000/auth -U tester:testing -K asdf upload mycontainer ceph
$ swift -A http://localhost:8000/auth -U tester:testing -K asdf list

Run unit tests

The tests are located in src/tests. To run them type:

$ make check