Python librbd

安装librbd

Ceph官方提供Python库来访问RBD，通过以下命令可以安装。

  1. apt-get install -y python-ceph

创建Image

使用librbd创建Image也很简单，下面是示例代码。

  1. import rados
  2. import rbd
  4. cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
  5. cluster.connect()
  6. ioctx = cluster.open_ioctx('rbd')
  8. rbd_inst = rbd.RBD()
  9. size = 1024**3
  10. image_name = "test_image"
  11. rbd_inst.create(ioctx, image_name, size)
  13. image = rbd.Image(ioctx, image_name)
  14. data = 'foo' * 200
  15. image.write(data, 0)
  17. image.close()
  18. ioctx.close()
  19. cluster.shutdown()

也可以把下面代码保存成文件直接执行。

  1. cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
  2. try:
  3.     ioctx = cluster.open_ioctx('rbd')
  4.     try:
  5.         rbd_inst = rbd.RBD()
  6.         size = 1024**3
  7.     image_name = "test_image"
  8.         rbd_inst.create(ioctx, image_name, size)
  9.         image = rbd.Image(ioctx, image_name)
  10.         try:
  11.             data = 'foo' * 200
  12.             image.write(data, 0)
  13.         finally:
  14.             image.close()
  15.     finally:
  16.         ioctx.close()
  17. finally:
  18.     cluster.shutdown()

或者这样。

  1. with rados.Rados(conffile='/etc/ceph/ceph.conf') as cluster:
  2.     with cluster.open_ioctx('rbd') as ioctx:
  3.         rbd_inst = rbd.RBD()
  4.         size = 1024**3
  5.     image_name = "test_image"
  6.         rbd_inst.create(ioctx, image_name, size)
  7.         with rbd.Image(ioctx, image_name) as image:
  8.             data = 'foo' * 200
  9.             image.write(data, 0)