OSD类路径问题

$ rbd create rbd/test --size 100M
2021-03-16 01:26:59.012 7fe41426f080 -1 librbd::PoolMetadata: list: failed listing metadata: (95) Operation not supported
2021-03-16 01:26:59.012 7fe41426f080 -1 librbd::Config: apply_pool_overrides: failed to read pool config overrides: (95) Operation not supported
2021-03-16 01:26:59.012 7fe400ff9640 -1 librbd::image::CreateRequest: 0x55d62341bb30 handle_add_image_to_directory: error adding image to directory: (95) Operation not supported
rbd: create error: (95) Operation not supported

添加后，你可以看到哪个OSD被联系。--debug-ms=1在被联系OSD的日志中，你会发现发生这种情况的原因，dlopen:

2021-03-16 01:26:59.013 7f6c6dff3640 10 _load_class rbd from /usr/local/lib64/rados-classes/libcls_rbd.so
2021-03-16 01:26:59.013 7f6c6dff3640  0 _load_class could not stat class /usr/local/lib64/rados-classes/libcls_rbd.so: (2) No such file or directory
2021-03-16 01:26:59.013 7f6c6dff3640 -1 osd.3 112 class rbd open got (2) No such file or directory
2021-03-16 01:26:59.013 7f6c6dff3640  1 -- [...] --> [...] -- osd_op_reply(5 rbd_directory [call rbd.dir_add_image] v0'0 uv0 ondisk = -95 ((95) Operation not supported)) v8 -- 0x7f6c6800fed0 con 0x7f6cb80100c0

这意味着OSD无法找到libcls_rbd.so。ceph.conf with osd_class_dir。$libdir/rados-classes，所以在开发时，你可能需要调整路径。

这些类库用于扩展RADOS，见Ceph 对象类 SDK.

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