reproduced via vstart.sh , but `ceph osd metadata` shows that there are hostname info.
./bin/ceph osd metadata
*** DEVELOPER MODE: setting PATH, PYTHONPATH and LD_LIBRARY_PATH ***
2017-08-10 19:54:26.821377 7f68c7544700 -1 WARNING: all dangerous and experimental features are enabled.
2017-08-10 19:54:26.841056 7f68c7544700 -1 WARNING: all dangerous and experimental features are enabled.
[
{
"id": 0,
"arch": "x86_64",
"back_addr": "127.0.0.1:6802/7260",
"backend_filestore_dev_node": "unknown",
"backend_filestore_partition_path": "unknown",
"ceph_version": "ceph version 12.1.2-591-g20a03bb (20a03bb8af4ca4ffc8f6c738ceb5ac2ebdfaa0ef) luminous (rc)",
"cpu": "Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz",
"default_device_class": "hdd",
"distro": "ubuntu",
"distro_description": "Ubuntu 16.04.1 LTS",
"distro_version": "16.04",
"filestore_backend": "generic",
"filestore_f_type": "0xef53",
"front_addr": "127.0.0.1:6801/7260",
"hb_back_addr": "127.0.0.1:6803/7260",
"hb_front_addr": "127.0.0.1:6804/7260",
"hostname": "liuchang-VirtualBox",
"journal_rotational": "1",
"kernel_description": "#110-Ubuntu SMP Tue Jul 18 12:55:35 UTC 2017",
"kernel_version": "4.4.0-87-generic",
"mem_swap_kb": "10482684",
"mem_total_kb": "8174972",
"os": "Linux",
"osd_data": "/home/liuchang/WorkSpace/ceph/build/dev/osd0",
"osd_journal": "/home/liuchang/WorkSpace/ceph/build/dev/osd0/journal",
"osd_objectstore": "filestore",
"rotational": "1"
},