環境：ceph-12.2.1 3節點測試性能集群 60塊osd
最近ceph集群中有兩個osd在重啟之后遇到如下問題,osd獲取不到集群osdmap產生coredump：

 ceph version 12.2.1.06 (3e7492b9ada8bdc9a5cd0feafd42fbca27f9c38e) luminous (stable)1: (()+0xa2bf21) [0x7fcd91627f21]2: (()+0xf6d0) [0x7fcd8e42d6d0]3: (gsignal()+0x37) [0x7fcd8d44e277]4: (abort()+0x148) [0x7fcd8d44f968]5: (__gnu_cxx::__verbose_terminate_handler()+0x165) [0x7fcd8dd5d9d5]6: (()+0x5e946) [0x7fcd8dd5b946]7: (()+0x5e973) [0x7fcd8dd5b973]8: (()+0x5eb9f) [0x7fcd8dd5bb9f]9: (entity_addr_t::decode(ceph::buffer::list::iterator&)+0x31d) [0x7fcd9111f1bd]10: (void decode<entity_addr_t, mempool::pool_allocator<(mempool::pool_index_t)15, std::shared_ptr<entity_addr_t> > >(std::vector<std::shared_ptr<entity_addr_t>, mempool::pool_allocator<(mempool::pool_index_t)15, std::shared_ptr<entity_addr_t> > >&, ceph::buffer::list::iterator&)+0xfc) [0x7fcd91743ddc]11: (OSDMap::decode_classic(ceph::buffer::list::iterator&)+0x66a) [0x7fcd9172daca]12: (OSDMap::decode(ceph::buffer::list::iterator&)+0x8c) [0x7fcd9173ae5c]13: (OSDMap::decode(ceph::buffer::list&)+0x2e) [0x7fcd9173c41e]14: (OSDService::try_get_map(unsigned int)+0x664) [0x7fcd910ea6a4]15: (OSD::load_pgs()+0x1209) [0x7fcd910ee909]16: (OSD::init()+0x2186) [0x7fcd91106606]17: (main()+0x2e05) [0x7fcd9100bd75]18: (__libc_start_main()+0xf5) [0x7fcd8d43a445]19: (()+0x4ae306) [0x7fcd910aa306]NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

解決辦法：將正常osd上的osdmap取出寫回故障osd中

• 設置故障osd的debug等級為20，查看出現coredump問題時osdmap的版本號,例如214
  ceph daemon osd.58 config set debug_osd 20
• 使用ceph-objectstore-tool工具從正常osd上獲取對應版本號的osdmap
  systemctl stop ceph-osd@id(正常) 該工具需要先停止osd
  ceph-objectstore-tool --op get-osdmap --epoch 314 --data-path /var/lib/ceph/osd/ceph-id --type bluestore --file osdmap314
• 將獲取到的osdmap寫回故障osd里
  ceph-objectstore-tool --op set-osdmap --epoch 314 --data-path /var/lib/ceph/osd/ceph-58 --type bluestore --file osdmap314
• 啟動故障osd即可
  systemctl start ceph-osd@58

總結

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