[root@ceph-1 my_cluster]# ceph-deploy --overwrite-conf osd create ceph-1 --data data_vg1/data_lv1 --block-db block_db_vg1/block_db_lv1
[ceph_deploy.conf][DEBUG ] found configuration file at: /root/.cephdeploy.conf
[ceph_deploy.cli][INFO ] Invoked (2.0.1): /usr/bin/ceph-deploy --overwrite-conf osd create ceph-1 --data data_vg1/data_lv1 --block-db block_db_vg1/block_db_lv1
[ceph_deploy.cli][INFO ] ceph-deploy options:
[ceph_deploy.cli][INFO ] verbose : False
[ceph_deploy.cli][INFO ] bluestore : None
[ceph_deploy.cli][INFO ] cd_conf : <ceph_deploy.conf.cephdeploy.Conf instance at 0x132d170>
[ceph_deploy.cli][INFO ] cluster : ceph
[ceph_deploy.cli][INFO ] fs_type : xfs
[ceph_deploy.cli][INFO ] block_wal : None
[ceph_deploy.cli][INFO ] default_release : False
[ceph_deploy.cli][INFO ] username : None
[ceph_deploy.cli][INFO ] journal : None
[ceph_deploy.cli][INFO ] subcommand : create
[ceph_deploy.cli][INFO ] host : ceph-1
[ceph_deploy.cli][INFO ] filestore : None
[ceph_deploy.cli][INFO ] func : <function osd at 0x12b7a28>
[ceph_deploy.cli][INFO ] ceph_conf : None
[ceph_deploy.cli][INFO ] zap_disk : False
[ceph_deploy.cli][INFO ] data : data_vg1/data_lv1
[ceph_deploy.cli][INFO ] block_db : block_db_vg1/block_db_lv1
[ceph_deploy.cli][INFO ] dmcrypt : False
[ceph_deploy.cli][INFO ] overwrite_conf : True
[ceph_deploy.cli][INFO ] dmcrypt_key_dir : /etc/ceph/dmcrypt-keys
[ceph_deploy.cli][INFO ] quiet : False
[ceph_deploy.cli][INFO ] debug : False
[ceph_deploy.osd][DEBUG ] Creating OSD on cluster ceph with data device data_vg1/data_lv1
[ceph-1][DEBUG ] connected to host: ceph-1
[ceph-1][DEBUG ] detect platform information from remote host
[ceph-1][DEBUG ] detect machine type
[ceph-1][DEBUG ] find the location of an executable
[ceph_deploy.osd][INFO ] Distro info: CentOS Linux 7.1.1503 Core
[ceph_deploy.osd][DEBUG ] Deploying osd to ceph-1
[ceph-1][DEBUG ] write cluster configuration to /etc/ceph/{cluster}.conf
[ceph-1][DEBUG ] find the location of an executable
[ceph-1][INFO ] Running command: /usr/sbin/ceph-volume --cluster ceph lvm create --bluestore --data data_vg1/data_lv1 --block.db block_db_vg1/block_db_lv1
[ceph-1][DEBUG ] Running command: /bin/ceph-authtool --gen-print-key
[ceph-1][DEBUG ] Running command: /bin/ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring -i - osd new e9d0e462-08f9-4cb4-99de-ae360feeb5d8
[ceph-1][DEBUG ] Running command: /bin/ceph-authtool --gen-print-key
[ceph-1][DEBUG ] Running command: mount -t tmpfs tmpfs /var/lib/ceph/osd/ceph-0
[ceph-1][DEBUG ] Running command: restorecon /var/lib/ceph/osd/ceph-0
[ceph-1][DEBUG ] Running command: chown -h ceph:ceph /dev/data_vg1/data_lv1
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /dev/dm-2
[ceph-1][DEBUG ] Running command: ln -s /dev/data_vg1/data_lv1 /var/lib/ceph/osd/ceph-0/block
[ceph-1][DEBUG ] Running command: ceph --cluster ceph --name client.bootstrap-osd --keyring /var/lib/ceph/bootstrap-osd/ceph.keyring mon getmap -o /var/lib/ceph/osd/ceph-0/activate.monmap
[ceph-1][DEBUG ] stderr: got monmap epoch 1
[ceph-1][DEBUG ] Running command: ceph-authtool /var/lib/ceph/osd/ceph-0/keyring --create-keyring --name osd.0 --add-key AQDo2p5cB9vsIxAAIOyJUSvxxvhWxpmoMkqg/g==
[ceph-1][DEBUG ] stdout: creating /var/lib/ceph/osd/ceph-0/keyring
[ceph-1][DEBUG ] added entity osd.0 auth auth(auid = 18446744073709551615 key=AQDo2p5cB9vsIxAAIOyJUSvxxvhWxpmoMkqg/g== with 0 caps)
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /var/lib/ceph/osd/ceph-0/keyring
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /var/lib/ceph/osd/ceph-0/
[ceph-1][DEBUG ] Running command: chown -h ceph:ceph /dev/block_db_vg1/block_db_lv1
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /dev/dm-3
[ceph-1][DEBUG ] Running command: /bin/ceph-osd --cluster ceph --osd-objectstore bluestore --mkfs -i 0 --monmap /var/lib/ceph/osd/ceph-0/activate.monmap --keyfile - --bluestore-block-db-path /dev/block_db_vg1/block_db_lv1 --osd-data /var/lib/ceph/osd/ceph-0/ --osd-uuid e9d0e462-08f9-4cb4-99de-ae360feeb5d8 --setuser ceph --setgroup ceph
[ceph-1][DEBUG ] --> ceph-volume lvm prepare successful for: data_vg1/data_lv1
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /var/lib/ceph/osd/ceph-0
[ceph-1][DEBUG ] Running command: ceph-bluestore-tool --cluster=ceph prime-osd-dir --dev /dev/data_vg1/data_lv1 --path /var/lib/ceph/osd/ceph-0
[ceph-1][DEBUG ] Running command: ln -snf /dev/data_vg1/data_lv1 /var/lib/ceph/osd/ceph-0/block
[ceph-1][DEBUG ] Running command: chown -h ceph:ceph /var/lib/ceph/osd/ceph-0/block
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /dev/dm-2
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /var/lib/ceph/osd/ceph-0
[ceph-1][DEBUG ] Running command: ln -snf /dev/block_db_vg1/block_db_lv1 /var/lib/ceph/osd/ceph-0/block.db
[ceph-1][DEBUG ] Running command: chown -h ceph:ceph /dev/block_db_vg1/block_db_lv1
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /dev/dm-3
[ceph-1][DEBUG ] Running command: chown -h ceph:ceph /var/lib/ceph/osd/ceph-0/block.db
[ceph-1][DEBUG ] Running command: chown -R ceph:ceph /dev/dm-3
[ceph-1][DEBUG ] Running command: systemctl enable ceph-volume@lvm-0-e9d0e462-08f9-4cb4-99de-ae360feeb5d8
[ceph-1][DEBUG ] stderr: Created symlink from /etc/systemd/system/multi-user.target.wants/ceph-volume@lvm-0-e9d0e462-08f9-4cb4-99de-ae360feeb5d8.service to /usr/lib/systemd/system/ceph-volume@.service.
[ceph-1][DEBUG ] Running command: systemctl enable --runtime ceph-osd@0
[ceph-1][DEBUG ] Running command: systemctl start ceph-osd@0
[ceph-1][DEBUG ] --> ceph-volume lvm activate successful for osd ID: 0
[ceph-1][DEBUG ] --> ceph-volume lvm create successful for: data_vg1/data_lv1
[ceph-1][INFO ] checking OSD status...
[ceph-1][DEBUG ] find the location of an executable
[ceph-1][INFO ] Running command: /bin/ceph --cluster=ceph osd stat --format=json
[ceph_deploy.osd][DEBUG ] Host ceph-1 is now ready for osd use.
ceph删除一个osd
删除osd
正常处理流程：
停止osd进程——将节点状态标记为out——从crush中移除节点——删除节点——删除节点认证
根据这个方法会触发两次迁移，一次是在节点osd out以后，一次是在crush remove以后。参考磨渣-删除OSD的正确方式,调整处理步骤能够减少一次数据迁移。
在ceph的集群当中关于节点的替换的问题，一直按照以前的方式进行的处理，处理的步骤如下：
调整OSD的CRUSH WEIGHT
ceph osd crush reweight osd.0 0.1
说明：这个地方如果想慢慢的调整就分几次将crush 的weight 减低到0 ，这个过程实际上是让数据不分布在这个节点上，让数据慢慢的分布到其他节点上，直到最终为没有分布在这个osd，并且迁移完成
这个地方不光调整了osd 的crush weight ，实际上同时调整了host 的 weight ，这样会调整集群的整体的crush 分布，在osd 的crush 为0 后， 再对这个osd的任何删除相关操作都不会影响到集群的数据的分布
停止OSD进程
systemctl stop ceph-osd@0
停止到osd的进程，这个是通知集群这个osd进程不在了，不提供服务了，因为本身没权重，就不会影响到整体的分布，也就没有迁移
将节点状态标记为out
ceph osd out osd.0
停止到osd的进程，这个是通知集群这个osd不再映射数据了，不提供服务了，因为本身没权重，就不会影响到整体的分布，也就没有迁移
从CRUSH中移除节点
ceph osd crush remove osd.0
这个是从crush中删除，因为已经是0了 所以没影响主机的权重，也就没有迁移了
删除节点
ceph osd rm osd.0
这个是从集群里面删除这个节点的记录
删除节点认证（不删除编号会占住）
ceph auth del osd.0
删除HOST节点
将OSD全部删除后，如果还需要在集群中删除该osd的host节点，可以使用该命令。
ceph osd crush rm test5
