1.说明

1.1介绍

MDS全称Ceph Metadata Server，是CephFS服务依赖的元数据服务。

2. 常用操作

2.1 查看mds的状态

$ ceph mds stat
test_fs-1/1/1 up test1_fs-1/1/1 up  {[test1_fs:0]=ceph-xx-osd03.gz01=up:active,[test_fs:0]=ceph-xx-osd00=up:active}

2.2 查看mds的映射信息

$ ceph mds dump
dumped fsmap epoch 50
fs_name test_fs
epoch   50
flags   4
created 2017-09-05 10:06:56.343105
modified    2017-09-05 10:06:56.343105
tableserver 0
root    0
session_timeout 60
session_autoclose   300
max_file_size   1099511627776
last_failure    0
last_failure_osd_epoch  4787
compat  compat={},rocompat={},incompat={1=base v0.20,2=client writeable ranges,3=default file layouts on dirs,4=dir inode in separate object,5=mds uses versioned encoding,6=dirfrag is stored in omap,8=file layout v2}
max_mds 1
in  0
up  {0=104262}
failed
damaged
stopped
data_pools  [2]
metadata_pool   3
inline_data disabled
balancer
standby_count_wanted    1
104262: 100.0.0.34:6800/1897776151 'ceph-xx-osd00' mds.0.37 up:active seq 151200

2.3 删除mds节点

$ ceph mds rm 0 mds.ceph-xx-osd00

2.4 增加数据存储池

$ ceph mds add_data_pool <pool>

2.5 关闭mds集群

$ ceph mds cluster_down
marked fsmap DOWN

2.6 启动mds集群

$ ceph mds cluster_up
unmarked fsmap DOWN

2.7 可删除兼容功能

$ ceph mds compat rm_compat <int[0-]>

2.8 可删除不兼容的功能

$ ceph mds compat rm_incompat <int[0-]>

2.9 查看兼容性选项

$ ceph mds compat show

2.10 删除数据存储池

$ ceph mds remove_data_pool <pool>

2.11 停止指定mds

$ ceph mds stop <node1>

2.12 向某个mds发送命令

$ ceph mds tell <node> <args> [<args>...]

2.13 添加mds机器

#添加一个机器 new_host 到现有mds集群中 
su - ceph  -c "ceph-deploy --ceph-conf /etc/ceph/ceph.conf  mds create $new_host"

2.14 查看客户端session

ceph daemon mds.ceph-xx-mds01.gz01 session ls