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mount-on-linux-machine.md

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在 Linux 机器挂载 Ceph RBD

目的：在 Linux 机器挂载 Ceph RBD (RADOS block device)

创建 RBD

  1. 只保留 layering feature, 默认的 pool 是 rbd

    $ docker exec ceph_mon rbd create liuqsrbd0 --size 1024 --image-feature layering

  2. RBD 信息

    $ docker exec ceph_mon rbd --image liuqsrbd0 info
  rbd image 'liuqsrbd0':
     size 1024 MB in 256 objects
     order 22 (4096 kB objects)
     block_name_prefix: rbd_data.12d16b8b4567
     format: 2
     features: layering
     flags:

  3. 查看 Ceph admin 秘钥信息，供挂载使用

    $ cat /etc/ceph/ceph.client.admin.keyring
[client.admin]
     key = AQCeqZFXl96IFhAAWfONQRkve0PALi4meb5ICw==
     auid = 0
     caps mds = "allow"
     caps mon = "allow *"
     caps osd = "allow *"

挂载

  1. 确认kernel 加载 rbd 模块

    $ modprobe rbd

  2. Ceph MON 的IP, admin 秘钥，默认的 pool 是 rbd，RBD 是 liuqsrbd0

    #  echo "10.10.10.201,10.10.10.202,10.10.10.203  name=admin,secret=AQCeqZFXl96IFhAAWfONQRkve0PALi4meb5ICw== rbd liuqsrbd0" > /sys/bus/rbd/add

  3. 查看 RBD， 首个编号 rbd0

    # ll /dev/rbd*
brw-rw---- 1 root disk 252, 0 Jul 31 17:53 /dev/rbd0

  4. xfs 格式化，-L 是添加label

    # mkfs.xfs -L liuqsrbd0 /dev/rbd0
meta-data=/dev/rbd0              isize=256    agcount=9, agsize=31744 blks
       =                       sectsz=512   attr=2, projid32bit=1
       =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=262144, imaxpct=25
       =                       sunit=1024   swidth=1024 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal log           bsize=4096   blocks=2560, version=2
       =                       sectsz=512   sunit=8 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

  5. 创建目录，挂载

    # mkdir /mnt/rbd0
# mount /dev/rbd0 /mnt/rbd0
# df -h
Filesystem          Size  Used Avail Use% Mounted on
/dev/sda5           101G  9.4G   91G  10% /
devtmpfs             24G     0   24G   0% /dev
tmpfs                24G     0   24G   0% /dev/shm
tmpfs                24G   18M   24G   1% /run
tmpfs                24G     0   24G   0% /sys/fs/cgroup
/dev/sda1           197M  103M   95M  53% /boot
tmpfs               4.7G     0  4.7G   0% /run/user/1000
/dev/rbd0          1014M   33M  982M   4% /mnt/rbd0

卸载

  1. umount 目录，并 remove RBD， “0” 代表 RBD 的序号

    # umount /mnt/rbd0
# echo "0" >/sys/bus/rbd/remove

自动挂载

参考

  1. http://www.virtualtothecore.com/en/adventures-with-ceph-storage-part-6-mount-ceph-as-a-block-device-on-linux-machines/