Ubuntu 20.04
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Ceph Octopus : Use Block Device2020/08/31

 
Configure a Client Host [dlp] to use Ceph Storage like follows.
                                         |
        +--------------------+           |
        |   [dlp.srv.world]  |10.0.0.30  |
        |     Ceph Client    +-----------+
        |                    |           |
        +--------------------+           |
            +----------------------------+----------------------------+
            |                            |                            |
            |10.0.0.51                   |10.0.0.52                   |10.0.0.53 
+-----------+-----------+    +-----------+-----------+    +-----------+-----------+
|   [node01.srv.world]  |    |   [node02.srv.world]  |    |   [node03.srv.world]  |
|     Object Storage    +----+     Object Storage    +----+     Object Storage    |
|     Monitor Daemon    |    |                       |    |                       |
|     Manager Daemon    |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

 
For exmaple, Create a block device and mount it on a Client Host.
[1] Transfer SSH public key to Client Host and Configure it from Admin Node.
# transfer public key

root@node01:~#
ssh-copy-id dlp

# install required packages

root@node01:~#
ssh dlp "apt -y install ceph-common"
# transfer required files to Client Host

root@node01:~#
scp /etc/ceph/ceph.conf dlp:/etc/ceph/

ceph.conf                                     100%  195    98.1KB/s   00:00
root@node01:~#
scp /etc/ceph/ceph.client.admin.keyring dlp:/etc/ceph/

ceph.client.admin.keyring                     100%  151    71.5KB/s   00:00
root@node01:~#
ssh dlp "chown ceph. /etc/ceph/ceph.*"

[2] Create a Block device and mount it on a Client Host.
# create default RBD pool [rbd]

root@dlp:~#
ceph osd pool create rbd 128

pool 'rbd' created
# enable Placement Groups auto scale mode

root@dlp:~#
ceph osd pool set rbd pg_autoscale_mode on

set pool 2 pg_autoscale_mode to on
# initialize the pool

root@dlp:~#
rbd pool init rbd

root@dlp:~#
ceph osd pool autoscale-status

POOL                     SIZE  TARGET SIZE  RATE  RAW CAPACITY   RATIO  TARGET RATIO  EFFECTIVE RATIO  BIAS  PG_NUM  NEW PG_NUM  AUTOSCALE
device_health_metrics      0                 3.0        239.9G  0.0000                                  1.0       1              on
rbd                        6                 3.0        239.9G  0.0000                                  1.0     128          32  on

# create a block device with 10G

root@dlp:~#
rbd create --size 10G --pool rbd rbd01
# confirm

root@dlp:~#
rbd ls -l

NAME   SIZE    PARENT  FMT  PROT  LOCK
rbd01  10 GiB            2

# map the block device

root@dlp:~#
rbd map rbd01

/dev/rbd0
# confirm

root@dlp:~#
rbd showmapped

id  pool  namespace  image  snap  device
0   rbd              rbd01  -     /dev/rbd0

# format with XFS

root@dlp:~#
mkfs.xfs /dev/rbd0

meta-data=/dev/rbd0              isize=512    agcount=16, agsize=163840 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=16     swidth=16 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=16 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

root@dlp:~#
mount /dev/rbd0 /mnt

root@dlp:~#
df -hT

Filesystem                        Type      Size  Used Avail Use% Mounted on
udev                              devtmpfs  1.9G     0  1.9G   0% /dev
tmpfs                             tmpfs     394M  1.1M  393M   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv ext4       25G  3.1G   21G  14% /
tmpfs                             tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                             tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs                             tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/loop0                        squashfs   55M   55M     0 100% /snap/core18/1880
/dev/vda2                         ext4      976M  197M  713M  22% /boot
/dev/loop3                        squashfs   72M   72M     0 100% /snap/lxd/16100
/dev/loop4                        squashfs   30M   30M     0 100% /snap/snapd/8542
/dev/loop6                        squashfs   30M   30M     0 100% /snap/snapd/8790
/dev/loop7                        squashfs   56M   56M     0 100% /snap/core18/1885
tmpfs                             tmpfs     394M     0  394M   0% /run/user/0
/dev/loop2                        squashfs   71M   71M     0 100% /snap/lxd/16926
/dev/rbd0                         xfs        10G  105M  9.9G   2% /mnt
[3] For delete Block devices or Pools you created, run commands like follows.
For deleting Pools, it needs to set [mon allow pool delete = true] on [Monitor Daemon] configuration.
# unmap

root@dlp:~#
rbd unmap /dev/rbd/rbd/rbd01
# delete a block device

root@dlp:~#
rbd rm rbd01 -p rbd

Removing image: 100% complete...done.
# delete a pool

# ceph osd pool delete [Pool Name] [Pool Name] ***

root@dlp:~#
ceph osd pool delete rbd rbd --yes-i-really-really-mean-it

pool 'rbd' removed
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