Ubuntu 18.04
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Ceph : Use as Block Device
2018/12/25
 
Configure Clients to use Ceph Storage like follows.
                                         |
        +--------------------+           |           +--------------------+
        |   [dlp.srv.world]  |10.0.0.30  |   10.0.0.x| [client.srv.world] |
        |    Ceph-Deploy     +-----------+-----------+                    |
        |                    |           |           |                    |
        +--------------------+           |           +--------------------+
            +----------------------------+----------------------------+
            |                            |                            |
            |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    |    |                       |    |                       |
|                       |    |                       |    |                       |
+-----------------------+    +-----------------------+    +-----------------------+

 
For exmaple, Create a block device and mount it on a Client.
[1] First, Configure Sudo and SSH key-pair for a user on a Client and next, Install Ceph from Ceph admin Node like follows.
ubuntu@dlp:~/ceph$
ceph-deploy install client

ubuntu@dlp:~/ceph$
ceph-deploy admin client
ubuntu@dlp:~/ceph$
sudo ceph osd pool create rbd 8

pool 'rbd' created
ubuntu@dlp:~/ceph$
sudo rbd pool init rbd

[2] Create a Block device and mount it on a Client.
# create a disk with 10G

ubuntu@client:~$
sudo rbd create rbd01 --size 10G --image-feature layering
# show list

ubuntu@client:~$
sudo rbd ls -l

NAME    SIZE PARENT FMT PROT LOCK
rbd01 10240M          2

# map the image to device

ubuntu@client:~$
sudo rbd map rbd01

/dev/rbd0
# show mapping

ubuntu@client:~$
rbd showmapped

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

# format with XFS

ubuntu@client:~$
sudo mkfs.xfs /dev/rbd0
# mount device

ubuntu@client:~$
sudo mount /dev/rbd0 /mnt
ubuntu@client:~$
df -hT

Filesystem                  Type      Size  Used Avail Use% Mounted on
udev                        devtmpfs  1.9G     0  1.9G   0% /dev
tmpfs                       tmpfs     395M  624K  394M   1% /run
/dev/mapper/ubuntu--vg-root ext4       29G  2.3G   25G   9% /
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
tmpfs                       tmpfs     395M     0  395M   0% /run/user/0
/dev/rbd0                   xfs        10G   44M   10G   1% /mnt
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