Ceph Octopus : Use Block Device2020/08/31 |
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Configure a Client Host [dlp] to use Ceph Storage like follows.
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+--------------------+ |
| [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 | | | | |
+-----------------------+ +-----------------------+ +-----------------------+
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For exmaple, Create a block device and mount it on a Client Host.
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| [1] | Transfer SSH public key to Client Host and Configure it from Admin Node. |
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# 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 00:00root@node01:~# scp /etc/ceph/ceph.client.admin.keyring dlp:/etc/ceph/ ceph.client.admin.keyring 100% 151 71.5KB/s 00:00root@node01:~# ssh dlp "chown ceph. /etc/ceph/ceph.*" |
| [2] | Create a Block device and mount it on a Client Host. |
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# 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 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:~#
root@dlp:~# mount /dev/rbd0 /mnt 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. |
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# 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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