Now that we have created a block device on a Ceph cluster, in order to use this block device, we need to map it to the client machine. To do this, execute the following commands from the client-node1 machine.
- Map the block device to the
client-node1:# rbd map --image rbd1 --name client.rbd - Check the mapped block device:
# rbd showmapped --name client.rbd
- To make use of this block device, we should create a filesystem on this and mount it:
# fdisk -l /dev/rbd1 # mkfs.xfs /dev/rbd1 # mkdir /mnt/ceph-disk1 # mount /dev/rbd1 /mnt/ceph-disk1 # df -h /mnt/ceph-disk1
- Test the block device by writing data to it:
# dd if=/dev/zero of=/mnt/ceph-disk1/file1 count=100 bs=1M
- To map the block device across reboots, you should add
init-rbdmapscript to the system startup, add the Ceph user and keyring details to/etc/ceph/rbdmap, and finally, update the/etc/fstabfile:# wget https://raw.githubusercontent.com/ksingh7/ceph-cookbook/master/rbdmap -O /etc/init.d/rbdmap # chmod +x /etc/init.d/rbdmap # update-rc.d rbdmap defaults ## Make sure you use correct keyring value in /etc/ceph/rbdmap file, which is generally unique for an environment. # echo "rbd/rbd1 id=rbd,keyring=AQCLEg5VeAbGARAAE4ULXC7M5Fwd3BGFDiHRTw==" >> /etc/ceph/rbdmap # echo "/dev/rbd1 /mnt/ceph-disk1 xfs defaults, _netdev0 0 " >> /etc/fstab # mkdir /mnt/ceph-disk1 # /etc/init.d/rbdmap start
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