To configure the Meta Data Server for the Ceph Filesystem, you should have a running Ceph cluster. In earlier chapters, we learned to deploy the Ceph storage cluster; we will use the same cluster for MDS deployment.
- Use
ceph-deployfromceph-node1to deploy and configure MDS onceph-node2:# ceph-deploy --overwrite-conf mds create ceph-node2
- The command should deploy the MDS and start its daemon on
ceph-node2; however, we need to carry out a few more steps to get CephFS accessible:# ssh ceph-node2 service ceph status mds
- Create data and metadata pools for the Ceph Filesystem:
# ceph osd pool create cephfs_data 64 64 # ceph osd pool create cephfs_metadata 64 64
- Finally, create the Ceph Filesystem; once this command is executed the MDS should attain an active state and CephFS should be ready for use:
# ceph fs new cephfs cephfs_metadata cephfs_data
- To verify the status of CephFS and MDS, use the following commands:
# ceph mds stat # ceph fs ls
- It's recommended that you don't share
client.adminuser keyrings with Ceph clients, so we will create a userclient.cephfson the Ceph cluster and will allow this user access to CephFS pools:# ceph auth get-or-create client.cephfs mon 'allow r' osd 'allow rwx pool=cephfs_metadata,allow rwx pool=cephfs_data' -o /etc/ceph/client.cephfs.keyring # ceph-authtool -p -n client.cephfs /etc/ceph/client.cephfs.keyring > /etc/ceph/client.cephfs # cat /etc/ceph/client.cephfs
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