CephFS¶

CephFS has recently gone GA and we can now move forward with offering this to people as a charm. Up until this point it was considered too experimental to store production data on.

Problem Description¶

A new CephFS charm will be created. This charm will leverage the Ceph base layer.

Proposed Change¶

A new CephFS charm will be created. This charm will leverage the Ceph base layer. The effort required should be small once the Ceph base layer is ready to go.

Alternatives¶

GlusterFS is an alternative to CephFS and will probably fit many users needs. However there are users who don’t want to deploy additional hardware to create another cluster so this can be convenient in those cases.

Implementation¶

Assignee(s)¶

Primary assignee:: cholcombe973

Gerrit Topic¶

Use Gerrit topic “cephfs” for all patches related to this spec.

git-review -t cephfs

Work Items¶

ceph-fs charm¶

Create the ceph-fs charm utilizing the base Ceph layer
Expose interesting config items such as: mds cache size, mds bal mode
Create actions to allow blacklisting of misbehaving clients, breaking of locks, creating new filesystems, add_data_pool, remove_data_pool, set quotas, etc.

cephfs-interface¶

Create an interface to allow other charms to mount the filesytem.

Repositories¶

A new git repository will be required to host the ceph-fs charm:

https://git.openstack.org/openstack/charm-ceph-fs

Documentation¶

A README.md will be created for the charm as part of the normal development workflow.

Security¶

No additional security concerns.

Testing¶

A mojo spec will be developed to exercise this charm along with amulet tests if needed:

Deploy ceph-mon

Deploy ceph-osd

Deploy cephfs

Relate the three

Verify that CephFS can be mounted and responds to reads/writes

Dependencies¶

This project depends on the Ceph Layering project being successful.

CephFS