Preparing CEPH for main inclusion

Registered by Clint Byrum on 2011-10-11

CEPH has become a first class object and block storage mechanism, and has integration hooks for key pieces of Ubuntu Cloud Infrastructure. Especially interesting is CEPH-RBD for storing kvm block devices on the scalable CEPH block store, and the Hadoop HDFS shim to replace HDFS with CEPH in hadoop clusters.

Blueprint information

Status:
Complete
Approver:
Antonio Rosales
Priority:
Low
Drafter:
Ubuntu Server Team
Direction:
Approved
Assignee:
Clint Byrum
Definition:
Approved
Series goal:
Accepted for precise
Implementation:
Implemented
Milestone target:
milestone icon ubuntu-12.04-beta-1
Started by
Robbie Williamson on 2012-02-17
Completed by
Clint Byrum on 2012-04-16

Related branches

Sprints

Whiteboard

Work Items:
[canonical-kernel-team] investigate large xattr support patch from Ted T'so in ext4: POSTPONED
[canonical-kernel-team] potentially help push large xattr support to ext4: POSTPONED
confer with kernel-team to decide on which to recommend, ext4/xfs/btrfs (xfs or btrfs, ext4 will not work due to large xattr problems): DONE
define Ubuntu supported configurations of CEPH (only librbd/librados made it into main for precise): DONE
improve ceph charms: POSTPONED
integrate ceph charm with openstack charms: POSTPONED
libvirt changes needed: POSTPONED
MIR ceph ( http://pad.lv/932898 ): DONE
[serge-hallyn] enable rbd and rados in qemu-kvm builds: DONE
[nijaba] correctly message technology preview for non-supported bits: DONE
investigate apache + 100 continue support for rados S3 GW: POSTPONED
push nagios and collectd plugins into Ubuntu/Debian/Upstream: POSTPONED
setup automated build recipe against upstream source: POSTPONED
import upstream test suite into archive: POSTPONED
[sconklin] ext4/btrfs/xfs testing in QA: POSTPONED

Notes:
qemu-kvm librados builds are blocked on bug 932898 being fix released.

No formal spec needed IMO, this is just a pile of straight forward actions.

 * gceph is not reasonable to be in main (upstream doesnt want to support)

    Today rbd is loaded loaded at runtime

 - MIR librbd and librados for qemu/kvm
  - compile qemu-kvm with ceph (rbd, rados) block device support, see:
  - https://launchpad.net/~kirkland/+archive/virt/+packages
 - MIR all of ceph for hosting ceph
 - include latest libvirt rbd support (for rbd authentication)
 - Existing Openstack Support
   - Nova since cactus can use CEPH for block
   - Diablo added glance support for CEPH for image storage
 - Dreamhost using mainline BTRFS and debian kernel for current deployment
- Dreamhost launching at scale in a few "weeks"
- CEPH is an independent business unit under Dreamhost
- Dreamhost using fastcgi + apache for rados gateway (can use nginx, too)

 Dependencies:
 modfast-cgi
Concerns;
- Upstream makes a release every 2 weeks
- No stable release branches upstream
- Limited deployment outside Dreamhost
- unencrypted over the wire
  - apps can implement security on top of it
  - IPv6 is supported
Additional Opportunities:
- Integrate tightly with OpenStack in packaging
- Add support for ceph in juju openstack charms
- BTRFS ideal, XFS also working well, ext4 missing "large xattr" support
- Upstream asserts that CEPH is under heavy development (cmdline programs remind user at every execution)
 - in the openstack use case, for kvm, there is no need for kernel code at all
  - if we want to support xen, it would require using the block device kernel code for rdb
Support Targets:
- RBD

(?)

Work Items

Dependency tree

* Blueprints in grey have been implemented.