Diskless Nodes
Support for network-mounted root filesystems on nodes
Blueprint information
- Status:
- Complete
- Approver:
- Daniel Westervelt
- Priority:
- Undefined
- Drafter:
- None
- Direction:
- Approved
- Assignee:
- None
- Definition:
- Obsolete
- Series goal:
- None
- Implementation:
-
Informational
- Milestone target:
- None
- Started by
- Completed by
- Adam Collard
Whiteboard
Diskless nodes
==============
Prior work: https:/
Network-mounted root filesystems.
Ceph now has a tgt frontend. But that's slow.
Why?
* Because ARM
* Use existing nodes as compute nodes without wiping out the disks.
* Simple root disk re-use
* Less hardware in nodes
Options:
* Use cinder as per "prior work" above (cinder is a provisioning api, still need to use tgt)
* Boot with ephemeral image r/o and then use cinder in overlayfs mode to store write deltas
Questions:
* can we mount ceph volumes natively as a root filesystem? (smoser: yes, via userspace)
Cool stuff:
* could use ceph base images for ephemeral booting which saves cluster from having to download images
