mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-23 06:40:23 +00:00
26 lines
1.1 KiB
Markdown
26 lines
1.1 KiB
Markdown
|
# Support for CSI `VolumeCondition` aka Volume Health Checker
|
||
|
|
|
||
|
|
## health-checker API
|
||
|
|
|
||
|
|
Under `internal/health-checker` the Manager for health-checking is
|
||
|
|
implemented. The Manager can start a checking process for a given path, return
|
||
|
|
the (un)healthy state and stop the checking process when the volume is not
|
||
|
|
needed anymore.
|
||
|
|
|
||
|
|
The Manager is responsible for creating a suitable checker for the requested
|
||
|
|
path. If the path is a block-device, the BlockChecker should be created. For a
|
||
|
|
filesystem path (directory), the FileChecker is appropriate.
|
||
|
|
|
||
|
|
## CephFS
|
||
|
|
|
||
|
|
The health-checker writes to the file `csi-volume-condition.ts` in the root of
|
||
|
|
the volume. This file contains a JSON formatted timestamp.
|
||
|
|
|
||
|
|
A new `data` directory is introduced for newly created volumes. During the
|
||
|
|
`NodeStageVolume` call the root of the volume is mounted, and the `data`
|
||
|
|
directory is bind-mounted inside the container when `NodePublishVolume` is
|
||
|
|
called.
|
||
|
|
|
||
|
|
The `data` directory makes it possible to place Ceph-CSI internal files in the
|
||
|
|
root of the volume, without that the user/application has access to it.
|