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doc: update the rbd-nbd doc with log strategies options

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Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
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Prasanna Kumar Kalever 2021-09-02 00:42:00 +05:30 committed by mergify[bot]
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commit 22bb31df19
1 changed files with 27 additions and 17 deletions
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docs/rbd-nbd.md
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@ -31,38 +31,48 @@ in the StorageClass.
### Configuring logging path
If you are using the default rbd nodeplugin daemonset and StorageClass
If you are using the default rbd nodePlugin DaemonSet and StorageClass
templates then `cephLogDir` will be `/var/log/ceph`, this directory will be
a host-path and the default log file path will be
`/var/log/ceph/rbd-nbd-<volID>.log`. rbd-nbd creates a log file per volume
under the `cephLogDir` path on NodeStage(map) and removed the same on
the respective NodeUnstage(unmap).
In case if you need a customized log path, you should do below:
- There are different strategies to maintain the logs
- `remove`: delete log file on unmap/detach (default behaviour)
- `compress`: compress the log file to gzip on unmap/detach, in case there
exists a `.gz` file from previous map/unmap of the same volume, then
override the previous log with new log.
- `preserve`: preserve the log file in text format
- Edit the daemonset templates to change the ceph log directory host-path
- If you are using helm charts, then you can use key `cephLogDirHostPath`
You can tweak the log strategies through `cephLogStrategy` option from the
storageclass yaml
```
helm install --set cephLogDirHostPath=/var/log/ceph-csi/my-dir
```
- In case if you need a customized log path, you should do below:
- For standard templates edit [csi-rbdplugin.yaml](../deploy/rbd/kubernetes/csi-rbdplugin.yaml)
to update `hostPath` for `ceph-logdir`, also edit psp [csi-nodeplugin-psp.yaml](../deploy/rbd/kubernetes/csi-nodeplugin-psp.yaml)
to update `pathPrefix` spec entries.
- Update the StorageClass with the customized log directory path
- Now update rbd StorageClass for `cephLogDir`, for example
- Edit the DaemonSet templates to change the ceph log directory host-path
- If you are using helm charts, then you can use key `cephLogDirHostPath`
```
cephLogDir: "/var/log/prod-A-logs"
```
```
helm install --set cephLogDirHostPath=/var/log/ceph-csi/my-dir
```
- For standard templates edit [csi-rbdplugin.yaml](../deploy/rbd/kubernetes/csi-rbdplugin.yaml)
to update `hostPath` for `ceph-logdir`, also edit psp [csi-nodeplugin-psp.yaml](../deploy/rbd/kubernetes/csi-nodeplugin-psp.yaml)
to update `pathPrefix` spec entries.
- Update the StorageClass with the customized log directory path
- Now update rbd StorageClass for `cephLogDir`, for example
```
cephLogDir: "/var/log/prod-A-logs"
```
`NOTE`:
- On uninstall make sure to delete `cephLogDir` on host manually to freeup
some space just in case if there are any uncleaned log files.
- In case if you do not need the rbd-nbd logging to persistent, then just
update the StorageClass for `cephLogDir` to use a non-persistent path.
- In case if you do not need the rbd-nbd logging to persistent at all, then
simply update the StorageClass for `cephLogDir` to use a non-persistent path.
## Status