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rbd: provide alternatives to preserve the ceph log files

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Currently, we delete the ceph client log file on unmap/detach.

This patch provides additional alternatives for users who would like to
persist the log files.

Strategies:
-----------
`remove`: delete log file on unmap/detach
`compress`: compress the log file to gzip on unmap/detach
`preserve`: preserve the log file in text format

Note that the default strategy will be remove on unmap, and these options
can be tweaked from the storage class

Compression size details example:

On Map: (with debug-rbd=20)
---------
$ ls -lh
-rw-r--r-- 1 root root 526K Sep  1 18:15
rbd-nbd-0001-0024-fed5480a-f00f-417a-a51d-31d8a8144c03-0000000000000003-d2e89c87-0b4d-11ec-8ea6-160f128e682d.log

On unmap:
---------
$ ls -lh
-rw-r--r-- 1 root root  33K Sep  1 18:15
rbd-nbd-0001-0024-fed5480a-f00f-417a-a51d-31d8a8144c03-0000000000000003-d2e89c87-0b4d-11ec-8ea6-160f128e682d.gz

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
This commit is contained in:
Prasanna Kumar Kalever
2021-09-01 17:23:43 +05:30
committed by mergify[bot]
parent 10bbb049f7
commit c9cc36d8db
8 changed files with 134 additions and 12 deletions
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charts/ceph-csi-rbd/README.md
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@ -152,6 +152,7 @@ charts and their default values.
| `storageclass.imageFeatures` | Specifies RBD image features | `layering` |
| `storageClass.mounter` | Specifies RBD mounter | `""` |
| `storageClass.cephLogDir` | ceph client log location, it is the target bindmount path used inside container | `"/var/log/ceph"` |
| `storageClass.cephLogStrategy` | ceph client log strategy, available options `remove` or `compress` or `preserve` | `"remove"` |
| `storageClass.volumeNamePrefix` | Prefix to use for naming RBD images | `""` |
| `storageClass.encrypted` | Specifies whether volume should be encrypted. Set it to true if you want to enable encryption | `""` |
| `storageClass.encryptionKMSID` | Specifies the encryption kms id | `""` |