mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-10 00:10:20 +00:00
160 lines
6.7 KiB
Markdown
160 lines
6.7 KiB
Markdown
# Steps and RBD CLI commands for RBD snapshot and clone operations
|
|
|
|
- [Steps and RBD CLI commands for RBD snapshot and clone operations](#steps-and-rbd-cli-commands-for-rbd-snapshot-and-clone-operations)
|
|
- [Create a snapshot from PVC](#create-a-snapshot-from-pvc)
|
|
- [steps to create a snapshot](#steps-to-create-a-snapshot)
|
|
- [RBD CLI commands to create snapshot](#rbd-cli-commands-to-create-snapshot)
|
|
- [Create PVC from a snapshot (datasource snapshot)](#create-pvc-from-a-snapshot-datasource-snapshot)
|
|
- [steps to create a pvc from snapshot](#steps-to-create-a-pvc-from-snapshot)
|
|
- [RBD CLI commands to create clone from snapshot](#rbd-cli-commands-to-create-clone-from-snapshot)
|
|
- [Delete a snapshot](#delete-a-snapshot)
|
|
- [steps to delete a snapshot](#steps-to-delete-a-snapshot)
|
|
- [RBD CLI commands to delete a snapshot](#rbd-cli-commands-to-delete-a-snapshot)
|
|
- [Delete a Volume (PVC)](#delete-a-volume-pvc)
|
|
- [steps to delete a volume](#steps-to-delete-a-volume)
|
|
- [RBD CLI commands to delete a volume](#rbd-cli-commands-to-delete-a-volume)
|
|
- [Volume cloning (datasource pvc)](#volume-cloning-datasource-pvc)
|
|
- [steps to create a Volume from Volume](#steps-to-create-a-volume-from-volume)
|
|
- [RBD CLI commands to create a Volume from Volume](#rbd-cli-commands-to-create-a-volume-from-volume)
|
|
|
|
This document outlines the command used to create RBD snapshot, delete RBD
|
|
snapshot, Restore RBD snapshot and Create new RBD image from existing RBD image.
|
|
|
|
## Create a snapshot from PVC
|
|
|
|
Refer [snapshot](https://kubernetes.io/docs/concepts/storage/volume-snapshots/)
|
|
for more information related to Volume cloning in kubernetes.
|
|
|
|
### steps to create a snapshot
|
|
|
|
- Check if the parent image has more snapshots than the configured value, if
|
|
it has more snapshot, add tasks to flatten all the temporary cloned images
|
|
and return ResourceExhausted error message
|
|
- Create a temporary snapshot from the parent image
|
|
- Clone a new image from a temporary snapshot with options
|
|
`--rbd-default-clone-format 2 --image-feature layering,deep-flatten`
|
|
- Delete temporary snapshot created
|
|
- Check the image chain depth, if the `softlimit` is reached add a task to flatten
|
|
the cloned image and return success. If the depth is reached `hardlimit` add a
|
|
task flatten the cloned image and return snapshot status ready as `false`
|
|
|
|
### RBD CLI commands to create snapshot
|
|
|
|
```
|
|
rbd snap ls <RBD image for src k8s volume> --all
|
|
|
|
// If the parent has more snapshots than the configured `maxsnapshotsonimage`
|
|
// add background tasks to flatten the temporary cloned images (temporary cloned
|
|
// image names will be same as snapshot names)
|
|
ceph rbd task add flatten <RBD image for temporary snap images>
|
|
|
|
rbd snap create <RBD image for src k8s volume>@<random snap name>
|
|
rbd clone --rbd-default-clone-format 2 --image-feature
|
|
layering,deep-flatten <RBD image for src k8s volume>@<random snap>
|
|
<RBD image for temporary snap image>
|
|
rbd snap rm <RBD image for src k8s volume>@<random snap name>
|
|
rbd snap create <RBD image for temporary snap image>@<random snap name>
|
|
|
|
// check the depth, if the depth is greater than configured hardlimit add a
|
|
// task to flatten the cloned image, return snapshot status ready as `false`,
|
|
// if the depth is greater than softlimit add a task to flatten the image
|
|
// and return success
|
|
ceph rbd task add flatten <RBD image for temporary snap image>
|
|
```
|
|
|
|
## Create PVC from a snapshot (datasource snapshot)
|
|
|
|
### steps to create a pvc from snapshot
|
|
|
|
- Check the depth(n) of the cloned image if `n>=(hardlimit -2)`, add task to
|
|
flatten the image and return ABORT (to avoid image leak)
|
|
- Clone a new image from the snapshot with user-provided options
|
|
|
|
### RBD CLI commands to create clone from snapshot
|
|
|
|
```
|
|
// check the depth, if the depth is greater than configured (hardlimit)
|
|
// Add a task to value flatten the cloned image
|
|
ceph rbd task add flatten <RBD image for temporary snap image>
|
|
|
|
rbd clone --rbd-default-clone-format 2 --image-feature <k8s dst vol config>
|
|
<RBD image for temporary snap image>@<random snap name>
|
|
<RBD image for k8s dst vol>
|
|
// check the depth,if the depth is greater than configured hardlimit add a task
|
|
// to flatten the cloned image return ABORT error, if the depth is greater than
|
|
// softlimit add a task to flatten the image and return success
|
|
ceph rbd task add flatten <RBD image for k8s dst vol>
|
|
```
|
|
|
|
## Delete a snapshot
|
|
|
|
### steps to delete a snapshot
|
|
|
|
- Delete temporary snapshot on temporary cloned image
|
|
- Move the temporary cloned image to trash
|
|
- Add task to remove the image from trash
|
|
|
|
### RBD CLI commands to delete a snapshot
|
|
|
|
```
|
|
rbd snap create <RBD image for temporary snap image>@<random snap name>
|
|
rbd trash mv <RBD image for temporary snap image>
|
|
ceph rbd task trash remove <RBD image for temporary snap image ID>
|
|
```
|
|
|
|
## Delete a Volume (PVC)
|
|
|
|
With earlier implementation to delete the image we used to add a task to remove
|
|
the image. With new changes this cannot be done as the image may contains
|
|
snapshots or linking, so we will be following below steps to delete an
|
|
image(this will be applicable for both normal image and cloned image)
|
|
|
|
### steps to delete a volume
|
|
|
|
- Move the rbd image to trash
|
|
- Add task to remove the image from trash
|
|
|
|
### RBD CLI commands to delete a volume
|
|
|
|
```
|
|
1) rbd trash mv <image>
|
|
2) ceph rbd task trash remove <image>
|
|
```
|
|
|
|
## Volume cloning (datasource pvc)
|
|
|
|
Refer
|
|
[volume-cloning](https://kubernetes.io/docs/concepts/storage/volume-pvc-datasource/)
|
|
for more information related to Volume cloning in kubernetes.
|
|
|
|
### steps to create a Volume from Volume
|
|
|
|
- Check the depth(n) of the cloned image if `n>=((hard limit) -2)`, add task to
|
|
flatten the image and return ABORT (to avoid image leak)
|
|
- Create snapshot of rbd image
|
|
- Clone the snapshot (temp clone)
|
|
- Delete the snapshot
|
|
- Snapshot the temp clone
|
|
- Clone the snapshot (final clone)
|
|
- Delete the snapshot
|
|
|
|
### RBD CLI commands to create a Volume from Volume
|
|
|
|
```
|
|
// check the image depth of the parent image if flatten required add a
|
|
// task to flatten image and return ABORT to avoid leak(same hardlimit and
|
|
// softlimit check will be done)
|
|
ceph rbd task add flatten <RBD image for src k8s volume>
|
|
|
|
rbd snap create <RBD image for src k8s volume>@<random snap name>
|
|
rbd clone --rbd-default-clone-format 2 --image-feature
|
|
layering,deep-flatten <RBD image for src k8s volume>@<random snap>
|
|
<RBD image for temporary snap image>
|
|
rbd snap rm <RBD image for src k8s volume>@<random snap name>
|
|
rbd snap create <RBD image for temporary snap image>@<random snap name>
|
|
rbd clone --rbd-default-clone-format 2 --image-feature <k8s dst vol config>
|
|
<RBD image for temporary snap image>@<random snap name>
|
|
<RBD image for k8s dst vol>
|
|
rbd snap rm <RBD image for src k8s volume>@<random snap name>
|
|
```
|