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Make CephFS plugin stateless reusing RADOS based journal scheme

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This is a part of the stateless set of commits for CephCSI.

This commit removes the dependency on config maps to store cephFS provisioned
volumes, and instead relies on RADOS based objects and keys, and required
CSI VolumeID encoding to detect the provisioned volumes.

Changes:
- Provide backward compatibility to provisioned volumes by older plugin versions (1.0.0 or older)
- Remove Create/Delete support for statically provisioned volumes (fixes #382)
- Added namespace support to RADOS OMaps and used the same to store RADOS CSI objects and keys in the CephFS metadata pool
- Added support to mention fsname for CephFS provisioning (fixes #359)
- Changed field name in CSI Identifier to 'location', to denote a pool or fscid
- Updated mounter cache to use new scheme
- Required Helm manifests are updated
- Required documentation and other manifests are updated
- Made driver option 'metadatastorage' as optional, as fresh installs do not need to specify the same

Testing done:
- Create/Mount/Delete PVC
- Create/Delete 5 PVCs
- Mount version 1.0.0 PVC
- Delete version 1.0.0 PV
- Mount Statically defined PV/PVC/Pod
- Mount Statically defined version 1.0.0 PV/PVC/Pod
- Delete Statically defined version 1.0.0 PV/PVC/Pod
- Node restart when mounted to test mountcache
- Use InstanceID other than 'default'
- RBD basic round of tests, as namespace is added to OMaps
- csitest against ceph-fs plugin
  - NOTE: CephFS plugin still does not detect and address already created
  volumes but of a different size
- Test not providing any value to the metadata storage parameter

Signed-off-by: ShyamsundarR <srangana@redhat.com>
This commit is contained in:
ShyamsundarR
2019-05-28 15:03:18 -04:00
parent 1406f29dcd
commit b9cd0e18ad
35 changed files with 959 additions and 262 deletions
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15
examples/README.md
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@ -9,16 +9,13 @@ By default, they look for the YAML manifests in
`../../deploy/{rbd,cephfs}/kubernetes`.
You can override this path by running `$ ./plugin-deploy.sh /path/to/my/manifests`.
## Creating CSI configuration for RBD based provisioning
## Creating CSI configuration
**NOTE:** This section is not required for cephfs based provisioning, and SHOULD
be skipped.
For RBD based provisioning, the CSI plugin requires configuration information
regarding the Ceph cluster(s), that would host the RBD based block devices. This
The CSI plugin requires configuration information regarding the Ceph cluster(s),
that would host the dynamically or statically provisioned volumes. This
is provided by adding a per-cluster identifier (referred to as clusterID), and
the required monitor details for the same, as in the provided [sample config
map](./rbd/csi-config-map-sample.yaml).
map](./csi-config-map-sample.yaml).
Gather the following information from the Ceph cluster(s) of choice,
@ -31,12 +28,12 @@ Gather the following information from the Ceph cluster(s) of choice,
* Alternatively, choose a `<cluster-id>` value that is distinct per Ceph
cluster in use by this kubernetes cluster
Update the [sample config map](./rbd/csi-config-map-sample.yaml) with values
Update the [sample config map](./csi-config-map-sample.yaml) with values
from a Ceph cluster and replace `<cluster-id>` with the chosen clusterID, to
create the manifest for the config map which can be updated in the cluster
using the following command,
* `kubectl replace -f rbd/csi-config-map-sample.yaml`
* `kubectl replace -f ./csi-config-map-sample.yaml`
Storage class and snapshot class, using `<cluster-id>` as the value for the
option `clusterID`, can now be created on the cluster.