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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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18
cmd/cephcsi.go
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@ -42,11 +42,11 @@ var (
endpoint = flag.String("endpoint", "unix://tmp/csi.sock", "CSI endpoint")
driverName = flag.String("drivername", "", "name of the driver")
nodeID = flag.String("nodeid", "", "node id")
instanceID = flag.String("instanceid", "", "Unique ID distinguishing this instance of Ceph CSI among other"+
" instances, when sharing Ceph clusters across CSI instances for provisioning")
// rbd related flags
containerized = flag.Bool("containerized", true, "whether run as containerized")
instanceID = flag.String("instanceid", "", "Unique ID distinguishing this instance of Ceph CSI among other"+
" instances, when sharing Ceph clusters across CSI instances for provisioning")
// cephfs related flags
volumeMounter = flag.String("volumemounter", "", "default volume mounter (possible options are 'kernel', 'fuse')")
@ -93,6 +93,8 @@ func getDriverName() string {
}
func main() {
var cp util.CachePersister
driverType := getType()
if len(driverType) == 0 {
klog.Fatalln("driver type not specified")
@ -112,13 +114,15 @@ func main() {
case cephfsType:
cephfs.PluginFolder = cephfs.PluginFolder + dname
cp, err := util.CreatePersistanceStorage(
cephfs.PluginFolder, *metadataStorage, dname)
if err != nil {
os.Exit(1)
if *metadataStorage != "" {
cp, err = util.CreatePersistanceStorage(
cephfs.PluginFolder, *metadataStorage, dname)
if err != nil {
os.Exit(1)
}
}
driver := cephfs.NewDriver()
driver.Run(dname, *nodeID, *endpoint, *volumeMounter, *mountCacheDir, cp)
driver.Run(dname, *nodeID, *endpoint, *volumeMounter, *mountCacheDir, *instanceID, cp)
default:
klog.Fatalln("invalid volume type", vtype) // calls exit