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248 lines
9.1 KiB
Markdown
248 lines
9.1 KiB
Markdown
# Static PVC with ceph-csi
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- [Static PVC with ceph-csi](#static-pvc-with-ceph-csi)
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- [RBD static PVC](#rbd-static-pvc)
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- [Create RBD image](#create-rbd-image)
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- [Create RBD static PV](#create-rbd-static-pv)
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- [RBD Volume Attributes in PV](#rbd-volume-attributes-in-pv)
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- [Create RBD static PVC](#create-rbd-static-pvc)
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- [CephFS static PVC](#cephfs-static-pvc)
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- [Create CephFS subvolume](#create-cephfs-subvolume)
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- [Create CephFS static PV](#create-cephfs-static-pv)
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- [Node stage secret ref in CephFS PV](#node-stage-secret-ref-in-cephfs-pv)
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- [CephFS volume attributes in PV](#cephfs-volume-attributes-in-pv)
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- [Create CephFS static PVC](#create-cephfs-static-pvc)
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This document outlines how to create static PV and static PVC from
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existing rbd image/cephFS volume.
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**warning** static PVC can be created, deleted, mounted and unmounted but
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currently ceph-csi doesn't support other operations like snapshot,clone,
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resize, etc for static PVC
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## RBD static PVC
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RBD images created manually can be mounted and unmounted to an app, below step
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shows how to create a rbd image, static PV, static PVC
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### Create RBD image
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If you already have a rbd image created and contains some data which you want
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to access by the application pod you can skip this step.
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Lets create a new rbd image in ceph cluster which we are going to use for
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static PVC
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```console
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rbd create static-image --size=1024 --pool=replicapool
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```
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### Create RBD static PV
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To create the rbd PV you need to know the `rbd image name`,`clusterID` and
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`pool` name in which the rbd image is created
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```yaml
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apiVersion: v1
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kind: PersistentVolume
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metadata:
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name: fs-static-pv
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spec:
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accessModes:
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- ReadWriteOnce
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capacity:
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storage: 1Gi
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csi:
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driver: rbd.csi.ceph.com
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fsType: ext4
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nodeStageSecretRef:
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# node stage secret name
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name: csi-rbd-secret
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# node stage secret namespace where above secret is created
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namespace: default
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volumeAttributes:
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# Required options from storageclass parameters need to be added in volumeAttributes
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"clusterID": "ba68226a-672f-4ba5-97bc-22840318b2ec"
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"pool": "replicapool"
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"staticVolume": "true"
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#mounter: rbd-nbd
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# volumeHandle should be same as rbd image name
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volumeHandle: static-image
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persistentVolumeReclaimPolicy: Retain
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# The volumeMode can be either `Filesystem` or `Block` if you are creating Filesystem PVC it should be `Filesystem`, if you are creating Block PV you need to change it to `Block`
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volumeMode: Filesystem
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```
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### RBD Volume Attributes in PV
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Below table explains the list of volume attributes can be set when creating a
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static RBD PV
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| Attributes | Description | Required |
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| :----------: | :--------------------------------------------------------------------------------------------------------------------------------------------------: | :------: |
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| clusterID | The clusterID is used by the CSI plugin to uniquely identify and use a Ceph cluster (this is the key in configmap created duing ceph-csi deployment) | Yes |
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| pool | The pool name in which rbd image is created | Yes |
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| staticVolume | Value must be set to `true` to mount and unmount static rbd PVC | yes |
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| mounter | If set to `rbd-nbd`, use `rbd-nbd` on nodes that have `rbd-nbd` and `nbd` kernel modules to map rbd images | No |
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**Note** ceph-csi does not supports rbd image deletion for static PV.
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`persistentVolumeReclaimPolicy` in PV spec must be set to `Retain` to avoid PV
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delete attempt in csi-provisioner.
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```bash
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$ kubectl create -f fs-static-pv.yaml
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persistentvolume/fs-static-pv created
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```
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### Create RBD static PVC
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To create the rbd PVC you need to know the PV name which is created above
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```yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: fs-static-pvc
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namespace: default
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spec:
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accessModes:
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# ReadWriteMany is only supported for Block PVC
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- ReadWriteOnce
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resources:
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requests:
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storage: 1Gi
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# The volumeMode can be either `Filesystem` or `Block` if you are creating Filesystem PVC it should be `Filesystem`, if you are creating Block PV you need to change it to `Block`
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volumeMode: Filesystem
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# volumeName should be same as PV name
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volumeName: fs-static-pv
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```
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```bash
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$ kubectl create -f fs-static-pvc.yaml
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persistentvolumeclaim/fs-static-pvc created
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```
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**Note** deleting PV and PVC does not removed the backend rbd image, user need to
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manually delete the rbd image if required
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## CephFS static PVC
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CephFS subvolume created manually can be mounted and unmounted to an app,
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below steps show how to create a CephFS subvolume, static PV and static PVC.
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### Create CephFS subvolume
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If you already have a CephFS subvolume created and contains some data
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which you want to access by the application pod you can skip this step.
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Lets create a new CephFS subvolume of size 1 GiB in ceph cluster which
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we are going to use for static PVC, before that we need to create
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the subvolumegroup. **myfs** is the filesystem name(volume name) inside
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which subvolume should be created.
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```console
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ceph fs subvolumegroup create myfs testGroup
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```
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```console
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ceph fs subvolume create myfs testSubVolume testGroup --size=1073741824
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```
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**Note:** volume here refers to the filesystem.
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### Create CephFS static PV
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To create the CephFS PV you need to know the `volume rootpath`, and `clusterID`,
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here is the command to get the root path in ceph cluster
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```bash
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$ ceph fs subvolume getpath myfs testSubVolume testGroup
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/volumes/testGroup/testSubVolume
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```
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```yaml
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apiVersion: v1
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kind: PersistentVolume
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metadata:
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name: cephfs-static-pv
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spec:
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accessModes:
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- ReadWriteMany
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capacity:
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storage: 1Gi
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csi:
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driver: cephfs.csi.ceph.com
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nodeStageSecretRef:
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# node stage secret name
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name: csi-cephfs-secret
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# node stage secret namespace where above secret is created
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namespace: default
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volumeAttributes:
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# Required options from storageclass parameters need to be added in volumeAttributes
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"clusterID": "ba68226a-672f-4ba5-97bc-22840318b2ec"
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"fsName": "myfs"
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"staticVolume": "true"
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"rootPath": /volumes/testGroup/testSubVolume
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# volumeHandle can be anything, need not to be same
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# as PV name or volume name. keeping same for brevity
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volumeHandle: cephfs-static-pv
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persistentVolumeReclaimPolicy: Retain
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volumeMode: Filesystem
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```
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### Node stage secret ref in CephFS PV
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For static CephFS PV to work, userID and userKey needs to be specified in the
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secret. Static PV will not work with adminID and adminKey.
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Format for the secret should be same as detailed [here](https://github.com/ceph/ceph-csi/blob/3e656769b71a3c43d95f6875ed4934c82a8046e7/examples/cephfs/secret.yaml#L7-L10).
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### CephFS volume attributes in PV
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Below table explains the list of volume attributes can be set when creating a
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static CephFS PV
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| Attributes | Description | Required |
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| :----------: | :--------------------------------------------------------------------------------------------------------------------------------------------------: | :------: |
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| clusterID | The clusterID is used by the CSI plugin to uniquely identify and use a Ceph cluster (this is the key in configmap created duing ceph-csi deployment) | Yes |
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| fsName | CephFS filesystem name into which the subvolume should be created/present | Yes |
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| staticVolume | Value must be set to `true` to mount and unmount static rbd PVC | Yes |
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| rootPath | Actual path of the subvolume in ceph cluster, can be retrieved by issuing getpath command as described above | Yes |
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**Note** ceph-csi does not supports CephFS subvolume deletion for static PV.
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`persistentVolumeReclaimPolicy` in PV spec must be set to `Retain` to avoid PV
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delete attempt in csi-provisioner.
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```bash
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$ kubectl create -f cephfs-static-pv.yaml
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persistentvolume/cephfs-static-pv created
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```
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### Create CephFS static PVC
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To create the CephFS PVC you need to know the PV name which is created above
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```yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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name: cephfs-static-pvc
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namespace: default
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spec:
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accessModes:
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- ReadWriteMany
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resources:
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requests:
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storage: 1Gi
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volumeMode: Filesystem
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# volumeName should be same as PV name
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volumeName: cephfs-static-pv
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```
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```bash
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$ kubectl create -f cephfs-static-pvc.yaml
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persistentvolumeclaim/cephfs-static-pvc created
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```
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**Note** deleting PV and PVC does not delete the backend CephFS subvolume,
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user needs to manually delete the CephFS subvolume if required.
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