mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-18 02:50:30 +00:00
Add resize doc for both filesystem and block mode PVCs
Signed-off-by: Humble Chirammal <hchiramm@redhat.com>
This commit is contained in:
Humble Chirammal
mergify[bot]
parent
e0cc7740f6
commit
866bc7da21
268
docs/resize-pvc.md
Normal file
268
docs/resize-pvc.md
Normal file
@ -0,0 +1,268 @@
|
||||
# Resize RBD PVCs
|
||||
|
||||
For filesystem resize to be supported for your kubernetes
|
||||
cluster, the kubernetes version running in your cluster
|
||||
should be >= v1.15 and for block volume resize support
|
||||
the kubernetes version should be >=1.16. Also, `ExpandCSIVolumes`
|
||||
feature gate has to be enabled for the volume resize
|
||||
functionality to work.
|
||||
|
||||
- [Resize RBD PVCs](#resize-rbd-pvcs)
|
||||
- [Filesystem resize on RBD filesystem volume mode PVCs](#filesystem-resize-on-rbd-filesystem-volume-mode-pvcs)
|
||||
- [Resize Block PVC](#resize-block-pvc)
|
||||
|
||||
## Filesystem resize on RBD filesystem volume mode PVCs
|
||||
|
||||
pvc.yaml
|
||||
|
||||
```
|
||||
apiVersion: v1
|
||||
items:
|
||||
- apiVersion: v1
|
||||
kind: PersistentVolumeClaim
|
||||
metadata:
|
||||
annotations:
|
||||
pv.kubernetes.io/bind-completed: "yes"
|
||||
pv.kubernetes.io/bound-by-controller: "yes"
|
||||
volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
|
||||
creationTimestamp: "2019-12-19T05:44:45Z"
|
||||
finalizers:
|
||||
- kubernetes.io/pvc-protection
|
||||
name: rbd-pvc
|
||||
namespace: default
|
||||
resourceVersion: "3557"
|
||||
selfLink: /api/v1/namespaces/default/persistentvolumeclaims/rbd-pvc
|
||||
uid: efe688d6-a420-4041-900e-c5e19fd73ebf
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 1Gi
|
||||
storageClassName: csi-rbd-sc
|
||||
volumeMode: Filesystem
|
||||
volumeName: pvc-efe688d6-a420-4041-900e-c5e19fd73ebf
|
||||
status:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
capacity:
|
||||
storage: 1Gi
|
||||
phase: Bound
|
||||
kind: List
|
||||
metadata:
|
||||
resourceVersion: ""
|
||||
selfLink: ""
|
||||
```
|
||||
|
||||
- mounted Filesystem size in pod using this PVC
|
||||
|
||||
```
|
||||
[$]kubectl exec -it csi-rbd-demo-pod sh
|
||||
# df -h /var/lib/www/html
|
||||
Filesystem Size Used Avail Use% Mounted on
|
||||
/dev/rbd0 976M 2.6M 958M 1% /var/lib/www/html
|
||||
#
|
||||
|
||||
```
|
||||
|
||||
- Now resize the PVC by editing the PVC (pvc.spec.resource.requests.storage)
|
||||
|
||||
```bash
|
||||
[$]kubectl edit pvc rbd-pvc
|
||||
```
|
||||
|
||||
Check PVC status after editing the pvc storage
|
||||
|
||||
```console
|
||||
apiVersion: v1
|
||||
items:
|
||||
- apiVersion: v1
|
||||
kind: PersistentVolumeClaim
|
||||
metadata:
|
||||
annotations:
|
||||
pv.kubernetes.io/bind-completed: "yes"
|
||||
pv.kubernetes.io/bound-by-controller: "yes"
|
||||
volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
|
||||
creationTimestamp: "2019-12-19T05:44:45Z"
|
||||
finalizers:
|
||||
- kubernetes.io/pvc-protection
|
||||
name: rbd-pvc
|
||||
namespace: default
|
||||
resourceVersion: "4773"
|
||||
selfLink: /api/v1/namespaces/default/persistentvolumeclaims/rbd-pvc
|
||||
uid: efe688d6-a420-4041-900e-c5e19fd73ebf
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 10Gi
|
||||
storageClassName: csi-rbd-sc
|
||||
volumeMode: Filesystem
|
||||
volumeName: pvc-efe688d6-a420-4041-900e-c5e19fd73ebf
|
||||
status:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
capacity:
|
||||
storage: 1Gi
|
||||
conditions:
|
||||
- lastProbeTime: null
|
||||
lastTransitionTime: "2019-12-19T05:49:39Z"
|
||||
message: Waiting for user to (re-)start a pod to finish file system resize of
|
||||
volume on node.
|
||||
status: "True"
|
||||
type: FileSystemResizePending
|
||||
phase: Bound
|
||||
kind: List
|
||||
metadata:
|
||||
resourceVersion: ""
|
||||
selfLink: ""
|
||||
|
||||
```
|
||||
|
||||
Now you can see the pvc status as `FileSystemResizePending`, once the kubelet
|
||||
calls the NodeExpandVolume to resize the PVC on node, the `status conditions`
|
||||
and `status` will be updated
|
||||
|
||||
```bash
|
||||
[$]kubectl get pvc
|
||||
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
|
||||
rbd-pvc Bound pvc-efe688d6-a420-4041-900e-c5e19fd73ebf 10Gi RWO csi-rbd-sc 7m6s
|
||||
|
||||
```
|
||||
|
||||
- Now let us check the directory size inside the pod where PVC is mounted
|
||||
|
||||
```bash
|
||||
[$]kubectl exec -it csi-rbd-demo-pod sh
|
||||
# df -h /var/lib/www/html
|
||||
Filesystem Size Used Avail Use% Mounted on
|
||||
/dev/rbd0 9.9G 4.5M 9.8G 1% /var/lib/www/html
|
||||
```
|
||||
|
||||
now you can see the size of `/var/lib/www/html` is updated from 976M to 9.9G
|
||||
|
||||
## Resize Block PVC
|
||||
|
||||
```bash
|
||||
[$]kubectl get pvc raw-block-pvc -o yaml
|
||||
apiVersion: v1
|
||||
kind: PersistentVolumeClaim
|
||||
metadata:
|
||||
annotations:
|
||||
pv.kubernetes.io/bind-completed: "yes"
|
||||
pv.kubernetes.io/bound-by-controller: "yes"
|
||||
volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
|
||||
creationTimestamp: "2019-12-19T05:56:02Z"
|
||||
finalizers:
|
||||
- kubernetes.io/pvc-protection
|
||||
name: raw-block-pvc
|
||||
namespace: default
|
||||
resourceVersion: "6370"
|
||||
selfLink: /api/v1/namespaces/default/persistentvolumeclaims/raw-block-pvc
|
||||
uid: 54885275-7ca9-4b89-8e7e-c99f375d1174
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 1Gi
|
||||
storageClassName: csi-rbd-sc
|
||||
volumeMode: Block
|
||||
volumeName: pvc-54885275-7ca9-4b89-8e7e-c99f375d1174
|
||||
status:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
capacity:
|
||||
storage: 1Gi
|
||||
phase: Bound
|
||||
```
|
||||
|
||||
- Device size in pod using this PVC
|
||||
|
||||
```bash
|
||||
[$]kubectl exec -it pod-with-raw-block-volume sh
|
||||
sh-4.4# blockdev --getsize64 /dev/xvda
|
||||
1073741824
|
||||
```
|
||||
|
||||
rbd Block PVC is mounted at `/dev/xvda` of the pod, and the size is `1073741824`
|
||||
bytes which is equal to `1Gib`
|
||||
|
||||
- Now resize the PVC
|
||||
|
||||
To resize PVC, change `(pvc.spec.resource.requests.storage)` to the new size
|
||||
which should be greater than the current size.
|
||||
|
||||
```bash
|
||||
[$]kubectl edit pvc raw-block-pvc
|
||||
|
||||
```
|
||||
|
||||
Check PVC status after editing the pvc storage
|
||||
|
||||
```console
|
||||
apiVersion: v1
|
||||
kind: PersistentVolumeClaim
|
||||
metadata:
|
||||
annotations:
|
||||
pv.kubernetes.io/bind-completed: "yes"
|
||||
pv.kubernetes.io/bound-by-controller: "yes"
|
||||
volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
|
||||
creationTimestamp: "2019-12-19T05:56:02Z"
|
||||
finalizers:
|
||||
- kubernetes.io/pvc-protection
|
||||
name: raw-block-pvc
|
||||
namespace: default
|
||||
resourceVersion: "7923"
|
||||
selfLink: /api/v1/namespaces/default/persistentvolumeclaims/raw-block-pvc
|
||||
uid: 54885275-7ca9-4b89-8e7e-c99f375d1174
|
||||
spec:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
resources:
|
||||
requests:
|
||||
storage: 10Gi
|
||||
storageClassName: csi-rbd-sc
|
||||
volumeMode: Block
|
||||
volumeName: pvc-54885275-7ca9-4b89-8e7e-c99f375d1174
|
||||
status:
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
capacity:
|
||||
storage: 1Gi
|
||||
conditions:
|
||||
- lastProbeTime: null
|
||||
lastTransitionTime: "2019-12-19T06:02:15Z"
|
||||
message: Waiting for user to (re-)start a pod to finish file system resize of
|
||||
volume on node.
|
||||
status: "True"
|
||||
type: FileSystemResizePending
|
||||
phase: Bound
|
||||
|
||||
```
|
||||
|
||||
Now you can see the pvc stats as FileSystemResizePending, once the kubelet calls
|
||||
the NodeExpandVolume to resize the PVC on node, the status conditions will be updated
|
||||
and status.capacity.storage will be updated.
|
||||
|
||||
```bash
|
||||
|
||||
[$]kubectl get pvc
|
||||
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
|
||||
raw-block-pvc Bound pvc-efe688d6-a420-4041-900e-c5e19fd73ebf 10Gi RWO csi-rbd-sc 7m6s
|
||||
|
||||
```
|
||||
|
||||
Device size in pod using this PVC
|
||||
|
||||
```bash
|
||||
|
||||
[$]kubectl exec -it pod-with-raw-block-volume sh
|
||||
sh-4.4# blockdev --getsize64 /dev/xvda
|
||||
10737418240
|
||||
|
||||
```
|
||||
|
||||
rbd Block PVC is mounted at `/dev/xvda` of the pod, and the size is
|
||||
`10737418240` bytes which is equal to `10Gib`
|
||||
Loading…
Reference in New Issue
Block a user