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2945f7b669
MD014 - Dollar signs used before commands without showing output The dollar signs are unnecessary, it is easier to copy and paste and less noisy if the dollar signs are omitted. Especially when the command doesn't list the output, but if the command follows output we can use `$ ` (dollar+space) mainly to differentiate between command and its ouput. scenario 1: when command doesn't follow output ```console cd ~/work ``` scenario 2: when command follow output (use dollar+space) ```console $ ls ~/work file1 file2 dir1 dir2 ... ``` Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
388 lines
10 KiB
Markdown
388 lines
10 KiB
Markdown
# Dynamically Expand Volume
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- [Dynamically Expand Volume](#dynamically-expand-volume)
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- [Prerequisite](#prerequisite)
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- [Expand RBD PVCs](#expand-rbd-pvcs)
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- [Expand RBD Filesystem PVC](#expand-rbd-filesystem-pvc)
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- [Expand RBD Block PVC](#expand-rbd-block-pvc)
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- [Expand CephFS PVC](#expand-cephfs-pvc)
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- [Expand CephFS Filesystem PVC](#expand-cephfs-filesystem-pvc)
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## Prerequisite
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- For filesystem expansion to be supported for your kubernetes cluster, the
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kubernetes version running in your cluster should be >= v1.15 and for block
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volume expand support the kubernetes version should be >=1.16. Also,
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`ExpandCSIVolumes` feature gate has to be enabled for the volume expand
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functionality to work.
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- The controlling StorageClass must have `allowVolumeExpansion` set to `true`.
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### Expand RBD PVCs
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#### Expand RBD Filesystem PVC
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pvc.yaml
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```yaml
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apiVersion: v1
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items:
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- apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
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creationTimestamp: "2019-12-19T05:44:45Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: rbd-pvc
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namespace: default
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resourceVersion: "3557"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/rbd-pvc
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uid: efe688d6-a420-4041-900e-c5e19fd73ebf
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spec:
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accessModes:
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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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storageClassName: csi-rbd-sc
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volumeMode: Filesystem
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volumeName: pvc-efe688d6-a420-4041-900e-c5e19fd73ebf
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status:
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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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phase: Bound
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kind: List
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metadata:
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resourceVersion: ""
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selfLink: ""
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```
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- mounted Filesystem size in pod using this PVC
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```bash
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$ kubectl exec -it csi-rbd-demo-pod sh
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sh-4.4# df -h /var/lib/www/html
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Filesystem Size Used Avail Use% Mounted on
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/dev/rbd0 976M 2.6M 958M 1% /var/lib/www/html
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```
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- Now expand the PVC by editing the PVC (pvc.spec.resource.requests.storage)
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```bash
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kubectl edit pvc rbd-pvc
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```
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Check PVC status after editing the pvc storage
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```yaml
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apiVersion: v1
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items:
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- apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
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creationTimestamp: "2019-12-19T05:44:45Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: rbd-pvc
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namespace: default
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resourceVersion: "4773"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/rbd-pvc
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uid: efe688d6-a420-4041-900e-c5e19fd73ebf
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 10Gi
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storageClassName: csi-rbd-sc
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volumeMode: Filesystem
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volumeName: pvc-efe688d6-a420-4041-900e-c5e19fd73ebf
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status:
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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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conditions:
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- lastProbeTime: null
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lastTransitionTime: "2019-12-19T05:49:39Z"
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message: Waiting for user to (re-)start a pod to finish file system resize of
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volume on node.
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status: "True"
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type: FileSystemResizePending
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phase: Bound
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kind: List
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metadata:
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resourceVersion: ""
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selfLink: ""
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```
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Now you can see the PVC status as `FileSystemResizePending`, once the kubelet
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calls the NodeExpandVolume to expand the PVC on node, the `status conditions`
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and `status` will be updated
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```bash
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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rbd-pvc Bound pvc-efe688d6-a420-4041-900e-c5e19fd73ebf 10Gi RWO csi-rbd-sc 7m6s
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```
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- Now let us check the directory size inside the pod where PVC is mounted
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```bash
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$ kubectl exec -it csi-rbd-demo-pod sh
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sh-4.4# df -h /var/lib/www/html
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Filesystem Size Used Avail Use% Mounted on
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/dev/rbd0 9.9G 4.5M 9.8G 1% /var/lib/www/html
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```
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now you can see the size of `/var/lib/www/html` is updated from 976M to 9.9G
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#### Expand RBD Block PVC
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```bash
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$ kubectl get pvc raw-block-pvc -o yaml
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apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
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creationTimestamp: "2019-12-19T05:56:02Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: raw-block-pvc
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namespace: default
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resourceVersion: "6370"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/raw-block-pvc
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uid: 54885275-7ca9-4b89-8e7e-c99f375d1174
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spec:
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accessModes:
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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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storageClassName: csi-rbd-sc
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volumeMode: Block
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volumeName: pvc-54885275-7ca9-4b89-8e7e-c99f375d1174
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status:
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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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phase: Bound
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```
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- Device size in pod using this PVC
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```bash
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$ kubectl exec -it pod-with-raw-block-volume sh
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sh-4.4# blockdev --getsize64 /dev/xvda
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1073741824
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```
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rbd Block PVC is mounted at `/dev/xvda` of the pod, and the size is `1073741824`
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bytes which is equal to `1Gib`
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- Now expand the PVC
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To expand PVC, change `(pvc.spec.resource.requests.storage)` to the new size
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which should be greater than the current size.
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```bash
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kubectl edit pvc raw-block-pvc
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```
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Check PVC status after editing the pvc storage
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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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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: rbd.csi.ceph.com
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creationTimestamp: "2019-12-19T05:56:02Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: raw-block-pvc
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namespace: default
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resourceVersion: "7923"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/raw-block-pvc
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uid: 54885275-7ca9-4b89-8e7e-c99f375d1174
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spec:
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accessModes:
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- ReadWriteOnce
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resources:
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requests:
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storage: 10Gi
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storageClassName: csi-rbd-sc
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volumeMode: Block
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volumeName: pvc-54885275-7ca9-4b89-8e7e-c99f375d1174
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status:
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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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conditions:
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- lastProbeTime: null
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lastTransitionTime: "2019-12-19T06:02:15Z"
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message: Waiting for user to (re-)start a pod to finish file system resize of
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volume on node.
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status: "True"
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type: FileSystemResizePending
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phase: Bound
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```
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Now you can see the PVC stats as `FileSystemResizePending`, once the kubelet calls
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the NodeExpandVolume to expand the PVC on node, the status conditions will be updated
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and `status.capacity.storage` will be updated.
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```bash
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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raw-block-pvc Bound pvc-efe688d6-a420-4041-900e-c5e19fd73ebf 10Gi RWO csi-rbd-sc 7m6s
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```
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Device size in pod using this PVC
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```bash
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$ kubectl exec -it pod-with-raw-block-volume sh
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sh-4.4# blockdev --getsize64 /dev/xvda
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10737418240
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```
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rbd Block PVC is mounted at `/dev/xvda` of the pod, and the size is
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`10737418240` bytes which is equal to `10Gib`
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### Expand CephFS PVC
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#### Expand CephFS Filesystem PVC
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pvc.yaml
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```yaml
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apiVersion: v1
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items:
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- apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: cephfs.csi.ceph.com
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creationTimestamp: "2020-01-17T07:55:11Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: csi-cephfs-pvc
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namespace: default
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resourceVersion: "5955"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/csi-cephfs-pvc
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uid: b84d07c9-ea67-40b4-96b9-4a79669b1ccc
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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: 5Gi
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storageClassName: csi-cephfs-sc
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volumeMode: Filesystem
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volumeName: pvc-b84d07c9-ea67-40b4-96b9-4a79669b1ccc
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status:
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accessModes:
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- ReadWriteMany
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capacity:
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storage: 5Gi
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phase: Bound
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kind: List
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metadata:
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resourceVersion: ""
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selfLink: ""
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```
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- mounted Filesystem size in pod using this PVC
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```bash
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$ kubectl exec -it csi-cephfs-demo-pod sh
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sh-4.4# df -h /var/lib/www
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Filesystem Size Used Avail Use% Mounted on
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10.108.149.216:6789:/volumes/csi/csi-vol-b0a1bc79-38fe-11ea-adb6-1a2797ee96de 5.0G 0 5.0G 0% /var/lib/www
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```
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- Now expand the PVC by editing the PVC (pvc.spec.resource.requests.storage)
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```bash
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kubectl edit pvc csi-cephfs-pvc
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```
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Check PVC status after editing the PVC storage
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```yaml
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apiVersion: v1
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items:
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- apiVersion: v1
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kind: PersistentVolumeClaim
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metadata:
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annotations:
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pv.kubernetes.io/bind-completed: "yes"
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pv.kubernetes.io/bound-by-controller: "yes"
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volume.beta.kubernetes.io/storage-provisioner: cephfs.csi.ceph.com
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creationTimestamp: "2020-01-17T07:55:11Z"
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finalizers:
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- kubernetes.io/pvc-protection
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name: csi-cephfs-pvc
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namespace: default
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resourceVersion: "6902"
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selfLink: /api/v1/namespaces/default/persistentvolumeclaims/csi-cephfs-pvc
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uid: b84d07c9-ea67-40b4-96b9-4a79669b1ccc
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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: 10Gi
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storageClassName: csi-cephfs-sc
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volumeMode: Filesystem
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volumeName: pvc-b84d07c9-ea67-40b4-96b9-4a79669b1ccc
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status:
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accessModes:
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- ReadWriteMany
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capacity:
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storage: 10Gi
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phase: Bound
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kind: List
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metadata:
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resourceVersion: ""
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selfLink: ""
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```
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Now you can see the PVC status capacity storage is updated with request size
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```bash
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$ kubectl get pvc
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NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
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csi-cephfs-pvc Bound pvc-b84d07c9-ea67-40b4-96b9-4a79669b1ccc 10Gi RWX csi-cephfs-sc 6m26s
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```
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- Now let us check the directory size inside the pod where PVC is mounted
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```bash
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$ kubectl exec -it csi-cephfs-demo-pod sh
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sh-4.4# df -h /var/lib/www
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Filesystem Size Used Avail Use% Mounted on
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10.108.149.216:6789:/volumes/csi/csi-vol-b0a1bc79-38fe-11ea-adb6-1a2797ee96de 10G 0 10G 0% /var/lib/www
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```
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now you can see the size of `/var/lib/www` is updated from 5G to 10G
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