#作者：Unstopabler
PVC快照创建与恢复
1.pod使用pvc资源
这里先创建一个pvc示例，pvc资源内容如下
[root@k8s-master rbd]# cat pvc.yaml
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: rbd-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
storageClassName: rook-ceph-block
[root@k8s-master rbd]# kubectl apply -f pvc.yaml
创建pod资源，并使用pvc创建 rbd-pvc名称如下
[root@k8s-master rbd]# cat pod.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: csirbd-demo-pod
spec:
containers:
- name: web-server
image: nginx:latest
volumeMounts:
- name: mypvc
mountPath: /var/lib/www/html
volumes:
- name: mypvc
persistentVolumeClaim:
claimName: rbd-pvc
readOnly: false
[root@k8s-master rbd]#
[root@k8s-master rbd]# kubectl apply -f pod.yaml
查看创建pod资源
[root@k8s-master rbd]# kubectl get pod
NAME READY STATUS RESTARTS AGE
csirbd-demo-pod 1/1 Running 1 (16h ago) 17h
[root@k8s-master rbd]#
查看pvc运行状态
[root@k8s-master rbd]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
rbd-pvc Bound pvc-c3f84e95-1b63-44f7-bbaa-02ac4e05c064 1Gi RWO rook-ceph-block 17h
[root@k8s-master rbd]#
2.pod里面创建数据
[root@k8s-master rbd]# kubectl exec -it csirbd-demo-pod -- bash
root@csirbd-demo-pod:/# df -h
Filesystem Size Used Avail Use% Mounted on
overlay 17G 5.0G 13G 30% /
tmpfs 64M 0 64M 0% /dev
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sda2 17G 5.0G 13G 30% /etc/hosts
shm 64M 0 64M 0% /dev/shm
/dev/rbd0 974M 28K 958M 1% /var/lib/www/html
tmpfs 3.8G 12K 3.8G 1% /run/secrets/kubernetes.io/serviceaccount
tmpfs 2.0G 0 2.0G 0% /proc/acpi
tmpfs 2.0G 0 2.0G 0% /proc/scsi
tmpfs 2.0G 0 2.0G 0% /sys/firmware
root@csirbd-demo-pod:/# echo "hello rbd" > /var/lib/www/html/index1.html
root@csirbd-demo-pod:/# cat /var/lib/www/html/index1.html
hello rbd
root@csirbd-demo-pod:/#
3.创建rbd-pvc快照
[root@node1 rbd]# cat snapshot.yaml
---
# 1.17 <= K8s <= v1.19
# apiVersion: snapshot.storage.k8s.io/v1beta1
# K8s >= v1.20
apiVersion: snapshot.storage.k8s.io/v1
kind: VolumeSnapshot
metadata:
name: rbd-pvc-snapshot
spec:
volumeSnapshotClassName: csi-rbdplugin-snapclass
source:
persistentVolumeClaimName: rbd-pvc
[root@node1 rbd]#
[root@k8s-master rbd]# kubectl apply -f snapshot.yaml
volumesnapshot.snapshot.storage.k8s.io/rbd-pvc-snapshot created
[root@k8s-master rbd]#
查看卷rbd-pvc快照是否创建成功
[root@k8s-master rbd]# kubectl get volumesnapshot
NAME READYTOUSE SOURCEPVC SOURCESNAPSHOTCONTENT RESTORESIZE SNAPSHOTCLASS SNAPSHOTCONTENT CREATIONTIME AGE
rbd-pvc-snapshot true rbd-pvc 1Gi csi-rbdplugin-snapclass snapcontent-e6ba28ed-990f-4cdd-9bfa-a7d6ea19e655 29s 27s
[root@k8s-master rbd]#
[root@k8s-master rbd]# kubectl get volumesnapshotcontents.snapshot.storage.k8s.io
NAME READYTOUSE RESTORESIZE DELETIONPOLICY DRIVER VOLUMESNAPSHOTCLASS VOLUMESNAPSHOT VOLUMESNAPSHOTNAMESPACE AGE
snapcontent-e6ba28ed-990f-4cdd-9bfa-a7d6ea19e655 true 1073741824 Delete rook-ceph.rbd.csi.ceph.com csi-rbdplugin-snapclass rbd-pvc-snapshot default 91s
[root@k8s-master rbd]#
4.pod容器误删数据
[root@k8s-master rbd]# kubectl exec -it csirbd-demo-pod -- bash
root@csirbd-demo-pod:/# ls /var/lib/www/html/
index.html index1.html lost+found
root@csirbd-demo-pod:/# rm -fr /var/lib/www/html/index*
root@csirbd-demo-pod:/# ls /var/lib/www/html/
lost+found
root@csirbd-demo-pod:/#
5.pvc快照恢复
当容器中rbd块数据丢失或者误删除之后，快照功能就非常重要了，可以基于快照做数据恢复，通过pvc调用volumesnapshot
[root@node1 rbd]# cat pvc-restore.yaml
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: rbd-pvc-restore
spec:
storageClassName: rook-ceph-block
dataSource:
name: rbd-pvc-snapshot
kind: VolumeSnapshot
apiGroup: snapshot.storage.k8s.io
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
[root@node1 rbd]#
[root@k8s-master rbd]# kubectl apply -f pvc-restore.yaml
persistentvolumeclaim/rbd-pvc-restore created
[root@k8s-master rbd]#
[root@k8s-master rbd]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
rbd-pvc Bound pvc-c3f84e95-1b63-44f7-bbaa-02ac4e05c064 1Gi RWO rook-ceph-block 17h
rbd-pvc-restore Bound pvc-bf601bee-b8f8-437c-9b56-bf7fc7f32bb4 1Gi RWO rook-ceph-block 8s
[root@k8s-master rbd]#
6.pod挂载pvc验证数据
pod容器中调用pvc获取到快照中的数据
[root@k8s-master rbd]# cat pod-pvc-restore.yaml
---
apiVersion: v1
kind: Pod
metadata:
name: csirbd-restore-pod
spec:
containers:
- name: web-server
image: nginx:latest
volumeMounts:
- name: mypvc
mountPath: /var/lib/www/html
volumes:
- name: mypvc
persistentVolumeClaim:
claimName: rbd-pvc-restore
readOnly: false
[root@k8s-master rbd]# kubectl apply -f pod-pvc-restore.yaml
pod/csirbd-restore-pod created
[root@k8s-master rbd]# kubectl get pod -owide | grep csirbd-restore-pod
csirbd-restore-pod 1/1 Running 0 66s 10.244.2.81 k8s-node2 <none> <none>
[root@k8s-master rbd]#
进入容器验证查看数据
[root@k8s-master rbd]# kubectl exec -it csirbd-restore-pod -- df -h
Filesystem Size Used Avail Use% Mounted on
overlay 17G 4.9G 13G 29% /
tmpfs 64M 0 64M 0% /dev
tmpfs 2.0G 0 2.0G 0% /sys/fs/cgroup
/dev/sdb2 17G 4.9G 13G 29% /etc/hosts
shm 64M 0 64M 0% /dev/shm
/dev/rbd0 974M 32K 958M 1% /var/lib/www/html
tmpfs 3.8G 12K 3.8G 1% /run/secrets/kubernetes.io/serviceaccount
tmpfs 2.0G 0 2.0G 0% /proc/acpi
tmpfs 2.0G 0 2.0G 0% /proc/scsi
tmpfs 2.0G 0 2.0G 0% /sys/firmware
[root@k8s-master rbd]# kubectl exec -it csirbd-restore-pod -- ls /var/lib/www/html
index.html index1.html lost+found
[root@k8s-master rbd]#