|NO.Z.00250|——————————|CloudNative|——|KuberNetes&存储进阶.V16|——|Ceph.v10|ceph测试|PVC快照|
一、PVC快照
### --- PVC快照说明
~~~ 注意：PVC快照功能需要k8s 1.17+
~~~ 块存储快照具体原理和注意事项参考5节点方案二、创建snapshotClass
### --- 切换到创建目录
[root@k8s-master01 cephfs]# cd /root/rook/cluster/examples/kubernetes/ceph/csi/rbd
[root@k8s-master01 rbd]# kubectl create -f snapshotclass.yaml
volumesnapshotclass.snapshot.storage.k8s.io/csi-rbdplugin-snapclass created三、创建快照
### --- 首先在之前创建的MySQL容器里创建一个文件夹，并创建一个文件
[root@k8s-master01 rbd]# kubectl get po
NAME READY STATUS RESTARTS AGE
busybox 1/1 Running 2 130m
wordpress-mysql-6965fc8cc8-fvtrt 1/1 Running 0 69m### --- 进入容器并创建目录和文件并写入内容
[root@k8s-master01 rbd]# kubectl exec -ti wordpress-mysql-6965fc8cc8-fvtrt -- bash
root@wordpress-mysql-6965fc8cc8-fvtrt:/# ls
bin boot dev docker-entrypoint-initdb.d entrypoint.sh etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
root@wordpress-mysql-6965fc8cc8-fvtrt:/# cd /var/lib/mysql
root@wordpress-mysql-6965fc8cc8-fvtrt:/var/lib/mysql# ls
auto.cnf ib_logfile0 ib_logfile1 ibdata1 lost+found mysql performance_schema
root@wordpress-mysql-6965fc8cc8-fvtrt:/var/lib/mysql# mkdir test_snapshot
root@wordpress-mysql-6965fc8cc8-fvtrt:/var/lib/mysql# ls
auto.cnf ib_logfile0 ib_logfile1 ibdata1 lost+found mysql performance_schema test_snapshot
root@wordpress-mysql-6965fc8cc8-fvtrt:/var/lib/mysql# echo "test for snapshot" > test_snapshot/1.txt
root@wordpress-mysql-6965fc8cc8-fvtrt:/var/lib/mysql# cat test_snapshot/1.txt
test for snapshot四、修改snapshot.yaml文件的source pvc为创建的MySQL pvc：
~~~ # 修改为mysql-pv-claim
[root@k8s-master01 rbd]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mysql-pv-claim Bound pvc-a22e54cf-9d96-4070-b3a7-90a2fa73c249 30Gi RWO rook-ceph-block 71m
[root@k8s-master01 rbd]# vim snapshot.yaml
spec:
volumeSnapshotClassName: csi-rbdplugin-snapclass
source:
persistentVolumeClaimName: mysql-pv-claim五、创建快照及查看状态
[root@k8s-master01 rbd]# kubectl create -f snapshot.yaml
volumesnapshot.snapshot.storage.k8s.io/rbd-pvc-snapshot created
[root@k8s-master01 rbd]# kubectl create -f snapshot.yaml
volumesnapshot.snapshot.storage.k8s.io/rbd-pvc-snapshot created
[root@k8s-master01 rbd]# kubectl get volumesnapshotclass
NAME DRIVER DELETIONPOLICY AGE
csi-rbdplugin-snapclass rook-ceph.rbd.csi.ceph.com Delete 4m47s
[root@k8s-master01 rbd]# kubectl get volumesnapshot
NAME READYTOUSE SOURCEPVC SOURCESNAPSHOTCONTENT RESTORESIZE SNAPSHOTCLASS SNAPSHOTCONTENT CREATIONTIME AGE
rbd-pvc-snapshot true mysql-pv-claim 30Gi csi-rbdplugin-snapclass snapcontent-6168fda6-e2dd-484a-bab7-dc36d4db3515 19s 33s六、指定快照创建PVC：如果想要创建一个具有某个数据的PVC，可以从某个快照恢复：
[root@k8s-master01 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: 30Gi### --- 注意：dataSource为快照名称，storageClassName为新建pvc的storageClass，
~~~ storage的大小不能低于原pvc的大小，
[root@k8s-master01 rbd]# kubectl create -f pvc-restore.yaml
persistentvolumeclaim/rbd-pvc-restore created
[root@k8s-master01 rbd]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
mysql-pv-claim Bound pvc-a22e54cf-9d96-4070-b3a7-90a2fa73c249 30Gi RWO rook-ceph-block 82m
rbd-pvc-restore Bound pvc-9b93b53b-f96b-42ea-852f-3357df4135a4 30Gi RWO rook-ceph-block 4s七、PVC快照数据效验
### --- 创建一个容器，挂载该PVC，查看是否含有之前的文件：
[root@k8s-master01 rbd]# vim restore-check-snapshot-rbd.yaml
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: check-snapshot-restore
spec:
selector:
matchLabels:
app: check
strategy:
type: Recreate
template:
metadata:
labels:
app: check
spec:
containers:
- image: alpine:3.8
name: check
command:
- sh
- -c
- sleep 36000
volumeMounts:
- name: check-mysql-persistent-storage
mountPath: /mnt
volumes:
- name: check-mysql-persistent-storage
persistentVolumeClaim:
claimName: rbd-pvc-restore### --- 创建容器
[root@k8s-master01 rbd]# kubectl create -f restore-check-snapshot-rbd.yaml
deployment.apps/check-snapshot-restore created### --- 查看数据是否存在
[root@k8s-master01 rbd]# kubectl get po -owide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
busybox 1/1 Running 2 160m 172.17.125.1 k8s-node01 <none> <none>
check-snapshot-restore-64b85c5f88-sgtzt 1/1 Running 0 2m15s 172.27.14.210 k8s-node02 <none> <none>
wordpress-mysql-6965fc8cc8-fvtrt 1/1 Running 0 99m 172.25.244.207 k8s-master01 <none> <none>### --- 查看test-snapshot目录是否存在
[root@k8s-master01 rbd]# kubectl exec -ti check-snapshot-restore-64b85c5f88-sgtzt -- ls /mnt
test_snapshot### --- 查看创建的文件及文件内容
[root@k8s-master01 rbd]# kubectl exec -ti check-snapshot-restore-64b85c5f88-sgtzt -- ls /mnt/test_snapshot
1.txt
[root@k8s-master01 rbd]# kubectl exec -ti check-snapshot-restore-64b85c5f88-sgtzt -- cat /mnt/test_snapshot/1.txt
test for snapshot### --- 测试无误后清理数据（snapshotclass可以不删除，
~~~ 后期创建rbd快照直接用该snapshotclass即可）：
[root@k8s-master01 rbd]# kubectl delete -f restore-check-snapshot-rbd.yaml -f pvc-restore.yaml -f snapshot.yaml
deployment.apps "check-snapshot-restore" deleted
persistentvolumeclaim "rbd-pvc-restore" deleted
volumesnapshot.snapshot.storage.k8s.io "rbd-pvc-snapshot" deleted
Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
——W.S.Landor
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