CSI(Container Storage Interface)，旨在能为容器编排引擎和存储系统间建立一套标准的存储调用接口，通过该接口能为容器编排引擎提供存储服务。较过去FlexVolume的方案明显会更好一些，虽然官方会继续支持，但明显CSI才是未来。
目前阿里云ACK的CSI插件还处于公测阶段，今天来测试一下。
CSI相关组件
Plugin 插件：
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➜ ~ kubectl get pods -l app=csi-plugin
NAME READY STATUS RESTARTS AGE
csi-plugin-2kn6r 6/6 Running 0 4d20h
csi-plugin-7jb9x 6/6 Running 0 4d20h
csi-plugin-btxs7 6/6 Running 0 4d20h
csi-plugin-fnlx6 6/6 Running 0 4d20h
csi-plugin-nh7dx 6/6 Running 0 4d20h
csi-plugin-scs6p 6/6 Running 0 4d20h
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Provisioner:负责创建EBS
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➜ ~ kubectl get pods -l app=csi-provisioner
NAME READY STATUS RESTARTS AGE
csi-provisioner-0 4/4 Running 0 4d20h
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api-resources
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➜ ~ kubectl api-resources|grep csi
csidrivers storage.k8s.io false CSIDriver
csinodes storage.k8s.io false CSINode
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StorageClasses
默认提供5个StorageClass，分别对应不同类型的云盘。
| sc |
云盘类型 |
| alicloud-disk-available |
会通过efficiency、ssd、common的顺序依次尝试创建云盘 |
| alicloud-disk-efficiency |
创建essd类型云盘 |
| alicloud-disk-essd |
创建普通云盘 |
| alicloud-disk-essd |
创建ssd类型云盘 |
| alicloud-disk-topology |
创建高效云盘 |
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➜ ~ kubectl get sc
NAME PROVISIONER AGE
alicloud-disk-available diskplugin.csi.alibabacloud.com 4d20h
alicloud-disk-efficiency diskplugin.csi.alibabacloud.com 4d20h
alicloud-disk-essd diskplugin.csi.alibabacloud.com 4d20h
alicloud-disk-essd diskplugin.csi.alibabacloud.com 4d20h
alicloud-disk-topology diskplugin.csi.alibabacloud.com 4d20h
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创建应用
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apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: alicloud-disk-efficiency-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 20Gi
storageClassName: alicloud-disk-efficiency
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: nginx
labels:
app: nginx
spec:
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: nginx
image: nginx:1.17
ports:
- containerPort: 80
volumeMounts:
- name: alicloud-disk-efficiency-pvc
mountPath: "/data"
volumes:
- name: alicloud-disk-efficiency-pvc
persistentVolumeClaim:
claimName: alicloud-disk-efficiency-pvc
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storage: 20Gi 申请的磁盘空间大小最少20G
查看pvc
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➜ ~ kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
alicloud-disk-efficiency-pvc Bound disk-9dc00157-1591-11ea-9985-00163e0e39ac 20Gi RWO alicloud-disk-efficiency 2m14s
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查看 pv
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➜ ~ kubectl get pv
NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE
disk-9dc00157-1591-11ea-9985-00163e0e39ac 20Gi RWO Delete Bound kube-system/alicloud-disk-efficiency-pvc alicloud-disk-efficiency 3m9s
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查看pod状态
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➜ ~ kubectl get pods
NAME READY STATUS RESTARTS AGE
nginx-54fdbdf4dc-5bvpz 1/1 Running 0 21s
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查看pod 磁盘挂载情况
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➜ ~ kubectl exec nginx-54fdbdf4dc-5bvpz -- df -ah
Filesystem Size Used Avail Use% Mounted on
overlay 50G 4.5G 43G 10% /
proc 0 0 0 - /proc
tmpfs 64M 0 64M 0% /dev
devpts 0 0 0 - /dev/pts
sysfs 0 0 0 - /sys
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
cgroup 0 0 0 - /sys/fs/cgroup/systemd
cgroup 0 0 0 - /sys/fs/cgroup/cpu,cpuacct
cgroup 0 0 0 - /sys/fs/cgroup/net_cls,net_prio
cgroup 0 0 0 - /sys/fs/cgroup/blkio
cgroup 0 0 0 - /sys/fs/cgroup/perf_event
cgroup 0 0 0 - /sys/fs/cgroup/devices
cgroup 0 0 0 - /sys/fs/cgroup/freezer
cgroup 0 0 0 - /sys/fs/cgroup/memory
cgroup 0 0 0 - /sys/fs/cgroup/hugetlb
cgroup 0 0 0 - /sys/fs/cgroup/pids
cgroup 0 0 0 - /sys/fs/cgroup/cpuset
mqueue 0 0 0 - /dev/mqueue
/dev/vdb 20G 45M 20G 1% /data
...
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可以看到/dev/vdb 20G 45M 20G 1% /data 已mount进来
查看管理后台
查看CSI组件
provisinoer
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➜ kubectl -n kube-system get sts csi-provisioner
NAME READY AGE
csi-provisioner 1/1 4d16h
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plugin
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➜kubectl -n kube-system get ds csi-plugin
NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
csi-plugin 4 4 4 4 4 <none> 4d16h
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删除
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kubectl delete -f nginx.yaml
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参考
http://newto.me/k8s-csi-design/