存储是容器编排中非常重要的一部分。Kubernetes从v1.2开始，提供了dynamic provisioning这一强大的特性，可以给集群提供按需分配的存储，并能支持包括AWS-EBS、GCE-PD、Cinder-Openstack、Ceph、GlusterFS等多种云存储。非官方支持的存储也可以通过编写plugin方式支持。
在没有dynamic provisioning时，容器为了使用Volume，需要预先在存储端分配好，这个过程往往是管理员手动的。在引入dynamic provisioning之后，Kubernetes会根据容器所需的volume大小，通过调用存储服务的接口，动态地创建满足所需的存储。
管理员可以配置storageclass，来描述所提供存储的类型。以AWS-EBS为例，管理员可以分别定义两种storageclass: slow和fast。slow对接sc1(机械硬盘)，fast对接gp2（固态硬盘）。应用可以根据业务的性能需求，分别选择两种storageclass。
GlusterFS是一个开源的分布式文件系统，具有强大的横向扩展能力，通过扩展能够支持数PB存储容量和处理数千客户端。GlusterFS借助TCP/IP或InfiniBandRDMA网络将物理分布的存储资源聚集在一起，使用单一全局命名空间来管理数据。
Heketi（https://github.com/heketi/heketi），是一个基于RESTful API的GlusterFS卷管理框架。Heketi可以方便地和云平台整合，提供RESTful API供Kubernetes调用，实现多GlusterFS集群的卷管理。另外，Heketi还有保证bricks和它对应的副本均匀分布在集群中的不同可用区的优点。
部署环境
Kubernetes配置
[root@rancher-server ~]# kubectl get nodes
NAME STATUS AGE
rancher-node1.novalocal Ready 3h
rancher-node2.novalocal Ready 3h
rancher-node3.novalocal Ready 3h
rancher-node4.novalocal Ready 3h
rancher-node5.novalocal Ready 3h
rancher-node6.novalocal Ready 2h
挂载云硬盘到rancher-node4.novalocal、rancher-node5.novalocal、rancher-node6.novalocal上
部署GlusterFS
克隆个GlusterFS Kubernetes配置项目地址
git clone https://github.com/gluster/gluster-kubernetes.git
修改部署脚本，Heketi Service需要在Kubernetes集群外部访问，所以要将服务端口导出
442 heketi_service=""
443 debug -n "Determining heketi service URL … "
# 等待负载均衡服务配置完成
444 sleep 120
445 while [[ "x${heketi_service}" == "x" ]]; do
446 if [[ "${CLI}" == *oc ]]; then
447 heketi_service=$(${CLI} describe routes/deploy-heketi | grep "Requested Host:" | awk '{print $3}')
448 else
449 # ${CLI} describe svc/deploy-heketi -n ${NAMESPACE}
450 heketi_service_ip=$(${CLI} describe svc/deploy-heketi -n ${NAMESPACE} | grep "LoadBalancer Ingress:" | awk '{print $3}')
451 heketi_service_port=$(${CLI} describe svc/deploy-heketi -n ${NAMESPACE} | grep "Port:" | grep -v "NodePort" | awk '{print $3}' | awk -F'/' '{print $1}')
452 heketi_service="${heketi_service_ip}:${heketi_service_port}"
453 echo "heketi_service: ${heketi_service}"
454 fi
455 sleep 1
456 done
457 debug “OK"
......
507 heketi_service=""
508 debug -n "Determining heketi service URL … "
# 等待负载均衡服务配置完成
509 sleep 120
510 while [[ "x${heketi_service}" == "x" ]]; do
511 if [[ "${CLI}" == *oc ]]; then
512 heketi_service=$(${CLI} describe routes/heketi | grep "Requested Host:" | awk '{print $3}')
513 else
514 # ${CLI} describe svc/heketi -n ${NAMESPACE}
515 heketi_service_ip=$(${CLI} describe svc/heketi -n ${NAMESPACE} | grep "LoadBalancer Ingress:" | awk '{print $3}')
516 heketi_service_port=$(${CLI} describe svc/heketi -n ${NAMESPACE} | grep "Port:" | grep -v "NodePort" | awk '{print $3}' | awk -F'/' '{print $1}')
517 heketi_service="${heketi_service_ip}:${heketi_service_port}"
518 echo "heketi_service: ${heketi_service}"
519 fi
520 sleep 1
521 done
522 debug "OK"
修改Kubernetes模板配置文件
[root@rancher-server deploy]# cat kube-templates/deploy-heketi-deployment.yaml
---
kind: Service
apiVersion: v1
metadata:
name: deploy-heketi
labels:
glusterfs: heketi-service
deploy-heketi: support
annotations:
description: Exposes Heketi Service
spec:
# Heketi Service需要在Kubernetes集群外部访问，所以要将服务端口导出
type: LoadBalancer
selector:
name: deploy-heketi
ports:
- name: deploy-heketi
port: 8080
targetPort: 8080
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: deploy-heketi
labels:
glusterfs: heketi-deployment
deploy-heketi: heketi-deployment
annotations:
description: Defines how to deploy Heketi
spec:
replicas: 1
template:
metadata:
name: deploy-heketi
labels:
name: deploy-heketi
glusterfs: heketi-pod
spec:
serviceAccountName: heketi-service-account
containers:
- image: heketi/heketi:dev
imagePullPolicy: IfNotPresent
name: deploy-heketi
env:
- name: HEKETI_EXECUTOR
value: kubernetes
- name: HEKETI_KUBE_USE_SECRET
value: "y"
- name: HEKETI_FSTAB
value: "/var/lib/heketi/fstab"
- name: HEKETI_SNAPSHOT_LIMIT
value: '14'
- name: HEKETI_KUBE_GLUSTER_DAEMONSET
value: "y"
ports:
- containerPort: 8080
volumeMounts:
- name: db
mountPath: "/var/lib/heketi"
readinessProbe:
timeoutSeconds: 3
initialDelaySeconds: 3
httpGet:
path: "/hello"
port: 8080
livenessProbe:
timeoutSeconds: 3
initialDelaySeconds: 30
httpGet:
path: "/hello"
port: 8080
volumes:
- name: db
[root@rancher-server deploy]# cat kube-templates/heketi-deployment.yaml
---
kind: Service
apiVersion: v1
metadata:
name: heketi
labels:
glusterfs: heketi-service
deploy-heketi: support
annotations:
description: Exposes Heketi Service
spec:
type: LoadBalancer
selector:
name: heketi
ports:
- name: heketi
port: 8080
targetPort: 8080
---
kind: Deployment
apiVersion: extensions/v1beta1
metadata:
name: heketi
labels:
glusterfs: heketi-deployment
annotations:
description: Defines how to deploy Heketi
spec:
replicas: 1
template:
metadata:
name: heketi
labels:
name: heketi
glusterfs: heketi-pod
spec:
serviceAccountName: heketi-service-account
containers:
- image: heketi/heketi:dev
imagePullPolicy: IfNotPresent
name: heketi
env:
- name: HEKETI_EXECUTOR
value: kubernetes
- name: HEKETI_KUBE_USE_SECRET
value: "y"
- name: HEKETI_FSTAB
value: "/var/lib/heketi/fstab"
- name: HEKETI_SNAPSHOT_LIMIT
value: '14'
- name: HEKETI_KUBE_GLUSTER_DAEMONSET
value: "y"
ports:
- containerPort: 8080
volumeMounts:
- name: db
mountPath: "/var/lib/heketi"
readinessProbe:
timeoutSeconds: 3
initialDelaySeconds: 3
httpGet:
path: "/hello"
port: 8080
livenessProbe:
timeoutSeconds: 3
initialDelaySeconds: 30
httpGet:
path: "/hello"
port: 8080
volumes:
- name: db
glusterfs:
endpoints: heketi-storage-endpoints
path: heketidbstorage
编写拓扑配置文件
[root@rancher-server deploy]# cat topology.json
{
"clusters": [
{
"nodes": [
{
"node": {
"hostnames": {
"manage": [
"rancher-node4.novalocal"
],
"storage": [
"192.168.101.164"
]
},
"zone": 1
},
"devices": [
"/dev/vdb",
"/dev/vdc"
]
},
{
"node": {
"hostnames": {
"manage": [
"rancher-node5.novalocal"
],
"storage": [
"192.168.101.165"
]
},
"zone": 1
},
"devices": [
"/dev/vdb",
"/dev/vdc"
]
},
{
"node": {
"hostnames": {
"manage": [
"rancher-node6.novalocal"
],
"storage": [
"192.168.101.166"
]
},
"zone": 1
},
"devices": [
"/dev/vdb",
"/dev/vdc"
]
}
]
}
]
}
下载heketi客户端
[root@rancher-server deploy]# wget https://github.com/heketi/heketi/releases/download/v4.0.0/heketi-client-v4.0.0.linux.amd64.tar.gz
[root@rancher-server deploy]# tar xzvf heketi-client-v4.0.0.linux.amd64.tar.gz
[root@rancher-server deploy]# cp heketi-client/bin/heketi-cli /usr/local/bin/
[root@rancher-server deploy]# chmod +x /usr/local/bin/heketi-cli
部署服务
[root@rancher-server deploy]# ./gk-deploy -g -n kube-system -c kubectl
Welcome to the deployment tool for GlusterFS on Kubernetes and OpenShift.
Before getting started, this script has some requirements of the execution
environment and of the container platform that you should verify.
The client machine that will run this script must have:
* Administrative access to an existing Kubernetes or OpenShift cluster
* Access to a python interpreter 'python'
* Access to the heketi client 'heketi-cli'
Each of the nodes that will host GlusterFS must also have appropriate firewall
rules for the required GlusterFS ports:
* 2222 - sshd (if running GlusterFS in a pod)
* 24007 - GlusterFS Daemon
* 24008 - GlusterFS Management
* 49152 to 49251 - Each brick for every volume on the host requires its own
port. For every new brick, one new port will be used starting at 49152. We
recommend a default range of 49152-49251 on each host, though you can adjust
this to fit your needs.
In addition, for an OpenShift deployment you must:
* Have 'cluster_admin' role on the administrative account doing the deployment
* Add the 'default' and 'router' Service Accounts to the 'privileged' SCC
* Add the 'heketi-service-account' Service Account to the 'privileged' SCC
* Have a router deployed that is configured to allow apps to access services
running in the cluster
Do you wish to proceed with deployment?
[Y]es, [N]o? [Default: Y]:
Using Kubernetes CLI.
NAME STATUS AGE
kube-system Active 1h
Using namespace "kube-system".
serviceaccount "heketi-service-account" created
node "rancher-node4.novalocal" labeled
node "rancher-node5.novalocal" labeled
node "rancher-node6.novalocal" labeled
daemonset "glusterfs" created
Waiting for GlusterFS pods to start ... OK
service "deploy-heketi" created
deployment "deploy-heketi" created
Waiting for deploy-heketi pod to start ... OK
Name: deploy-heketi
Namespace: kube-system
Labels: deploy-heketi=support
glusterfs=heketi-service
Selector: name=deploy-heketi
Type: LoadBalancer
IP: 10.43.254.191
LoadBalancer Ingress: 10.101.1.162
Port: deploy-heketi 8080/TCP
NodePort: deploy-heketi 30985/TCP
Endpoints: 10.42.162.137:8080
Session Affinity: None
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
3m 3m 1 {service-controller } Normal CreatingLoadBalancer Creating load balancer
3m 3m 1 {service-controller } Normal CreatedLoadBalancer Created load balancer
heketi_service: 10.101.1.162:8080
Creating cluster ... ID: 1c2fe81a325b048710f3ad6d07ffbff8
Creating node rancher-node4.novalocal ... ID: bc49ff0bb218fcf2902cb706cdc00d6c
Adding device /dev/vdb ... OK
Adding device /dev/vdc ... OK
Creating node rancher-node5.novalocal ... ID: ea2d9a302006a87a622ac6bcac67555a
Adding device /dev/vdb ... OK
Adding device /dev/vdc ... OK
Creating node rancher-node6.novalocal ... ID: 5d09cd8351fd1e3dab25e251fa6a23d9
Adding device /dev/vdb ... OK
Adding device /dev/vdc ... OK
Saving heketi-storage.json
secret "heketi-storage-secret" created
endpoints "heketi-storage-endpoints" created
service "heketi-storage-endpoints" created
job "heketi-storage-copy-job" created
service "deploy-heketi" deleted
job "heketi-storage-copy-job" deleted
deployment "deploy-heketi" deleted
secret "heketi-storage-secret" deleted
service "heketi" created
deployment "heketi" created
Waiting for heketi pod to start ... OK
Name: heketi
Namespace: kube-system
Labels: deploy-heketi=support
glusterfs=heketi-service
Selector: name=heketi
Type: LoadBalancer
IP: 10.43.129.172
LoadBalancer Ingress: 10.101.1.165
Port: heketi 8080/TCP
NodePort: heketi 31078/TCP
Endpoints: 10.42.55.126:8080
Session Affinity: None
Events:
FirstSeen LastSeen Count From SubObjectPath Type Reason Message
--------- -------- ----- ---- ------------- -------- ------ -------
3m 3m 1 {service-controller } Normal CreatingLoadBalancer Creating load balancer
3m 3m 1 {service-controller } Normal CreatedLoadBalancer Created load balancer
heketi_service: 10.101.1.165:8080
heketi is now running.
错误处理
# 当重复执行部署脚本时会出现如下错误
Creating cluster ... ID: e9164fac33d6eb0096f76033c7c5d0d6
Creating node rancher-node3.novalocal ... ID: dd0af5202c46f4ed6710fa40f466663b
Adding device /dev/vdb ... Unable to add device: Unable to execute command on glusterfs-pcpjx: Can't initialize physical volume "/dev/vdb" of volume group "vg_6b153c6002e7983fcfc044d3ab8878d4" without -ff
# 登陆docker加-ff手动执行初始化操作
[root@rancher-node3 ~]# docker exec -ti f89 bash
[root@rancher-node3 /]# pvcreate -ff --metadatasize=128M --dataalignment=256K /dev/vdb
Really INITIALIZE physical volume "/dev/vdb" of volume group "vg_6b153c6002e7983fcfc044d3ab8878d4" [y/n]? y
WARNING: Forcing physical volume creation on /dev/vdb of volume group "vg_6b153c6002e7983fcfc044d3ab8878d4"
Physical volume "/dev/vdb" successfully created
导出HEKETI SERVER地址
[root@rancher-server deploy]# export HEKETI_CLI_SERVER=http://10.101.1.165:8080
查看拓扑信息
[root@rancher-server deploy]# heketi-cli topology info
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Volumes:
Name: heketidbstorage
Size: 32
Id: 9f08272aedc22b71abd71f2c2f6301d3
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Mount: 192.168.101.164:heketidbstorage
Mount Options: backup-volfile-servers=192.168.101.165,192.168.101.166
Durability Type: replicate
Replica: 3
Snapshot: Disabled
Bricks:
Id: 3443563006e26bb90ab35248a69299fc
Path: /var/lib/heketi/mounts/vg_be73db47e84d18b8cbeb393e4d75ce39/brick_3443563006e26bb90ab35248a69299fc/brick
Size (GiB): 32
Node: bc49ff0bb218fcf2902cb706cdc00d6c
Device: be73db47e84d18b8cbeb393e4d75ce39
Id: 9c14bb4250e8a7db29cae00dbf1828c0
Path: /var/lib/heketi/mounts/vg_1fe52210ca857e3c80b40f159afd18ea/brick_9c14bb4250e8a7db29cae00dbf1828c0/brick
Size (GiB): 32
Node: ea2d9a302006a87a622ac6bcac67555a
Device: 1fe52210ca857e3c80b40f159afd18ea
Id: b2ead217863feefd265d9103b43962ca
Path: /var/lib/heketi/mounts/vg_ee1f9901c50b8bc8497cce2a181cd452/brick_b2ead217863feefd265d9103b43962ca/brick
Size (GiB): 32
Node: 5d09cd8351fd1e3dab25e251fa6a23d9
Device: ee1f9901c50b8bc8497cce2a181cd452
Nodes:
Node Id: 5d09cd8351fd1e3dab25e251fa6a23d9
State: online
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Zone: 1
Management Hostname: rancher-node6.novalocal
Storage Hostname: 192.168.101.166
Devices:
Id:011a77329427848014186c0a1a9d50d1 Name:/dev/vdc State:online Size (GiB):199 Used (GiB):0 Free (GiB):199
Bricks:
Id:ee1f9901c50b8bc8497cce2a181cd452 Name:/dev/vdb State:online Size (GiB):199 Used (GiB):32 Free (GiB):167
Bricks:
Id:b2ead217863feefd265d9103b43962ca Size (GiB):32 Path: /var/lib/heketi/mounts/vg_ee1f9901c50b8bc8497cce2a181cd452/brick_b2ead217863feefd265d9103b43962ca/brick
Node Id: bc49ff0bb218fcf2902cb706cdc00d6c
State: online
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Zone: 1
Management Hostname: rancher-node4.novalocal
Storage Hostname: 192.168.101.164
Devices:
Id:1ba42526a340272a6565118ae86cb655 Name:/dev/vdb State:online Size (GiB):199 Used (GiB):0 Free (GiB):199
Bricks:
Id:be73db47e84d18b8cbeb393e4d75ce39 Name:/dev/vdc State:online Size (GiB):199 Used (GiB):32 Free (GiB):167
Bricks:
Id:3443563006e26bb90ab35248a69299fc Size (GiB):32 Path: /var/lib/heketi/mounts/vg_be73db47e84d18b8cbeb393e4d75ce39/brick_3443563006e26bb90ab35248a69299fc/brick
Node Id: ea2d9a302006a87a622ac6bcac67555a
State: online
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Zone: 1
Management Hostname: rancher-node5.novalocal
Storage Hostname: 192.168.101.165
Devices:
Id:1fe52210ca857e3c80b40f159afd18ea Name:/dev/vdc State:online Size (GiB):199 Used (GiB):32 Free (GiB):167
Bricks:
Id:9c14bb4250e8a7db29cae00dbf1828c0 Size (GiB):32 Path: /var/lib/heketi/mounts/vg_1fe52210ca857e3c80b40f159afd18ea/brick_9c14bb4250e8a7db29cae00dbf1828c0/brick
Id:7657b6d493bf403671636e0239428c65 Name:/dev/vdb State:online Size (GiB):199 Used (GiB):0 Free (GiB):199
Bricks:
列出volume
[root@rancher-server deploy]# heketi-cli volume list
Id:9f08272aedc22b71abd71f2c2f6301d3 Cluster:1c2fe81a325b048710f3ad6d07ffbff8 Name:heketidbstorage
查看volume信息
[root@rancher-server ~]# heketi-cli volume info 9f08272aedc22b71abd71f2c2f6301d3
Name: heketidbstorage
Size: 32
Volume Id: 9f08272aedc22b71abd71f2c2f6301d3
Cluster Id: 1c2fe81a325b048710f3ad6d07ffbff8
Mount: 192.168.101.164:heketidbstorage
Mount Options: backup-volfile-servers=192.168.101.165,192.168.101.166
Durability Type: replicate
Distributed+Replica: 3
生成endpoints配置文件并创建
[root@rancher-server deploy]# heketi-cli volume create --size=200 \
> --persistent-volume \
> --persistent-volume-endpoint=heketi-storage-endpoints >heketi-storage-endpoints.yaml
[root@rancher-server deploy]# cat heketi-storage-endpoints.yaml
{
"kind": "PersistentVolume",
"apiVersion": "v1",
"metadata": {
"name": "glusterfs-b510d672",
"creationTimestamp": null
},
"spec": {
"capacity": {
"storage": "200Gi"
},
"glusterfs": {
"endpoints": "heketi-storage-endpoints",
"path": "vol_b510d67274e2104df3d4e6ca84555aec"
},
"accessModes": [
"ReadWriteMany"
],
"persistentVolumeReclaimPolicy": "Retain"
},
"status": {}
}
[root@rancher-server deploy]# kubectl create -f heketi-storage-endpoints.yaml -n kube-system
persistentvolume "glusterfs-8b77713d" created
查看endpoints
[root@rancher-server deploy]# kubectl get endpoints -n kube-system
NAME ENDPOINTS AGE
heketi 10.42.55.126:8080 15m
heketi-storage-endpoints 192.168.101.164:1,192.168.101.165:1,192.168.101.166:1 17m
kube-controller-manager <none> 1h
kube-dns 10.42.108.229:53,10.42.108.229:53 1h
kube-scheduler <none> 1h
kubernetes-dashboard 10.42.31.157:9090 1h
查看StorageClass配置文件
[root@rancher-server deploy]# cat gluster-storage-class.yaml
apiVersion: storage.k8s.io/v1beta1
kind: StorageClass
metadata:
name: gluster-heketi
provisioner: kubernetes.io/glusterfs
parameters:
resturl: "http://10.101.1.165:8080"
restauthenabled: "flase"
restuser: "admin"
secretNamespace: "default"
secretName: "heketi-secret"
创建StorageClass
[root@rancher-server deploy]# kubectl create -f gluster-storage-class.yaml
storageclass "gluster-heketi" created
[root@rancher-server deploy]# kubectl get StorageClass
NAME TYPE
gluster-heketi kubernetes.io/glusterfs
查看PVC配置文件
[root@rancher-server deploy]# cat gluster-pvc.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: glusterfs-claim
annotations:
volume.beta.kubernetes.io/storage-class: gluster-heketi
spec:
accessModes:
- ReadWriteMany
resources:
requests:
storage: 5Gi
创建PVC
[root@rancher-server deploy]# kubectl create -f gluster-pvc.yaml
persistentvolumeclaim "glusterfs-claim” created
[root@rancher-server deploy]# kubectl get pvc
NAME STATUS VOLUME CAPACITY ACCESSMODES AGE
glusterfs-claim Bound pvc-3777ed68-f18c-11e6-9e78-7aebc4e21f54 5Gi RWX 43s
[root@rancher-server deploy]# kubectl describe pvc glusterfs-claim
Name: glusterfs-claim
Namespace: default
StorageClass: gluster-heketi
Status: Bound
Volume: pvc-3777ed68-f18c-11e6-9e78-7aebc4e21f54
Labels: <none>
Capacity: 5Gi
Access Modes: RWX
查看busybox应用配置文件
[root@rancher-server deploy]# cat app.yaml
apiVersion: v1
kind: Pod
metadata:
name: busybox
spec:
containers:
- image: busybox
command:
- sleep
- "3600"
name: busybox
volumeMounts:
- mountPath: /usr/share/busybox
name: mypvc
volumes:
- name: mypvc
persistentVolumeClaim:
claimName: glusterfs-claim
创建应用
[root@rancher-server deploy]# kubectl create -f app.yaml
pod "busybox" created
[root@rancher-server deploy]# kubectl get pods -o wide
NAME READY STATUS RESTARTS AGE IP NODE
busybox 1/1 Running 0 1m 10.42.143.75 rancher-node3.novalocal
[root@rancher-node3 ~]# docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
107200c3da74 busybox "sleep 3600" About a minute ago Up About a minute k8s_busybox.19973479_busybox_default_9f126f56-f18c-11e6-9e78-7aebc4e21f54_3a83e561
[root@rancher-node3 ~]# docker exec -ti 1072 /bin/sh
/ # df -h
Filesystem Size Used Available Use% Mounted on
/dev/mapper/docker-253:1-310378690-7ffa15d771fc235224960bf5a02a773f930f8196ef99d35bf7a9a07a36859ca9
10.0G 33.9M 10.0G 0% /
tmpfs 3.8G 0 3.8G 0% /dev
tmpfs 3.8G 0 3.8G 0% /sys/fs/cgroup
/dev/vda1 80.0G 12.0G 67.9G 15% /dev/termination-log
/dev/vda1 80.0G 12.0G 67.9G 15% /etc/resolv.conf
/dev/vda1 80.0G 12.0G 67.9G 15% /etc/hostname
/dev/vda1 80.0G 12.0G 67.9G 15% /etc/hosts
shm 64.0M 0 64.0M 0% /dev/shm
192.168.101.164:vol_930e466feced37f287d9f543f4eab597
5.0G 32.6M 5.0G 1% /usr/share/busybox
tmpfs 3.8G 12.0K 3.8G 0% /var/run/secrets/kubernetes.io/serviceaccount
tmpfs 3.8G 0 3.8G 0% /proc/kcore
tmpfs 3.8G 0 3.8G 0% /proc/timer_list
tmpfs 3.8G 0 3.8G 0% /proc/timer_stats
tmpfs 3.8G 0 3.8G 0% /proc/sched_debug
参考
GlusterFS集群文件系统研究：http://blog.sae.sina.com.cn/archives/4004
GlusterFS系统中文管理手册：http://www.blogchong.com/?mod=pad&act=view&id=18
https://github.com/gluster/gluster-kubernetes/blob/master/docs/setup-guide.md
https://access.redhat.com/documentation/en/red-hat-gluster-storage/3.1/single/deployment-guide-for-containerized-red-hat-gluster-storage-in-openshift-enterprise/
Running a Replicated Stateful Application：https://kubernetes.io/docs/tutorials/stateful-application/run-replicated-stateful-application/
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