Kubernetes存储之GlusterFS
环境
操作系统 ： CenOS-7.9 amd64
平台：Kubernetes-1.20.15
GlusterFS版本：6.10
- 192.168.90.9
- 192.168.90.10
- 192.168.90.11
GlusterFS 部署
配置FQDN
<略>
分区挂载
<略>
glusterFS安装
yum -y install centos-release-gluster6
yum -y install glusterfs glusterfs-fuse glusterfs-server
开启glusterfs服务
systemctl enable glusterd.service --now
配置步骤
添加集群信任池
# gluster peer probe node-02
# gluster peer probe node-03
查看集群信息
# gluster peer status
# gluster pool list
创建集群数据卷
gluster volume status all
gluster volume create gfs-data replica 3 node-01:/data/brick1 \
node-02:/data/brick1 \
node-03:/data/brick1 force
gluster volume list
启动集群数据卷
# gluster volume start gfs-data
# gluster volume info
Volume Name: gfs-data
Type: Replicate
Volume ID: 617624d3-5a87-4022-b92e-3b43d99d1077
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 3 = 3
Transport-type: tcp
Bricks:
Brick1: node-01:/data/brick1
Brick2: node-02:/data/brick1
Brick3: node-03:/data/brick1
Options Reconfigured:
transport.address-family: inet
nfs.disable: on
performance.client-io-threads: off
查看卷信息
# gluster volume status gfs-data
Status of volume: gfs-data
Gluster process TCP Port RDMA Port Online Pid
------------------------------------------------------------------------------
Brick node-01:/data/brick1 49152 0 Y 39317
Brick node-02:/data/brick1 49152 0 Y 39129
Brick node-03:/data/brick1 49152 0 Y 38991
Self-heal Daemon on localhost N/A N/A Y 39338
Self-heal Daemon on node-02 N/A N/A Y 39150
Self-heal Daemon on node-03 N/A N/A Y 39012
Task Status of Volume gfs-data
------------------------------------------------------------------------------
There are no active volume tasks
# gluster volume info gfs-data
安全
# 配置权限
gluster volume set gfs-data storage.owner-uid 1000
gluster volume set gfs-data storage.owner-gid 1000
# gluster volume set gfs auth.allow 10.0.0.2,10.0.0.3,10.0.0.4
# gluster volume set gfs auth.allow *
客户端挂载
yum -y install centos-release-gluster6
yum --enablerepo=centos-gluster6 install glusterfs glusterfs-fuse
挂载选项
# mount -t glusterfs -o backupvolfile-server=node02,use-readdirp=no,noatime,log-level=WARNING,_netdev node01:/storage_volumes /data
# mount -t glusterfs -o backup-volfile-servers=node-02:node-03,log-level=WARNING node-01:/gfs-data /mnt/
# mount -t glusterfs -obackup-volfile-servers=192.168.90.10:192.168.90.11,log-level=WARNING 192.168.90.9:/gfs-data /mnt
mount: unknown filesystem type 'glusterfs'
K8S后端
# https://github.com/kubernetes/examples/blob/master/volumes/glusterfs/glusterfs-endpoints.yaml
apiVersion: v1
kind: Endpoints
metadata:
name: glusterfs-cluster
subsets:
- addresses:
- ip: 192.168.90.9
ports:
- port: 49152
- addresses:
- ip: 192.168.90.10
ports:
- port: 49152
- addresses:
- ip: 192.168.90.11
ports:
- port: 49152
---
apiVersion: v1
kind: Service
metadata:
name: glusterfs-cluster
spec:
ports:
- port: 49152
测试Pod 直接关联
apiVersion: v1
kind: Pod
metadata:
name: glusterfs
spec:
containers:
- name: glusterfs
image: nginx
volumeMounts:
- mountPath: "/mnt/glusterfs"
name: glusterfsvol
volumes:
- name: glusterfsvol
glusterfs:
endpoints: glusterfs-cluster
endpointsNamespace: gfs
path: gfs-data
readOnly: false
创建PVC
apiVersion: v1
kind: PersistentVolume
metadata:
name: gitea-shared-storage
annotations:
pv.beta.kubernetes.io/gid: "1000"
spec:
capacity:
storage: 50Gi
volumeMode: Filesystem
accessModes:
- ReadWriteMany
persistentVolumeReclaimPolicy: Retain
storageClassName: ""
glusterfs:
endpoints: glusterfs-cluster
endpointsNamespace: gfs
path: /gfs-data/gitea
readOnly: false
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: gitea-shared-storage
spec:
accessModes:
- ReadWriteMany
volumeMode: Filesystem
volumeName: gitea-shared-storage
resources:
requests:
storage: 50Gi
storageClassName: ""
注意：该特性已经在1.25版本后废弃，参考：https://docs.openshift.com/container-platform/3.11/install_config/storage_examples/gluster_example.html
glusterfs 性能调优
开启 指定 volume 的配额
gluster volume quota gfs-data enable
限制 models 中 / (既总目录) 最大使用 80GB 空间
gluster volume quota gfs-data limit-usage / 80GB
设置 cache 4GB
gluster volume set gfs-data performance.cache-size 4GB
需要确保客户端的物理内存有4GB容量，否则挂载失败
开启 异步 ， 后台操作
gluster volume set gfs-data performance.flush-behind on
设置 io 线程 32
gluster volume set gfs-data performance.io-thread-count 32
设置回写 (写数据时间，先写入缓存内，再写入硬盘)
gluster volume set gfs-data performance.write-behind on
其它
# 设置 io 线程, 太大会导致进程崩溃
$ gluster volume set gfs-data performance.io-thread-count 16
# 设置 网络检测时间, 默认42s
$ gluster volume set gfs-data network.ping-timeout 10
# 设置 写缓冲区的大小, 默认1M
$ gluster volume set gfs-data performance.write-behind-window-size 1024MB
引用参考
小结
本方案适用于Kubernetes版本低于1.25版本的数据声明，并且采用endpoint + service的方式实现数据高可用。然而采用了复制卷，在性能方面会差强人意，可结合底层ZFS文件系统来规避，或者采用分散式卷来中和。
