k8s1.5.4挂载volume之glusterfs

Posted 2020-09-05

k8s1.5.4挂载volume之glusterfs

volume的例子集合

https://github.com/kubernetes/kubernetes/tree/master/examples/volumes

http://www.dockerinfo.net/2926.html

http://dockone.io/article/2087

https://www.kubernetes.org.cn/1146.html

https://kubernetes.io/docs/user-guide/volumes/

k8s集群安装部署

http://jerrymin.blog.51cto.com/3002256/1898243

k8s集群RC、SVC、POD部署

http://jerrymin.blog.51cto.com/3002256/1900260 

k8s集群组件kubernetes-dashboard和kube-dns部署

http://jerrymin.blog.51cto.com/3002256/1900508

k8s集群监控组件heapster部署

http://jerrymin.blog.51cto.com/3002256/1904460

k8s集群反向代理负载均衡组件部署

http://jerrymin.blog.51cto.com/3002256/1904463 

k8s集群挂载volume之nfs

http://jerrymin.blog.51cto.com/3002256/1906778

glusterfs参考文档

https://github.com/kubernetes/kubernetes/tree/master/examples/volumes/glusterfs

http://gluster.readthedocs.io/en/latest/Administrator%20Guide/

http://blog.gluster.org/2016/03/persistent-volume-and-claim-in-openshift-and-kubernetes-using-glusterfs-volume-plugin/

https://docs.openshift.org/latest/install_config/persistent_storage/persistent_storage_glusterfs.html

The example assumes that you have already set up a Glusterfs server cluster and the Glusterfs client package is installed on all Kubernetes nodes.

需要先在node节点安装部署gluster集群环境，可以参考http://www.linuxidc.com/Linux/2017-02/140517.htm

1，glusterfs服务端和客户端环境部署：

CentOS 安装 glusterfs 非常的简单

在三个节点都安装glusterfs

yum install centos-release-gluster

yum install -y glusterfs glusterfs-server glusterfs-fuse glusterfs-rdma

配置 GlusterFS 集群：

启动 glusterFS 

systemctl start glusterd.service

systemctl enable glusterd.service

配置

[[email protected] glusterfs]# cd /usr/local/kubernetes/examples/volumes/glusterfs

[[email protected] glusterfs]# ls

glusterfs-endpoints.json  glusterfs-pod.json  glusterfs-service.json  README.md

[[email protected] glusterfs]# gluster peer probe k8s-master

peer probe: success. Probe on localhost not needed

[[email protected] glusterfs]# gluster peer probe k8s-node1

peer probe: success. 

[[email protected] glusterfs]# gluster peer probe k8s-node2

peer probe: success. 

查看集群状态

[[email protected] glusterfs]# gluster peer status

Number of Peers: 2

Hostname: k8s-node1

Uuid: 4853baab-e8fb-41ad-9a93-bfb5f0d55692

State: Peer in Cluster (Connected)

Hostname: k8s-node2

Uuid: 2c9dea85-2305-4989-a74a-970f7eb08093

State: Peer in Cluster (Connected)

创建数据存储目录

[[email protected] glusterfs]# mkdir -p /data/gluster/data

[[email protected] ~]# mkdir -p /data/gluster/data

[[email protected] ~]# mkdir -p /data/gluster/data

创建volume使用默认DHT也叫分布卷: 将文件已hash算法随机分布到 一台服务器节点中存储。

[[email protected] glusterfs]# gluster volume create glusterfsdata replica 3 k8s-master:/data/gluster/data k8s-node1:/data/gluster/data k8s-node2:/data/gluster/data force

volume create: glusterfsdata: success: please start the volume to access data

查看volume信息

[[email protected] glusterfs]# gluster volume info

 

Volume Name: glusterfsdata

Type: Replicate

Volume ID: 100d1f33-fb0d-48c3-9a93-d08c2e2dabb3

Status: Created

Snapshot Count: 0

Number of Bricks: 1 x 3 = 3

Transport-type: tcp

Bricks:

Brick1: k8s-master:/data/gluster/data

Brick2: k8s-node1:/data/gluster/data

Brick3: k8s-node2:/data/gluster/data

Options Reconfigured:

transport.address-family: inet

nfs.disable: on

启动volume

[[email protected] glusterfs]# gluster volume  start glusterfsdata

volume start: glusterfsdata: success

测试客户端

[[email protected] glusterfs]# mount -t glusterfs k8s-master:glusterfsdata /mnt

[[email protected] glusterfs]# df -h|grep gluster

k8s-master:glusterfsdata  422G  934M  421G   1% /mnt

[[email protected] mnt]# echo glusterfs > glusterfs

[[email protected] mnt]# cat glusterfs 

glusterfs

2，k8s集群挂载glusterfs

注意endpoint改成glusterfs服务集群的一个节点的IP，配置文件是2个IP所以填2个节点IP

[[email protected] glusterfs]# vim glusterfs-endpoints.json 

[[email protected] glusterfs]# kubectl create -f glusterfs-endpoints.json 

endpoints "glusterfs-cluster" created

[[email protected] glusterfs]# kubectl get ep |grep glusterfs

glusterfs-cluster   172.17.3.7:1,172.17.3.8:1                1m

[[email protected] glusterfs]# kubectl create -f glusterfs-service.json 

service "glusterfs-cluster" created

注意volumeMounts挂载name改成上面新建的glusterfs volume 

        "volumes": [

            {

                "name": "glusterfsvol",

                "glusterfs": {

                    "endpoints": "glusterfs-cluster",

                    "path": "glusterfsdata",

                    "readOnly": true

                }

            }

        ]

[[email protected] glusterfs]# kubectl create -f glusterfs-pod.json 

pod "glusterfs" created

[[email protected] glusterfs]# kubectl get pod -o wide |grep glus

glusterfs            1/1       Running   0          4m        10.1.39.8    k8s-node1

[[email protected] ~]# mount | grep gluster

172.17.3.7:glusterfsdata on /var/lib/kubelet/pods/61cd4cec-0955-11e7-a8c3-c81f66d97bc3/volumes/kubernetes.io~glusterfs/glusterfsvol type fuse.glusterfs (ro,relatime,user_id=0,group_id=0,default_permissions,allow_other,max_read=131072)

可见github上面例子不太直观，版本比较老，但是过程比较清楚。这里也可以参考nfs挂载把glusterfs挂载到nginx站点，那样测试更直观。下面是升级测试

创建PV/PVC

[[email protected] glusterfs]# cat glusterfs-pv.yaml 

apiVersion: v1

kind: PersistentVolume

metadata:

  name: gluster-default-volume

spec:

  capacity:

    storage: 8Gi

  accessModes:

    - ReadWriteMany

  glusterfs:

    endpoints: "glusterfs-cluster"

    path: "glusterfsdata"

    readOnly: false

[[email protected] glusterfs]# cat glusterfs-pvc.yaml 

kind: PersistentVolumeClaim

apiVersion: v1

metadata:

  name: glusterfs-claim

spec:

  accessModes:

    - ReadWriteMany

  resources:

    requests:

      storage: 8Gi

[[email protected] glusterfs]# kubectl create -f glusterfs-pv.yaml 

persistentvolume "gluster-default-volume" created

[[email protected] glusterfs]# kubectl create -f glusterfs-pvc.yaml 

persistentvolumeclaim "glusterfs-claim" created

[[email protected] glusterfs]# kubectl get pvc

NAME              STATUS    VOLUME                   CAPACITY   ACCESSMODES   AGE

glusterfs-claim   Bound     gluster-default-volume   8Gi        RWX           2m

创建nginx站点挂载glusterfs-claim

[[email protected] glusterfs]# kubectl create -f glusterfs-web-rc.yaml 

replicationcontroller "glusterfs-web" created

[[email protected] glusterfs]# kubectl create -f glusterfs-web-service.yaml 

service "glusterfs-web" created

配置文件如下

[[email protected] glusterfs]# cat glusterfs-web-rc.yaml 

# This pod mounts the nfs volume claim into /usr/share/nginx/html and

# serves a simple web page.

apiVersion: v1

kind: ReplicationController

metadata:

  name: glusterfs-web

spec:

  replicas: 2

  selector:

    role: glusterfs-web-frontend

  template:

    metadata:

      labels:

        role: glusterfs-web-frontend

    spec:

      containers:

      - name: glusterfsweb

        image: nginx

        imagePullPolicy: IfNotPresent

        ports:

          - name: glusterfsweb

            containerPort: 80

        volumeMounts:

            # name must match the volume name below

            - name: gluster-default-volume

              mountPath: "/usr/share/nginx/html"

      volumes:

      - name: gluster-default-volume

        persistentVolumeClaim:

          claimName: glusterfs-claim

[[email protected] glusterfs]# cat glusterfs-web-service.yaml 

kind: Service

apiVersion: v1

metadata:

  name: glusterfs-web

spec:

  ports:

    - port: 80

  selector:

    role: glusterfs-web-frontend

验证

[[email protected] glusterfs]# kubectl get pods -o wide |grep glusterfs-web 

glusterfs-web-280mz   1/1       Running   0          1m        10.1.39.12   k8s-node1

glusterfs-web-f952d   1/1       Running   0          1m        10.1.15.10   k8s-node2

[[email protected] glusterfs]# kubectl exec -ti glusterfs-web-280mz -- bash

[email protected]:/# df -h |grep glusterfs

172.17.3.7:glusterfsdata                                                                            422G  954M  421G   1% /usr/share/nginx/html

[email protected]:/# cd /usr/share/nginx/html/

[email protected]:/usr/share/nginx/html# ls

glusterfs

[email protected]:/usr/share/nginx/html# cat glusterfs 

glusterfs

本文出自 “jerrymin” 博客，请务必保留此出处http://jerrymin.blog.51cto.com/3002256/1907274