k8s使用Glusterfs动态生成pv

一、环境介绍

[root@k8s-m ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

172.31.250.152 k8s-m
172.31.250.153 node1
172.31.250.154 node2

[root@k8s-m ~]# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-m Ready master 41m v1.13.1
node1 Ready <none> 27m v1.13.1
node2 Ready <none> 28m v1.13.1

#删除k8s集群master的污点（我这边就三台服务器，需要使用master，生产环境千万别这么干）
[root@k8s-m ~]# kubectl taint node k8s-m node-role.kubernetes.io/master-
node/k8s-m untainted

所有存储服务器下载

yum install centos-release-gluster -y

yum install glusterfs-server -y

二、Heketi安装

所有版本：https://github.com/heketi/heketi/releases

#下载安装
wget https://github.com/heketi/heketi/releases/download/v8.0.0/heketi-v8.0.0.linux.amd64.tar.gz
tar xf heketi-v8.0.0.linux.amd64.tar.gz
mkdir  -p /data/heketi/{bin,conf,data}
cp heketi/heketi.json /data/heketi/conf/
cp heketi/{heketi,heketi-cli} /data/heketi/bin/

#我们glusterFS部署在k8s集群外，所以heketi通过ssh管理glusterFS。需要创建免秘钥登陆到所有glusterFS节点。
ssh-keygen -f /data/heketi/conf/heketi_key -t rsa -N ''
#将公钥放到所有GlusterFS节点
ssh-copy-id  -i /data/heketi/conf/heketi_key.pub  root@k8s-m
ssh-copy-id  -i /data/heketi/conf/heketi_key.pub  root@node1
ssh-copy-id  -i /data/heketi/conf/heketi_key.pub  root@node2

2、heketi.json配置文件

[root@k8s-m ~]# cat /data/heketi/conf/heketi.json
{
  "_port_comment": "Heketi Server Port Number",
  "port": "18080",

	"_enable_tls_comment": "Enable TLS in Heketi Server",
	"enable_tls": false,

	"_cert_file_comment": "Path to a valid certificate file",
	"cert_file": "",

	"_key_file_comment": "Path to a valid private key file",
	"key_file": "",

  "_use_auth": "Enable JWT authorization. Please enable for deployment",
  "use_auth": true,

  "_jwt": "Private keys for access",
  "jwt": {
    "_admin": "Admin has access to all APIs",
    "admin": {
      "key": "adminkey"
    },
    "_user": "User only has access to /volumes endpoint",
    "user": {
      "key": "userkey"
    }
  },

  "_backup_db_to_kube_secret": "Backup the heketi database to a Kubernetes secret when running in Kubernetes. Default is off.",
  "backup_db_to_kube_secret": false,

  "_glusterfs_comment": "GlusterFS Configuration",
  "glusterfs": {
    "_executor_comment": [
      "Execute plugin. Possible choices: mock, ssh",
      "mock: This setting is used for testing and development.",
      "      It will not send commands to any node.",
      "ssh:  This setting will notify Heketi to ssh to the nodes.",
      "      It will need the values in sshexec to be configured.",
      "kubernetes: Communicate with GlusterFS containers over",
      "            Kubernetes exec api."
    ],
    "executor": "ssh",

    "_sshexec_comment": "SSH username and private key file information",
    "sshexec": {
      "keyfile": "/data/heketi/conf/heketi_key",
      "user": "root",
      "port": "22",
      "fstab": "/etc/fstab",
      "backup_lvm_metadata": false
    },

    "_kubeexec_comment": "Kubernetes configuration",
    "kubeexec": {
      "host" :"https://kubernetes.host:8443",
      "cert" : "/path/to/crt.file",
      "insecure": false,
      "user": "kubernetes username",
      "password": "password for kubernetes user",
      "namespace": "OpenShift project or Kubernetes namespace",
      "fstab": "Optional: Specify fstab file on node.  Default is /etc/fstab",
      "backup_lvm_metadata": false
    },

    "_db_comment": "Database file name",
    "db": "/data/heketi/data/heketi.db",

     "_refresh_time_monitor_gluster_nodes": "Refresh time in seconds to monitor Gluster nodes",
    "refresh_time_monitor_gluster_nodes": 120,

    "_start_time_monitor_gluster_nodes": "Start time in seconds to monitor Gluster nodes when the heketi comes up",
    "start_time_monitor_gluster_nodes": 10,

    "_loglevel_comment": [
      "Set log level. Choices are:",
      "  none, critical, error, warning, info, debug",
      "Default is warning"
    ],
    "loglevel" : "debug",

    "_auto_create_block_hosting_volume": "Creates Block Hosting volumes automatically if not found or exsisting volume exhausted",
    "auto_create_block_hosting_volume": true,

    "_block_hosting_volume_size": "New block hosting volume will be created in size mentioned, This is considered only if auto-create is enabled.",
    "block_hosting_volume_size": 500,

    "_block_hosting_volume_options": "New block hosting volume will be created with the following set of options. Removing the group gluster-block option is NOT recommended. Additional options can be added next to it separated by a comma.",
    "block_hosting_volume_options": "group gluster-block"
  }
}

　　

3、创建heketi启动脚本

[root@k8s-m ~]# cat /usr/lib/systemd/system/heketi.service
[Unit]
Description=RESTful based volume management framework for GlusterFS
Before=network-online.target
After=network-online.target
Documentation=https://github.com/heketi/heketi
[Service]
Type=simple
LimitNOFILE=
ExecStart=/data/heketi/bin/heketi --config=/data/heketi/conf/heketi.json
KillMode=process
Restart=on-failure
RestartSec=
SuccessExitStatus=
StandardOutput=syslog
StandardError=syslog
[Install]
WantedBy=multi-user.target

#启动heketi
systemctl start heketi
systemctl enable heketi
systemctl status heketi

4、Heketi添加cluster

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --user admin --server http://k8s-m:18080 --secret adminkey --json  cluster create
{"id":"aa378f94299c29bbd0224fc902c0cbd8","nodes":[],"volumes":[],"block":true,"file":true,"blockvolumes":[]}

5、#将3个glusterfs节点作为node添加到cluster

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"   node add --cluster "aa378f94299c29bbd0224fc902c0cbd8"  --management-host-name  k8s-m --storage-host-name 172.31.250.152 --zone 1
Node information:
Id: 9280cde1c2640bf3fef483509a04bff2
State: online
Cluster Id: aa378f94299c29bbd0224fc902c0cbd8
Zone:
Management Hostname k8s-m
Storage Hostname 172.31.250.152

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"   node add --cluster "aa378f94299c29bbd0224fc902c0cbd8"  --management-host-name  node1 --storage-host-name 172.31.250.153 --zone 1
Node information:
Id: 19838aea8104aee077b0ea67cd6ea012
State: online
Cluster Id: aa378f94299c29bbd0224fc902c0cbd8
Zone:
Management Hostname node1
Storage Hostname 172.31.250.153

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"   node add --cluster "aa378f94299c29bbd0224fc902c0cbd8"  --management-host-name  node2 --storage-host-name 172.31.250.154 --zone 1
Node information:
Id: 171aeb876968bf9ef1fab28e6a31e919
State: online
Cluster Id: aa378f94299c29bbd0224fc902c0cbd8
Zone:
Management Hostname node2
Storage Hostname 172.31.250.154

6、添加device

#机器只是作为gluster的运行单元，volume是基于device创建的。同时需要特别说明的是，目前heketi仅支持使用裸分区或裸磁盘(未格式化)添加为device，不支持文件系统

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"    --json device add --name="/dev/vdb" --node "9280cde1c2640bf3fef483509a04bff2"
Device added successfully

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"    --json device add --name="/dev/vdb" --node "19838aea8104aee077b0ea67cd6ea012"
Device added successfully

[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"    --json device add --name="/dev/vdb" --node "171aeb876968bf9ef1fab28e6a31e919"
Device added successfully

##查看
[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"   node list
Id:171aeb876968bf9ef1fab28e6a31e919    Cluster:aa378f94299c29bbd0224fc902c0cbd8
Id:19838aea8104aee077b0ea67cd6ea012    Cluster:aa378f94299c29bbd0224fc902c0cbd8
Id:9280cde1c2640bf3fef483509a04bff2    Cluster:aa378f94299c29bbd0224fc902c0cbd8

7、添加volume

创建一个大小为3G，副本为3的volume
[root@k8s-m ~]# /data/heketi/bin/heketi-cli --server http://k8s-m:18080   --user "admin" --secret "adminkey"  volume create --size 3 --replica 3
Name: vol_2aab01a26b3a2dfc1286eed16c8fcb62
Size: 3
Volume Id: 2aab01a26b3a2dfc1286eed16c8fcb62
Cluster Id: aa378f94299c29bbd0224fc902c0cbd8
Mount: 172.31.250.154:vol_2aab01a26b3a2dfc1286eed16c8fcb62
Mount Options: backup-volfile-servers=172.31.250.153,172.31.250.152
Block: false
Free Size: 0
Reserved Size: 0
Block Hosting Restriction: (none)
Block Volumes: []
Durability Type: replicate
Distributed+Replica: 3

　　

8、创建storageclass

[root@k8s-m ~]# cat   storageclass-glusterfs.yaml
apiVersion: v1
kind: Secret
metadata:
  name: heketi-secret
  namespace: default
data:
  # base64 encoded password. E.g.: echo -n "mypassword" | base64
  key: YWRtaW5rZXk=
type: kubernetes.io/glusterfs

---
apiVersion: storage.k8s.io/v1beta1
kind: StorageClass
metadata:
  name: glusterfs
provisioner: kubernetes.io/glusterfs
allowVolumeExpansion: true
parameters:
  resturl: "http://172.31.250.152:18080"
  clusterid: "aa378f94299c29bbd0224fc902c0cbd8"
  restauthenabled: "true"
  restuser: "admin"
  #secretNamespace: "default"
  #secretName: "heketi-secret"
  restuserkey: "adminkey"
  gidMin: ""
  gidMax: ""
  volumetype: "replicate:3"

#导入
[root@k8s-m ~]# kubectl apply -f    storageclass-glusterfs.yaml
secret/heketi-secret created
storageclass.storage.k8s.io/glusterfs created

9、创建一个 statefulset测试是否会自动生成pv

#查看pv和pvc
[root@k8s-m ~]# kubectl get pv --all-namespaces
No resources found.
[root@k8s-m ~]# kubectl get pvc --all-namespaces
No resources found.

#statefulset文件
[root@k8s-m ~]# cat   mystatefulset.yaml
apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port:
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx # has to match .spec.template.metadata.labels
  serviceName: "nginx"
  replicas:  # by default is
  template:
    metadata:
      labels:
        app: nginx # has to match .spec.selector.matchLabels
    spec:
      terminationGracePeriodSeconds:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort:
          name: web
        volumeMounts:
        - name: www
          mountPath: /usr/share/nginx/html
  volumeClaimTemplates:
  - metadata:
      name: www
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: "glusterfs"
      resources:
        requests:
          storage: 2Gi

#查看pv和pvc(根据pvc自动创建了pv)
[root@k8s-m ~]# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                 STORAGECLASS   REASON   AGE
pvc-0afdc43a--11e9-b8f6-00163e024454   2Gi        RWO            Delete           Bound    default/www-nginx-   glusterfs               6s
[root@k8s-m ~]# kubectl get pvc
NAME          STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
www-nginx-   Bound    pvc-0afdc43a--11e9-b8f6-00163e024454   2Gi        RWO            glusterfs      16s