GlusteFS 二

通过heketi提供的RestfullApi来管理 Gluster,进而与kubernetes集成。将gluster作为kubernetes的数据存储

１　安装　
　安装gluster 参见　GlusterFS 一　
　安装heketi
　 yum -y install heketi heketi-client

2 配置秘钥对

　生成秘钥
ssh-keygen -f /etc/heketi/heketi_key -t rsa -N ''
chown heketi:heketi /etc/heketi/heketi_key*

发布公钥
　　ssh-copy-id -i /etc/heketi/heketi_key.pub root@10.2.0.11
ssh-copy-id -i /etc/heketi/heketi_key.pub root@10.2.0.12
ssh-copy-id -i /etc/heketi/heketi_key.pub root@10.2.0.13

3 创建数据存储文件夹　boltdb 由go语言实现的key,value数据库，支持acid, （注意　boltdb 存储的数据可以拷贝到其他节点从而规避heketi的单点问题）

mkdir /dcos/heketi
chown -R heketi:heketi /dcos/heketi

４　配置

cat /etc/heketi/heketi.json

{
  "_port_comment": "Heketi Server Port Number",
  "port": "8080",

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

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

  "_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": "/etc/heketi/heketi_key",
      "user": "root",
      "port": "22",
      "fstab": "/etc/fstab"
    },

    "_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"
    },

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

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

5 启动并验证
systemctl enable heketi
systemctl restart heketi

curl http://localhost:8088/hello

6 集群化
配置拓扑

cat /etc/heketi/topology.json 

{
  "clusters": [
    {
      "nodes": [
        {
          "node": {
            "hostnames": {
              "manage": [
                "node1"
              ],
              "storage": [
                "10.2.0.11"
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "node2"
              ],
              "storage": [
                "10.2.0.12"
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"
          ]
        },
        {
          "node": {
            "hostnames": {
              "manage": [
                "node3"
              ],
              "storage": [
                "10.2.0.13"
              ]
            },
            "zone": 1
          },
          "devices": [
            "/dev/sdb"
          ]
        }
      ]
    }
  ]
}

创建集群
heketi-cli --server http://10.2.0.11:8080 topology load --json=/etc/heketi/topology.json

查看
heketi-cli --server http://10.2.0.11:8080　cluster list
heketi-cli --server http://10.2.0.11:8080 cluster info id****
heketi-cli --server http://10.2.0.11:8080 volume list
heketi-cli --server http://10.2.0.11:8080 volume info id****

7 kubernetes 集群存储应用

cat storeclass.yaml 

apiVersion: storage.k8s.io/v1beta1
kind: StorageClass
metadata:
  name: slow
provisioner: kubernetes.io/glusterfs
parameters:
  resturl: "http://10.2.0.11:8080"
  volumetype: "replicate:3"


# jenkins
cat jenkins.yml
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: jenkins
  labels:
    name: jenkins
spec:
  serviceName: jenkins
  replicas: 1
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      name: jenkins
      labels:
        name: jenkins
    spec:
      terminationGracePeriodSeconds: 10
      serviceAccountName: jenkins
      containers:
        - name: jenkins
          image: jenkins/jenkins:latest          imagePullPolicy: Always
          ports:
            - containerPort: 8080
            - containerPort: 50000
          resources:
            limits:
              cpu: 1
              memory: 1Gi
            requests:
              cpu: 0.5
              memory: 500Mi
          env:
            - name: LIMITS_MEMORY
              valueFrom:
                resourceFieldRef:
                  resource: limits.memory
                  divisor: 1Mi
            - name: JAVA_OPTS
              value: "-Duser.timezone=Asia/Shanghai  -Xms528m -Xmx528m "
          volumeMounts:
            - name: jenkins-home
              mountPath: /var/jenkins_home
      securityContext:
        fsGroup: 1000
  volumeClaimTemplates:
  - metadata:
      name: jenkins-home
      annotations:
        volume.beta.kubernetes.io/storage-class: slow
    spec:
      accessModes: [ "ReadWriteMany" ]
      resources:
        requests:
          storage: 50Gi
---
apiVersion: v1
kind: Service
metadata:
  name: jenkins-svc
  namespace: default
spec:
  ports:
  - port: 8080
    targetPort: 8080
    name: web
  - port: 50000
    targetPort: 50000
    name: slave
  selector:
    name: jenkins
  type: NodePort

cat service-account.yml 
# In GKE need to get RBAC permissions first with
# kubectl create clusterrolebinding cluster-admin-binding --clusterrole=cluster-admin [--user=<user-name>|--group=<group-name>]

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: jenkins

---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: jenkins
rules:
- apiGroups: [""]
  resources: ["pods"]
  verbs: ["create","delete","get","list","patch","update","watch"]
- apiGroups: [""]
  resources: ["pods/exec"]
  verbs: ["create","delete","get","list","patch","update","watch"]
- apiGroups: [""]
  resources: ["pods/log"]
  verbs: ["get","list","watch"]
- apiGroups: [""]
  resources: ["secrets"]
  verbs: ["get"]

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
  name: jenkins
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: jenkins
subjects:
- kind: ServiceAccount
  name: jenkins