Kubernetes 部署 MongoDB 集群

一、k8s 部署 MongoDB

1.1 前提准备
  • MongoDB 镜像 172.18.231.30:5000/si-tech/mongo:latest 。(可从 Docker Hub 官网 下载镜像)
  • 主机新建 /home/csd/mongodb/db 目录。(使用 HostPath 数据卷挂载到容器中,作为 MongoDB 的文件存储目录。您也可以使用其他类型的数据卷)
1.2 编写 yaml 文件

编写 mongo.yaml 文件,提供了一个对外暴露的 NodePort 类型的 Service,用于外部访问。

apiVersion: v1
kind: Service
metadata:
  name: mongo
  labels:
    app: mongo
spec:
  ports:
  - name: mongo
    port: 27017
    targetPort: 27017
  clusterIP: None
  selector:
    app: mongo
---
apiVersion: v1
kind: Service
metadata: 
  name: mongo-service
  labels: 
    app: mongo
spec: 
  ports: 
  - name: mongo-http
    port: 27017
  selector: 
    app: mongo
  type: NodePort
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata: 
  name: mongo
spec: 
  selector: 
    matchLabels: 
      app: mongo
  serviceName: "mongo"
  replicas: 2
  podManagementPolicy: Parallel
  template: 
    metadata: 
      labels: 
        app: mongo
    spec: 
      terminationGracePeriodSeconds: 10
      affinity: 
         podAntiAffinity: 
           requiredDuringSchedulingIgnoredDuringExecution: 
           - labelSelector: 
               matchExpressions: 
               - key: "app"
                 operator: In
                 values: 
                 - mongo
             topologyKey: "kubernetes.io/hostname"
      containers: 
      - name: mongo
        image: 172.18.231.30:5000/si-tech/mongo:latest
        command:  
        - mongod 
        - "--bind_ip_all"
        - "--replSet"
        - rs0
        ports: 
        - containerPort: 27017
        volumeMounts: 
        - name: mongo-data
          mountPath: /data/db
      volumes:
      - name: mongo-data
        hostPath:
          path: /home/csd/mongodb/db
1.3 部署启动 MongoDB

启动命令 kubectl create -f mongo.yaml

kubectl create -f mongo.yaml --kubeconfig=/home/csd/csd.kubeconfig

执行 mongo.yaml 文件成功,如下所示:


查看 Service、StatefulSet、Pod 信息,正常启动,如下:

kubectl get service
kubectl get statefulset
kubectl get pod
Kubernetes 部署 MongoDB 集群_第1张图片
1.4 测试连接 MongoDB

提供了对外暴露的服务 mongo-service,可通过 主机:NodePort的端口 的方式访问。

Kubernetes 部署 MongoDB 集群_第2张图片

使用 curl http://172.18.232.207:30741 测试连接 MongoDB
其中 172.18.232.207 为 k8s 集群的主机(任一主机),30741mongo-service 服务的 NodePort 端口。如下图所示:


提示信息 It looks like you are trying to access MongoDB over HTTP on the native driver port. ,nice,部署 MongoDB 成功!

------------------------------我是华丽的分割线----------------------------
hostpath会把宿主机上的指定卷加载到容器之中,但如果 Pod 发生跨主机的重建,数据会丢失,无法保证数据持久化。如果需要做数据持久化,建议使用PV、PVC。下面是kafka数据持久化的一个示例:

apiVersion: v1
kind: Service
metadata:
  name: kafka-service
  namespace: crm-mci
spec:
  type: NodePort
  ports:
  - port: 9092
    targetPort: 9092
    nodePort: 32129
    name: kafkaport
  selector:
    app: kafka-server
---
apiVersion: apps/v1beta1
kind: StatefulSet   
metadata:
  name: kafka-stateful
  namespace: crm-mci
spec:
  replicas: 1
  serviceName: kafka-service
  selector:
    matchLabels:
        app: kafka-server
  template:
    metadata:
      labels:
        app: kafka-server
        version: v1
    spec:
      containers:
        - name: k8skafka
          image: 172.18.231.30:5000/si-tech/crm-mci/kafka:2.0.0
          imagePullPolicy: Always
          resources:
             requests:
               memory: "2Gi"
               cpu: "500m"
          env:
           - name: POD_IP
             valueFrom:
               fieldRef:
                 fieldPath: status.podIP
           - name: NODE_IP
             valueFrom:
               fieldRef:
                 fieldPath: status.hostIP
           - name: NODE_PORT
             value: "32129"
           - name: ZK_ADDRESS
             value: "172.18.238.26:35618"
          ports:
          - containerPort: 9092
          command:
          - /bin/sh
          - -c
          - "/kafka/bin/kafkaGenConfig.sh && /kafka/bin/kafka-server-start.sh /kafka/config/server.properties"
          volumeMounts:
          - name: datadir
            mountPath: /kafka/data
          - name: logdir
            mountPath: /kafka/logs
          livenessProbe:
            tcpSocket:
              port: 9092
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
          readinessProbe:
            tcpSocket:
              port: 9092
            initialDelaySeconds: 30
            periodSeconds: 10
            timeoutSeconds: 5
  volumeClaimTemplates:
  - metadata:
      name: datadir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: nfs-storage
      resources:
        requests:
          storage: 975Mi
  - metadata:
      name: logdir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      storageClassName: nfs-storage
      resources:
        requests:
          storage: 975Mi

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