本文使用 Nacos 1.2.1 + MySQL 5.7

本文所使用的配置文件，在GiHub项目中 https://github.com/aidansu/spring-cloud-alibaba-components-install

本文部署的是开发环境，用于开发测试，并不是高可用的生产环境！

Nacos 致力于帮助您发现、配置和管理微服务。Nacos 提供了一组简单易用的特性集，帮助您快速实现动态服务发现、服务配置、服务元数据及流量管理。官网有提供不同环境、不同方式的部署方案，有需要的同学可以查看官网教程。官网地址：https://nacos.io/

使用 Spring Cloud Alibaba 微服务框架开发项目，必须要使用到 nacos 这款中间件，不然项目无法启动。快速部署一个可用的nacos，能快速开发项目就显得比较重要，所以下文通过两种方式来介绍快速部署nacos，其中kubernetes还提供集群的模式。

docker-compose 部署 Nacos

下载配置文件，进入/nacos/docker文件夹，以下是 docker-compose.yaml 的设置

version: "2"
services:
  nacos:
    image: nacos/nacos-server:1.2.1
    container_name: nacos_standalone_mysql
    env_file:
      - ./env/nacos-standlone-mysql.env
    volumes:
      - ./standalone-logs/:/home/nacos/logs
      - ./init.d/custom.properties:/home/nacos/init.d/custom.properties
    ports:
      - 30848:8848
      - 9555:9555
    depends_on:
      - nacos_mysql
    links:
      - nacos_mysql:mysql
    restart: on-failure
  nacos_mysql:
    container_name: nacos_mysql
    image: nacos/nacos-mysql:5.7
    env_file:
      - ./env/mysql.env
    volumes:
      - ./mysql:/var/lib/mysql
  prometheus:
    container_name: nacos_rometheus
    image: prom/prometheus:v2.19.0
    volumes:
      - ./prometheus/prometheus-standalone.yaml:/etc/prometheus/prometheus.yml
    depends_on:
      - nacos
    restart: on-failure
  grafana:
    container_name: nacos_grafana
    image: grafana/grafana:7.0.3
    restart: on-failure

通过 docker-compose 启动 nacos

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# cd 到 nacos/docker 目录
$ cd nacos/docker
$ docker-compose up -d

kubernetes 部署 Nacos 集群

kubernetes 部署 nacos 分为两部分，分别部署 nacos-server 和 nacaos-mysql；文件目录在/nacos/kubernetes，nacos-server.yaml 的设置如下

---
apiVersion: v1
kind: Service
metadata:
  name: nacos-headless
  labels:
    app: nacos-headless
spec:
  ports:
    - port: 8848
      name: server
      targetPort: 8848
      nodePort: 30848
  selector:
    app: nacos
  sessionAffinity: ClientIP
  type: NodePort
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nacos-cm
data:
  mysql.db.name: "nacos_devtest"
  mysql.port: "3306"
  mysql.user: "nacos"
  mysql.password: "nacos"
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: nacos
spec:
  serviceName: nacos-headless
  replicas: 3  # 根据你的kubernetes集群node的数量决定，如果只有两个node,可以设置成2
  template:
    metadata:
      labels:
        app: nacos
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
    spec:
      affinity:
        podAntiAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            - labelSelector:
                matchExpressions:
                  - key: "app"
                    operator: In
                    values:
                      - nacos-headless
              topologyKey: "kubernetes.io/hostname"
      containers:
        - name: k8s-nacos
          imagePullPolicy: Always
          image: nacos/nacos-server:1.2.1
          resources:
            requests:
              memory: "2Gi"
              cpu: "500m"
          ports:
            - containerPort: 8848
              name: client
          env:
            - name: NACOS_REPLICAS
              value: "3"
            - name: MYSQL_SERVICE_DB_NAME
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.db.name
            - name: MYSQL_SERVICE_PORT
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.port
            - name: MYSQL_SERVICE_USER
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.user
            - name: MYSQL_SERVICE_PASSWORD
              valueFrom:
                configMapKeyRef:
                  name: nacos-cm
                  key: mysql.password
            - name: NACOS_SERVER_PORT
              value: "8848"
            - name: NACOS_APPLICATION_PORT
              value: "8848"
            - name: PREFER_HOST_MODE
              value: "hostname"
            - name: NACOS_SERVERS
              value: "nacos-0.nacos-headless.default.svc.cluster.local:8848 nacos-1.nacos-headless.default.svc.cluster.local:8848 nacos-2.nacos-headless.default.svc.cluster.local:8848"
  selector:
    matchLabels:
      app: nacos

nacos-mysql.yaml 的设置如下

apiVersion: v1
kind: ReplicationController
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  replicas: 1
  selector:
    name: mysql
  template:
    metadata:
      labels:
        name: mysql
    spec:
      containers:
      - name: mysql
        image: reg.dascom.cn/spring-cloud/nacos-mysql:5.7
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: mysql-data
          mountPath: /var/lib/mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "root"
        - name: MYSQL_DATABASE
          value: "nacos_devtest"
        - name: MYSQL_USER
          value: "nacos"
        - name: MYSQL_PASSWORD
          value: "nacos"
      volumes:
      - name: mysql-data
        hostPath:
          path: /var/lib/mysql
---
apiVersion: v1
kind: Service
metadata:
  name: mysql
  labels:
    name: mysql
spec:
  ports:
  - port: 3306
    targetPort: 3306
  selector:
    name: mysql

通过 kubectl create 启动 nacos

# cd 到 nacos/kubernetes 目录
$ cd nacos/kubernetes
$ kubectl create -f nacos-mysql.yaml
$ kubectl create -f nacos-server.yaml

打开 nacos 控制台

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地址：http://localhost:30848/nacos
用户名：nacos
密码：nacos