spring cloud nacos docker环境下单点部署

nacos 服务端部署镜像

单点模式下的docker-compose

version: "3.7"
services:
  nacos:
    image: nacos/nacos-server:2.0.3
    environment:
     PREFER_HOST_MODE: hostname
     MODE: standalone
    volumes:
     - /home/nacos/standalone-logs/:/home/nacos/logs
     - /home/nacos/init.d/custom.properties:/home/nacos/init.d/custom.properties
    ports:
     - "8848:8848"
     - "9848:9848"
    
  prometheus:
    image: prom/prometheus:latest
    volumes:
      - /etc/prometheus/prometheus-standalone.yaml:/etc/prometheus/prometheus.yml
    ports:
      - "9090:9090"
    depends_on:
      - nacos
    restart: always
    
  grafana:
    image: grafana/grafana:latest
    ports:
      - 3000:3000
    restart: always

custom.properties

#spring.security.enabled=false
#management.security=false
#security.basic.enabled=false
#nacos.security.ignore.urls=/**
#management.metrics.export.elastic.host=http://localhost:9200
# metrics for prometheus
management.endpoints.web.exposure.include=*

# metrics for elastic search
#management.metrics.export.elastic.enabled=false
#management.metrics.export.elastic.host=http://localhost:9200

# metrics for influx
#management.metrics.export.influx.enabled=false
#management.metrics.export.influx.db=springboot
#management.metrics.export.influx.uri=http://localhost:8086
#management.metrics.export.influx.auto-create-db=true
#management.metrics.export.influx.consistency=one
#management.metrics.export.influx.compressed=true

prometheus-standalone.yaml

# my global config
global:
  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
  # scrape_timeout is set to the global default (10s).

# Alertmanager configuration
alerting:
  alertmanagers:
    - static_configs:
        - targets:
          # - alertmanager:9093

# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
# - "first_rules.yml"
# - "second_rules.yml"

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=` to any timeseries scraped from this config.
  - job_name: 'prometheus'

    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.

    static_configs:
      - targets: ['localhost:9090']

  - job_name: 'nacos'
    metrics_path: '/nacos/actuator/prometheus'
    static_configs:
      - targets: ['nacos:8848']

nacos docker镜像支持的环境变量

名称	描述	默认值
MODE	cluster模式/standalone模式	cluster/standalone default cluster
NACOS_SERVERS	nacos cluster地址	eg. ip1,ip2,ip3
PREFER_HOST_MODE	是否支持hostname hostname/ip	default ip
NACOS_SERVER_PORT	nacos服务器端口	default 8848
NACOS_SERVER_IP	多网卡下的自定义nacos服务器IP
SPRING_DATASOURCE_PLATFORM	standalone 支持 mysql	mysql / empty default empty
MYSQL_MASTER_SERVICE_HOST	mysql 主节点host
MYSQL_MASTER_SERVICE_PORT	mysql 主节点端口	default : 3306
MYSQL_MASTER_SERVICE_DB_NAME	mysql 主节点数据库
MYSQL_MASTER_SERVICE_USER	数据库用户名
MYSQL_MASTER_SERVICE_PASSWORD	数据库密码
MYSQL_SLAVE_SERVICE_HOST	mysql从节点host
MYSQL_SLAVE_SERVICE_PORT	mysql从节点端口	default :3306
MYSQL_DATABASE_NUM	数据库数量	default :2
JVM_XMS	-Xms	default :2g
JVM_XMX	-Xmx	default :2g
JVM_XMN	-Xmn	default :1g
JVM_MS	-XX:MetaspaceSize	default :128m
JVM_MMS	-XX:MaxMetaspaceSize	default :320m
NACOS_DEBUG	开启远程调试 y/n	default :n
TOMCAT_ACCESSLOG_ENABLED	server.tomcat.accesslog.enabled	default :false

结合prometheus和grafana监控Nacos

Nacos 0.8.0版本之后支持通过暴露metrics数据接入第三方监控系统监控Nacos运行状态

搭建nacos并暴露metrics数据

按上文所示，搭建好环境后，修改 custom.properties 文件，暴露监控端点，随后访问 http:{ip}:8848/nacos/actuator/prometheus 可以看到数据

management.endpoints.web.exposure.include=*

通过prometheus采集Nacos metrics数据

访问 http://{ip}:9090/graph ，搜索 nacos_monitor 查看数据是否采集成功

通过grafana展示数据

访问 grafana: http://{ip}:3000 ，配置数据

• 配置prometheus数据源

  
  
  QQ截图20210916165617.png

• 导入Nacos grafana监控模版
  

  QQ截图20210916165827.png

• 导入成功后即可看到监控面板

  
  
  QQ截图20210916165914.png

nacos 开发端接入

1. 添加依赖

    com.alibaba.cloud
    spring-cloud-starter-alibaba-nacos-config
    2.2.6.RELEASE

注意 spring-cloud-alibaba-dependencies 与 spring-cloud-dependencies 有对应关系，阿里提供了毕业版本推荐依赖关系。
注意：版本 2.1.x.RELEASE 对应的是 Spring Boot 2.1.x 版本。版本 2.0.x.RELEASE 对应的是 Spring Boot 2.0.x 版本，版本 1.5.x.RELEASE 对应的是 Spring Boot 1.5.x 版本。

Spring Cloud Version	Spring Cloud Alibaba Version	Spring Boot Version
Spring Cloud 2020.0.1	2021.1	2.4.2
Spring Cloud Hoxton.SR9	2.2.6.RELEASE	2.3.2.RELEASE
Spring Cloud Greenwich.SR6	2.1.4.RELEASE	2.1.13.RELEASE
Spring Cloud Hoxton.SR3	2.2.1.RELEASE	2.2.5.RELEASE
Spring Cloud Hoxton.RELEASE	2.2.0.RELEASE	2.2.X.RELEASE
Spring Cloud Greenwich	2.1.2.RELEASE	2.1.X.RELEASE

2. 在 application.yml 中配置 Nacos server 的地址和应用名

spring:
  cloud:
    nacos:
      discovery:
        enabled: true
        service: {serviceName}
        server-addr: {ip:8848}

3. 在启动类上增加注解 @EnableDiscoveryClient 开启服务注册发现功能
4. 给RestTemplate实例添加 @LoadBalanced 注解，可以开启负载均衡