SpringCloud使用Sofa-lookout监控(基于Eureka)

本文介绍SpringCloud使用Sofa-lookout，基于Eureka服务发现。

1.前景

本文属于是前几篇文章的后续，其实一开始感觉这个没有什么必要写的，但是最近一个朋友问我关于这个的问题，所以想着还是写一篇基于Eureka监控使用Pormetheus监控Sofa-Lookout监控的文章。

前几篇文章请看：

《SpringBoot使用prometheus监控》

《SpringBoot使用SOFA-Lookout监控》

《SpringCloud使用Prometheus监控(基于Eureka)》

至于使用consul服务发现监控这里就不介绍了，网上的文章很多，千篇一律。这一篇与上面的这个文章还是有一些不同的，Sofa-Lookout是通过暴露一个端口来进行监控，比较特殊，所以这里给大家借鉴一下。

2.Eureka Server

本文还是需要在Eureka上面加入eureka-consul-adapter依赖，eureka-consul-adapter项目github地址：

https://github.com/twinformatics/eureka-consul-adapter

这里在介绍一下Eureka Server内容，就是在普通Eureka Server基础上加入上述依赖，完整pom如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dalaoyang</groupId>
    <artifactId>springcloud_sofalookout_server</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud_sofalookout_server</name>
    <description>springcloud_sofalookout_server</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>at.twinformatics</groupId>
            <artifactId>eureka-consul-adapter</artifactId>
            <version>1.1.0</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

配置文件如下：

server.port=8761

eureka.instance.hostname=localhost
eureka.client.service-url.defaultZone=http://${eureka.instance.hostname}:${server.port}/eureka/

##禁止自己向自己注册
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false

启动类如下：

package com.dalaoyang;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer //启动服务注册中心
public class SpringcloudSofalookoutServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringcloudSofalookoutServerApplication.class, args);
    }

}

3.Eureka Client

这里有一些是与之前《SpringBoot使用SOFA-Lookout监控》文章不同的地方，首先在pom文件中加入sofa依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.dalaoyang</groupId>
    <artifactId>springcloud_sofalookout_client</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud_sofalookout_client</name>
    <description>springcloud_sofalookout_client</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.alipay.sofa.lookout</groupId>
            <artifactId>lookout-sofa-boot-starter</artifactId>
            <version>1.5.2</version>
        </dependency>
        <dependency>
            <groupId>com.alipay.sofa.lookout</groupId>
            <artifactId>lookout-reg-prometheus</artifactId>
            <version>1.5.2</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

配置文件配置如下：

##端口号
server.port=8888
##服务名称
spring.application.name=springboot_sofalookout_client
##EurekaServer
eureka.client.service-url.defaultZone=http://server1:8761/eureka/

com.alipay.sofa.lookout.prometheus-exporter-server-port=8081
eureka.instance.metadata-map.address=${spring.cloud.client.ip-address}:${com.alipay.sofa.lookout.prometheus-exporter-server-port}

其中需要解释如下两个参数：

com.alipay.sofa.lookout.prometheus-exporter-server-port：sofa-lookout端口
eureka.instance.metadata-map.address：封装的Eureka元信息，内容是真正sofa-lookout数据的地址，方便稍后prometheus使用，这个属性不是必须要叫这个名字！！！

4.Prometheus

prometheus配置如下：

# 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:
  - job_name: 'prometheus'
    static_configs:
    - targets: ['127.0.0.1:9090']

  - job_name: 'consul-prometheus'
    consul_sd_configs:
      - server: '172.16.103.33:8761'
        services: [SPRINGBOOT_SOFALOOKOUT_CLIENT]
    relabel_configs:
      - source_labels: ['__meta_consul_metadata_address']
        target_label:  __address__

这里有几点需要注意的：

172.16.103.33是我的内网IP，这个不需太多关注。
relabel_configs标签用于修改一些默认配置，比如本文使用__meta_consul_metadata_address属性替代__address__属性，这里的__meta_consul_metadata_address属性值就是我们在application.properties中的eureka.instance.metadata-map.address属性值，这个是eureka-consul-adapter依赖为我们转换的。
上面两个属性怎么获取的？接下来告诉你！