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Spring Cloud Sleuth使用ELK收集&分析日志

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Spring Cloud

TIPS

本文基于Spring Cloud Greenwich SR2，理论兼容Spring Cloud所有版本。

应用整合

加依赖：

<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-sleuth</artifactId>
    </dependency>
    <dependency>
      <groupId>net.logstash.logback</groupId>
      <artifactId>logstash-logback-encoder</artifactId>
      <version>6.1</version>
    </dependency>

注意， logstash-logback-encoder 的版本务必和Logback兼容，否则会导致应用启动不起来，而且不会打印任何日志！可前往 https://github.com/logstash/logstash-logback-encoder 查看和Logback的兼容性。

在 resources 目录下创建配置文件：logback-spring.xml ，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/defaults.xml"/>
    
    <springProperty scope="context" name="springAppName" source="spring.application.name"/>
    <!-- Example for logging into the build folder of your project -->
    <property name="LOG_FILE" value="/Users/reno/Desktop/未命名文件夹/elk/logs/${springAppName}"/>

    <!-- You can override this to have a custom pattern -->
    <property name="CONSOLE_LOG_PATTERN"
              value="%clr(%d{yyyy-MM-dd HH:mm:ss.SSS}){faint} %clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n${LOG_EXCEPTION_CONVERSION_WORD:-%wEx}"/>

    <!-- Appender to log to console -->
    <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <!-- Minimum logging level to be presented in the console logs-->
            <level>DEBUG</level>
        </filter>
        <encoder>
            <pattern>${CONSOLE_LOG_PATTERN}</pattern>
            <charset>utf8</charset>
        </encoder>
    </appender>

    <!-- Appender to log to file -->
    <appender name="flatfile" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_FILE}</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_FILE}.%d{yyyy-MM-dd}.gz</fileNamePattern>
            <maxHistory>7</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>${CONSOLE_LOG_PATTERN}</pattern>
            <charset>utf8</charset>
        </encoder>
    </appender>
    
    <!-- Appender to log to file in a JSON format -->
    <appender name="logstash" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${LOG_FILE}.json</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${LOG_FILE}.json.%d{yyyy-MM-dd}.gz</fileNamePattern>
            <maxHistory>7</maxHistory>
        </rollingPolicy>
        <encoder class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <timestamp>
                    <timeZone>UTC</timeZone>
                </timestamp>
                <pattern>
                    <pattern>
                        {
                        "severity": "%level",
                        "service": "${springAppName:-}",
                        "trace": "%X{X-B3-TraceId:-}",
                        "span": "%X{X-B3-SpanId:-}",
                        "parent": "%X{X-B3-ParentSpanId:-}",
                        "exportable": "%X{X-Span-Export:-}",
                        "pid": "${PID:-}",
                        "thread": "%thread",
                        "class": "%logger{40}",
                        "rest": "%message"
                        }
                    </pattern>
                </pattern>
            </providers>
        </encoder>
    </appender>
    
    <root level="INFO">
        <appender-ref ref="console"/>
        <!-- uncomment this to have also JSON logs -->
        <appender-ref ref="logstash"/>
        <!--<appender-ref ref="flatfile"/>-->
    </root>
</configuration>

新建 bootstrap.yml ，并将application.yml 中的以下属性移到bootstrap.yml 中。
```
spring:
  application:
    name: user-center
```
由于上面的 logback-spring.xml 含有变量（例如 springAppName ），故而 spring.application.name 属性必须设置在 bootstrap.yml 文件中，否则，logback-spring.xml 将无法正确读取属性。

测试

启动应用

日志会打印到 /Users/reno/Desktop/未命名文件夹/elk/logs/目录中 ，并且文件名称为 user-center.json ，内容类似如下：

{"@timestamp":"2019-08-29T02:38:42.468Z","severity":"DEBUG","service":"microservice-provider-user","trace":"5cf9479e966fb5ec","span":"5cf9479e966fb5ec","parent":"","exportable":"false","pid":"13144","thread":"http-nio-8000-exec-1","class":"o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor","rest":"Using 'application/json;q=0.8', given [text/html, application/xhtml+xml, image/webp, image/apng, application/signed-exchange;v=b3, application/xml;q=0.9, */*;q=0.8] and supported [application/json, application/*+json, application/json, application/*+json]"}
{"@timestamp":"2019-08-29T02:38:42.469Z","severity":"DEBUG","service":"microservice-provider-user","trace":"5cf9479e966fb5ec","span":"5cf9479e966fb5ec","parent":"","exportable":"false","pid":"13144","thread":"http-nio-8000-exec-1","class":"o.s.w.s.m.m.a.RequestResponseBodyMethodProcessor","rest":"Writing [Optional[User(id=1, username=account1, name=张三, age=20, balance=100.00)]]"}
{"@timestamp":"2019-08-29T02:38:42.491Z","severity":"DEBUG","service":"microservice-provider-user","trace":"5cf9479e966fb5ec","span":"5cf9479e966fb5ec","parent":"","exportable":"false","pid":"13144","thread":"http-nio-8000-exec-1","class":"o.s.o.j.s.OpenEntityManagerInViewInterceptor","rest":"Closing JPA EntityManager in OpenEntityManagerInViewInterceptor"}
{"@timestamp":"2019-08-29T02:38:42.492Z","severity":"DEBUG","service":"microservice-provider-user","trace":"5cf9479e966fb5ec","span":"5cf9479e966fb5ec","parent":"","exportable":"false","pid":"13144","thread":"http-nio-8000-exec-1","class":"o.s.web.servlet.DispatcherServlet","rest":"Completed 200 OK"}
{"@timestamp":"2019-08-29T02:38:58.141Z","severity":"ERROR","service":"microservice-provider-user","trace":"","span":"","parent":"","exportable":"","pid":"13144","thread":"ThreadPoolTaskScheduler-1","class":"o.s.c.alibaba.nacos.discovery.NacosWatch","rest":"Error watching Nacos Service change"}

下面，只需要让Logstash收集到这个JSON文件，就可以在Kibana上检索日志啦！

ELK搭建

简单起见，本文使用Docker搭建ELK；其他搭建方式，请看官自行百度，比较简单，但很耗时。

创建 docker-compose.yml 文件，内容如下：

version: '3'
services:
  elasticsearch:
    image: elasticsearch:7.3.1
    environment:
      discovery.type: single-node
    ports:
      - "9200:9200"
      - "9300:9300"
  logstash:
    image: logstash:7.3.1
    command: logstash -f /etc/logstash/conf.d/logstash.conf
    volumes:
      # 挂载logstash配置文件
      - ./config:/etc/logstash/conf.d
      - /Users/reno/Desktop/未命名文件夹/elk/logs/:/opt/build/
    ports:
      - "5000:5000"
  kibana:
    image: kibana:7.3.1
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200
    ports:
      - "5601:5601"

需要注意，上面的 /Users/reno/Desktop/未命名文件夹/elk/logs/ 需要改成你应用的打印路径。

在docker-compose.yml文件所在目录创建 config/logstash.conf ，内容如下：

input {
  file {
    codec => json
    path => "/opt/build/*.json"  # 改成你项目打印的json日志文件。
  }
}
filter {
  grok {
    match => { "message" => "%{TIMESTAMP_ISO8601:timestamp}\s+%{LOGLEVEL:severity}\s+\[%{DATA:service},%{DATA:trace},%{DATA:span},%{DATA:exportable}\]\s+%{DATA:pid}\s+---\s+\[%{DATA:thread}\]\s+%{DATA:class}\s+:\s+%{GREEDYDATA:rest}" }
  }
}
output {
  elasticsearch {
    hosts => "elasticsearch:9200"  # 改成你的Elasticsearch地址
  }
}