Spring Cloud Sleuth使用ELK收集&分析日志

原创

lilizhou2008 2021-08-10 15:30:15 ©著作权

文章标签 spring json 5e ide elasticsearch 文章分类 代码人生

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TIPS

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

应用整合

1 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。

2 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>

3 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

1 启动应用

2 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。

1 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。

2 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  }}

3 启动ELK

docker-compose up

测试Sleuth & ELK

1 访问你微服务的API，让它生成一些日志（如果产生日志比较少，可将 org.springframework 包的日志级别设为 debug ）

2 访问 http://localhost:5601 （Kibana地址），可看到类似如下的界面，按照如图配置Kibana。

Spring Cloud Sleuth使用ELK收集&分析日志_5e

Spring Cloud Sleuth使用ELK收集&分析日志_spring_02

3 输入条件，即可分析日志：

Spring Cloud Sleuth使用ELK收集&分析日志_json_03

原理分析

原理比较简单：

•让Sleuth打印JSON格式的日志；•然后在Logstash的配置文件中，配置grok语法，解析并收集JSON格式的日志，并存储到Elasticsearch中去；•Kibana可视化分析日志。

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