使用ELK日志收集SpringBoot日志

ELK安装我就不多说了，之前说过，elk安装，下来直接说怎么弄吧

这里以logback日志为例，在项目中加入logstash-logback-encoder依赖，完整pom如代码清单所示。

<?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>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.baiked</groupId>
    <artifactId>springboot_logstash</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>springboot-logstash</name>
    <description>springboot-logstash</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>net.logstash.logback</groupId>
            <artifactId>logstash-logback-encoder</artifactId>
            <version>5.3</version>
        </dependency>

    </dependencies>


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

</project>

接下来新建一个logback-spring.xml文件，配置logback日志信息，注意这里配置的destination属性，输出的要和logstash配置的对应上，不然收集不上，内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <include resource="org/springframework/boot/logging/logback/base.xml" />

    <appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender">
        <destination>127.0.0.1:8888</destination>
        <!-- 日志输出编码 -->
        <encoder charset="UTF-8"
                class="net.logstash.logback.encoder.LoggingEventCompositeJsonEncoder">
            <providers>
                <timestamp>
                    <timeZone>UTC</timeZone>
                </timestamp>
                <pattern>
                    <pattern>
                        {
                        "logLevel": "%level",
                        "serviceName": "${springAppName:-}",
                        "pid": "${PID:-}",
                        "thread": "%thread",
                        "class": "%logger{40}",
                        "rest": "%message"
                        }
                    </pattern>
                </pattern>
            </providers>
        </encoder>
    </appender>

    <root level="INFO">
        <appender-ref ref="LOGSTASH" />
        <appender-ref ref="CONSOLE" />
    </root>

</configuration>

修改启动类，加入一个mvc方法，主要用于输出日志，如下所示。

package com.baiked;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class SpringbootLogstashApplication {

    Logger logger = LoggerFactory.getLogger(SpringbootLogstashApplication.class);

    @GetMapping("test")
    public void test(){
        logger.info("测试初始一些日志吧！");
    }

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

}

logstash配置如下，再次提醒一下，输入要与刚刚配置的对应上，输出为本地es：

input {
  tcp {
    mode => "server"
    host => "0.0.0.0"
    port => 8888
    codec => json_lines
  }
}
output {
  elasticsearch {
    hosts => "localhost:9300"
    index => "springboot-logstash-%{+YYYY.MM.dd}"
  }
}