Logstash收集Tomcat日志

1.安装Tomcat

1.安装java环境
[root@web01 ~]# rpm -ivh jdk-8u181-linux-x64.rpm

2.上传包
[root@web01 ~]# rz apache-tomcat-10.0.0-M7.tar.gz

3.解压
[root@web01 ~]# tar xf apache-tomcat-10.0.0-M7.tar.gz -C /usr/local/

4.做软连接
[root@web01 ~]# ln -s /usr/local/apache-tomcat-10.0.0-M7 /usr/local/tomcat

5.启动Tomcat
[root@web01 ~]# /usr/local/tomcat/bin/startup.sh

6.访问页面 10.0.0.7:8080

2.配置Logstash收集Tomcat日志到文件

[root@web01 ~]# vim /etc/logstash/conf.d/tomcat_file.conf
input {
  file {
    path => "/usr/local/tomcat/logs/localhost_access_log.*.txt"
    start_position => "beginning"
  }
}
output {
  file {
    path => "/tmp/tomcat_%{+YYYY-MM-dd}.log"
  }
}

3.配置Logstash收集Tomcat日志到ES

[root@web01 ~]# vim /etc/logstash/conf.d/tomcat_es.conf
input {
  file {
    path => "/usr/local/tomcat/logs/localhost_access_log.*.txt"
    start_position => "beginning"
  }
}
output {
  elasticsearch {
    hosts => ["10.0.0.51:9200"]
    index => "tomcat_%{+YYYY-MM-dd}.log"
  }
}

三、收集Tomcat日志修改格式

#收集tomcat日志，当遇到报错时，一条报错会被分割成很多条数据，不方便查看

解决方法：
1.修改tomcat日志格式为json
	1）开发修改输出日志为json
	2）修改tomcat配置，日志格式为json
2.使用logstash的input插件下的mutiline模块

1.方法一：修改tomcat日志格式

1）配置tomcat日志为json格式

[root@web01 ~]# vim /usr/local/tomcat/conf/server.xml
#把原来的日志格式注释，添加我们的格式
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="tomcat_access_json" suffix=".log"
               pattern="{&quot;clientip&quot;:&quot;%h&quot;,&quot;ClientUser&quot;:&quot;%l&quot;,&quot;authenticated&quot;:&quot;%u&quot;,&quot;AccessTime&quot;:&quot;%t&quot;,&quot;method&quot;:&quot;%r&quot;,&quot;status&quot;:&quot;%s&quot;,&quot;SendBytes&quot;:&quot;%b&quot;,&quot;Query?string&quot;:&quot;%q&quot;,&quot;partner&quot;:&quot;%{Referer}i&quot;,&quot;AgentVersion&quot;:&quot;%{User-Agent}i&quot;}"/>

2）重启tomcat

[root@web01 ~]# /usr/local/tomcat/bin/shutdown.sh
[root@web01 ~]# /usr/local/tomcat/bin/startup.sh

3）配置收集新的tomcat日志

[root@web01 ~]# vim /etc/logstash/conf.d/tomcat_json_es.conf
input {
  file {
    path => "/usr/local/tomcat/logs/tomcat_access_json.*.log"
    start_position => "beginning"
  }
}
output {
  elasticsearch {
    hosts => ["10.0.0.51:9200"]
    index => "tomcat_json_%{+YYYY-MM-dd}.log"
  }
}

2.方法二：使用mutiline模块收集日志

1）配置收集日志测试

[root@web01 ~]# vim /etc/logstash/conf.d/test_mutiline.conf
input {
  stdin {
    codec => multiline {
	  #以[开头
      pattern => "^["
      #匹配到
      negate => true
      #向上合并，向下合并是next
      what => "previous"
    }
  }
}
output {
  stdout {
    codec => json
  }
}

#测试，输入内容不会直接输出，当遇到以 [ 开头才会收集以上的日志

2）配置收集tomcat错误日志

[root@web01 ~]# vim /etc/logstash/conf.d/tomcat_mutiline.conf 
input {
  file {
    path => "/usr/local/tomcat/logs/tomcat_access_json.*.log"
    start_position => "beginning"
    codec => multiline {
      pattern => "^["
      negate => true
      what => "previous"
    }
  }
}

output {
  elasticsearch {
    hosts => ["10.0.0.51:9200"]
    index => "tomcat_json_%{+YYYY-MM-dd}"
    codec => "json"
  }
}

3）将错误日志写入

[root@web01 ~]# cat 1.txt >> /usr/local/tomcat/logs/tomcat_access_json.2020-08-14.log

4）页面查看数据