未设置logback logstash编码器Syslog标头

Question

我的logback.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <conversionRule conversionWord="syslogStart" converterClass="ch.qos.logback.classic.pattern.SyslogStartConverter"/>

  <appender name="stash" class="net.logstash.logback.appender.LogstashSocketAppender">
    <host>localhost</host>
    <port>514</port>
    <prefix class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
      <layout class="ch.qos.logback.classic.PatternLayout">
        <pattern>%syslogStart{LOCAL5}</pattern>
      </layout>
    </prefix>
  </appender>

  <root level="INFO">
    <appender-ref ref="stash"/>
  </root>
</configuration>

当我查看wireshark的输出时，我只看到记录的JSON（没有给出PRI头字段）

 [truncated]Syslog message: (unknown): {"@timestamp":"2016-03-22T12:13:37.270+11:00","@version":1,"message":"Started App in 4.327 seconds (JVM running for 4.92)","logger_name":"au.com.xxx.App","threa

如果切换到标准logback Syslog appender（非JSON输出）

...
  <appender name="SYSLOG" class="ch.qos.logback.classic.net.SyslogAppender">
    <syslogHost>127.0.0.1</syslogHost>
    <Facility>LOCAL5</Facility>
    <SuffixPattern>%-5level MyApp %logger %msg</SuffixPattern>
  </appender>
...

 Syslog message: LOCAL5.INFO: Mar 22 12:31:03 sbmelmac-06390.local INFO  App au.com.App Started App in 11.292 seconds (JVM running for 29.336)

Answer 1

经过大量的思索，看起来这个示例的包装LayoutRappingEncoder部分出现了问题。

当我使用最新的SpringBoot版本时，一个logback配置异常会阻止应用程序的启动（以前的版本没有阻止应用程序的启动，即使出现了异常）。

Application startup failed
java.lang.IllegalStateException: Logback configuration error detected: 
ERROR in ch.qos.logback.core.joran.util.PropertySetter@10d307f1 - A "ch.qos.logback.core.encoder.LayoutWrappingEncoder" object is not assignable to a "ch.qos.logback.core.Layout" variable.
ERROR in ch.qos.logback.core.joran.util.PropertySetter@10d307f1 - The class "ch.qos.logback.core.Layout" was loaded by 
ERROR in ch.qos.logback.core.joran.util.PropertySetter@10d307f1 - [sun.misc.Launcher$AppClassLoader@73d16e93] whereas object of type 
ERROR in ch.qos.logback.core.joran.util.PropertySetter@10d307f1 - "ch.qos.logback.core.encoder.LayoutWrappingEncoder" was loaded by [sun.misc.Launcher$AppClassLoader@73d16e93].

因此，如果我删除包装LayoutRappingEncoder，并在前缀中使用模式实现，代码就可以工作，并且我可以在syslog头中看到正确的工具细节。

 <conversionRule conversionWord="syslogStart" converterClass="ch.qos.logback.classic.pattern.SyslogStartConverter"/>
 <appender name="JSON_SYSLOG" class="net.logstash.logback.appender.LogstashSocketAppender">
    <host>127.0.0.1</host>
    <port>514</port>
    <prefix class="ch.qos.logback.classic.PatternLayout">
       <pattern>%syslogStart{LOCAL5}</pattern>
    </prefix>
  </appender>

 [truncated]Syslog message: LOCAL5.INFO: Mar 22 14:12:18 sbmelmac-06390.local {"@timestamp":"2016-03-22T14:12:18.494+11:00","@version":1,"message":"Started App in 4.597 seconds (JVM running for 5.18)","logger":"au.com.myapp.