java - Send log4j2 stack traces over syslog -


i trying log stack traces logstash.

the logging stack elk (elasticsearch, logstash, kibana).

the application producing logs java application, using slf4j logging interface, , log4j2 logging implementation.

the log4j2.xml declares syslog appender, rfc5424 format:

<appenders>   <syslog name="rfc5424" format="rfc5424" host="localhost" port="8514"           protocol="tcp" appname="myapp" includemdc="true" mdcid="mdc"           facility="local0" enterprisenumber="18060" newline="true"           messageid="audit" id="app">     <loggerfields>       <keyvaluepair key="thread" value="%t"/>       <keyvaluepair key="priority" value="%p"/>       <keyvaluepair key="category" value="%c"/>       <keyvaluepair key="exception" value="%ex{full}"/>     </loggerfields>   </syslog> </appenders>

i log throwable java application so:

org.slf4j.loggerfactory.getlogger("exception_test").error("testing errors", new runtimeexception("exception message"));

when exception logged, logstash traces show me persists:

{    "@timestamp":"2016-11-08t11:08:10.387z",    "port":60397,    "@version":"1",    "host":"127.0.0.1",    "message":"<131>1 2016-11-08t11:08:10.386z mycomputer.local myapp - audit [mdc@18060 category=\"exception_test\" exception=\"java.lang.runtimeexception: exception message",    "type":"syslog",    "tags":[       "_grokparsefailure"    ] }

and confirm kibana displays same json within _source field of 1 of log entries.

there's problem here: no stack trace saved. , message, "testing errors", lost.

the "tags":["_grokparsefailure"] unfortunate not related question.

i tried adding <exceptionpattern/> see if change anything:

<syslog name="rfc5424" format="rfc5424" host="localhost" port="8514"         protocol="tcp" appname="myapp" includemdc="true" mdcid="mdc"         facility="local0" enterprisenumber="18060" newline="true"         messageid="audit" id="app">   <loggerfields>     <keyvaluepair key="thread" value="%t"/>     <keyvaluepair key="priority" value="%p"/>     <keyvaluepair key="category" value="%c"/>     <keyvaluepair key="exception" value="%ex{full}"/>   </loggerfields>   <exceptionpattern>%ex{full}</exceptionpattern> </syslog>

<exceptionpattern/> replaces log message, , also (sadly) omits loggerfields. give me class name , line number:

{    "@timestamp":"2016-11-08t11:54:03.835z",    "port":60397,    "@version":"1",    "host":"127.0.0.1",    "message":"at com.stackoverflow.logtest.throw(logtest.java:149)",    "type":"syslog",    "tags":[       "_grokparsefailure"    ] }

again: no stack trace. , again: message, "testing errors", lost.

how can use log4j2 log stack traces logstash? don't have use syslog appender.

essentially constraints are:

  • not locked in particular logging infrastructure (this why used syslog)
  • multi-line stack traces need understood being single log entry. it's undesirable "each line of stack trace" "a separate log message"
  • stack traces must able subjected filters. typical exception of mine can have page-long stack trace. want filter out frames spring.

log4j 2.5's syslogappender can only send stack traces on udp.

<syslog name="rfc5424" format="rfc5424" host="localhost" port="8514"         protocol="udp" appname="myapp" includemdc="true" mdcid="mdc"         facility="local0" enterprisenumber="18060" newline="true"         messageid="logtest" id="app">   <loggerfields>     <keyvaluepair key="thread" value="%t"/>     <keyvaluepair key="priority" value="%p"/>     <keyvaluepair key="category" value="%c"/>     <keyvaluepair key="exception" value="%ex{full}"/>   </loggerfields>   <exceptionpattern>%ex{full}</exceptionpattern> </syslog>

with udp: both exceptionpattern and loggerfields.keyvaluepair["exception"] start working solutions multiline stack traces.

this logstash prints when sent exception on udp via syslog:

{     "@timestamp" => 2016-11-14t13:23:38.304z,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "<131>1 2016-11-14t13:23:38.302z birchbox.local myapp - logtest [mdc@18060 category=\"com.stackoverflow.deeply\" exception=\"java.lang.runtimeexception: exception message\n\tat com.stackoverflow.deeply.complain(deeply.java:10)\n\tat com.stackoverflow.nested.complain(nested.java:8)\n\tat com.stackoverflow.main.main(main.java:20)\n\" priority=\"error\" thread=\"main\"] example error\njava.lang.runtimeexception: exception message\n\tat com.stackoverflow.deeply.complain(deeply.java:10)\n\tat com.stackoverflow.nested.complain(nested.java:8)\n\tat com.stackoverflow.main.main(main.java:20)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] }

inside [mdc@18060 exception=\"…\"] loggerfields.keyvaluepair["exception"] stack trace.

in addition this: stack trace inserted into logged message itself, exceptionpattern.

for reference: logstash prints when send exception on tcp via syslog (i.e. same syslogappender described above, protocol="tcp" instead):

{     "@timestamp" => 2016-11-14t19:56:30.293z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "<131>1 2016-11-14t19:56:30.277z birchbox.local myapp - audit [mdc@18060 category=\"com.stackoverflow.deeply\" exception=\"java.lang.runtimeexception: exception message",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.296z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.deeply.complain(deeply.java:10)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.296z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.nested.complain(nested.java:8)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.296z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.main.main(main.java:20)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.296z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "\" priority=\"error\" thread=\"main\"] example error",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.296z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "java.lang.runtimeexception: exception message",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.297z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.deeply.complain(deeply.java:10)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.298z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.nested.complain(nested.java:8)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.298z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "at com.stackoverflow.main.main(main.java:20)",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] } {     "@timestamp" => 2016-11-14t19:56:30.299z,           "port" => 63179,       "@version" => "1",           "host" => "127.0.0.1",        "message" => "",           "type" => "syslog",           "tags" => [         [0] "_grokparsefailure"     ] }

it looks tcp "work", splits single log message many syslog messages (for example when \n encountered).


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