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https://issues.apache.org/jira/browse/LOG4J2-3436?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Karwasz resolved LOG4J2-3436.
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Resolution: Duplicate
[~ragini],
Thanks for the configuration sample, which clarifies what is the source of the
problem.
I believe you are affected by
[LOG4J2-3359|https://issues.apache.org/jira/browse/LOG4J2-3359]. Unlike Log4j
1.x, currently the layout you configure using the Log4j 1.2 bridge is used to
provide the *entire* content of the SysLog packet (Log4j 1.x used it just for
the _MESSAGE_ part of the packet).
Log4j is sending invalid packets to the Syslog server and the server tries to
correct them adding (always the same) _PRI_ and _HEADER_ part. It's not Log4j,
but the Syslog server that adds {{localhost.localdomain}}.
If this hypothesis is correct, removing the layout configuration will actually
fix the hostname problem (and introduce another one :-) ).
> Log4j 2 syslogAppender prints localhost.localdomain instead of actual hostname
> ------------------------------------------------------------------------------
>
> Key: LOG4J2-3436
> URL: https://issues.apache.org/jira/browse/LOG4J2-3436
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders, Log4j 1.2 bridge
> Environment: Using log4j 2 bridge API: snapshot version of 2.17.3
> log4j-1.2-api-2.17.3.jar
> Reporter: Ragini Gawande
> Assignee: Piotr Karwasz
> Priority: Blocker
>
> We are trying to use syslogAppender for our logging but in the logs its
> prints localhost.localdomain instead of actual hostname
> <13>Mar 14 22:33:41 *localhost.localdomain* Main[6133] +05:30 2022 572 1
> com.test.common.logging.Test | FINE#com.test.common.logging.Level - Can
> print FINE
> <13>Mar 14 22:33:41 *localhost.localdomain* Main[6133] +05:30 2022 572 1
> com.test.common.logging.Test | INFO#com.test.common.logging.Level - Can
> print Info
>
> Here we are using snapshot version of log4j 2.17.3
> This issue was not seen when using log4j 2.17.1
>
> Additional info:
> JDK 1.8
> -Dlog4j1.compatibility=true
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