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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Configuring log format for console output (catalina.out)
Date Tue, 21 May 2019 14:53:35 GMT
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Joan,

On 5/21/19 09:11, Joan wrote:
> Hi all,
> 
> I am trying to forward the logs generated on a server to a
> centralized log collector (using rsyslog), one of the features I
> would like to use the ability to group messages by using their
> timestamp as the start of the message. By reading the documentation
> at https://tomcat.apache.org/tomcat-9.0-doc/logging.html#Console, I
> can't see the proper way to  get a common format (preferably with
> timestamp), or ar tleast save the outputs into three different
> types in different files?

I think you are being confused by the fact that the default log
pattern contains a newline character. For example, these are the first
two entries in my local catalina.out file:

Apr 12, 2019 1:55:03 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8215"]
Apr 12, 2019 1:55:03 PM org.apache.tomcat.util.net.NioSelectorPool
getSharedSelector
INFO: Using a shared selector for servlet write/read
Apr 12, 2019 1:55:03 PM org.apache.coyote.AbstractProtocol init

(Apologies for the word-wrapping)

The first entry is [Apr 12, 2019 1:55:03 PM] and the text ends with
["ajp-nio-8215"]

The second entry has the same timestmp and the text ends with
"AbstractProtocol init"

Stack traces are always impossible to handle when looking at the
resulting file, since they almost always span multiple lines of text
- -- that is, they have embedded newlines in the message.

Are you asking about how to make sense of the log file, how to send
log messages to a central server, or how to coalesce log messages by
timestamp?

- -chris
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