How to process multiline log entry with logstash filter?

Question

Background:

I have a custom generated log file that has the following pattern :

[2014-03-02 17:34:20] - 127.0.0.1|ERROR| E:\\xampp\\htdocs\\test.ph         


        

Answer 1

The multiline filter will add the "\n" to the message. For example:

"[2014-03-02 17:34:20] - 127.0.0.1|ERROR| E:\\xampp\\htdocs\\test.php|123|subject|The error message goes here ; array (\n  'create' => \n  array (\n    'key1' => 'value1',\n    'key2' => 'value2',\n    'key3' => 'value3'\n  ),\n)"

However, the grok filter can't parse the "\n". Therefore you need to substitute the \n to another character, says, blank space.

mutate {
    gsub => ['message', "\n", " "]
}

Then, grok pattern can parse the message. For example:

 "content" => "The error message goes here ; array (   'create' =>    array (     'key1' => 'value1',     'key2' => 'value2',     'key3' => 'value3'   ), )"