I want to save all _grokparsefailure entries in a file to review them later, however

My output configuration portion:

if "_grokparsefailure" in [tags] { file { path => "/home/myaccount/testfolder/grokfailures" file_mode => 0600 } }
    file { path => "/home/myaccount/testfolder/groksuccess" file_mode => 0600 }

My grok filter works as a charm and all logs go into groksuccess.
However, when I deliberately change the grok filter not to match my entries I can see them in /var/log/logstash/logstash-plain.log being tagged with _grokparsefailure and yet they don't go into my grokfailures file.

Any help please?

I think the file plugin can only be used in the output object. So you would need to do it like this:

output {
    if "_grokparsefailure" in [tags] {
        file { 
            path => "/tmp/grok-failed.log"

Indeed my code snipped is from the output object and still not working. Very odd. Thank you for your reply anyway.

Does that file exist, and do you have permissions to write to it?

Try removing the file_mode option, it does not work the way most folks would expect.

Hi @Badger, yes the file didn't existed and I created it. I also removed the file_mode and again no joy. Again, as I said the funny thing is that file groksuccess receives all the logs but whey they are tagged with _grokparsefailure they just won't go into file grokfailures
This is a single entry when I alter the regex to fail to match the logs and as you can see the _grokparsefailure tag is in there

Anyone else? Still haven't found a solution and its a bit frustrating.
Thank you all in advanced.

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