Logstash file input plugin

问题:

Currently I am using file input plugin to go over my log archive but file input plugin is not the right solution for me because file input plugin inherently expects that file is stream of events and not as a static file. Now, this is causing a great deal of problem for me because my log archive has a 100,000 + log files and I logstash opens a handle on all these files which are never going to change.

I am facing following problems

1) Logstash fails with problem mentioned in SO
2) With those many open file handles log archival storage is getting very slow.

Does anybody know a way to let logstash know that treat files statically or once a file is processed do not keep file handle on it.

In logstash Jira bug, I was told to write my own plugin with some other suggestions which won't help me much.

回答1:

Logstash file input can process static file. You need to add this configuration

file {
     path => "/your/logs/path"
     start_position => "beginning"
}

After adding the start_position, logstash reads the file from the beginning. Please refer here for more information. Remember that

this option only modifies “first contact” situations where a file is new and not seen before. If a file has already been seen before, this option has no effect.

Otherwise you have set your sincedb_path to /dev/null .

For the first question, I have answer in the comment. Please try to add the maximum file opened. For my suggestion, You can try to write a script copy the log file to the logstash monitor path and move it out constantly. You have to estimate the time that logstash process a log file.

回答2:

look out for this also turn on -v and --debug for logstash

{:timestamp=>"2016-05-06T18:47:35.896000+0530",
 :message=>"_discover_file: /datafiles/server.log: 
**skipping because it was last modified more than 86400.0 seconds ago**",
 :level=>:debug, :file=>"filewatch/watch.rb", :line=>"330",
 :method=>"_discover_file"}

solution is to touch the file or change the ignore_older setting