Nagios Support Forum

Posted: **Wed Aug 24, 2016 7:40 am**

I was wondering if there is an import filter that I can use as an example to import csv files into NLS.

Posted: **Wed Aug 24, 2016 9:41 am**

OK so I found this link:
https://www.elastic.co/guide/en/logstas ... s-csv.html
Went into NLS and created the filter:

CSV import filter

filter {
csv {
convert => { "TIMESTAMP" => "date_time", "CATEGORY" => "string", "EVENT" => "string", "USERID" => "string", "ROWSMODIFIED" => "int", "ROWSRETURNED" => "int", "INSTNAME" => "string", "HOSTNAME" => "string" }
}
}
}

My question is "Now that I have the filter created how do I emplement it for the forwarded csv files? How do I define if TAG = "xx" use CSV import filter.

Posted: **Wed Aug 24, 2016 10:11 am**

The filters usually contain some sort of conditional logic when addressing log types. For example, say I have the following input type for all my Linux audit logs:

Code: Select all

tcp {
    port => 5545
    type => audit_log
  }
  udp {
    port => 5545
    type => audit_log
  }

In that Input rule I am setting the type to audit_log for all traffic on port 5545. This means logs sent over that port will have their type set to audit_log. The corresponding filter that breaks up that audit log into the fields I want to analyze looks like this:

Code: Select all

if [type] == 'audit_log' {
    do my filtering
}

If the file exists logically in Linux, either as a path or in a mount point, you can use the file type to define an Input rule for that file:

Code: Select all

input {
    file {
        path => "/home/user/myfile.csv"
        start_position => beginning
        type => my_csv_type_tag_or_something
    }
}

At which point you could define a filter to work with that type:

Code: Select all

if [type] == 'my_csv_type_tag_or_something' {
    do csv things!
}

Posted: **Wed Aug 24, 2016 12:29 pm**

Can I use the tag to identify the stream? If so how would I do that.

Posted: **Wed Aug 24, 2016 1:24 pm**

Assuming there is a common value in the tags, you should be able to do that:

Code: Select all

if "value" in [tags] {
     do value things
}

Posted: **Thu Aug 25, 2016 11:47 am**

So...

This should work then?

# DB2 import filter

filter {
if "DB2" in [tags] {
csv {
convert => { "TIMESTAMP" => "date_time", "CATEGORY" => "string", "EVENT" => "string", "USERID" => "string", "ROWSMODIFIED" => "int", "ROWSRETURNED" => "int", "INSTNAME" => "string", "HOSTNAME" => "string" }
}
}
}
}

Posted: **Thu Aug 25, 2016 12:40 pm**

Not quite. For events in CSV format, it's helpful to define the columns before doing anything else:

Code: Select all

if [type] == 'csv_entry' {
csv { 
columns => ["TIMESTAMP", "CATEGORY", "EVENT", "USERID", "ROWSMODIFIED", "ROWSRETURNED", "INSTNAME", "HOSTNAME"]
}
}

That by itself should be enough to capture all the individual fields. Depending on how TIMESTAMP is formatted, you may need to then mutate that field for it to be recognized as a proper date_time or date in elasticsearch. If elasticsearch doesn't recognize the format of TIMESTAMP, it will probably default it's type to string. Which will still make the field itself searchable, just not as a proper date or date_time.

The resulting entry from the above filter:

2016_08_25_12_38_43_Dashboard_Nagios_Log_Server.png

My TIMESTAMP is poorly formatted, so it gets processed as a string by default:

2016_08_25_12_39_48_Dashboard_Nagios_Log_Server.png

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Is there an import filter to ingest csv files.

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