And if you are using a Heavy Forwarder, nf and nf reside there instead of Indexers. Note that if you are using Splunk in a distributed environment, nf and nf reside on the Indexers (also called Search Peers) while nf reside on the Search Heads. This is achieved through configuring nf, nf and nf. This process is also known as adding custom fields during index time. You can configure Splunk to extract additional fields during index time based on your data and the constraints you specify. By default Splunk extracts many fields during index time. The process of creating fields from the raw data is called extraction. Splunk automatically creates many fields for you. This kind of flexibility in exploring data will never be possible with simple text searching. The above SPL searches the index web which happens have web access logs, with sourcetype equal to access_combined, status grater than or equal to 500 (indicating a server side error) and response_time grater than 6 seconds (or 6000 milli seconds). For example, consider the following SPL index=web sourcetype=access_combined status>=500 response_time>6000 Fields in Splunkįields turbo charge your searches by enabling you to customize and tailor your searches. The values are “main”, “access_combined_wcookie” and “purchase” respectively. The fields in the above SPL are “index”, “sourcetype” and “action”. index=main sourcetype=access_combined_wcookie action=purchase Also, a given field need not appear in all of your events. Virtually all searches in Splunk uses fields. What is a field?Ī field is a name-value pair that is searchable. By fully reading this article you will gain a deeper understanding of fields, and learn how to use rex command to extract fields from your data. I’ll also reveal one secret command that can make this process super easy. In my experience, rex is one of the most useful commands in the long list of SPL commands. I’ll provide plenty of examples with actual SPL queries. In this article, I’ll explain how you can extract fields using Splunk SPL’s rex command. Unfortunately, it can be a daunting task to get this working correctly. The mvindex function takes two or three arguments and returns a subset of the multivalue field using the index values provided.One of the most powerful features of Splunk, the market leader in log aggregation and operational data intelligence, is the ability to extract fields while searching for data. Alternatively, splits field by using a regex. The delimiter can be a multicharacter delimiter. Using makemv command, we can converts a single valued field into a multivalue field by splitting the values on a simple string delimiter. For each result, the mvexpand command creates a new result for every multivalue field. Using mvexpand command, we can expands the values of a multivalue field into separate events, one event for each value in the multivalue field. Mvzip is mv eval function command, which combines 2 fields values to one field. Let’s combine all the fields values to one field value using mvzip command. We could see that, key_a field is under an array named as key_4. From above json sample data, we need to extract the key_a field. If we need to extract the specific field from array in json, we can mention the path, so that splunk can understand the key-value pair needed to be extracted. The spath command will extract the all fields automatically. If we run spath command to above sample json data, key-value pairs will extracted automatically. The supported arguments are INPUT, PATH, OUTPUT. The spath command is used to extract the fields from structured data format like json, xml etc. The fields created by spath are mostly multivalued fields, specially the fields extracted out of array. So the key_4 will points to the array elements following curly bracket Because the key_4, values showing as an array, which is in square brackets. Key_1, key_2, key_3 will be considered as fields, but key_4 won’t. Let’s understand, how splunk spath command will extract the fields from above json data.įrom above data, when we executed spath command, the first curly bracket is consider as opening and then the following key-value pairs will extracted directly. spath command will breakdown the array take the key as fields. We can use spath splunk command for search time fields extraction. JSON is structured data format with key-value pair rendered in curly brackets.
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