splunk

Splunk Tip: Regex Extractions in Props.conf

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When you create an extraction in props.conf (a search-time field), you specify the name of the new field through a named capture group in the regular expression. For example:

EXTRACT-foo =  (?P<foo>\w+)

This configuration will create a field "foo" with a value of the first word found in the _raw field. You can also specify a field besides _raw in your extraction:

EXTRACT-foo =  (?P<foo>\w+) in host

How to Delete Splunk Events When Using a Transforming Command

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Recently, I needed to delete some events that matched certain summary conditions. For example, where the event count exceeds a certain threshold:

Example showing event search with stats criteria

Now, if you try to delete the events by appending | delete, you'll receive an error:

Error in 'delete' command: This command cannot be invoked after the non-streaming command 'stats'

How to Utilize Post-Process Searches in Splunk Simple XML and HTML

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It took me a while to figure out how to use a Post-Process Search in a Splunk Dashboard, so I thought it would be a good idea to remind my future self how it's done.

This is a Simple XML dashboard. It is essentially the same as the example in my last post. The full source code is attached to this post.

In order to use a Post Process search, only three changes are needed:

Dashboards are for Reporting, not Calculating

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Since it is so easy to search for data in Splunk, and then create a dashboard in just a couple of clicks, you might be tempted to do just that -- and release your dashboard into production. For some situations, that's absolutely fine. But as your organization becomes more reliant on Splunk dashboards, this approach can become unwieldy. And if there's anything we want, it's wieldy searches!

Splunk: One Search or Two?

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One of the most common scenarios I experience in Splunk is where I need to use data from two different indexes at once—typically in order to build management and reporting dashboards. With my background in developing applications on relational databases, my first attempts at this solution used the "join" command in Splunk. Once I realized that a combination of the "append" and "stats" commands can be a better choice, I started using those more. But today I will show an even better, faster approach!

How to delete duplicate events in Splunk

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I use Splunk to report on business objects moreso than typical security operation data. For instance, helpdesk tickets rather than firewall logs. I have created various Python scripts to import these business objects from various REST and SQL sources, and I want these import scripts to be idempotent. That is, I want to import helpdesk tickets every day, but no more than once per day, regardless of how many times the import script is called.

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