topic Set Field based on another field in Splunk Search

Set Field based on another field

axsolis — Wed, 17 Nov 2010 05:54:46 GMT

I am trying to create a field that contains information about the type of host based on the host field. For example, I have DMZ servers and Private servers. DMZ servers always have a hostname that ends in a "z" and Private servers always have a hostname that end in a "p". I would like to create a field to equal "DMZ" when the host ends in "z" and "Private" when host ends in "p".

There might be an easier way to do this but my ultimate goal is to timechart certain logs by location of servers. SO if I have 20 servers on the DMZ and 80 servers on the Private LAN all servers will be grouped by location in a timechart. (hope this make sense to somebody 🙂

example: ....|timechart count by LocationField

I am a Splunk newbie so please forgive me if I am going about this the wrong way.

Thanks.

Re: Set Field based on another field

Stephen_Sorkin — Wed, 17 Nov 2010 06:14:07 GMT

You can use the case statement in eval to do this:

... | eval LocationField = case(host LIKE "%p", "private", host LIKE "%z", "DMZ")

Re: Set Field based on another field

sideview — Wed, 17 Nov 2010 06:14:42 GMT

This will do it.

<your search>  | eval hostType=if(substr(host,-1)=="z","DMZ","private")

Re: Set Field based on another field

axsolis — Thu, 18 Nov 2010 21:20:45 GMT

Thanks! that woked! Now is there a way to place this in some sort of function so I do not have to write the entire case() portion again? Or is there a way to make the LocationField permanent so LocationField will always come up in results?

Thanks for any help provided!

Re: Set Field based on another field

Stephen_Sorkin — Thu, 18 Nov 2010 22:38:33 GMT

I'd recommend making a search macro for this. You'd then invoke as: ... | setlocation | ...