Splunk Search

What is the difference between a lookup search and index searches?

fariapm1
Explorer

Hi,

I need your help in order to get the difference between two searches. I have a task running once a day on all my servers and if the task is succeed it generates an event log that is sent to Splunk. 
I need to know which servers didn’t generate that event. At this moment the result should be 1 server that is offline. But I don't get any results. But each search returns the list of my servers

- 1st search is a lookup table (static) with all my servers:

| inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| table Hostname
| rename Hostname as ComputerName

- 2nd search (aleatory) is the list of servers that has a specific event generated once a day from the eventvwr index:

index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-8h
| table ComputerName

After google it, I found these 2 ways, but I'm not getting the result I want:

| set diff
[search index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-8h
| table ComputerName]

[search inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| table Hostname
|rename Hostname as ComputerName]

And also tried:

| inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| table Hostname
| rename Hostname as ComputerName
Where NOT [search index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-26m
| table ComputerName,]


Can you point me in the right direction?

Labels (1)
Tags (2)
0 Karma
1 Solution

ITWhisperer
SplunkTrust
SplunkTrust
| inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| table Hostname
| rename Hostname as ComputerName
| dedup ComputerName
| eval from=1
| append [search index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-26m
| dedup ComputerName
| table ComputerName
| eval from=2]
| stats sum(from) as from by ComputerName

from will equal 1 if it is only in the lookup, 2 if only in the index and 3 if in both lookup and index

View solution in original post

0 Karma

fariapm1
Explorer

Hi,

I had to make some changes because of the case sensitive, but it's the same search:

by adding the condition where from=1 now Ican see only the server that I need!

| inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| eval ComputerName=lower(Hostname)
| table ComputerName
| dedup ComputerName
| eval from=1
| append [search index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-16h
| eval ComputerName=lower(substr(ComputerName, 1, 10))
| dedup ComputerName
| table ComputerName
| eval from=2]
| stats sum(from) as from by ComputerName | where from=1 | table ComputerName
Many thanks ITWhisperer

0 Karma

ITWhisperer
SplunkTrust
SplunkTrust
| inputlookup ctx_arc_hardware.csv
| where HW_State="Active" AND (Group="XenApp APPS" OR Group="XenApp RBT")
| table Hostname
| rename Hostname as ComputerName
| dedup ComputerName
| eval from=1
| append [search index=eventviewer sourcetype=ctxevent EventCode=200 earliest=-26m
| dedup ComputerName
| table ComputerName
| eval from=2]
| stats sum(from) as from by ComputerName

from will equal 1 if it is only in the lookup, 2 if only in the index and 3 if in both lookup and index

0 Karma
Get Updates on the Splunk Community!

Technical Workshop Series: Splunk Data Management and SPL2 | Register here!

Hey, Splunk Community! Ready to take your data management skills to the next level? Join us for a 3-part ...

Spotting Financial Fraud in the Haystack: A Guide to Behavioral Analytics with Splunk

In today's digital financial ecosystem, security teams face an unprecedented challenge. The sheer volume of ...

Solve Problems Faster with New, Smarter AI and Integrations in Splunk Observability

Solve Problems Faster with New, Smarter AI and Integrations in Splunk Observability As businesses scale ...