Splunk Search

Use extracted field in a subsearch

kochera
Communicator

Hi,

I would like to combine two searches. The first one gives me the session-id which i would like to use in a second search, e.g.

Query 1: index=main 123.123.123.156 source="/appl/log/www/access.log" |rex field=raw "\"\s\"(?[A-z,0-9,-.]+)"

Query 2: index=main $SessionID$ source="/appl/log/www/access.log"

Cheers, Andy

Tags (2)
0 Karma
1 Solution

MuS
SplunkTrust
SplunkTrust

Hi kochera

you could use something like that (I used a different regex for this example!):

index="main" 123.123.123.156 source="/appl/log/www/access.log" [search index="main" source="/appl/log/www/access.log" | rex field=_raw "(?i)^(?:[^-]*-){5}\s+(?P.+)" | fields requestid ]

the sub search will result in a list of:

( ( requestid="xxxxxxxxxxxxxxxxx" ) OR ( requestid="xxxxxxxxxxxx" ) OR ( requestid="xxxxxxxxx" ) )

and this will be used in the search.

hope this helps

MuS

View solution in original post

MuS
SplunkTrust
SplunkTrust

Hi kochera

you could use something like that (I used a different regex for this example!):

index="main" 123.123.123.156 source="/appl/log/www/access.log" [search index="main" source="/appl/log/www/access.log" | rex field=_raw "(?i)^(?:[^-]*-){5}\s+(?P.+)" | fields requestid ]

the sub search will result in a list of:

( ( requestid="xxxxxxxxxxxxxxxxx" ) OR ( requestid="xxxxxxxxxxxx" ) OR ( requestid="xxxxxxxxx" ) )

and this will be used in the search.

hope this helps

MuS

View solution in original post

kochera
Communicator

if I leave the IP away, then I see results but as you mentioned, this doesn't make any sense...

0 Karma

MuS
SplunkTrust
SplunkTrust

okay leave the IP completely away in any search; but then I wonder why are you using a sub search anyway?

kochera
Communicator

yes, that's what I'm trying at the moment

index=main source="/appl/log/www/access.log" [search index=main source="/appl/log/www/access.log" "123.123.123.156" |rex field=raw "\"\s\"(?[A-z,0-9,-.]+)"| fields + sessionid]

But somehow I don't get any results...

0 Karma

MuS
SplunkTrust
SplunkTrust

well then just leave the IP away in the main search, then you should see any SessionID of any IP.

kochera
Communicator

Hi, thanks for your answer. I'm not sure if this gives me the correct result. I would like to check if the same SessionID is used with a different IP-Adress.

0 Karma
.conf21 Now Fully Virtual!
Register for FREE Today!

We've made .conf21 totally virtual and totally FREE! Our completely online experience will run from 10/19 through 10/20 with some additional events, too!