All Apps and Add-ons

Linux DHCP new regex,New dhcp log format

nocsolcon
Explorer

We've upgraded our DHCP server to debian 9. Now the dhcp log is written differently then on our old server
log lines contains now: dhcpd[1569]: instead of dhcpd:

Jul 18 09:12:43 dhcp-server-name dhcpd[1569]: DHCPACK on ip-address to 00:00:00:00:00:00 (modem-type) via ip-address

the app: Linux DHCP can not handle this

can we change the regex in transform.conf

from:
\s(dhcpd):\s

to:
\sdhcpd(:\s|[\d+]:\s)

or should we change more? I tested it, but this change to transform.conf does not work

0 Karma

FrankVl
Ultra Champion

Try escaping those [ ] characters. They have special meaning in regular expressions, so if you want to match actual brackets, they need to be escaped: \sdhcpd(\:\s|\[\d+\]\:\s) https://regex101.com/r/pRwz3z/1

nocsolcon
Explorer

I've fixed it by changing all the regex in the transforms.conf

from:

\s(dhcpd)\:\s

to:

 \sdhcpd(\:\s|\[\d+\]:\s)

Also we need to change the file: eventtypes.conf

from:

[dhcpd_event]
search = process=dhcpd

to:

[dhcpd_event]
search = dhcpd

After this, it is working for the old and new log lines

0 Karma

FrankVl
Ultra Champion

Why the double backslashes?

0 Karma

nocsolcon
Explorer

Sorry, my mistake. I changed it.

0 Karma
Got questions? Get answers!

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Meet up IRL or virtually!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

Get Updates on the Splunk Community!

Index This | What travels the world but is also stuck in place?

April 2026 Edition  Hayyy Splunk Education Enthusiasts and the Eternally Curious!   We’re back with this ...

Discover New Use Cases: Unlock Greater Value from Your Existing Splunk Data

Realizing the full potential of your Splunk investment requires more than just understanding current usage; it ...

Continue Your Journey: Join Session 2 of the Data Management and Federation Bootcamp ...

As data volumes continue to grow and environments become more distributed, managing and optimizing data ...