topic Re: Time in Splunk in Installation

Time in Splunk

pck1983 — Fri, 08 Sep 2023 08:43:30 GMT

Hello,

I have a few questions about the time in Splunk. That is a entry from an older logfile and here the _time field and the timestamp in the log does not match!

4/30/23
1:32:16.000 PM

Mai 08 13:32:16 xxxxxx sshd[3312558]: Failed password for yyyyyyyy from 192.168.1.141 port 58744 ssh2

How could that happen?

How does time come up with the time fields? And how does it handle files which comtain no time-stamps? Is then the index-time used?

Ther is a few things which I do not fully understand - maybe there is some article in the documentation which explain that in detail but I have not found with a quick search.

Could pleas someone clearify how splunk handle that or link to an article? Thanks!

Re: Time in Splunk

gcusello — Fri, 08 Sep 2023 09:01:48 GMT

Hi @pck1983,

the timestamp format is defined for each sourcetype in the props.conf (for more infos see at https://docs.splunk.com/Documentation/ITSI/4.17.0/Configure/props.conf) to deploy to the Forwarders that ingested tha log and on the Search Head.

The timestamp format definitions are described at https://docs.splunk.com/Documentation/SCS/current/Search/Timevariables

In your case, you have to set:

[your_sourcetype] TIME_PREFIX = ^ TIME_FORMAT = %b %d %H:%M:%S

Ciao.

Giuseppe

Re: Time in Splunk

pck1983 — Fri, 08 Sep 2023 09:14:15 GMT

Hi Giuseppe,

so that was a parsing error - make sence because a hand full of older entries hat another formating. The majority of the entries from that older logfile where indexed correctly!

Just that I understand it - Splunk parses the event and extract a time from the event. That parsed time is stored in _time. The indextime is stored in _indextime.

In case there is not time entry in the file the indextime ist also used for _time.

Correct so far?

But what if I get events from machines in different timezones? Is _time converted fo my local timezone?

What does it mean when I search for events from today 6:00am till 10:00am? Does that mean 6:00am - 10:00am in my timezone? Or in the timezones of the machines?

Re: Time in Splunk

gcusello — Fri, 08 Sep 2023 09:27:28 GMT

Hi @pck1983,

here you can find some useful description of how Splunk manages timezones:

https://docs.splunk.com/Documentation/SCS/current/Search/Timezones

https://docs.splunk.com/Documentation/SplunkCloud/latest/Data/Applytimezoneoffsetstotimestamps

In few words, yes, if Splunk isn't able to understand the timestamp, is uses the previous event timestamp or _indextime as _time.

Splunk automatically manages different timezones so, setting the timezone in your user preferences, you can read the timestamps using the timestamp corresponding to your timezone.

Ciao.

Giuseppe