Hey Andresito123!
Nice Lab setup!
The experience of working through these items will serve you well in the exam and beyond!
Your config looks good, and the fact that _internal logs are making it to the indexers means your forwarding/receiving setup looks good! Searching index=_internal and making sure all your hosts are present is a great place to start all your forwarder troubleshooting. How about searching index=_internal host=<yourforwarder> error OR warn anything interesting?
Splunk indexers have syslog as a default props, so you should be good there.
Now, Lets work from the forwarder and see what we can discover:
I noticed that your input lacks an index. Are you just trying to send to default index? out of the box, that would be the 'main' index. if you search index=main over all time....you definitely aren't receiving?
The forwarder has some really great debug commands. Try these from /opt/splunkforwarder/bin:
./splunk list foraward-server
this will confirm your active forwards (you already did this by checking _internal, but figured I'd share anyhow as it is very useful)
./splunk list inputstatus
You should see your UDP input there...how does it look?
Can I assume you are running the forwarder as root? You would need root to listen on ports lower than 1024.
How about the output of netstat -tulpn on your forwarder ( I assume you are on *nix)? Is splunkd listening on 514?
When you pushed the app, did you configure it to restart the forwarder? In the Deployment Server, it should show, "after installation - Enable app, restart splunkd". Have you tried restarting the forwarder already manually?
If you check all these and still not seeing anything, lemme know and we'll move along...
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