I'm starting to get a lot of these errors on my forwarders. Any suggestions? Pushing /etc/security/limits.conf doesn't sound ideal.
I'm running heavy forwarders as root.
limits.conf shouldn't come into play unless you explicity have 'nofile' defined.
This is actually a pretty typical issue on the systems I've seen, and quite easily fixed.
I typically double the number of open files to start.
Using a RHEL/Fedora/Cent OS vi /etc/profile
20,000 number of open files ulimit -n 20000
I then 'source' /etc/profile so my current shell will apply that new value
Verify 'ulimit -n'
Then restart splunk.
Verify splunk applied the new settings by viewing splunk/var/log/splunkd.log
Looking for this line "INFO ulimit - Limit: open files: 20000 files"
You probably should work with support and/or investigate which files are open by looking in proc, or using lsof. We might be a bit too aggressive in how many files we open in the new tailing code, but that's just a wild guess.