I've been spending the last month experimenting with Splunk. Lately, i've tried to reroute a specific event to the nullQueue, with the intention of preventing it from being indexed:
May 18 12:52:43 lnx-iadevopsnode2 kubelet: E0518 12:52:43.207579 4688 file.go:76] Unable to read manifest path "/etc/kubernetes/manifests": path does not exist, ignoring
Using the following
[kubelet] TRANSFORMS-manifest = setmanifestnull
[setmanifestnull] REGEX=(Unable to read) DEST_KEY=queue FORMAT=nullQueue
The default index is main. When i run a realtime search:
index=main, the event still occurs. However, if i change the search to
index=main sourcetype=kubeletthe event does not occur.
Why could this be?
The Splunk routing and filtering that you have is only applied to events of sourcetype
kubelet. If there are similar events coming from other sourcetypes, those will not be filtered and be shown when you just search with index=main.. Try to run this and see which sourcetypes are showing events which you wanted to filter.
index=main "Unable to read" | stats count by sourcetype
If you want to drop it from all sourcetypes, just set the same (you can still reference your existing transforms.conf stanza) for those sourcetypes.
It is showing only one sourcetype: kubelet.
I should mention that the sourcetype kubelet is created by a field extraction.
[source::/var/log/messages] TRANSFORMS-messagetype = messagetype
[messagetype] DEST_KEY = MetaData:Sourcetype REGEX = :\d\d .*? (.*?(?=:)) FORMAT = $1
A sourcetype that was set using a TRANSFORMS statement cannot be used for other index time configurations. Splunk will only apply index-time stanzas matching the original sourcetype, not the new sourcetype from the transforms.
So to achive this, either put the nullqueue transform under the source stanza, or put it under the correct souretype stanza and perhaps make the regex a bit more specific, such that it still only matches kubelet events.
Also: your sourcetype override is not defined correctly. It should be:
FORMAT = sourcetype::$1. That is why your search including
sourcetype = kubelet doesn't return results I guess.