Logstash TLS Cert JKS to PKCS8 Invalid Key Error
The cause of this error:
ERROR logstash.inputs.beats - Looks like you either have an invalid key or your private key was not in PKCS8 format.{:exception=>java.lang.IllegalArgumentException: File does not contain valid private key: /ELK/logstash/SSL/p8key.pem}is because ssl_key_passphrase => "password" was not set in the logstash input.
And this error:
ERROR org.logstash.beats.BeatsHandler - Exception: not an SSL/TLS recordis because non-SSL/TLS traffic was attempting to go through the SSL/TLS port. In this case, the culprit was filebeat.
https://www.elastic.co/guide/en/x-pack/current/security-troubleshooting.html