Manage system entropy

Entropy is used to calculate random data that is used by the system in cryptographic operations. Some environments with low entropy may have intermittent performance issues with SSL-based communication. This is more typical on virtual machines, but can occur in physical instances as well. Monitor the kernel.random.entropy_avail in sysctl value for best results.

If necessary, update $JAVA_HOME/jre/lib/security/java.security to use file:/dev/./urandom for the securerandom.source property.