Kerberos

env KRB5_TRACE=/dev/stdout

Blogs:

• https://www.centurion.link/w/programming/java/spnego
• https://steveloughran.gitbooks.io/kerberos_and_hadoop/content/sections/keytabs.html
• http://www.microhowto.info/howto/configure_apache_to_use_kerberos_authentication.html