Install 1. OS (AMI Linux 2) $ cat /etc/system-release Amazon Linux release 2 (Karoo) 2. Installed Package releated krb5 ntp $ sudo yum list installed | grep krb krb5-devel.x86_64 1.15.1-19.amzn2.0.3 @amzn2-core krb5-libs.x86_64 1.15.1-19.amzn2.0.3 @amzn2-core krb5-server.x86_64 1.15.1-19.amzn2.0.3 @amzn2-core krb5-workstation.x86_64 1.15.1-19.amzn2.0.3 @amzn2-core pam_krb5.x86_64 2.4.8-6.amzn2.0..