Github user grkvlt commented on the issue:
https://github.com/apache/brooklyn-server/pull/1003
> Service iptables save doesn't work with Centos7
That is, doesn't work with the CentOS 7 AMI we use on EC2, which has a
cut-down `service` command only supporting the standard _start_, _stop_,
_restart_ and _status_ command verbs.---
