直接命令：service firewalld stop
1. Disable Firewalld Service.
[root-centos7-tejas-barot-linux ~]
2. Stop Firewalld Service.
[root-centos7-tejas-barot-linux ~]
3. Install iptables service related packages.
[root-centos7-tejas-barot-linux ~]
4. Make sure service starts at boot:
[root-centos7-tejas-barot-linux ~]
# If you do not want ip6tables, You can skip following command.
[root-centos7-tejas-barot-linux ~]
5. Now, Finally Let’s start the iptables services.
[root-centos7-tejas-barot-linux ~]
# If you do not want ip6tables, You can skip following command.
[root-centos7-tejas-barot-linux ~]
Firewalld Service is now disabled and stop, You can use iptables.
原文：http://my.oschina.net/u/2345713/blog/489124