CentOS6，7不同

centos6与centos7，防火墙，开机自启不同

6用iptables，7用firewall-cmd 
http://www.cnblogs.com/liyuanhong/articles/7064582.html

6用chkconfig，7用systemctl 
http://blog.csdn.net/u012486840/article/details/53161574