centos7的一些基本操做

1. 防火牆的開啓與關閉

‍     centos7的防火牆設置和之前不同了，必定要注意。</br>
  

It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:

systemctl stop firewalld
systemctl mask firewalld

Then, install the iptables-services package:

yum install iptables-services

Enable the service at boot-time:

systemctl enable iptables

Managing the service

systemctl [stop|start|restart] iptables

Saving your firewall rules can be done as follows:

service iptables save

or

/usr/libexec/iptables/iptables.init save

2.開啓端口


開啓端口
firewall-cmd --zone=public --add-port=80/tcp --permanent

命令含義：
--zone #做用域
--add-port=80/tcp #添加端口，格式爲：端口/通信協議
--permanent #永久生效，沒有此參數重啓後失效

重啓防火牆
firewall-cmd --reload

參考：https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Security_Guide/sec-Using_Firewalls.html

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