一旦服务器重启了，之前配置好的iptables就会没了，这是我们需要一个iptables规则持久化的工具来帮我们管理iptables。上网搜索一番，感觉iptables-persistent这个工具就很好用，在ubuntu17.10下配置几乎为零，安装完了就好了。下面是安装的命令：
1 | sudo apt-get install iptables-persistent |
安装好后，当前的iptebles配置信息会自动保存在
1 2 | /etc/iptables/rules.v4/etc/iptables/rules.v6 |
两个文件中，现在重启服务器iptables的配置信息也会继续保持啦！
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