Ubuntu18.04配置iptables开机生效：

vi /etc/rc.local

#!/bin/sh

iptables-restore < /etc/network/iptables.up.rules

:wq

chmod +x /etc/rc.local

vi /lib/systemd/system/rc.local.service

[Unit]

Description=/etc/rc.local

Compatibility Documentation=man:systemd-rc-local-generator(8)

ConditionFileIsExecutable=/etc/rc.local

After=network.target

[Service]

Type=forking

ExecStart=/etc/rc.local start

TimeoutSec=0

RemainAfterExit=yes

GuessMainPID=no

[Install]

WantedBy=multi-user.target

:wq

systemctl enable rc.local

验证：

重启服务器，执行iptables -L查看策略是否还在