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Linux常用命令-48：ufw
source link: https://xugaoxiang.com/2022/06/14/linux-cmds-48-ufw/
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ufw程序用于管理防火墙。相比 iptables，使用起来更加简单，默认需要手动安装 sudo apt install ufw。
语法格式：ufw [参数]
常用参数：
# 启动
ufw enable
# 关闭
ufw disable
# 重启
ufw reload
# 显示防火墙状态及规则
ufw status
# 重置配置
ufw reset
# 允许外部访问80端口
ufw allow 80
# 禁止访问80端口
ufw delete allow 80
# 只允许特定网段访问
ufw allow from 172.21.2.10/24Recommend
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