Ubuntu检查UFW防火墙的状态。

# ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip

我们有多种选项如何打开端口80和443。

首先，我们可以直接指定希望打开端口的端口号或者服务。

$ sudo ufw allow 80
$ sudo ufw allow 443
OR
$ sudo ufw allow http
$ sudo ufw allow https

或者，如果我们希望打开特定Web服务器的端口，例如Apache或者Nginx：

$ sudo ufw allow in "Apache Full"
$ sudo ufw allow in "Nginx Full"

检查当前的防火墙配置设置：

# ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
To                         Action      From
--                         ------      ---
80                         ALLOW IN    Anywhere                  
443                        ALLOW IN    Anywhere                  
80 (v6)                    ALLOW IN    Anywhere (v6)             
443 (v6)                   ALLOW IN    Anywhere (v6)

删除端口80,443 防火墙规则 ：

$ sudo ufw delete allow 80
$ sudo ufw delete allow 443
OR
$ sudo ufw delete allow http
$ sudo ufw delete allow https

或者，如果我们希望删除特定Web服务器的端口，例如Apache或者Nginx：

$ sudo ufw delete allow in "Apache Full"
$ sudo ufw delete allow in "Nginx Full"