====== ポートを開放する ======

<code>
# ufw status verbose
</code>

<code>
To                         Action      From
--                         ------      ----
80/tcp (Apache)            ALLOW IN    Anywhere                  
80/tcp (Apache (v6))       ALLOW IN    Anywhere (v6)             
</code>

<code>
# ufw allow 8080
# ufw status verbose
</code>

<code>
To                         Action      From
--                         ------      ----
80/tcp (Apache)            ALLOW IN    Anywhere                  
8080                       ALLOW IN    Anywhere                  
80/tcp (Apache (v6))       ALLOW IN    Anywhere (v6)             
8080 (v6)                  ALLOW IN    Anywhere (v6)             
</code>

====== 不要なポートを閉じる ======
<code>
# ufw status verbose
</code>

<code>
To                         Action      From
--                         ------      ----
80/tcp (Apache)            ALLOW IN    Anywhere                  
8080                       ALLOW IN    Anywhere                  
80/tcp (Apache (v6))       ALLOW IN    Anywhere (v6)             
8080 (v6)                  ALLOW IN    Anywhere (v6)             
</code>

<code>
# ufw deny 8080
</code>

<code>
To                         Action      From
--                         ------      ----
80/tcp (Apache)            ALLOW IN    Anywhere                  
8080                       DENY IN     Anywhere                  
80/tcp (Apache (v6))       ALLOW IN    Anywhere (v6)             
8080 (v6)                  DENY IN     Anywhere (v6)   
</code>

<code>
# ufw delete deny 8080
</code>

使用中のポートを確認
<code>
nmap localhost
</code>

<code>
Starting Nmap 7.60 ( https://nmap.org ) at 2020-11-27 01:26 PST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.0000030s latency).
Not shown: 997 closed ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https
631/tcp open  ipp
</code>

ポートを使用しているデーモンを確認
<code>
lsof -i:631
</code>