Useful Linux ufw commands

I had just install Apache Httpd server, and found the documentation had some useful Useful FireWall (ufw) commands, which makes it even easier to configure ufw.

ufw app list

The ufw documentation says

ufw supports application integration by reading profiles located in

/etc/ufw/applications.d. To list the names of application profiles known to ufw, use:

ufw app list

Users can specify an application name when adding a rule (quoting any profile names with spaces). For example, when using the simple syntax, users can use:

ufw allow <name>

Or for the extended syntax:
ufw allow from 192.168.0.0/16 to any app <name>

My commands

ufw app list

gave me

Available applications:
  Apache
  Apache Full
  Apache Secure
  CUPS
  OpenSSH
  Postfix
  Postfix SMTPS
  Postfix Submission

sudo ufw allow ‘Apache’

gave me

Rule added
Rule added (v6)

sudo ufw status gave me

Status: active

To                         Action      From
--                         ------      ----
Anywhere                   ALLOW       10.1.1.2                  
...                  
Apache                     ALLOW       Anywhere                  
...             
Apache (v6)                ALLOW       Anywhere (v6)    

Really useful functions!