Installing UFW firewall on Debain or Ubuntu LInux

Fig.01: Installing UFW firewall on Debain or Ubuntu LInux

Fig.01: Installing UFW firewall on Debain or Ubuntu LInux

The uncomplicated firewall (UFW) is easy to to manager a firewall on your Debian or Ubuntu based server.

Step 1: Update your system.

$ sudo apt-get update
$ sudo apt-get upgrade

Step 2: Installing UFW

$ sudo apt-get install ufw
Sample outputs:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  ufw
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 138 kB of archives.
After this operation, 733 kB of additional disk space will be used.
Get:1 http://ftp.us.debian.org/debian/ stable/main ufw all 0.33-2 [138 kB]
Fetched 138 kB in 2s (66.5 kB/s)
Preconfiguring packages ...
Selecting previously unselected package ufw.
(Reading database ... 85541 files and directories currently installed.)
Preparing to unpack .../archives/ufw_0.33-2_all.deb ...
Unpacking ufw (0.33-2) ...
Processing triggers for systemd (215-17+deb8u4) ...
Processing triggers for man-db (2.7.0.2-5) ...
Setting up ufw (0.33-2) ...

Creating config file /etc/ufw/before.rules with new version

Creating config file /etc/ufw/before6.rules with new version

Creating config file /etc/ufw/after.rules with new version

Creating config file /etc/ufw/after6.rules with new version
update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
Processing triggers for systemd (215-17+deb8u4) ...

Examples and usage: How to setup a UFW firewall on Ubuntu 16.04 LTS server