Update page '1. Installing Fail2Ban'

1.-Installing-Fail2Ban.md

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+Installing an up-to-date Fail2Ban (Debian/Ubuntu)
+
+The F2B version available via apt for Debian/Ubuntu is old and does *not* support IP6 (as at the time of this document being written).  So let's grab a newer version from the source at github.
+
+*Note: Only versions 0.10+ offer IP6 support.*
+
+- Switch to your home directory or somewhere you can work with downloaded files.
+- Get the latest version of Fail2Ban, switch to the created directory and install it using the python installer script.
+
+  ```Bash
+  # get latest fail2ban version
+  git clone https://github.com/fail2ban/fail2ban.git
+  # change to the newly created directory containing f2b
+  cd fail2ban
+  # run the installer
+  sudo python setup.py install
+  ```
+
+- Let's test the installation by running fail2ban-client.  If it displays the help screen, then things are probably set up properly.
+
+  ```Bash
+  fail2ban-client -h
+  ```
+
+- Now, let's configure systemd to load fail2ban automatically on system start-up.
+
+  ```Bash
+  # copy the service file to the correct location
+  sudo cp files/debian-initd /etc/init.d/fail2ban
+  # tell systemd to refresh itself to recognize the new service
+  sudo update-rc.d fail2ban defaults
+  ```
+
+- Let's go ahead and start the service to make sure it doesn't run into any problems.  You should not see any errors reported and should have a pleasant 'green dot' showing up.
+- *--full --no-pager* means display everything and wrap output so it isn't cut off and we can actually read it!
+
+  ```Bash
+  # start the service
+  sudo systemctl start fail2ban.service
+  # check it's status for any errors
+  sudo systemctl --full --no-pager status fail2ban.service
+  ```
+
+- One more test just to be sure everything is set up.  You should see f2b report it's version without any errors being generated.
+
+  ```Bash
+  fail2ban-client version
+  ```
+
+That's it!  Fail2Ban is set up and running on your system.  Now we have to apply our configuration.