Basic Ubuntu and docker setup.
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Quick commands to setup a Ubuntu VPS with docker.

##Step 1: Create a new user with sudo privileges.

sudo groupadd admin
sudo groupadd docker
sudo usermod -a -G admin,docker <LOGIN>

##Step 1.5: (optional) Logout, login as username.

##Step 2: Update/upgrade.

sudo aptitude update
sudo aptitude upgrade -y

##Step 3: Install docker. Thanks to

sudo aptitude install linux-image-extra-`uname -r` -y
sudo sh -c "wget -qO- | apt-key add -"
sudo sh -c "echo deb docker > main/etc/apt/sources.list.d/docker.list"
sudo aptitude update
sudo aptitude install lxc-docker -y

##Step 4: Enable UFW forwarding for docker. Just use sed. Working in Ubuntu 14.04.

sudo sed -i "s/DEFAULT_FORWARD_POLICY=\"\(DROP\|ACCEPT\)\"/DEFAULT_FORWARD_POLICY=\"ACCEPT\"/g" /etc/default/ufw

##Step 5: Enable UFW.

sudo ufw allow ssh
sudo ufw reload #Some images enable ufw by default, in that case juse reload settings  
sudo ufw enable

##Step 6: Enable fail2ban.

sudo aptitude install fail2ban -y
sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
#optional: sudo vi /etc/fail2ban/jail.conf
sudo service fail2ban restart

##Step 7: DNS Just update the A records at the host.

  1. First record: '' (blank) NAME field
  2. Second record: '*' NAME field
  3. Third record: 'www' NAME field