Introduction Push notifications let your Android application notify a user of an event, even when the user is not using your app. The goal of this tutorial is to send a simple push notification to your app. We'll use Ubuntu 14.04 and Python 2.7 on the server, and Google Cloud Messaging as the push notification service. We'll use the term server to refer to the instance spun up with DigitalOcean. We'll use GCM to refer ... Read more
Introduction In this tutorial, we will demonstrate how to install Phusion Passenger as your Rails-friendly web server, which is easy to install, configure, and maintain. We will integrate it into Apache on Ubuntu 14.04. By the end of this tutorial, we will have a test Rails application deployed on our Droplet. If you prefer Nginx over Apache, take a look at how to deploy a Rails app with Passenger and Nginx on Ubuntu 14.04 by ... Read more
Introduction On October 14th, 2014, a vulnerability in version 3 of the SSL encryption protocol was disclosed. This vulnerability, dubbed POODLE (Padding Oracle On Downgraded Legacy Encryption), allows an attacker to read information encrypted with this version of the protocol in plain text using a man-in-the-middle attack. Although SSLv3 is an older version of the protocol which is mainly obsolete, many pieces of software still fall back on SSLv3 if better encryption options are not ... Read more
Introduction Docker is a great tool for deploying your servers. While lets you upload your Docker creations to their registry for free, anything you upload is also public. This probably isn't what you want for a non-open source-project. This guide will show you how to set up and secure your own private Docker registry. By the end of this tutorial you will be able to push a custom Docker image to your private registry, ... Read more
Introduction After setting up the bare minimum configuration for a new server, there are some additional steps that are highly recommended in most cases. In this guide, we'll continue the configuration of our servers by tackling some recommended, but optional procedures. Prerequisites and Goals Before you start this guide, you should run through the Ubuntu 14.04 initial server setup guide. This is necessary in order to set up your user accounts, configure privilege elevation with ... Read more
Introduction If you are a Ruby on Rails developer, you probably need a web server to host your web apps. This tutorial shows you how to use Phusion Passenger as your Rails-friendly web server. Passenger is easy to install, configure, and maintain and it can be used with Nginx or Apache. In this tutorial, we will install Passenger with Nginx on Ubuntu 14.04. An alternate method to deploy your Rails app is with this 1-Click ... Read more
Introduction Mumble is a free and open-source Voice Over IP (VoIP) application designed primarily to be used by gamers. Mumble is similar to TeamSpeak and Ventrilo. Mumble uses a client-server architecture which allows users to talk to each other when connected to the same server. It has a simple administration interface, and features low-latency, high-quality codecs. In this tutorial we will learn how to install and configure Murmur, which is the server component of Mumble. ... Read more
Introduction VNC, or "Virtual Network Computing", is a connection system that allows you to use your keyboard and mouse to interact with a graphical desktop environment on a remote server. VNC makes managing files, software, and settings on a remote server easier for users who are not yet comfortable with working with the command line. In this guide, we will be setting up VNC on an Ubuntu 14.04 server and connecting to it securely through ... Read more
Introduction Most businesses require several server types such as file servers, print servers, email servers, etc. Zentyal combines these services and more, as a complete small business server for Linux. Zentyal servers are simple to use because of the Graphical User Interface (GUI). The GUI provides an easy and intuitive interface for use by novice and experienced administrators alike. Command-line administration is available, too. We'll be showing how to use both of these methods in ... Read more
Introduction Metadata is a service provided to DigitalOcean droplets that allows a droplet to access data about itself, i.e. its metadata. Examples of available droplet metadata include user-provided user data , droplet ID, data center region, and IP addresses. In addition to basic droplet metadata retrieval, Metadata allows users to provide arbitrary user data to their droplets at creation, which can be consumed by CloudInit to ease the provisioning of cloud servers. Metadata is currently ... Read more