Neil Middleton - Heroku: Up and Running
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- Book:Heroku: Up and Running
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Take full advantage of Herokus cloud-based hosting services. This guide takes you through the inner workings of this PaaS platform and delivers practical advice for architecting your application to work as efficiently as possible. Youll learn best practices for improving speed and throughput, solving latency issues, locating and fixing problems if your application goes down, and ensuring your deployments go smoothly.
By covering everything from basic concepts and primary components to add-on services and advanced topics such as buildpacks, this book helps you effectively deploy and manage your application with Heroku.
- Learn your way around Heroku with the command line interface
- Discover several methods for scaling your application to increase throughput
- Speed up response time through performance optimizations
- Solve latency issues by deploying your Heroku instance in new regions
- Choose the right plan for using Herokus PostgreSQL database-as-a-service
- Get a checklist of items to consider when deploying your application
- Find and fix problems during deployment, at runtime, and when your application goes down
- Understand how Heroku buildpacks work, and learn how customize your own
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If youre old enough and lucky enough to have had access to a computer in the early 1990s, you may have experienced the joy and wonder that was an MS-DOS game. These games were marvels of their time, but a number of them required you to do something odd, which was reboot your computer and boot into the game itself, thus taking the operating system (OS) out of the equation while the game was running.
The reason was that the OS put constraints on the game program; it used up resources needed by the game and forced certain rules into place that werent necessarily helpful for the game to run efficiently.
As time moved on, this approach was no longer needed. Operating systems were becoming more advanced and games were able to run quite happily within their boundaries. The games were able to benefit from the additional help that the OS gave for interfacing with hardware and so on.
These days, we would never imagine running our games outside of the platform provided by the OS; its just too much work and involvement for the developer. Why would a developer rewrite a whole hardware interface or library of sound drivers when it can rely on those provided by the OS?
Now think about this in the context of the Web. In the early days of deployment, everything was very much a homegrown affair: developers and system administrators had to figure out a lot of how things bolted together themselves, and worry about the things they had missed. As time rolled on, more and more tools and software became available, which made their lives significantly easier.
These days, though, we have platforms such as Heroku, which you could almost consider to be one of the Webs operating systems. As a developer, you can write your application in the way a game designer wouldyou dont need to worry about the details of how your database server is set up and you dont need to worry about how your servers are kept up to date. Heroku is a platform that takes care of all of these things and allows you to integrate with it how you will.
Now, we are in a position where the idea of a developer building a server to host an application is becoming almost a bizarre route to take. Each day, hundreds of developers deploy applications, and fewer and fewer are getting involved in the nitty-gritty of infrastructure, instead choosing to use platforms such as Heroku.
This book is aimed at anyone who is already using Heroku in one form or another, and wants to learn more about the best ways to make use of the technology available. This book makes the assumption that you are already proficient in using your own language of choice and are happy using Git for your source control needs.
The book assumes no previous knowledge of Heroku itself, but you will get more from it if you have deployed an application or two to the platform already.
Lastly, you should not be afraid of documentation. There is a vast array of content available, both on the subject of Heroku itself and the various languages that can be deployed to it. Therefore, instead of repeating that content, we encourage you, the reader, to go out and review whatever you can find on a given topic.
Heroku is still a relatively young company, having only started in 2007 (making Heroku younger than the Apple iPhone!). Back then, the three foundersJames Lindenbaum, Adam Wiggins, and Orion Henrywere all working together at a small web development agency, and found that the amount of time spent deploying an application once having built it was not proportional. For instance, they were commonly finding that an application might take a month to develop, but then they would need to spend a week deploying the application to the Web.
After a while, they started developing applications using Ruby on Rails. With this came a newfound productivity, yet the time for deployment hadnt changed. Therefore, the three of them had the idea of bringing the same sort of efficiencies to application hosting.
In six weeks, an idea was developed and a prototype was built: a simple platform that was easy to deploy to and straightforward for a developer to figure out.
Interestingly, the initial prototype was nothing like the Heroku you see today. For instance, one major component was an application called Heroku Garden (although it wasnt known by this name at the time), a web-based code editor that users could log into and use to edit their code via a browser (see ). Once you hit Save, the code was deployed and running on the Web, ready for users to see. Interestingly, there are more web-based code editors popping up in 2013, which shows how far ahead of the curve it was.
Over time, however, Heroku found that more and more of its target users were interested in the application hosting aspect of the product instead of the web-based editor. Therefore, Heroku developed an API that developers could use alongside Git, the source control system. Developers could also use the API to push their code to the Heroku platform.
Use of this API grew, and Heroku took the decision to turn off Heroku Garden completely. In January 2009, Heroku relaunched and rebranded itself as a Ruby/Rack deployment platform, and interest in and adoption of the product grew significantly.
Heroku is constantly developing the stack that is available for use, starting with the Aspen and Bamboo stacks, and moving to the current Cedar stack, which this book talks about.
Cedar is a big move forward in that it allows Heroku to become a fully polyglot platform (i.e., it can run many different types of applications within the same stack). Ruby is no longer the only option for use on Heroku, with the platform now supporting Python, Java, Node.js, Clojure, and Scala, and providing the potential for a vast amount more via the use of Heroku buildpacks, which we will talk about more later in the book.
Its probably worth mentioning the Heroku culture and how this affects its approach to software and how things are put together.
Picture the movie industry just 70 years ago. If you wanted to watch a film, it had to be what was playing at the local cinema. Hundreds of people would congregate and watch that film together, and it would be fun.
By the 1980s, the magical idea of the videocassette was taking off. Now people could choose what film to watch and when, assuming that they had access to the media. The technology was much smaller, and the media much more readily available.
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