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Because of its high flexibility and customization power, OpenShift can be used to create specialized tasks for the application being hosted on it. For example, an entire array of dynos (also known as gears) can be dedicated to media transcoding in order to build a custom media converter infrastructure. See More
Openshift uses the PaaS instance/dyno model. It allows developers to deploy their code to a specified number of dynos. Each of these dynos is pre-configured to run a piece of the application that is hosted on them. For example, some of them can access the database, others can respond to HTTP requests or process background processes. Developers can define their processes and assign them a different task, this gives them granular control over their hosting service and performance of the application. See More
While starting with Heroku is fast and easy, and the first few deployments are actually very fast, larger applications tend to have slower deployments. It takes some time for the dynos to restart and while they are restarting the application is completely offline. Which means that you can lose precious seconds of application time. See More
Heroku has a vast list of plugins and services that can be added to an instance. These plugins cover things from databases to email systems. This remove the task of having to install services and setting them up manually. Heroku does it all for you. See More
Getting started with Heroku is very easy. It's a very straightforward procedure and a beginner can set up their first app in two minutes. Often it's just a matter of a couple of git commands and it's all set up and running. The official Heroku docmentation also helps a lot. See More