In order to use Docker you first need to install it. Docker therefore allows you to automate the deployment of applications in these containers.Įnough theory, let's jump into installing Docker and firing up a Postgres database. Whilst when you install Docker, you are going to use the Docker Engine to create isolated entities on the OS. Therefore, the big difference between VMs and Docker containers is that the former can have multiple (Guest) Operating Systems on the same hardware, through for example VMWare (which is called a Hypervisor). In a VM you can have multiple Operating Systems running on the same hardware, whilst with Docker you virtualise the Operating System. Docker doesn't do that and does it differently. What these cloud environments are doing is 'virtualise' the hardware. Whenever you create a VM you are sharing the hardware with others and other VMs. The latter often runs in cloud environments like AWS and Azure. With Docker, you can manage your infrastructure in the same ways you manage your applications."įor fully understanding Docker we also need to talk about the difference between Docker and a Virtual Machine (VM). Docker enables you to separate your applications from your infrastructure so you can deliver software quickly. Along the way you also learn some Docker specific lingo.Īccording to the official docs, Docker is and " open platform for developing, shipping, and running applications. Have you ever had the problem where a tool or a piece of software works fine on your machine, but the moment you install it on someone else's you get all kinds of issues? Well, I have, and particularly for this reason Docker was invented! In this blog post we will take a quick look at what Docker is and how easy it is to run a database in a Docker container.
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