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If we look at any computer system, we can see that there is always a hardware architecture organized
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around the motherboard.
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The processor is the central point of this motherboard and depending on its type, it will use different
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instructions.
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For example, in tablets and phones, ARM processors are often used.
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This is also the one used on the famous RaspberryPi computer.
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In PCs and Macs, we have x86 architecture processors, so they execute other instructions to run programs.
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Once we've chosen our processor, we install an operating system.
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It will be the interface between the user application and the hardware. And all of us, depending on
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our affinities, we will use Windows, Linux or Mac OS.
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Each time we want to install an application, it will require a certain numbers of libraries and dependencies
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and to make this application works properly, we have to be sure that these libraries and dependencies
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are present on the system before the installation process.
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The problem is that libraries dependencies on the application themselves are specific for an operating
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system and specific for process type.
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That means that when we want to install something, we end up by looking for the right binaries and
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associated libraries, and often we're guided by complicated tutorials.
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But the other thing is that often when we install libraries for one application, it's possible that
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the new installation corrupt the previous one which was properly working.
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So we need to simplify the installation process by providing a complete separated environment for each
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of our application.
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We want something independent of the processor type and independent of the operating system we're working
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on.
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And that's where Docker comes in, because it's going to manage this interface between the system and
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the applications. In the end,
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the only difficulty is to install Docker with installation processes, of course, dependent on each
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environment.
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Fortunately, it's very well explained in the official documentation.
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We'll install it together on Windows and make a small demonstration.
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It's called Docker Desktop.
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It's also available for Linux and Mac OS.
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Later in this course, I will also use it on a remote server, so I will also install it on my public
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Linux server.
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So to install Docker on Windows, we just need to download the latest version on the Docker website and
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to follow the steps.
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There is nothing special about this installation.
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Now let's use it to launch new services on our computer.
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Of course, if you've installed Docker on a remote server then these services will be launch on the
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remote server once the installation is finished.
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If there is no container running on Docker Desktop, it proposes to test one called Docker
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Getting started.
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We just pick up the command to run it in our terminal.
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On the left we've got a MobaXTerm terminal and on the right we have Docker desktop running.
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We'll use the terminal to launch our container and we'll use Docker Desktop to manage them.
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I just need to execute the command I've copied previously.
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And when everything has been downloaded, I can see that a new container has been created on my Docker
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Desktop interface.
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I can now play with it.
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This "getting started" container has created a web service on my computer.
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We can connect to it thanks to any web browser.
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There we go.
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This is our new local website on which there is many useful information, by the way.
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Great.
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That was the Docker installation and our local Windows machine. For your Linux local machine,
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Docker Desktop is also available, so no worries.
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Now remember that during this lecture I will also often use a public Linux server without user interface.
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So I also set up Docker and Docker compose on my server, but I'm not going to show you the process
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because it would be different depending on your Linux distribution.
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So please refer to the documentation for that.
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Good.
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So now that we have Docker and Docker compose ready, we will use it many times during this lecture,
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that will make all installation process very easy.