this post was submitted on 03 Aug 2023
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If I understood correctly, Docker is a software to maintain containers. Containers are ready to go images that can run on top of your base os, like virtualisation but in a more direct way, for exemple by sharing the kernel with the os, making it lighter and way more efficient than full virtualisation
So like an App Store for programmers…?
No, not really. Containers are sort of like tiny virtual machines that run one program. Under the hood, it's different from that, but for simplicity's sake, let's just leave it at that. With this analogy, Docker would be like VMWare's software. You can use it to start and stop containers, see what containers are running, run a shell on them, etc. Docker provides the infrastructure for containers to communicate with each other, the host OS and mounted storage volumes. The one feature it has that is sort of like an app store is that it can be used to pull container images. But you need to provide the URI for that yourself. You can't just browse images as far as I know, which I think would be an integral feature of an app store. Docker Hub is a web page that allows you to browse images, and you can copy the URI from there into your CLI to have Docker pull the image.