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Now did we know compose

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and we started building

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at least a little bit bigger applications

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and we know how to work with multiple containers.

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I wanna dig a bit deeper

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into what you can do with Dockers and containers.

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And I specifically wanna have a look at a concept

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which I like to call "utility containers."

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Now that's not an official term,

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utility containers is not an official term.

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It's just a term I like to use and after this module

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you will know why I like to use it.

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Because here's what I mean with utility containers..

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Up to this point in all examples and all sections,

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we always worked with application containers

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that were Docker containers

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that contained our application, our application code

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and the environment we need to execute this application.

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And don't get me wrong,

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this is the primary selling point of Docker.

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This is one of the primary reasons of using Docker

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and it is the core idea behind Docker.

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So this is absolutely the most important thing with Docker.

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And the idea here was simple.

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We build our own Docker file,

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and then when we ran Docker run

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maybe with some extra options

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or with help off Docker compose

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this command in the darker file get executed,

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and our note API or react single page application

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or database started up.

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That is what we did this far.

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And again, that is the most important part of Docker

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that is what a Docker is all about.

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But this does not mean

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that we cannot leverage Docker for other things as well.

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And that is where utility containers come into play.

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With utility containers,

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I in the end mean containers

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which only have a certain environment in them.

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Let's say a node JS environment or a PHP environment

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something like that.

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And the idea here is that they don't start an application

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when you run them,

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but instead you run them in conjunction

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with some command specified by you

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to then execute a certain task.

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And this is a syntax we haven't seen this far.

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It's a syntax we haven't used this far.

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Adding an extra command after the image name

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when starting a container.

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But it is something we're going to have a closer look at

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in this module because this is something where

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Docker is also able to shine.