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Now, to demonstrate what I was talking about

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and to show you these different kinds of data and action.

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I prepared another project for you,

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which we're going to dockerize and what you find attached

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to this lecture as a subfile.

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It's another note JS example

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and its generally a simple application.

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In my node server, I have a couple of routes

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a couple of supported requests,

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you could say, which I wanna handle.

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And if you would run this application

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which we're going to do later,

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you would be presented with this form

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which allows you to enter some feedback.

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And as part of the application when feedback is submitted,

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that feedback is stored in a file.

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To be precise it's stored in two files.

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A temporary file, which is stored in a temporary file path.

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Then I check whether that file already exists

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in the final path where I wanna store it ultimately.

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And then if it does not exist yet,

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I'm going to copy the temporary file

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over to the final file path.

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And the generated file simply contains the feedback

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that was submitted.

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This is what this application does,

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with some node express code.

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And besides this server chase file

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we got a couple of folders here.

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We got the pagers folder with some HTML pages,

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which are being sent back by the server JS file.

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So I'm sending this HTML pagers

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for different incoming requests.

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The feedback HTML file contains the form

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so this screen here, for example.

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And then we get the public folder with the styles file

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which is being hosted.

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But then more importantly we got the temp

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and the feedback folders which are empty initially.

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And the idea behind these folders

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is that the temp folder will store

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the temporary generated file with the feedback

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until we checked whether the file already exists

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in the feedback folder,

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and if the file does not exist yet

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it's going to be copied over.

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This is what this application does.

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And I created this application,

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because in this app we can't see all three kinds of data

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in action

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We got our application ofcourse, so the source code,

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we got temporary data,

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what we are going to store in the temp folder.

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for example, files which we are going to store

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which we're okay with losing.

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And we got permanent storage,

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that will be the files that will end up

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in the feedback folder in the end.

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So, we have all three kinds of data here

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and we're going to dockerize this up

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so that we see which problems we're facing at the moment.

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And then we are going to solve these problems

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with a couple of tools docker gives us