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At this point,

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we are getting closer to the end of this module.

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We now also learned about multi-stage builds,

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and we saw how we can deploy multiple containers,

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not just on the same host,

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in the same task in ECS' case,

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but also on different hosts.

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And I'm saying host,

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because we have different domains

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for these different deployed containers.

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Now I also wanna verify

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whether everything still works correctly locally.

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With docker-compose up.

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Because that, hopefully, should still work.

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If I run this,

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and I enter localhost 3000,

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I still see my goals up there.

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And I got no goals here

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because we're using a different database in development.

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But I can add goals, and they stick around

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just in that development database.

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So that also seems to work just fine,

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and without any errors.

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Which is good, and which is of course exactly what we want.

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Now I also wanna talk about

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having different Docker files for production and development

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because at first, this might be strange.

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After all,

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one of the main reasons for using Docker

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was that we have the same environment

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in production and development.

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And I wanna emphasize that we still have that.

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Having the same environment

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does not mean that there can't be differences

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between production and development.

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In React's example,

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we need differences,

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because the code needs to be optimized.

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That's done automatically with a build script,

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but therefore we need a separate image

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that takes care about that build script

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and builds our code,

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before we serve it.

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There is no way around that,

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it's not a weakness in our setup,

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it is what we need to do

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for React projects.

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Things like using different URLs here in our React code,

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or different MONGODB database names,

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for development and production

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also are totally normal.

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This does not change the way our code works,

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and this does not change our environment.

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This is still a React app,

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and the backend is still executed with node.

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These are just differences in our code,

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which make a lot of sense.

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After all, we don't want to work on the production database

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when we're just testing our code.

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So you shouldn't make the mistake of thinking that

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just because there are some differences in code,

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or because we take care about different scenarios,

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like here with different backend URLs,

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that this would mean that all of a sudden

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we don't have that reproducibility.

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We absolutely do have it,

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because the code

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and the environment is still locked

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into an image and a container.

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And even if we have different images

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for development and production,

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as we have it here with React,

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we only have that because React forces us to do that.

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But our code is still the same.

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And React simply doesn't need any other environment tools,

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it doesn't need node just to execute the code.

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It just needs node to build the code,

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and therefore we have code,

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both in the development,

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as well as in the production environment.

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And of course we could use the exact same node version

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in both Docker files,

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if we really wanted to ensure

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that we have the exact same setup.

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So let's maybe do that here.

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That's just something I wanted to emphasize,

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because it's easy to get confused by that,

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and to think that, well,

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all of a sudden we're not using Docker's benefits anymore.

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We definitely are.