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Now, there was some use of data that we added to the MongoDB.

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We created the new database DMP, and we added new collection data called Paracels.

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And now there was a single document inside of this collection.

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Now let's try to restart all containers and see whether after a start, this data will be present here

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or not.

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Let's go to the terminal.

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Let's, first of all, Orion containers using Docker compose down command.

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It will stop all four containers, Mongo Express front and the Mongo and the EPA.

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This was done.

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No containers are being removed.

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They were removed.

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Notice that this step means complete removal of the containers and corresponding network that Doga created

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for communication between those four containers was removed as well.

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And now there are no containers, one I could enter.

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Docker be a command with option.

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This eight the stance for all and output is empty.

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There are no Niall Horan and no stopped containers recovered that before I removed.

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All previously started containers inside of the Docker desktop.

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Now let's go ahead and bring all containers up again.

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Docker compose up and let's at option deep detached and notice that this comment will now create brand

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new containers because at the moment there are no stop containers or containers were removed after Docker

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compose down command.

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Let's create brand new containers now.

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Great, and can you network because it was removed as well?

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Images gallery, the fold.

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Creating new containers for all services, Mongo API front and Mongo Express.

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All four containers away agree that let's verify that dog appeals, and here the you know, let's go

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back to Mongo Express to its graphical user interface and check whether Typekit database is present

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here or not.

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Let's simply refresh page here.

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And I see no DNA database here in this list.

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And this very reasonable list, no go to Docker compose file and there are I'll explain to you what

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actually happens right now and why we don't see any DMP database here anymore.

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Let's go here and recap that we added more on groceries like that.

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We simply specified image.

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It is more an official image and global of environment variables.

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That's it.

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And we just seen the Docker compose after bringing down all containers and bringing them up afterwards

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creates brand new containers.

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Here they are at this moment of time and all those containers that are created from scratch.

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Of course, new container IDs, new file systems, and so on.

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Everything is new and this way after Docker compose down and Docker compose up commands Mongo container.

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Here's actually initial contents of the Mongo image, and there was no custom use of data that we created

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before in the previous container because this container that we see right now is completely different

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from the container that was running before where we created DMB database.

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This very important to understand it means that now we are not persistent data in the Mongo database.

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And each time when you create new containers using Docker compose up after Docker compose down command,

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Mongo database will be created from scratch.

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But of course, if you want to process data, it's possible to achieve that.

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And for that, we could use custom volume that we will create inside of the Docker and map.

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This custom volume does a Mongo container, and let's do that after the small break.