The __PostgreSQL__ image in __Docker__ allows you to run and utilize __PostgreSQL__ databases within a containerized environment. __Docker__ is a platform for deploying software applications in virtual containers, providing an easy way to create, deploy, and manage containers. The __PostgreSQL__ image in __Docker__ provides a standardized way to deploy and use this __database__, as well as enabling easy scalability and management of container images.

```Dockerfile
RUN apk add postgresql-client build-base postgresql-dev
```

It's a command for the package manager of __Alpine Linux__, which is used as the base image in __Docker__.

This command adds the specified packages to the __Docker__ image during its build, so they are available inside containers based on this image.

## Other Databases

Here are similar commands for installing other databases:

For __MySQL__:
```
RUN apk add mysql-client mysql-dev
```

For __MongoDB__ (you may also need to install the libbson library):
```
RUN apk add mongodb-tools mongodb-dev libbson
```

For __SQLite__:
```
RUN apk add sqlite sqlite-dev
```

These commands will install the necessary packages for working with the respective database on __Alpine Linux__. You may also need to install other additional packages or configure the environment depending on your specific use case.

Instructions for installing these and other images can be found on __Docker Hub__.

What does the command "RUN apk add postgresql-client build-base postgresql-dev" do in Docker?

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PostgreSQL Image

Other Databases