> ## Documentation Index
> Fetch the complete documentation index at: https://coollabstechnologiesbt.mintlify.site/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Databases

> Here you can find the documentation for databases in Coolify.

You can configure a database with a simple click. Coolify supports the following databases:

* PostgreSQL
* MySQL
* MariaDB
* MongoDB
* Redis
* DragonFly
* KeyDB
* Clickhouse

## Ports Mapping vs Public Port

### Ports Mapping

Ports mapping is using the Docker [port mapping](https://docs.docker.com/network/#published-ports) feature. It is used to map the container port to the host port. For example, if you set the port mapping to `8080:80`, the container port `80` will be mapped to the host port `8080`.

### Public Port

Public port is used to expose the container port to the internet, by starting an Nginx TCP proxy.

### Which one should I use?

* Port mappings makes the connection/port permanent (you need to restart your database to change it).
* The public port makes the connection/port dynamic (you can change it without restarting the database, Coolify will restart the Nginx TCP proxy for you).

## Access database during builds

If you are using `Nixpacks` build pack, you have two ways to access your database during builds:

1. Database & your application are `in the same network`: You can reach it using the `internal URL` provided by Coolify.
2. Database & your application `are not in the same network`: You need to set your database to be `Accessible over the internet` and use the `public URL` provided by Coolify.