# 2. Familiarize yourself with the Toolkit

## Taking a look around <a href="#taking-a-look-around" id="taking-a-look-around"></a>

Now that we have a local copy of the Toolkit, let's take a look at the structure of the repository using the `ls` command:

```bash
ls -l
```

{% hint style="info" %}
The `ls -l` command displays a detailed long listing view of the contents of a directory, providing additional file information such as permissions, ownership and size.
{% endhint %}

If everything was cloned successfully you should see something like this:

```bash
drwxr-xr-x 3 fry fry  4096 Aug 30 14:16 bin
-rw-r--r-- 1 fry fry  6465 Aug 30 14:16 CHANGELOG.md
drwxr-xr-x 2 fry fry  4096 Sep  6 12:43 config
drwxr-xr-x 5 fry fry  4096 Aug 30 14:22 data
drwxr-xr-x 3 fry fry  4096 Aug 30 14:16 doc
drwxr-xr-x 3 fry fry  4096 Aug 30 14:16 lib
-rw-r--r-- 1 fry fry 34520 Aug 30 14:16 LICENSE
-rw-r--r-- 1 fry fry  1178 Aug 30 14:16 README.md
```

{% hint style="info" %}
All user-owned configuration files are found in the `config/` directory. This directory is **excluded** from the git revision control system, so it will not be changed by updating the Toolkit.
{% endhint %}

| Name     | Description                                                                                                                                                                                                                         |
| -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `bin`    | This folder contains a collection of scripts that help you manage your Overleaf server instance. You can read more about these scripts in our Commands section below.                                                               |
| `config` | This folder contains your own local configuration files.                                                                                                                                                                            |
| `lib`    | This folder contains base configuration files used by the Toolkit.                                                                                                                                                                  |
| `data`   | By default this folder contains the storage location for MongoDb, Redis and Overleaf. For more information see [Persistent data](/on-premises/configuration/overleaf-toolkit/files-and-locations.md#persistent-data) section below. |

{% hint style="warning" %}
We recommend **not** changing files outside of the `/config` folder directly. Instead, if you need to make changes, they can be done via environment variables set in either **config/variables.env** or **config/overleaf.rc.** For example, to set the **mongo** service image, rather than manually editing **lib/docker-compose.mongo.yml** file, you can set the image using the environment variable `MONGO_IMAGE` in **config/overleaf.rc.** For more information see the [Toolkit settings](/on-premises/configuration/overleaf-toolkit/toolkit-settings.md) page.
{% endhint %}

{% hint style="info" %}
The Toolkit will **not** change any data in the `config/` directory without your permission.
{% endhint %}


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