Settings
==============

You can find the App Settings at **System → Apps → Settings**.

.. image:: img/Apps-Settings.png
    :width: 100%
    :align: center
    :alt: General App Settings

You can change the default docker bridge settings here, please use a network that you don't need and that does not conflict with your setup.
It is not relevant for the apps but needs to be created in the system for apps to work.

**Backup** will create a nightly backup of all docker container and volumes.
It keeps the last 3 backups at /opt/docker_backups.
Please be aware of the space requirements and if the hard drive has enough space for this.
You can also run manual backups with the docker-backup.sh command in the shell.

Apps Overview
****************

We are utilizing Docker as an App Container Framework.
Apps have different building blocks.
The most important are:

    * Images
    * Volumes
    * Container

**Images** are blueprints for Containers. Each container uses a copy of the Image to run.
An image can be an operating system like Debian or a programm like Java.

**Volumes** are folders or files that are mounted inside a container.
Otherwise any data will be deleted when the Container is deleted.

**Containers** are the running enviroment for the apps. Each Container loads an Image and mounts the selcted Volumes in a
selected location. You can also specify hardware limitations, mount devices and enable networking.
It runs in a sandboxed environment and can not access the host's data.

Networking
************

Due to the way Docker configures the network, there are 2 bridges in the system:

    * docker0
    * brapp

The **docker0** is the default docker bridge and **NOT** used by VT AIR.
It needs to exist in the system though.

The **brapp** is the network bridge all containers are connected to.