# System Requirements

## Hardware Requirements
* Any modern x86_64 or equivalent server or PC
* Memory requirements depend on usage. We recommend starting with a minimum of
2 GB of memory.
* Storage requirements depend on usage. We recommend starting with a minimum of
20 GB of storage.

## TLS Certificate
GRADIUS web application can run on HTTP or HTTPS. We recommend using HTTPS. To
run the application on HTTPS, you have to provide the path to the certificate
fullchain and key files during the installation.

## DNS
Although the application can work without a domain name, we recommend using a
dedicated domain. The domain could be something like:
`gradius.example.com`. Typically, the application is hosted inside the
organization's network. So, we expect you to have a DNS system in place using which
the network administrator's computers can resolve the name to the designated IP
address.

## Email
GRADIUS can send emails to users. In order for the emails to reach the recipient,
a functioning SMTP server is required. It could be an SMTP smarthost or a real SMTP server running on premise or elsewhere.

## SMS/Text Messages
GRADIUS can send text messages to user's mobile devices. To enable this feature,
you have to provide access to an SMS gateway.