# Launching Screena Portal backend

{% hint style="info" %}
Please follow the steps to install Screena Portal in this order:

1. [Preparing your system](/resources/how-to/install-screena-portal/preparing-your-system.md)
2. [Installing Screena Portal backend](/resources/how-to/install-screena-portal/installing-screena-portal-backend.md)
3. [**Launching Screena Portal backend**](/resources/how-to/install-screena-portal/launching-screena-portal-backend.md) **(you are here)**
4. [Installing the web server](/resources/how-to/install-screena-portal/installing-the-web-server.md)
5. [Configuring Screena Portal](/resources/how-to/install-screena-portal/configuring-screena-portal.md)
   {% endhint %}

Open a terminal or command prompt and navigate to the `<Screena portal home>` directory. Run the following command:

{% code overflow="wrap" %}

```shell
nohup java -Xms2048m -Xmx4096m -Dproperties.path=<Screena portal home> -Dfile.encoding=UTF-8 -Djasypt.encryptor.password=screena -jar screena-portal-1.0-spring-boot.jar & < /dev/null
```

{% endcode %}

{% hint style="info" %}

* At first launch, all the database collections with their associated indexes will be created, including the default admin user.
* The apigw\.pid file will contain the process number.
  {% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://help.screena.ai/resources/how-to/install-screena-portal/launching-screena-portal-backend.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.