# Pre-installation steps

As a DCE subscriber, Sonar will assist with the setup and configuration of your cluster. Get in touch with your account manager to receive appropriate onboarding resources.

## Generating a JWT token <a href="#jwt-token" id="jwt-token"></a>

To keep user sessions alive during a restart, you will need to generate a JWT token that will be stored in each application node. See [jwt-token](https://docs.sonarsource.com/sonarqube-server/server-installation/pre-installation/jwt-token "mention").

## Configuring the search nodes to comply with Elasticsearch <a href="#configuring-search-nodes" id="configuring-search-nodes"></a>

Because SonarQube Server uses an embedded Elasticsearch, make sure that the configuration of your search nodes complies with the [Elasticsearch production mode requirements](https://www.elastic.co/guide/en/elasticsearch/reference/current/docker.html#docker-prod-prerequisites) and [File Descriptors configuration](https://www.elastic.co/guide/en/elasticsearch/reference/current/file-descriptors.html). See the corresponding page:

* [linux](https://docs.sonarsource.com/sonarqube-server/server-installation/pre-installation/linux "mention")
* [macos](https://docs.sonarsource.com/sonarqube-server/server-installation/pre-installation/macos "mention")

## Various settings <a href="#various-settings" id="various-settings"></a>

You may have to perform additional steps on the cluster nodes depending on your environment. See:

* [linux](https://docs.sonarsource.com/sonarqube-server/server-installation/pre-installation/linux "mention")
* [unix](https://docs.sonarsource.com/sonarqube-server/server-installation/pre-installation/unix "mention")

## Related pages <a href="#related-pages" id="related-pages"></a>

* [dce-topology](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/dce-topology "mention")
* [installation-requirements](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/installation-requirements "mention")
* [from-zip-file](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/from-zip-file "mention")
* [on-kubernetes-or-openshift](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/on-kubernetes-or-openshift "mention")
* **Configuring network security features:**
  * [securing-behind-proxy](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/network-security/securing-behind-proxy "mention")
  * [elasticsearch-security-features](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/network-security/elasticsearch-security-features "mention")
  * [network-rules](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/network-security/network-rules "mention")
* [starting-stopping-cluster](https://docs.sonarsource.com/sonarqube-server/server-installation/data-center-edition/starting-stopping-cluster "mention")