=== Installation prerequisites

These prerequisites exist for installing the {project_name} server:

* Can run on any operating system that runs Java
* Java 8 JRE or Java 11 JRE
* zip or gzip and tar
* At least 512M of RAM
* At least 1G of diskspace
* A shared external database like PostgreSQL, MySQL, Oracle, etc.  {project_name} requires an external shared
  database if you want to run in a cluster.   Please see the <<_database,database configuration>> section of this guide for more information.
* Network multicast support on your machine if you want to run in a cluster.  {project_name} can
 be clustered without multicast, but this requires a bunch of configuration changes.  Please see
 the <<_clustering,clustering>> section of this guide for more information.
* On Linux, it is recommended to use `/dev/urandom` as a source of random data to prevent {project_name} hanging due to lack of available
  entropy, unless `/dev/random` usage is mandated by your security policy. To achieve that on Oracle JDK 8 and OpenJDK 8, set the `java.security.egd`
  system property on startup to `file:/dev/urandom`.