This section describes the dependencies related to the Qlik Sense services (for example, dependencies on the operating system and other software).
Repository database
The Qlik Sense Repository Service (QRS) connects to the repository database to store and retrieve data necessary for the Qlik Sense services on the node on which the QRS is running. In a default Qlik Sense installation, the Qlik Sense Repository Service (QRS) uses the Qlik Sense Repository Database (QRD) service to read and write data in the repository database. A PostgreSQL database is used by default.
File system
The file system stores the binary files for the Qlik Sense apps.
Directory service
The QRS and Qlik Sense Proxy Service (QPS) communicate with a configured directory service (for example, Microsoft Active Directory) using, for example, LDAP or ODBC.
Start and restart of services
Normally, the Qlik Sense services are started automatically on a node.
Start-up behavior
The Qlik Sense Repository Database (QRD) and Qlik Sense Repository Service (QRS) are started first.
When another service is started, it contacts its local QRS to get configuration parameters. If the service is not (yet) configured to run, it periodically checks back with the local QRS.
Manual start
If the services are started manually, make sure to start them in the following order:
- Qlik Sense Repository Database (QRD)
- Qlik Sense Repository Service (QRS)
- Qlik Sense Proxy Service (QPS), Qlik Sense Engine Service (QES), Qlik Sense Scheduler Service (QSS), Qlik Sense Printing Service (QPR), and Qlik Sense Service Dispatcher (QSD) in no specific order
The order is important because the QRS is dependent on the QRD and the rest of the services are dependent on the QRS.