The application requires installing the following components:
Scans Internet resources in accordance with traffic processing rules received from the Master server.
Allows the administrator to manage application settings through the web interface. Configured settings are sent to Worker servers.
Required for fault tolerance of server management. The server with this role regularly receives current values of application settings. If the Master server fails, the Secondary master server can take up its job to ensure fault tolerant operation of the application.
You can opt not to install a Secondary master server but in that case fault tolerance is not ensured.
If the Secondary master server is not installed, and the Master server fails, you will have to reinstall the application. Application settings on Worker servers will be lost. If you have a configuration file you exported before, you can import application settings after reinstalling.
After components are installed, you need to combine all servers into a cluster for management through the application web interface.