ntopng (Enterprise M/L license is required) integrates with ClickHouse to store historical flows and alerts. ClickHouse is an high-performance SQL database. To install ClickHouse refer to the official guide.
Please make sure that ClickHouse version 22 or newer is installed. Older versions are not supported as they lack important features such as the MySQL compatibiity layer.
The ClickHouse database can be executed anywhere, both locally on the machine running ntopng or on a remote machine. However,
clickhouse-client must always be installed locally as it is used by ntopng to connect to ClickHouse. This installation guide explains how to install it.