Scylla Manager is a product for database operations automation. It can manage multiple Scylla clusters and run cluster-wide tasks in a controlled and predictable way. Scylla Manager discovers cluster topology and is aware of nodes belonging to different datacenters.
Scylla Manager consists of three components:
Server - a daemon that exposes REST API
sctool - a command-line interface (CLI) for interacting with the Server over the REST API
Agent - a small executable, installed on each Scylla node. The Server communicates with the Agent over REST HTTPS. The Agent communicates with the local Scylla node over the REST HTTP.
The Server persists its data to a Scylla cluster which can run locally or can run on an external cluster (see Use a remote database for Scylla Manager for details).
Optionally (but recommended), you can add Scylla Monitoring Stack to enable reporting of Scylla Manager metrics and alerts.
The diagram below presents a logical view of Scylla Manager with a remote backend datastore managing multiple Scylla Clusters situated in datacenters.
Each node has two connections with the Scylla Manager Server:
REST API connection - used for Scylla Manager and Scylla Manager Agent activities
CQL connection - used for the Scylla Health Check