Database Instance or simply Instance models after a single database server accessed via a host:port address or a primary/replica cluster. A typical database instance could be your on-premises MySQL instance, a PostgreSQL cluster, an AWS RDS instance etc. Each Database Instance belongs to an Environment.
If you choose to use sample data during onboarding, Bytebase will start two embedded sample PostgreSQL instances accessible from /tmp:8083 and /tmp:8084.
Go to Instances and Add Instance.For Host or socket, the screenshot assumes you run Bytebase inside Docker and try to connect to a database instance on the same host, thus it uses host.docker.internal. Check out Instance Connection Configuration for the detailed guide.