PostgreSQL default password & login
Object-relational database. On Debian/Ubuntu the postgres user has NO password; on Docker images password is set via POSTGRES_PASSWORD env.
Use these credentials for the very first login to PostgreSQL only. The full vendor documentation linked below explains how to rotate them and harden the install.
Notes & recovery
Default auth is "peer" (Linux user) or "ident". Change with ALTER USER postgres PASSWORD 'new';
Official documentation →Change the default immediately
Anyone with internet access can try the published default on PostgreSQL. Set a strong, unique password the moment you finish first-time setup, ideally before exposing the service to your LAN.
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