PostgreSQL

Default Credentials

Variable	Value
POSTGRES_USER	postgres
POSTGRES_PASSWORD	postgres

Connection

From inside a project container (using the network alias):

psql -h postgres -U postgres

From the host machine (via the exposed port):

psql -h 127.0.0.1 -p 5432 -U postgres

Automatic DATABASE_URL

When a project’s docker-compose.yml contains a postgres service, dde automatically injects a DATABASE_URL environment variable into the primary service. The database name is derived from the project name (hyphens replaced with underscores).

The variable is only added if:

• It is not already defined in the service’s environment
• It is not defined in the project’s .env or .env.dev files

Data Persistence

Data survives container restarts and dde updates. Each version has its own isolated data directory.

Configuration

Declare in .dde/config.yml:

services:
  - name: postgres

Or with an explicit version:

services:
  - name: postgres
    version: "15"

See custom-versions.md for details on running non-default versions.