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PostgreSQL#

PostgreSQL is the core database system used by DMB to store metadata and internal configuration for services like Riven, Zilean, and pgAdmin.

It is pre-installed and automatically initialized during container startup.

⚙️ Configuration Settings in dmb_config.json#

"postgres": {
  "enabled": false,
  "process_name": "PostgreSQL",
  "suppress_logging": false,
  "log_level": "INFO",
  "host": "127.0.0.1",
  "port": 5432,
  "shared_buffers": "128MB",
  "max_connections": 100,
  "databases": [
    { "name": "postgres", "enabled": true },
    { "name": "pgadmin", "enabled": true },
    { "name": "zilean", "enabled": true },
    { "name": "riven", "enabled": true }
  ],
  "config_dir": "/postgres_data",
  "config_file": "/postgres_data/postgresql.conf",
  "initdb_args": "--data-checksums",
  "user": "DMB",
  "password": "postgres",
  "shared_buffers": "128MB",
  "max_connections": 100,
  "run_directory": "/run/postgresql",
  "command": "postgres -D {postgres_config_dir} -c config_file={postgres_config_file}",
  "env": {}
},

🔍 Configuration Key Descriptions#

  • enabled: Whether to start the PostgreSQL service.
  • process_name: The label used in logs and process tracking.
  • suppress_logging: If true, disables log output for this service.
  • log_level: Logging verbosity level (e.g., DEBUG, INFO).
  • host: IP address for PostgreSQL to listen on.
  • port: Port exposed for the PostgreSQL server.
  • shared_buffers – Amount of memory allocated to PostgreSQL.
  • max_connections – Maximum simultaneous database connections.
  • databases – List of databases to initialize, with each entry containing:
    • name – Name of the database.
    • enabled – Whether this database should be created.
  • config_dir – Directory where PostgreSQL configuration files are stored.
  • config_file – Path to the primary PostgreSQL configuration file.
  • initdb_args – Additional arguments passed to initdb during database initialization.
  • user/password – Default database credentials.
  • run_directory – Directory where PostgreSQL runtime files (like sockets) are stored.
  • command – The command used to start PostgreSQL.
  • env – Dictionary of environment variables passed to the process.

🚪 Access & Credentials#

  • Default Port: 5432
  • Default User: DMB
  • Default Password: postgres
  • Default Databases:
    • postgres
    • pgadmin
    • zilean
    • riven

🔐 Override any of the above using POSTGRES_USER, POSTGRES_PASSWORD, or POSTGRES_DB environment variables.

📁 Data & Config Paths#

Purpose Path
Data Directory /postgres_data
Config File /postgres_data/postgresql.conf
Runtime Directory /run/postgresql

🧠 Useful Commands#

📦 Run SQL Command Directly (one-liner)#

docker exec -it DMB psql -U DMB -d riven -c 'SELECT COUNT(*) FROM media;'

🧭 Enter the Container & PostgreSQL Shell#

docker exec -it DMB /bin/bash
psql -U DMB -d riven

🗑️ Drop the Riven Database#

This will permanently delete the Riven database. Be sure you’ve backed up anything important.

From the host (one-liner): 

docker exec -it DMB psql -U DMB -c 'DROP DATABASE riven;'

From inside the container: 

docker exec -it DMB /bin/bash
psql -U DMB
DROP DATABASE riven;

🧠 Tips#

  • Always restart the container after modifying config files in /postgres_data.
  • Ensure you mount /postgres_data if you want persistent databases.
  • pgAdmin is the easiest way to visually explore and manage PostgreSQL.

📚 More Info#