Persistent key-value database.

# To start Redis server, using the default port, as a background process:
redis-server --daemonize yes

# To start Redis server, using the specified port, as a background process:
redis-server --port <port> --daemonize yes

# To start Redis server with a custom configuration file:
redis-server <path/to/redis.conf>

# To start Redis server with verbose logging:
redis-server --loglevel <warning|notice|verbose|debug>