How to use the command redis-server (with examples)
Redis is a popular open-source in-memory data structure store used as a database, cache, and message broker. The redis-server command is used to start the Redis server.
Use case 1: Start Redis server with default configuration
Code:
redis-server
Motivation:
Starting Redis server with default configuration is useful when you want to quickly start a Redis server with default settings. This is often convenient in development or testing environments.
Explanation:
Running redis-server without any arguments starts the Redis server with the default configuration file, using the default port 6379. The logs are written to the standard output.
Example output:
...
[1402878] 01 Jan 00:00:00.000 # Redis version=6.2.5, bits=64, commit=00000000, modified=0, pid=1402878, just started
[1402878] 01 Jan 00:00:00.000 # Configuration loaded
...
Use case 2: Start Redis server as a background process
Code:
redis-server --daemonize yes
Motivation:
Starting Redis server as a background process is useful in production environments where you want the server to run continuously in the background without blocking the current shell session.
Explanation:
The --daemonize option with a value of yes is used to start Redis as a background process. This allows the Redis server to run independently of the current shell session.
Example output:
[1402878] 01 Jan 00:00:00.000 # Background saving started by pid 1402880
Use case 3: Start Redis server with a specified port
Code:
redis-server --port <port> --daemonize yes
Motivation:
Starting Redis server with a specified port is useful when the default port 6379 is already in use, or when you want to run Redis server on a specific port for any other reason.
Explanation:
The --port option followed by the desired port number is used to start Redis server with a specific port. The --daemonize yes option is used to run Redis as a background process.
Example output:
[1402878] 01 Jan 00:00:00.000 # Server started, Redis version=6.2.5
[1402878] 01 Jan 00:00:00.000 * The server is now ready to accept connections on port 6380
Use case 4: Start Redis server with a custom configuration file
Code:
redis-server path/to/redis.conf
Motivation:
Starting Redis server with a custom configuration file is useful when you want to use a non-default configuration for Redis. This allows you to customize various Redis settings such as memory limits, persistence, or network options.
Explanation:
The path/to/redis.conf argument specifies the path to a custom Redis configuration file. The Redis server will start using the settings defined in the configuration file.
Example output:
...
[1402878] 01 Jan 00:00:00.000 # Configuration loaded
[1402878] 01 Jan 00:00:00.000 # Server started, Redis version=6.2.5
...
Use case 5: Start Redis server with verbose logging
Code:
redis-server --loglevel verbose
Motivation:
Starting Redis server with verbose logging is useful when you want to see detailed log messages for troubleshooting or debugging purposes.
Explanation:
The --loglevel option followed by warning, notice, verbose, or debug is used to set the verbosity level of Redis server log messages. In this case, we set it to verbose to enable more detailed logging.
Example output:
[1402878] 01 Jan 00:00:00.000 * Reading configuration from 'redis.conf'
[1402878] 01 Jan 00:00:00.000 * Option: 'port' -> '6379'
[1402878] 01 Jan 00:00:00.000 # Server started, Redis version=6.2.5
...
Conclusion
The redis-server command provides a versatile way to start a Redis server with different configurations and logging options. Whether you need a quick start with default settings or want to customize Redis based on your specific needs, the redis-server command offers flexibility and control.
