Question: How can one configure a Redis cluster?


To configure a Redis cluster, you need to follow several steps. The configuration involves setting up multiple Redis nodes and modifying configuration files with specific settings.

Let's go through these steps:

  1. Install Redis: Make sure to have Redis installed on all machines that will serve as nodes in the cluster.

  2. Configure redis.conf file: On each node, modify the redis.conf file. Uncomment (or add) and set the cluster-enabled option to yes, and specify the cluster-config-file and cluster-node-timeout. Here is an example:

    cluster-enabled yes cluster-config-file nodes.conf cluster-node-timeout 5000

    The nodes.conf file, specified by cluster-config-file, will be created automatically in the same directory as your redis.conf file. The cluster-node-timeout is the maximum amount of time in milliseconds a node can be unreachable before considered as failing.

  3. Start the Redis instances: Now start the Redis server on each of the nodes using the redis.conf configuration.

    redis-server /path/to/your/redis.conf
  4. Create the cluster: Once you have all Redis servers running, use the redis-cli tool to create a new cluster. Use the --cluster create command followed by the IP address and port number of each of your nodes. For example:

    redis-cli --cluster create

    Then, follow the instructions provided by the redis-cli tool. Usually, it suggests a configuration of slots among the nodes and asks for confirmation.

  5. Test the cluster: You can use the redis-cli tool to interact with your cluster and check if everything is working correctly. The --cluster check command gives a summary of the cluster:

    redis-cli --cluster check

By following these steps, you should have a functioning Redis cluster that can handle failovers and provide high availability. Note that this is a basic configuration, and for production environments, additional settings and considerations might be required, such as data persistence and security settings.

Was this content helpful?

White Paper

Free System Design on AWS E-Book

Download this early release of O'Reilly's latest cloud infrastructure e-book: System Design on AWS.

Free System Design on AWS E-Book

Start building today

Dragonfly is fully compatible with the Redis ecosystem and requires no code changes to implement.