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How does mutual TLS authentication differ from standard one way TLS, and why would you enable it for Redis? How do you configure a Redis client application, such as one using the redis-py library, to connect over TLS? What is the role of certificate expiration monitoring in maintaining a secure, always available Redis deployment? What performance considerations should you keep in mind when enabling TLS on a high throughput Redis deployment?
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How do you enable TLS encryption for internal replication and cluster bus traffic between Redis nodes, not just for client connections?

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Answer

You enable the tls-replication and tls-cluster configuration options, which apply the same certificate based encryption to the traffic exchanged between master and replica nodes or between cluster members, ensuring that internal data synchronization traffic is protected just as thoroughly as traffic coming from external clients.
tls-replication yes
tls-cluster yes
tls-port 6379
port 0
Real-world example A multi region Redis Cluster deployment enables TLS for both client connections and internal replication traffic, ensuring that data replicated between data centers over the public internet remains fully encrypted.

Common follow-ups: Does enabling cluster TLS require every node in the cluster to have matching certificate configuration?;What is the performance impact of encrypting internal cluster gossip traffic?

Clustering;Redis Replication
All 7 TLS & Encryption in Redis questions