Redis supports both data replication and persistence, which are crucial for ensuring data integrity, availability, and durability in a distributed system.
Replication: Redis uses asynchronous replication. A master can have multiple slaves, and the data is replicated to any number of slave Redis servers. Slaves are also capable of accepting connections from other slaves. This capability allows for a variety of configurations, such as chaining different slaves or creating a tree of slaves for larger and more robust systems.
Here's how you set it up:
Persistence: Redis offers two types of persistence - RDB (Redis DataBase file) and AOF (Append Only File).
For example, to save the DB on disk (creates a dump.rdb):
To enable AOF persistence:
In production environments, it's common to combine both RDB and AOF. The decision depends on your particular use case and understanding the trade-offs between performance, durability, and speed of recovery.