Explain Redis replication setup and best practices.

Redis replication provides data redundancy and read scaling: **Master Configuration:** # redis-master.conf bind 192.168.1.100 port 6379 requirepass master_password masterauth master_password repl-diskless-sync no repl-ping-replica-period 10 **Replica Configuration:** # redis-replica.conf bind 192.168.1.101 port 6379 replicaof 192.168.1.100 6379 masterauth master_password requirepass replica_password replica-read-only yes **Dynamic Replication:** # Make server a replica REPLICAOF 192.168.1.100 6379 CONFIG SET masterauth master_password # Stop replication REPLICAOF NO ONE # Check replication status INFO replication **Python Client with Read/Write Splitting:** class RedisCluster: def __init__(self, master_host, replica_hosts, password): self.master = redis.Redis(host=master_host, password=password) self.replicas = [redis.Redis(host=h, password=password) for h in replica_hosts] self.replica_index = 0 def write(self, key, value, **kwargs): return self.master.set(key, value, **kwargs) def read(self, key): if not self.replicas: return self.master.get(key) replica = self.replicas[self.replica_index] self.replica_index = (self.replica_index + 1) % len(self.replicas) try: return replica.get(key) except redis.ConnectionError: return self.master.get(key) **Best Practices:** • Use dedicated network for replication • Configure appropriate timeouts • Monitor replication lag • Use diskless replication for fast networks • Test failover scenarios regularly