集群介绍

https://www.cnblogs.com/theboy/p/10690838.html

方法一、第三方包实现

参考文档：
https://redis-py-cluster.readthedocs.io/en/master/
参考rep:
https://github.com/Grokzen/redis-py-cluster

>>> from rediscluster import RedisCluster

>>> # Requires at least one node for cluster discovery. Multiple nodes is recommended.
>>> startup_nodes = [{"host": "127.0.0.1", "port": "7000"}, {"host": "127.0.0.1", "port": "7001"}]
>>> rc = RedisCluster(startup_nodes=startup_nodes, decode_responses=True)

# Or you can use the simpler format of providing one node same way as with a Redis() instance
<<< rc = RedisCluster(host="127.0.0.1", port=7000, decode_responses=True)

>>> rc.set("foo", "bar")
True
>>> print(rc.get("foo"))
'bar'

方法二、自带官方包已经支持

参考repo:https://github.com/andymccurdy/redis-py
参考文档：https://redis.io/topics/cluster-tutorial

Using 'host' and 'port' arguments:
>>> from redis.cluster import RedisCluster as Redis
>>> rc = Redis(host='localhost', port=6379)
>>> print(rc.get_nodes())
    [[host=127.0.0.1,port=6379,name=127.0.0.1:6379,server_type=primary,redis_connection=Redis<ConnectionPool<Connection<host=127.0.0.1,port=6379,db=0>>>], [host=127.0.0.1,port=6378,name=127.0.0.1:6378,server_type=primary,redis_connection=Redis<ConnectionPool<Connection<host=127.0.0.1,port=6378,db=0>>>], [host=127.0.0.1,port=6377,name=127.0.0.1:6377,server_type=replica,redis_connection=Redis<ConnectionPool<Connection<host=127.0.0.1,port=6377,db=0>>>]]
Using the Redis URL specification:
>>> from redis.cluster import RedisCluster as Redis
>>> rc = Redis.from_url("redis://localhost:6379/0")
Directly, via the ClusterNode class:
>>> from redis.cluster import RedisCluster as Redis
>>> from redis.cluster import ClusterNode
>>> nodes = [ClusterNode('localhost', 6379), ClusterNode('localhost', 6378)]
>>> rc = Redis(startup_nodes=nodes)