python 操作redis集群

一、连接redis集群

python的redis库是不支持集群操作的，推荐库：redis-py-cluster，一直在维护。还有一个rediscluster库，看GitHub上已经很久没更新了。


安装

pip3 install redis-py-cluster

连接redis集群

#!/usr/bin/env python
# coding: utf-8

from rediscluster import StrictRedisCluster

class RedisCluster(object):  # 连接redis集群
    def __init__(self,conn_list):
        self.conn_list = conn_list  # 连接列表

    def connect(self):
        """
        连接redis集群
        :return: object
        """
        try:
            # 非密码连接redis集群
            # redisconn = StrictRedisCluster(startup_nodes=self.conn_list)
            # 使用密码连接redis集群
            redisconn = StrictRedisCluster(startup_nodes=self.conn_list, password='')
            return redisconn
        except Exception as e:
            print(e)
            print("错误,连接redis 集群失败")
            return False

redis_basis_conn = [{'host': '192.168.10.168', 'port': 7201}, {'host': '192.168.10.169', 'port': 7201}, {'host': '192.168.10.170', 'port': 7201}, {'host': '192.168.10.171', 'port': 7201}, {'host': '192.168.10.142', 'port': 7201}, {'host': '192.168.10.143', 'port': 7201}]

res = RedisCluster(redis_basis_conn).connect()
if not res:
    print("连接redis集群失败")
else:
    print("连接redis集群成功")

执行输出：

连接redis集群成功

二、操作redis集群

查看节点状态

#!/usr/bin/env python
# coding: utf-8

from rediscluster import StrictRedisCluster

class RedisCluster(object):  # 连接redis集群
    def __init__(self,conn_list):
        self.conn_list = conn_list  # 连接列表

    def connect(self):
        """
        连接redis集群
        :return: object
        """
        try:
            # 非密码连接redis集群
            # redisconn = StrictRedisCluster(startup_nodes=self.conn_list)
            # 使用密码连接redis集群
            redisconn = StrictRedisCluster(startup_nodes=self.conn_list, password='')
            return redisconn
        except Exception as e:
            print(e)
            print("错误,连接redis 集群失败")
            return False

    def get_state(self):
        """
        获取状态
        :return:
        """
        res = RedisCluster(self.conn_list).connect()
        # print("连接集群对象",res,type(res),res.__dict__)
        if not res:
            return False

        dic = res.cluster_info()  # 查看info信息, 返回dict

        for i in dic:  # 遍历dict
            ip = i.split(":")[0]
            if dic[i].get('cluster_state'):  # 获取状态
                print("节点状态, ip: ", ip, "value: ", dic[i].get('cluster_state'))

redis_basis_conn = [{'host': '192.168.10.168', 'port': 7201}, {'host': '192.168.10.169', 'port': 7201}, {'host': '192.168.10.170', 'port': 7201}, {'host': '192.168.10.171', 'port': 7201}, {'host': '192.168.10.142', 'port': 7201}, {'host': '192.168.10.143', 'port': 7201}]

RedisCluster(redis_basis_conn).get_state()

执行输出：

节点状态, ip:  192.168.10.171 value:  ok
节点状态, ip:  192.168.10.169 value:  ok
节点状态, ip:  192.168.10.143 value:  ok
节点状态, ip:  192.168.10.142 value:  ok
节点状态, ip:  192.168.10.170 value:  ok
节点状态, ip:  192.168.10.168 value:  ok

查看aof是否开启

#!/usr/bin/env python
# coding: utf-8

from rediscluster import StrictRedisCluster

class RedisCluster(object):  # 连接redis集群
    def __init__(self,conn_list):
        self.conn_list = conn_list  # 连接列表

    def connect(self):
        """
        连接redis集群
        :return: object
        """
        try:
            # 非密码连接redis集群
            # redisconn = StrictRedisCluster(startup_nodes=self.conn_list)
            # 使用密码连接redis集群
            redisconn = StrictRedisCluster(startup_nodes=self.conn_list, password='')
            return redisconn
        except Exception as e:
            print(e)
            print("错误,连接redis 集群失败")
            return False

    def get_info(self):
        """
        获取redis集群info信息
        :return: dict
        """
        res = RedisCluster(self.conn_list).connect()
        # print("连接集群对象",res,type(res),res.__dict__)
        if not res:
            return False

        dic = res.cluster_info()  # 查看info信息, 返回dict
        if not dic:
            return False

        return dic

    def get_state(self):
        """
        获取状态
        :return:
        """
        dic = self.get_info()  # type:dict
        if not dic:
            return dic

        for i in dic:  # 遍历dict
            ip = i.split(":")[0]
            if dic[i].get('cluster_state'):  # 获取状态
                print("节点状态, ip: ", ip, "value: ", dic[i].get('cluster_state'))

    def get_has_aof(self):
        """
        查看aof是否打开
        :return:
        """
        res = RedisCluster(self.conn_list).connect()
        # print("连接集群对象",res,type(res),res.__dict__)
        if not res:
            return False

        dic = res.config_get('appendonly')  # 从config配置项中查询appendonly

        for i in dic:
            ip = i.split(":")[0]
            # print(dic[i])
            if dic[i].get('appendonly'):
                print("aof开关, ip: ", ip,"value: ",dic[i].get('appendonly'))

redis_basis_conn = [{'host': '192.168.10.168', 'port': 7201}, {'host': '192.168.10.169', 'port': 7201}, {'host': '192.168.10.170', 'port': 7201}, {'host': '192.168.10.171', 'port': 7201}, {'host': '192.168.10.142', 'port': 7201}, {'host': '192.168.10.143', 'port': 7201}]

RedisCluster(redis_basis_conn).get_has_aof()

执行输出：

aof开关, ip:  192.168.10.170 value:  no
aof开关, ip:  192.168.10.168 value:  no
aof开关, ip:  192.168.10.142 value:  no
aof开关, ip:  192.168.10.171 value:  no
aof开关, ip:  192.168.10.169 value:  no
aof开关, ip:  192.168.10.143 value:  no

set和get

#!/usr/bin/env python
# coding: utf-8

from rediscluster import StrictRedisCluster

class RedisCluster(object):  # 连接redis集群
    def __init__(self,conn_list):
        self.conn_list = conn_list  # 连接列表

    def connect(self):
        """
        连接redis集群
        :return: object
        """
        try:
            # 非密码连接redis集群
            # redisconn = StrictRedisCluster(startup_nodes=self.conn_list)
            # 使用密码连接redis集群
            redisconn = StrictRedisCluster(startup_nodes=self.conn_list, password='')
            return redisconn
        except Exception as e:
            print(e)
            print("错误,连接redis 集群失败")
            return False

# 连接列表，注意：必须严格按照此格式来！
redis_basis_conn = [{'host': '192.168.10.168', 'port': 7201}, {'host': '192.168.10.169', 'port': 7201}, {'host': '192.168.10.170', 'port': 7201}, {'host': '192.168.10.171', 'port': 7201}, {'host': '192.168.10.142', 'port': 7201}, {'host': '192.168.10.143', 'port': 7201}]

redis_conn = RedisCluster(redis_basis_conn).connect()  # redis连接对象
redis_conn.set('name','admin')  # 插入一个值
print("name is: ", redis_conn.get('name'))  # 查询值

执行输出：

name is:  b'admin'

注意：get出来的值，是bytes类型的。

其他redis操作，比如hget，hgetall... 和redis单例模式，是一样的。

这里就不一一演示了