redis sentinel 客户端

1.  报错问题

sentinel客户端

调用master = sentinel.discover_master('mymaster')时报错

 

  File "D:MyDevpython36libsite-packages edisconnection.py", line 629, in read_response

    raise response

redis.exceptions.ResponseError: DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions: 1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server. 3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside.

 

命令测试

[root@s21 ~]# redis-cli -h 192.168.1.20 -p 26379         

192.168.1.20:26379>

192.168.1.20:26379> ping

(error) DENIED Redis is running in protected mode because protected mode is enabled, no bind address was specified, no authentication password is requested to clients. In this mode connections are only accepted from the loopback interface. If you want to connect from external computers to Redis you may adopt one of the following solutions: 1) Just disable protected mode sending the command 'CONFIG SET protected-mode no' from the loopback interface by connecting to Redis from the same host the server is running, however MAKE SURE Redis is not publicly accessible from internet if you do so. Use CONFIG REWRITE to make this change permanent. 2) Alternatively you can just disable the protected mode by editing the Redis configuration file, and setting the protected mode option to 'no', and then restarting the server. 3) If you started the server manually just for testing, restart it with the '--protected-mode no' option. 4) Setup a bind address or an authentication password. NOTE: You only need to do one of the above things in order for the server to start accepting connections from the outside.

192.168.1.20:26379>

 

 

修改redis配置

bind 0.0.0.0

port 6379

requirepass abc

#　protected-mode yes　　　＃这里修改yes no 不影响。 不该sentinel配置依旧会报错

 

sentinel配置添加

protected-mode no

 

 

测试不再报错

 

 

2. 代码

# 测试sentinel时注释掉直连部分

#/usr/bin/env python3
# -*- coding:utf-8 -*-
#   mail: infaaf@126.com

import redis
from redis.sentinel import Sentinel
import random
#直接连接方式
client= redis.StrictRedis(host='192.168.1.20',port=6379,db=0,password='abc')
res=client.get('k1').decode()
print('直接连接方式操作',res)


# sentinel连接方式
sentinel = Sentinel([('192.168.1.20',26379),('192.168.1.21',26379),('192.168.1.22',26379)],socket_timeout=0.1)
master = sentinel.discover_master('mymaster')
slave = sentinel.discover_slaves('mymaster')
# print(master)  # ('192.168.1.20', 6379)
# print(slave)   # [('192.168.1.22', 6379), ('192.168.1.21', 6379)]

writeclient= redis.StrictRedis(host=master[0],port=master[1],db=0,password='abc')
r= random.randrange(0,len(slave))
readclient=redis.StrictRedis(host=slave[r][0],port=slave[r][1],db=0,password='abc')
userdict={'name':'tom','type':'cat'}
writeclient.hmset('u:1',userdict)
res = readclient.hget('u:1','name').decode()
print(res)

修改版

#/usr/bin/env python3
# -*- coding:utf-8 -*-
#   mail: infaaf@126.com

import redis
from redis.sentinel import Sentinel
import random
#直接连接方式
# client= redis.StrictRedis(host='192.168.1.20',port=6379,db=0,password='abc')
# res=client.get('k1').decode()
# print('直接连接方式',res)


# 哨兵连接方式： 从sentinel获取主从节点后连接   # 从redis2.8开始支持
sentinel = Sentinel([('192.168.1.20',26379),('192.168.1.21',26379),('192.168.1.22',26379)],socket_timeout=0.1)
master = sentinel.discover_master('mymaster')
slave = sentinel.discover_slaves('mymaster')
print(master)  # ('192.168.1.20', 6379)
print(slave)   # [('192.168.1.22', 6379), ('192.168.1.21', 6379)]

# 手动过程连接 （测试用）
writeclient= redis.StrictRedis(host=master[0],port=master[1],db=0,password='abc')
r= random.randrange(0,len(slave))
readclient=redis.StrictRedis(host=slave[r][0],port=slave[r][1],db=0,password='abc')
userdict={'name':'tom','type':'cat'}
writeclient.hmset('u:1',userdict)
res = readclient.hget('u:1','name').decode()
print('哨兵连接方式   clinet: {client},   res: {res}'.format(client=slave[r],res=res))

# 自动连接 （实际使用）
automaster = sentinel.master_for('mymaster', socket_timeout=0.5, password='abc', db=0)
w_ret = automaster.set('foo', 'bar')
autoslave = sentinel.slave_for('mymaster', socket_timeout=0.5, password='abc', db=0)
r_ret = autoslave.get('foo')
print('自动选取从节点获取数据',r_ret)

结果