php操作redis cluster集群

Posted 2020-12-03

php要操作redis cluster集群有两种方式：

1、使用phpredis扩展，这是个c扩展，性能更高，但是phpredis2.x扩展不行，需升级phpredis到3.0，但这个方案参考资料很少

2、使用predis，纯php开发，使用了命名空间，需要php5.3+，灵活性高

我用的是predis，下载地址https://github.com/nrk/predis/zipball/master
下载后的软件包为：
nrk-predis-v1.1.0-65-gd72f067.zip
上传到服务器上，解压后:
unzip nrk-predis-v1.1.0-65-gd72f067.zip
下载好后重命名为predis，

mv nrk-predis-d72f067 predis
mv predis /data/www/facx195.com

注意，我的环境是php，所以在lnmp环境中也没必要装php的phpredis扩展也是可以在浏览器请求php文件来获取redis中的数据的

redis的实例环境为：

192.168.2.106:20380
192.168.2.106:31680
192.168.2.107:20380
192.168.2.107:31680
192.168.2.99:20380
192.168.2.99:31680

[[email protected] wwwlogs]# cat /data/www/facx195.com/predis.php

<?php
require ‘/data/www/fx195.com/predis/autoload.php‘;//引入predis相关包
//redis实例
$servers = array(
    ‘tcp://192.168.2.99:20380‘,
    ‘tcp://192.168.2.106:31680‘,
    ‘tcp://192.168.2.107:20380‘,
    ‘tcp://192.168.2.99:31680‘,
    ‘tcp://192.168.2.106:20380‘,
    ‘tcp://192.168.2.107:31680‘,
);

$client = new PredisClient($servers, array(‘cluster‘ => ‘redis‘));

$client->set("name4", "44");
$client->set("name5", "55");
$client->set("name6", "66");

$name1 = $client->get(‘name4‘);
$name2 = $client->get(‘name5‘);
$name3 = $client->get(‘name6‘);
var_dump($name1, $name2, $name3);die;
?>

name1，name2，name3是3个key，按照算法分配到3个slot上，有可能分到3台服务器上

首先运行predis.php查看结果：

如图：

然后登录到redis客户端进行集群验证：

[[email protected] ~]# redis-cli -h 192.168.2.106 -p 20380 -c

192.168.2.106:20380> get name4
-> Redirected to slot [8736] located at 192.168.2.107:20380
"44"
192.168.2.107:20380> get name5
-> Redirected to slot [12801] located at 192.168.2.106:20380
"55"
192.168.2.106:20380> get name6
-> Redirected to slot [610] located at 192.168.2.107:31680
"66"
192.168.2.107:31680> 

[[email protected] ~]# redis-cli -h 192.168.2.107 -p 31680 -c
192.168.2.107:31680> get name4
-> Redirected to slot [8736] located at 192.168.2.107:20380
"44"
192.168.2.107:20380> get name6
-> Redirected to slot [610] located at 192.168.2.107:31680
"66"
192.168.2.107:31680> get name5
-> Redirected to slot [12801] located at 192.168.2.106:20380
"55"
192.168.2.106:20380> 

登录99机器上的redis,报错，原因是99机器的上redis一直是关闭的，但是这样并不会在重启99机器上的redis实例后登录99机器上的redis查不到数据的

[[email protected] ~]# redis-cli -h 192.168.2.99 -p 31680 -c
Could not connect to Redis at 192.168.2.99:31680: Connection refused
Could not connect to Redis at 192.168.2.99:31680: Connection refused
not connected> get name6
Could not connect to Redis at 192.168.2.99:31680: Connection refused
not connected> 

启动192.168.2.99上的2台redis

[[email protected] conf]# redis-server 20380.conf 
[[email protected] conf]# redis-server 31680.conf 

[[email protected] ~]# redis-cli -h 192.168.2.99 -p 31680 -c
192.168.2.99:31680> get name5
-> Redirected to slot [12801] located at 192.168.2.106:20380
"55"
192.168.2.106:20380> get name6
-> Redirected to slot [610] located at 192.168.2.107:31680
"66"
192.168.2.107:31680> get name4
-> Redirected to slot [8736] located at 192.168.2.107:20380
"44"
192.168.2.107:20380> 

参考资料：
https://blog.csdn.net/nuli888/article/details/52136918