摘要：關于主從服務器配置就略過了，以下基于你已經配置好好，然后在環境下如何使用。配置使用的是擴展主從從隊列用到命令參考注意看文檔需要將設置為使用具體參數含義查看日志可以看到使用的從服務器查看日志可以看到使用的主服務器

關于redis主從服務器配置就略過了，以下基于你已經配置好好，然后在laravel環境下如何使用。

laravel 使用的是 predis 擴展
composer require predis/predis
vi config/database.php

"redis"=>[
   "cluster" => false,
    "default" => [
        "tcp://" . env("REDIS_DEFAULT_HOST") . ":" . env("REDIS_DEFAULT_PORT") . "?database=0&alias=master",//主
        "tcp://" . env("REDIS_DEFAULT_HOST_R") . ":" . env("REDIS_DEFAULT_PORT_R") . "?database=0&alias=slave_1",//從
        "tcp://" . env("REDIS_DEFAULT_HOST_R2") . ":" . env("REDIS_DEFAULT_PORT_R2") . "?database=0&alias=slave_2",//從
    ],
     "test" => [ 
                "host" => "127.0.0.1",
                "port" => 6379,
                "database" => 1,
            ],//隊列用到multi命令
             "options" => [
                "replication" => true,
                "connections" =>[
                    "tcp" => "AppServicesRedis",
                ],
            ],
];

//master slave   vendor/predis/predis/src/Connection/Aggregate/SentinelReplication.php:189
public function add(NodeConnectionInterface $connection)
    {
        $alias = $connection->getParameters()->alias;

        if ($alias === "master") {
            $this->master = $connection;
        } else {
            $this->slaves[$alias ?: count($this->slaves)] = $connection;
        }

        $this->reset();
    }

vi app/services/redis.php
//參考 https://github.com/nrk/predis/blob/v1.1/examples/debuggable_connection.php
namespace AppServices;

use PredisCommandCommandInterface;
use PredisConnectionStreamConnection;

class Redis extends StreamConnection
{
    private $tstart = 0;
    private $debugBuffer = [];

    public function connect()
    {
        $this->tstart = microtime(true);

        parent::connect();
    }

    private function storeDebug(CommandInterface $command, $direction)
    {
        $firtsArg = $command->getArguments();
        $timestamp = (microtime(true) - $this->tstart) * 1000;
        $log = [];
        $log["cmd"] = $command->getId();
        $log["key"] = isset($firtsArg) ?  $firtsArg  : " ";
        $log["server"] = "$direction $this";
        $log["time"] = $timestamp;
        $data = ["server" => trim($log["server"]), "cmd" => $command->getId(), "key" => $log["key"],"time" => $timestamp, "msg" => ["host" => explode(":", trim($log["server"]))[0], "port" => explode(":", trim($log["server"]))[1]]]];
        openlog("syslog",LOG_PID|LOG_ODELAY,LOG_LOCAL7);
        syslog(LOG_INFO,json_encode($data));
        closelog();
        dump($log);
        $this->debugBuffer[] = $log;
    }

    public function writeRequest(CommandInterface $command)
    {
        parent::writeRequest($command);

//        $this->storeDebug($command, "->");
    }

    public function readResponse(CommandInterface $command)
    {
        $response = parent::readResponse($command);
        $this->storeDebug($command, "");

        return $response;
    }

    public function getDebugBuffer()
    {
        return $this->debugBuffer;
    }

    public static function debug()
    {
        $options = [
            "connections" =>[
                "tcp" => "AppServicesRedis",
            ],
        ];

        $client = new PredisClient(config("database.redis.default"), $options);
        $client->get("redis:test");
        print_r($client->getConnection());
    }
}

看文檔 https://github.com/nrk/predis 需要將 replication 設置為true

The basic configuration needed to use the client in replication mode requires one Redis server to be identified as the master (this can be done via connection parameters using the alias parameter set to master) and one or more servers acting as slaves:

//具體參數含義 vendor/predis/predis/src/Connection/ParametersInterface.php:16
$redis = new PredisClient([
                "scheme" => "tcp",
                "host"   => "127.0.0.1",
                "port"   => 6379,
                "read_write_timeout" => 0,
            ]);
        $redis = Redis::connection("default");
        $key = "master:test";
        $redis->set($key, 666);//tail -f /var/log/messages 查看Redis日志可以看到使用的從服務器 REDIS_DEFAULT_HOST_R
        dump($redis->get($key));    //查看Redis日志可以看到使用的主服務器 REDIS_DEFAULT_HOST