How to implement master-slave replication of Memcached database in PHP

Memcached is an open source, high-performance distributed memory object caching system that can be used to speed up web applications and performs particularly well in large-scale data caching. For this system, master-slave replication is a very important function, which can be used to ensure data reliability and high availability. This article will introduce how to use PHP to implement master-slave replication of Memcached database.

1. Introduction to the master-slave mode

The master-slave mode is a distributed structure of the Memcached server. It consists of at least two servers: a master server and at least one slave server. In the master-slave mode, the master server will synchronize the written data to all slave servers, and when reading data, the slave server can share the pressure of the master server. Therefore, the master-slave mode can better ensure the load balancing of the system and achieve high availability and high-performance access.

2. PHP implements Memcached master-slave replication

To implement Memcached database master-slave replication, you need to prepare at least two Memcached servers, one of which is the main server and the rest are from the server. When writing data, we need to write data to both the master server and the slave server; and when reading data, we need to read from the slave server. The following is the PHP code implementation:

<?php

//创建主服务器的连接
$mc1 = new Memcached();
$mc1->addServer('localhost', 11211);

//创建从服务器的连接
$mc2 = new Memcached();
$mc2->addServer('localhost', 11212);

//设置主从模式
$mc2->setOption(Memcached::OPT_SLAVE, true);

//写入数据
$mc1->set('key', 'value');
$mc2->set('key', 'value');

//读取数据
$value = $mc2->get('key');
echo $value;

?>

In the above code, we first create two Memcached server objects, one representing the master server and one representing the slave server. Then, we set the OPT_SLAVE option through the setOption() function to enable slave server mode.

Next, we use the set() function to write data to the master server and slave server at the same time to ensure the consistency of the data on both sides. When reading data, we use the get() method of the slave server to reduce the pressure on the master server.

In actual applications, we can achieve load balancing and high availability by deploying the master and slave servers on different machines.

3. Summary

Using Memcached master-slave mode can make the system more performant and highly available, and PHP, as a mainstream programming language, can be used in conjunction with Memcached , easily achieve efficient access to distributed systems. Through this article, I hope to help readers understand how to use PHP to implement master-slave replication of Memcached database.

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