How to perform disaster recovery, backup and recovery of PHP flash sale system

How to perform disaster recovery and backup recovery of PHP flash sale system

1. Background introduction
With the rise of e-commerce and the advancement of Internet technology, flash sale activities It is widely used in the e-commerce industry. However, in flash sale activities where a large number of users participate at the same time, system disaster recovery and backup and recovery have become important links to ensure user experience. This article will introduce how to use PHP to implement disaster recovery and backup recovery of the flash sale system, and provide relevant code examples.

2. Disaster recovery design

1. Distributed architecture: Split the system into multiple subsystems, each subsystem is independently deployed on a different server, and each other is load balanced server to make distribution requests. In this way, once a certain subsystem fails, services can be provided through other systems.
2. High availability: Ensure the high availability of the system by using master-slave replication or clustering. In master-slave replication, the master server is responsible for processing requests and synchronizing data to the slave server. Once the master server fails, the slave server can immediately take over the request. In cluster mode, multiple servers work together to provide load balancing and failover functions.
3. Caching technology: Using caching technology can reduce the number of database accesses and improve the concurrency capability of the system. Store the inventory information of flash sale products in the cache. User requests query the cache first. If there is no cache, query the database again. And use distributed cache to disperse the cache data to multiple nodes to improve the concurrency capability of the cache.

3. Backup and recovery design

1. Database backup: Back up the database regularly and ensure the availability of the backup files. You can use cron scheduled tasks in combination with the mysqldump command to back up the database to a specified location while retaining multiple backup files for recovery.
2. File backup: In addition to database backup, other important files of the system also need to be backed up, such as program files, configuration files, etc. Regularly back up these files to an external storage device by using a script or tool.
3. Disaster recovery testing: Regularly conduct disaster recovery testing on backup files, that is, restore backup files to the test environment and verify the integrity and availability of the data. If problems are found in backup files or during the recovery process, promptly repair and update the backup strategy.

4. Specific code examples

1. Use load balancer for request distribution:

   <?php
    $servers = ['192.168.0.1', '192.168.0.2', '192.168.0.3']; // 子系统服务器地址列表
    $server = $servers[array_rand($servers)]; // 随机选择一台服务器
    $url = "http://".$server."/seckill"; // 秒杀接口地址
    // 发送请求到指定服务器
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_exec($ch);
    curl_close($ch);
   ?>

2. Use master-slave Replication method to achieve high availability:

   <?php
    try {
        $dsn = "mysql:host=localhost;dbname=test";
        $username = "root";
        $password = "";
        $options = [
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
            PDO::ATTR_EMULATE_PREPARES => false,
        ];
        // 主服务器连接
        $pdo = new PDO($dsn, $username, $password, $options);
        // 从服务器连接
        $pdo->setAttribute(PDO::ATTR_AUTOCOMMIT, 0); 
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
        $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
        $pdo_slave = new PDO($dsn, $username, $password, $options);
   
        // 执行查询操作
        $stmt = $pdo_slave->query("SELECT * FROM seckill_goods WHERE id = ?");
        $result = $stmt->fetch();
        // ...
    } catch (PDOException $e) {
        echo "Error: " . $e->getMessage();
    }
   ?>

3. Use Redis as cache:

   <?php
    $redis = new Redis();
    $redis->connect('127.0.0.1', 6379); // Redis服务器地址和端口
    $stock = $redis->get('seckill_stock'); // 获取缓存中秒杀商品的库存信息
    if($stock > 0) {
        // 执行秒杀操作
        // ...
        $redis->decr('seckill_stock'); // 减少库存
    } else {
        // 商品已售罄
        // ...
    }
   ?>

In summary, through reasonable disaster recovery and backup recovery The design can improve the availability and reliability of the PHP flash sale system, ensure the user experience, and improve the operating efficiency of the system. The above is only part of the sample code, and the specific implementation needs to be adjusted and optimized according to the specific situation. At the same time, in practical applications, it is also necessary to combine monitoring and alarm solutions to detect and handle system faults in a timely manner to ensure the stable operation of the flash sale system.

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