How to implement automatic switching of Memcached master-slave replication in PHP

Memcached is a high-performance caching tool that can improve website performance and response speed by storing data in the cache. When using Memcached, we usually need to use master-slave replication to improve data availability and reliability. This article will introduce how to use PHP to implement automatic switching of Memcached master-slave replication.

1. What is Memcached master-slave replication?

Memcached master-slave replication refers to the backup and replication of data by copying the data of the master server to a group of slave servers. This can improve the availability and reliability of data. When the master server fails, the slave server can automatically take over the service to ensure that the data can be accessed normally.

2. Steps to implement Memcached master-slave replication

2.1 Configure the main server

On the main server, we need to start the Memcached service and configure the server to allow Connection from server. Specify the available memory space by setting the "-m" parameter, for example:

memcached -m 64 -p 11211 -d

2.2 Configure the slave server

On the slave server , we need to start the Memcached service and specify the address and startup mode of the slave server by setting the "-s" and "-d" parameters, for example:

memcached -s 127.0.0.1:11211 -d

2.3 Configuring the PHP client

In the PHP client, we need to configure the Memcached client by setting the "$options" array. We can use the "Memcached::OPT_SERVERS" option to specify the addresses and port numbers of the master and slave servers, and use the "Memcached::DISTRIBUTION_CONSISTENT" option to enable consistent hash distribution. For example:

$options = [

Memcached::OPT_SERVERS => [
    ['127.0.0.1', 11211, 60],
    ['127.0.0.2', 11211, 60],
],
Memcached::OPT_DISTRIBUTION => Memcached::DISTRIBUTION_CONSISTENT,

];

$mc = new Memcached();
$mc->setOptions($options);

2.4 Implement automatic switching

In the PHP client, we can obtain the status code of the Memcached operation and determine whether the main server is available by using the "Memcached::getResultCode" method. If the master server is unavailable, we can manually route the Memcached client to the slave server, for example:

$value = $mc->get('key');
if ($mc-> ;getResultCode() != Memcached::RES_SUCCESS) {

$mc->resetServerList();
$mc->addServer('127.0.0.2', 11211);
$value = $mc->get('key');

}

3. Summary

Through the above steps, we can use PHP to implement the Memcached master A method to automatically switch from replication, thereby increasing data availability and reliability. However, it should be noted that automatic switching may cause data inconsistency or loss, so it needs to be designed and used with caution.

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