How to install redis on Ubuntu system

In web development, caching is a very important technology. Caching can greatly improve access speed, reduce server burden, and improve user experience of Web sites. In PHP development, redis is an excellent caching tool. Redis is a memory-based key-value storage database that can be stored using a variety of data structures, such as strings, hash tables, lists, sets, etc. This article will introduce how to install redis on Ubuntu system and integrate redis with PHP.

Step 1: Install the redis server

In Ubuntu, installing the redis server is very simple. First, use the following command in the terminal to update:

sudo apt-get update

After the update is completed, use the following command to install redis-server:

sudo apt-get install redis-server

During the installation process, the system will prompt whether to continue the installation, press Just "Y". After the installation is complete, you can use the following command to check whether redis-server has run successfully:

redis-cli ping

If the server returns PONG, it means redis-server has run successfully.

Step 2: Integrate with PHP

In PHP development, you can use the php-redis extension package to interact with redis-server. In order to use the php-redis extension package, you need to install php-redis in Ubuntu first. Use the following command to install:

sudo apt-get install php-redis

After the installation is complete, you need to introduce the php-redis extension package in the php.ini file. Open the terminal and enter the following command:

sudo nano /etc/php/7.2/cli/php.ini

At this time, the editor will open the php.ini file and find the following two lines:

;extension=redis.so
;extension=redis_cluster.so

Delete the preceding ";" and save the file:

extension=redis.so
extension=redis_cluster.so

After saving, use the following command to restart the php-fpm process:

sudo systemctl restart php7.2-fpm

After the restart is complete, use the following command to check whether the php-redis expansion package has been successfully introduced:

php -m | grep redis

If the server returns redis, it means that the php-redis extension package has been successfully introduced.

Step 3: Use php-redis

It is very simple to use php-redis to interact with redis-server. The following is a simple example:

<?php

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$redis->set('name', 'hello world!');
echo $redis->get('name');

?>

In the above code, the new Redis() method is first used to create a Redis object, and then the $redis->connect() method is used to connect to the redis-server. Finally, use the $redis->set() method to write a key-value pair to redis-server, and use the $redis->get() method to obtain the value of the key-value pair from redis-server.

Summary

This article introduces how to install the redis server on the Ubuntu system and integrate redis with PHP. By using redis, we can greatly improve the speed of the Web site, reduce the load on the server, and ensure the user experience of the Web site.

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