Connecting to Redis on phpredis (PHP)

Prerequisites

• A Redis instance is created, and is in the Running state. To create a Redis instance, see Buying a DCS Redis Instance.
• An ECS has been created. For details about how to create an ECS, see Purchasing an ECS
• If the ECS runs the Linux OS, ensure that the GCC compilation environment has been installed on the ECS.
• The client and the Redis instance must be interconnected before connecting to the instance. For details, see Network Conditions for Accessing DCS Redis.

Connecting to Redis on phpredis

1. View the IP address/domain name and port number of the DCS Redis instance to be accessed.

   For details, see Viewing and Modifying Basic Settings of a DCS Instance.

2. Log in to the ECS.

   The following uses CentOS as an example to describe how to access an instance through phpredis.

3. Install GCC-C++ and Make compilation components.

   yum install gcc-c++ make

4. Install the PHP development package and CLI tool.

   Run the following yum command to install the PHP development package:

   yum install php-devel php-common php-cli

   After the installation is complete, run the following command to query the PHP version and check whether the installation is successful:

   php --version

5. Install the phpredis client.
   1. Download the source phpredis package.

      wget http://pecl.php.net/get/redis-5.3.7.tgz

      This version is used as an example. To download phpredis clients of other versions, visit the Redis or PHP official website.

   2. Decompress the source phpredis package.

      tar -zxvf redis-5.3.7.tgz

      cd redis-5.3.7

   3. Command before compilation.

      phpize

   4. Configure the php-config file.

      ./configure --with-php-config=/usr/bin/php-config

      The location of the file varies depending on the OS and PHP installation mode. You are advised to locate the directory where the file is saved before the configuration.

      find / -name php-config

   5. Compile and install the phpredis client.

      make && make install

   6. After the installation, add the extension configuration in the php.ini file to reference the Redis module.

      vim /etc/php.ini

      Add the following configuration:

      extension = "/usr/lib64/php/modules/redis.so"

      

      The redis.so file may be saved in a different directory from php.ini. Run the following command to locate the directory:

      find / -name php.ini

   7. Save the configuration and exit. Then, run the following command to check whether the extension takes effect:

      php -m |grep redis

      If the command output contains redis, the phpredis client environment has been set up.

6. Access the DCS instance by using phpredis.
   1. Edit a redis.php file.

      <?php
          $redis_host = "{redis_instance_address}";
          $redis_port = {port};
          $user_pwd = "{password}";
          $redis = new Redis();
          if ($redis->connect($redis_host, $redis_port) == false) {
             die($redis->getLastError());
          }
          if ($redis->auth($user_pwd) == false) {
              die($redis->getLastError());
          }
          if ($redis->set("welcome", "Hello, DCS for Redis!") == false) {
              die($redis->getLastError());
          }
          $value = $redis->get("welcome");
          echo $value;
          $redis->close();
      ?>

      {redis_instance_address} indicates the example IP address/domain name of the DCS instance and {port} indicates the port number of the DCS instance. For details about how to obtain the IP address/domain name and port, see 1. Change them as required. {password} indicates the password used to log in to the chosen DCS Redis instance. This password is defined during DCS Redis instance creation. If password-free access is enabled, shield the if statement for password authentication.

   2. Run the php redis.php command to access the DCS instance.