尝试将 symfony 5 应用程序与 heroku 上的 redis 连接时出错答案

【问题标题】：Error trying to connect symfony 5 app with redis on heroku尝试将 symfony 5 应用程序与 heroku 上的 redis 连接时出错
【发布时间】：2020-06-04 07:42:20
【问题描述】：

我在尝试将 symfony 5 应用程序与 heroku 上的 redis 服务器连接时遇到问题。
- 我的 composer.json 和 composer.lock 设置了 ext-redis:"*"。

"require": {
        "php": "~7.4.0",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "ext-intl": "*",
        "ext-openssl": "*",
        "ext-redis": "*",
        ...
}

我在 heroku 上有 3 个配置变量：

heroku redis 模块激活后创建的默认变量
REDIS_URL = redis://h:someHash@ec2.eu-west-1.compute.amazonaws.com:27269

自定义 var 以适应 php 类 Redis 构造函数
REDIS_HOST = redis://h:someHash@ec2.eu-west-1.compute.amazonaws.com
REDIS_PORT = 27269

我的部署因错误而停止：无法找到套接字传输“redis” - 您是否在配置 PHP 时忘记启用它？

部署完整日志：



-----> PHP app detected

-----> Bootstrapping...

-----> Installing platform packages...

       - php (7.4.6)

       - ext-intl (bundled with php)

       - ext-redis (5.2.2)

       - apache (2.4.43)

       - nginx (1.18.0)

-----> Installing dependencies...

       Composer version 1.10.6 2020-05-06 10:28:10

       Loading composer repositories with package information

       Installing dependencies from lock file

       Package operations: 108 installs, 0 updates, 0 removals

         - Installing ocramius/package-versions (1.8.0): Loading from cache

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       Generating optimized autoload files

       ocramius/package-versions: Generating version class...

       ocramius/package-versions: ...done generating version class

       62 packages you are using are looking for funding.

       Use the `composer fund` command to find out more!

       Executing script cache:clear [KO]

        [KO]

       Script cache:clear returned with error code 1

       !!  

       !!  In App_KernelProdContainer.php line 3884:

       !!                                                                                 

       !!    Unable to find the socket transport "redis" - did you forget to enable it w  

       !!    hen you configured PHP?                                                      

       !!                                                                                 

       !!  

       !!  

       Script @auto-scripts was called via post-install-cmd

 !     ERROR: Dependency installation failed!

 !     

 !     The 'composer install' process failed with an error. The cause

 !     may be the download or installation of packages, or a pre- or

 !     post-install hook (e.g. a 'post-install-cmd' item in 'scripts')

 !     in your 'composer.json'.

 !     

 !     Typical error cases are out-of-date or missing parts of code,

 !     timeouts when making external connections, or memory limits.

 !     

 !     Check the above error output closely to determine the cause of

 !     the problem, ensure the code you're pushing is functioning

 !     properly, and that all local changes are committed correctly.

 !     

 !     For more information on builds for PHP on Heroku, refer to

 !     https://devcenter.heroku.com/articles/php-support

 !     Push rejected, failed to compile PHP app.

 !     Push failed

我错过了扩展吗？

【问题讨论】：

我认为问题出在使用 php-redis 扩展，当 Heroku 告诉使用 Predis 时。但是由于 Predis 不再维护，我怎样才能使它与 php-redis 扩展一起工作？ heroku build 中似乎缺少 php-igbinary 模块

标签： heroku redis symfony5

【解决方案1】：

您只需要正确实例化 \Redis 对象。根据您提供的 Redis URL，它应该是这样的（phpredis 扩展的代码）：

$redis = new \Redis();
$redis->connect('ec2.eu-west-1.compute.amazonaws.com', 27269);
$redis->auth('someHash');

这里的棘手部分是您不需要 Heroku 提供的 Redis URL 中的用户名“t”。

【讨论】：

当我安装 Heroku Redis 插件时，它默认给我REDIS_URL 变量。有没有办法使用该字符串而不是将其分解为主机、端口和密码并将它们分别传递给connect() 方法？
似乎 phpredis 扩展没有接受这种格式的连接字符串的接口：github.com/phpredis/phpredis#connect-open