为什么 crontab 不执行我的 PHP 脚本?

问题描述

我已经构建了一个 php 文件来检查一些结果，因此我需要设置一个 cronjob.

I have built one php file to check some result, so that I need to setup a cronjob.

我设置了每 30 分钟运行一次，以便发送结果.但是，我不知道为什么我的 crontab 没有每 30 分钟运行一次.

I set one to run every 30 minute, so that the results will be send. However, I don't know why my crontab did not run after every 30 minute.

这是我设置 crontab 的方法:

Here is how I set the crontab:

*/30 * * * * php /var/www/html/result.php

我已经确认我的文件目录是正确的.我不确定的是关于计时部分:是否可以使用 */30 * * * * 或 30 * * * * ?我设置了 */30 * * * * 并没有工作.

I have confirmed my file directory is correct. What I not sure is about the timing part: isn't it possible to use */30 * * * * or 30 * * * * ? I set */30 * * * * and did not work.

推荐答案

Given

*/30 * * * * php /var/www/html/result.php

它不工作的原因有多种可能:

There are multiple possibilities why it is not working:

1. 首先检查php/var/www/html/result.php 是否简单执行很重要.这是必需的.但不幸的是，完成这并不意味着问题就解决了.

1. First of all it is important to check if the simple execution of php /var/www/html/result.php. This is required. But unfortunately, accomplishing this does not mean that the problem is solved.

必须添加 php 二进制文件的路径.

The path of the php binary has to be added.

*/30 * * * * php /var/www/html/result.php

改成

*/30 * * * * /usr/bin/php /var/www/html/result.php

或来自 which php 的任何内容.

or whatever coming from which php.

检查脚本对运行 crontab 的用户的权限.

Check the permission of the script to the user running the crontab.

赋予文件执行权限:chmod +x file.并确保 crontab 是由有权执行脚本的用户启动的.还要检查用户是否可以访问文件所在的目录.

Give execution permission to the file: chmod +x file. And make sure the crontab is launched by a user having rights to execute the script. Also check if the user can access the directory in which the file is located.

为了更安全，还可以在脚本顶部添加php路径，如:

To be safer, you can also add the php path in the top of the script, such as:

#!/usr/bin/php -q
<?php

 ...

?>

* * * * * touch /tmp/hello

*/30 * * * * /usr/bin/php /var/www/html/result.php > /tmp/result

*/30 * * * * /usr/bin/php -f /var/www/html/result.php > /tmp/result