为什么 crontab 不执行我的 PHP 脚本?
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:
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.
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
...
?>
确保用户有权使用 crontab.检查他是否在 /etc/cron.d/deny 文件中.另外，做一个基本的测试，看看是crontanb还是php的问题.
Make sure the user has rights to use crontab. Check if he is in the /etc/cron.d/deny file. Also, make a basic test to see if it is a crontanb or php problem.
* * * * * touch /tmp/hello
将脚本的结果输出到日志文件，如牛伟建议.
*/30 * * * * /usr/bin/php /var/www/html/result.php > /tmp/result
使用-f选项来执行脚本:
*/30 * * * * /usr/bin/php -f /var/www/html/result.php > /tmp/result
确保 crontab 中的格式正确.例如，您可以使用网站 Crontab.guru.
<小时>
总结，可能的原因有很多.其中之一应该可以解决问题.
To sum up, there are many possible reasons. One of them should solve the problem.
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