cronjob 不执行独立运行的脚本 [英] cronjob does not execute a script that works fine standalone

问题描述

我在 /var/www/html/dbsync/index.php 中有我的 php 脚本文件.当 cd/var/www/html/dbsync/ 并运行 php index.php 时，它完美运行.

I have my php script file in /var/www/html/dbsync/index.php. When cd /var/www/html/dbsync/ and run php index.php it works perfectly.

我想通过sh文件调用PHP文件，SH文件的位置如下

I want to call PHP file through sh file, the location of SH file is as below

/var/www/html/dbsync/dbsync.sh

这是dbsync.sh文件的内容:

/usr/bin/php /var/www/html/dbsync/index.php >> /var/www/html/dbsync/myscript.log 2>&1 -q -f

当我 cd/var/www/html/dbsync/ 并运行 ./dbsync.sh 时，它也能完美运行.

When I cd /var/www/html/dbsync/ and run ./dbsync.sh it works perfectly as well.

现在，如果我设置 crontab 如下:

Now if I set up crontab as below:

1 * * * * /var/www/html/dbsync/dbsync.sh /var/www/html/dbsync

但是，这个 crontab 没有按预期工作.

However, this crontab is not working as expected.

有什么问题?

推荐答案

如评论中所见，问题在于您没有定义应该使用什么程序来执行脚本.考虑到 cronjob 是在一个很小的环境中执行的；在那里，不能假设太多.这就是我们定义完整路径等的原因.

As seen in comments, the problem is that you are not defining what program should be used to execute the script. Take into account that a cronjob is executed in a tiny environment; there, not much can be assumed. This is why we define full paths, etc.

所以你需要这样说:

1 * * * * /bin/sh /var/www/html/dbsync/dbsync.sh /var/www/html/dbsync
#         ^^^^^^^

/bin/sh 是您要用来执行脚本的二进制文件.

/bin/sh being the binary you want to use to execute the script.

否则，您可以为脚本设置执行权限并添加一个shell-script header 告诉它使用什么解释器:

Otherwise, you can set execution permissions to the script and add a shell-script header telling it what interpreter to use:

#!/bin/sh

如果这样做，则不需要添加二进制文件的路径.

If you do this, adding the path of the binary is not necessary.

来自 解决 cron 作业的常见问题:

使用相对路径.如果您的 cron 作业正在执行某个脚本种类，您必须确保在该脚本中仅使用绝对路径.例如，如果您的脚本位于/path/to/script.phpand你试图在同一目录中打开一个名为 file.php 的文件，您不能使用相对路径，例如 fopen(file.php).该文件必须从其绝对路径调用，如下所示:fopen(/path/to/file.php).这是因为 cron 作业不一定从以下目录运行脚本所在的位置，因此必须专门调用所有路径.

Using relative paths. If your cron job is executing a script of some kind, you must be sure to use only absolute paths inside that script. For example, if your script is located at /path/to/script.phpand you're trying to open a file called file.php in the same directory, you cannot use a relative path such as fopen(file.php). The file must be called from its absolute path, like this: fopen(/path/to/file.php). This is because cron jobs do not necessarily run from the directory in which the script is located, so all paths must be called specifically.

<小时>

另外，我知道您想每分钟运行一次.如果是这样， 1 * * * * 不会做.相反，它会每小时过去的每 1 分钟 运行一次.所以如果你想每分钟运行一次，就说* * * * *.

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Also, I understand you want to run this every minute. If so, 1 * * * * won't do. Intead, it will run at every 1st minute past every hour. So if you want to run it every minute, say * * * * *.

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