PHP 调用 shell 时,有些时候会遇到权限问题,通过查看Apache日志可以发现如下的内容 rm: instrumentscli0.trace/form.template: Permission denied 原因是shell在执行这些语句时可能需要root权限,可以在脚本中的具体语句加上sudo ,比如 sudo rm xxx;当然
PHP调用shell时,有些时候会遇到权限问题,通过查看Apache日志可以发现如下的内容
rm: instrumentscli0.trace/form.template: Permission denied
原因是shell在执行这些语句时可能需要root权限,可以在脚本中的具体语句加上sudo ,比如 sudo rm xxx;当然最好是不要修改shell脚本,而是在php调用shell时,加上sudo ./xxx.sh
加上sudo后再次执行,发现第二个问题
sudo: no tty present and no askpass program specified
原因是执行sudo时需要一个终端来输入密码,解决方法是赋予Apache的执行用户root权限。
方法:修改visudo文件
命令如下
sudo visudo
在visudo文件中为Apache的执行用户分配权限,新增下面这一行
_www ALL=(ALL) NOPASSWD: ALL
赋予_www用户所有权限,并且不需要输入密码,这其中,第一项是Apache执行用户的名称,不同的版本可能不一样,有的是nobody,有的是daemon, 有的是_www。
可以通过查看Apache目录下的httpd.conf获悉具体用户,该文件有如下一段配置项
# If you wish httpd to run as a different user or group, you must run
# httpd as root initially and it will switch.
#
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
# running httpd, as with most system services.
#
User _www
Group _www
这里就是执行用户,出于安全考虑,最好把默认的用户名修改为自定义的用户,当然也可以不修改。

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