Nginx－Primary script unknown的报错的解决方法

配置nginx时一直报错：file not found

错误日志：

[error] 12691#0: *6 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 192.168.168.1, server: localhost, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "192.168.168.133"

改成下面的配置恢复正常，/datao/htdocs/thinkphp为根目录

{
    listen          80;
    server_name     www.tp.com;
    access_log      /data1/logs/tp_access.log myformat;
    index index.html index.htm index.php;
    root    /datao/htdocs/thinkphp;

    location ~ \.php
    {
            fastcgi_index index.php;
            fastcgi_pass 127.0.0.1:9000;
            include      fastcgi_params;
            set $path_info "";
            set $real_script_name $fastcgi_script_name;
            if ($fastcgi_script_name ~ "^(.+?\.php)(/.+)$") {
                    set $real_script_name $1;
                    set $path_info $2;
            }
            fastcgi_param SCRIPT_FILENAME /data0/htdocs/thinkphp/$real_script_name;
            fastcgi_param SCRIPT_NAME $real_script_name;
            fastcgi_param PATH_INFO $path_info;
    }               
}