FastCGI sent in stderr: "Primary script unknown" while reading response head

nginx和php-fpm不能通信，网上各种办法都试过，就是不行，后来换了一下root的位置就解决了！

出现这个原因有三：

1、文件不存在

2、php-fpm 与nginx不能通信

3、root位置错误

文件位置：

/etc/nginx/conf.d

server {
listen       80;
server_name  localhost;

access_log  /var/log/nginx/log/host.access.log  main;
root   /usr/share/nginx/html;  #原本这个设置是在下面localtion里面的

location / {
index  index.php index.html index.htm;
}

error_page   500 502 503 504  /50x.html;
location = /50x.html {
root   /usr/share/nginx/html;
}

location ~* \.php$ {
fastcgi_index   index.php;
fastcgi_pass    127.0.0.1:9000;
include         fastcgi_params;
fastcgi_param   SCRIPT_FILENAME    $document_root$fastcgi_script_name;  #网上很多人说这个地方有的没配置，但是我是按照php官方的来配置的，就有这个
fastcgi_param   SCRIPT_NAME        $fastcgi_script_name;
}

}

nginx主配置文件：

user  www-data www-data;     #用户组，要和php-fpm里面一致
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
worker_connections  1024;
}

http {
include       /etc/nginx/mime.types;
default_type  application/octet-stream;

log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';

access_log  /var/log/nginx/access.log  main;

sendfile        on;
#tcp_nopush     on;

keepalive_timeout  65;

#gzip  on;

include /etc/nginx/conf.d/*.conf;   #注意看这里，引用虚拟机配置文件
}

就这样就成了。

虚拟主机也可以下面这样配置：

server{
listen 80;
server_name  localhost;
root         /usr/share/nginx/html;
index index.php;
location ~ .*.php?$ {
fastcgi_pass  127.0.0.1:9000;
fastcgi_index index.php;
include fastcgi.conf;
index index.php index.html;
}
if (!-e $request_filename) {
rewrite ^/(.*)$ /index.php?s=$1 last;
}
}

效果一样，但是这种可以配合框架使用。自动分理出模块控制器和方法。