nginx 负载均衡

三台服务器

主 174 装 NGINX

从 170，191 装 PHP

三台服务器防火墙和 SELINUX 都已经关闭了

主服务器装好 Nginx 后，直接访问能看到欢迎页面

从服务器装好 php 后，直接用 PHP -S ip:port 启动，访问能看到正常页面

三台服务器的 /home/wwwroot 目录下分别有几个相同的测试文件

主服务器 174

nginx/conf.d/default.conf

upstream myServer{
    server 192.168.199.191:9000 max_fails=3 fail_timeout=10s;
    server 192.168.199.170:9000 max_fails=3 fail_timeout=10s;
}
server {
    listen       80;
    server_name  192.168.199.174;
    location / {
        root   /home/wwwroot;
        index  index.html index.htm;
    }
    location ~ \.php$ {
        root           /home/wwwroot;
        fastcgi_pass   myServer;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include        fastcgi_params;
    }
}

从服务器 170 191

/usr/local/etc/php-fpm.d/www.conf

[www]
; 担心是用户权限问题，所以把 nobody 改成了 root
; 用 php-fpm -R 启动
user = root
group = root

listen = [::]:9000
listen.allowed_clients = any
request_terminate_timeout = 0

但最终结果是：

2017/07/13 10:28:10 [error] 2199#2199: *10 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.199.222, server: 192.168.199.174, request: "GET /1.php HTTP/1.1", upstream: "fastcgi://192.168.199.191:9000", host: "192.168.199.174"
2017/07/13 10:28:10 [warn] 2199#2199: *10 upstream server temporarily disabled while reading response header from upstream, client: 192.168.199.222, server: 192.168.199.174, request: "GET /1.php HTTP/1.1", upstream: "fastcgi://192.168.199.191:9000", host: "192.168.199.174"
2017/07/13 10:28:10 [error] 2199#2199: *10 upstream prematurely closed connection while reading response header from upstream, client: 192.168.199.222, server: 192.168.199.174, request: "GET /1.php HTTP/1.1", upstream: "fastcgi://192.168.199.170:9000", host: "192.168.199.174"
2017/07/13 10:28:10 [warn] 2199#2199: *10 upstream server temporarily disabled while reading response header from upstream, client: 192.168.199.222, server: 192.168.199.174, request: "GET /1.php HTTP/1.1", upstream: "fastcgi://192.168.199.170:9000", host: "192.168.199.174"

求问，毛病出在那里？