老师好，请教一个问题，我们通常为了使用更多的文件描述符在nginx.conf中配置如下：
worker_rlimit_nofile 131070; ##注意是65535的2倍！
我centos中/etc/security/limits.conf 文件中有如下的设置：
* soft nofile 65535
* hard nofile 65535

* soft nproc 65535
* hard nproc 65535
这样的话，一个nginx进程最多使用65535个文件描述符，
我在nginx.conf中加入的worker_rlimit_nofile 131070; 有效吗？
莫非真的能超过ulimit -n的限制?
还是为了使得worker_rlimit_nofile 131070; 有效，limits.conf中也要设置的不比该数值小？
谢谢！

老师，我在 upstream 所配置的服务器中返回加了 $remote_addr，可是每次返回的值都是 127.0.0.1，我的配置是这样的：
server {
    listen 8011;
    default_type text/plain;
    return 200 '8011 server response realip is $remote_addr $realip_remote_addr.\n';
}

server {
    listen 8012;
    default_type text/plain;
    return 200 '8012 server response realip is $remote_addr $realip_remote_addr .\n';
}

server {
    listen 80;
    set_real_ip_from 122.51.137.225; # 结合课程50，设置可信地址
    set_real_ip_from 127.0.0.1;
    real_ip_recursive on;
    real_ip_header X-Forwarded-For;
    error_log logs/myiphash.log info;
    access_log logs/upstream_access.log varups;

    location / {
        proxy_pass http://iphashs;
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }
}

执行路由：curl 127.0.0.1 -H "X-Forwarded-For:4.4.4.4"
返回：8011 server response realip is 127.0.0.1 127.0.0.1.

执行：curl 127.0.0.1:80 -H "X-Forwarded-For:120.88.88.88"
返回：8012 server response realip is 127.0.0.1 127.0.0.1 .

麻烦老师有空帮忙解答下

老师，我的iphash没有生效：
log_format varups '$upstream_addr $upstream_connect_time $upstream_header_time $upstream_response_time'
                        '$upstream_response_length $upstream_bytes_received '
                        '$upstream_status $upstream_http_server $upstream_cache_status';

upstream iphashups{
        ip_hash;
        server 127.0.0.1:8011 weight=2 max_conns=2 max_fails=2 fail_timeout=5;
        server 127.0.0.1:8012;
}

server{
        set_real_ip_from 221.239.129.176; #主机ip
        real_ip_recursive on;
        real_ip_header X-Forwarded-For;
        server_name rrups.hiroop.com;#在/etc/hosts有映射：127.0.0.1 rrups.hiroop.com
        error_log logs/iphash.log debug;
        access_log logs/upstream_access.log varups;

        location /{
                proxy_buffering off;
                proxy_pass http://iphashups;
                proxy_http_version 1.1;
                proxy_set_header Connection "";
        }
}

访问效果：
[root@linuxprobe conf]# curl -H 'X-Forwarded-For:100.200.200.100' rrups.hiroop.com
8012 server response
[root@linuxprobe conf]# curl -H 'X-Forwarded-For:100.200.200.100' rrups.hiroop.com
8011 server response
[root@linuxprobe conf]# curl -H 'X-Forwarded-For:100.200.200.100' rrups.hiroop.com
8011 server response
[root@linuxprobe conf]# curl -H 'X-Forwarded-For:100.200.200.100' rrups.hiroop.com
8012 server response
看日志文件logs/iphash.log和logs/upstream_access.log，是空的。为什么呢？？