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nginx 关闭一些图片的连接

tag-icon • tag-icon nginx web-server
nginx 关闭一些图片的连接

有问题nginx。它在客户端完成下载之前关闭连接。它看起来像：

 $ wget -O /dev/null http://www.site.com/images/theme/front/clean.jpg
--2012-07-11 21:37:03--  http://www.site.com/images/theme/front/clean.jpg
Resolving www.site.com (www.site.com)... 123.234.123.234
Connecting to www.site.com (www.site.com)|123.234.123.234|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 90707 (89K) [image/jpeg]
Saving to: `/dev/null'

26% [===============>                    ] 24,291      --.-K/s   in 8.7s    

2012-07-11 21:37:12 (2.74 KB/s) - Connection closed at byte 24291. Retrying.

--2012-07-11 21:37:13--  (try: 2)  http://www.site.com/images/theme/front/clean.jpg
Connecting to www.site.com (www.site.com)|123.234.123.234|:80... connected.
HTTP request sent, awaiting response... 206 Partial Content
Length: 90707 (89K), 66416 (65K) remaining [image/jpeg]
Saving to: `/dev/null'

53% [+++++++++++++++============>        ] 48,555      --.-K/s   in 8.7s    

2012-07-11 21:37:23 (2.74 KB/s) - Connection closed at byte 48555. Retrying.

--2012-07-11 21:37:25--  (try: 3)  http://www.site.com/images/theme/front/clean.jpg
Connecting to www.site.com (www.site.com)|123.234.123.234|:80... connected.
HTTP request sent, awaiting response... 206 Partial Content
Length: 90707 (89K), 42152 (41K) remaining [image/jpeg]
Saving to: `/dev/null'

100%[+++++++++++++++++++++++++++========>] 90,707      --.-K/s   in 0.1s    

2012-07-11 21:37:25 (311 KB/s) - `/dev/null' saved [90707/90707]

同时，对于较小的图像，一切正常：

 $ wget -O /dev/null http://www.site.com/images/theme/front/grease.jpg
--2012-07-11 21:41:28--  http://www.site.com/images/theme/front/grease.jpg
Resolving www.site.com (www.site.com)... 123.234.123.234
Connecting to www.site.com (www.site.com)|123.234.123.234|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 21404 (21K) [image/jpeg]
Saving to: `/dev/null'

100%[====================================>] 21,404      --.-K/s   in 0.07s   

2012-07-11 21:41:29 (316 KB/s) - `/dev/null' saved [21404/21404]

这就是这张图片在浏览器中无法完全显示的原因。我只能看到它的头部。

Nginx 配置为前端，apache 配置为后端。直接链接到 apache 运行良好，因此 nginx 存在问题。我说得对吗？

nginx配置：

user satellite;
worker_processes  1;

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

events {
    worker_connections  1024;
    multi_accept on;
}

http {
    include       /etc/nginx/mime.types;
    access_log  /var/log/nginx/access.log;

    sendfile        on;
    keepalive_timeout  0;
    tcp_nodelay        on;

    gzip  on;
    gzip_disable "MSIE [1-6]\.(?!.*SV1)";
    client_max_body_size 100m;

    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
    server {
            listen 123.234.123.234:80;
            server_name site.com www.site.com;
            location ~* ^/(admin/|dump/|webmail/|myadmin/|webim/) {
                    proxy_pass http://123.234.123.234:8080;
                    proxy_redirect http://site.com:8080/ /;
                    proxy_set_header Host $host;
                    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                    proxy_set_header X-Real-IP $remote_addr;
            }
            location / {
                    proxy_pass http://123.234.123.234:8080;
                    proxy_redirect http://site.com:8080/ /;
                    proxy_set_header Host $host;
                    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                    proxy_set_header X-Real-IP $remote_addr;
                    proxy_cache ino;
                    proxy_cache_valid 12h;
                    proxy_hide_header "Set-Cookie";
                    proxy_ignore_headers "Cache-Control" "Expires";
            }
            location ~* ^.+\.(jpg|swf|flv|ico|txt|jpeg|gif|png|svg|js|css|mp3|ogg|mpe?g|avi|zip|gz|bz2?|rar)$ {
                    access_log /home/satellite/logs/site.com.nginx.access.log;
                    error_page 404 = @fallback;
                    if ( $host ~* ^((.*).site.com)$ ) {
                            set $proot /home/satellite/www/$1;
                            break;
                    }
                    if ( $host = "www.site.com" ) {
                            break;
                    }
                    if ( $host = "site.com" ) {
                            break;
                    }

                    root /home/satellite/www/site.com;
            }
            location @fallback {
                    proxy_pass http://123.234.123.234:8080;
                    proxy_set_header Host $host;
                    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
                    proxy_set_header X-Real-IP $remote_addr;
            }
    }

我应该从哪里着手解决这个问题？

答案1

我忘了检查最重要的事情/var/log/nginx/error.log。

2012/07/12 08:46:44 [crit] 24074#0: *3 open() 
"/var/lib/nginx/proxy/1/00/0000000001" failed (13: Permission denied) 
while reading upstream, client: 109.173.96.30, server: site.com, request: 
"GET /images/theme/front/clean.jpg HTTP/1.1", upstream: 
"http://123.234.123.234:8080/images/theme/front/clean.jpg", 
host: "www.site.com", referrer: "http://www.google.com"

所以我修复了/var/lib/nginx/proxy/*目录权限（sudo chown -R www-data:www-data /var/lib/nginx/proxy/*），现在一切正常。感谢大家的帮助。

答案2

关闭连接的一个可能原因是连接速度较慢且时间较短keepalive_timeout。默认值为keepalive_timeout75 秒。如果时间太短，连接速度较慢，则可能会关闭得太早。

http {
    ..
    keepalive_timeout 75;
}

图像下载缓慢的原因之一是您的应用程序。如果您使用的是 Ruby-on-Rails 应用程序，并且资产管道与 Nginx 结合，则图像下载可能会很慢，因为您使用了错误的图像 URL（没有资产管道生成的指纹）。Rails 助手 asset_path 和 image_tag 会从带有指纹的文件生成正确的 URL，这些文件可以快速下载。

答案3

另一件需要检查的非常重要的事情是：确保还有剩余的磁盘空间！

对我来说，情况如下：

[user@server]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        30G   29G     0 100% /

对我来说，nginx 无法写入磁盘，最终导致同样的问题！希望它能帮助到别人！

答案4

检查lingering_timenginx.conf 中的值。默认情况下，该值设置为 30 秒。因此，nginx 将最多等待 30 秒，让客户端发送数据。

如果您正在上传或 POST 一个文件，这可能需要超过 30 秒才能完成，那么如果上传时间超过 30 秒，nginx 服务器将通过向客户端发送 RST 数据包来重置与客户端的连接。

为了让nginx等待更多的时间来监听客户端数据，则将该值设置为更高的值。

有关 lingering_time 的详细信息，请参见此处lingering_time

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