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容器技术交流»论坛首页 › LuManager 主机管理面板 › LuManager安装使用 › 按洞哥你的建议，改后继续 nginx 502 Bad Gateway ...
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按洞哥你的建议，改后继续 nginx 502 Bad Gateway

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hotviews
发表于 2009-9-1 15:17:26 | 显示全部楼层 |阅读模式
洞哥的意见如下

改/usr/local/nginx/conf/nginx.conf
中的
events {
    worker_connections  4096;
}
为
events {
    worker_connections  40960;
}
，然后重启webserver试一下


改后还是间断性出现502 Bad Gateway  。html面正常。

cpu占用不高。流理不大，服务器配置内存2G cpu是酷睿的。型号忘记了。

[ 本帖最后由 hotviews 于 2009-9-1 15:19 编辑 ]
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hotviews
 楼主| 发表于 2009-9-1 16:45:15 | 显示全部楼层
下面是错误日志。大家帮分析一下
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hotviews
 楼主| 发表于 2009-9-1 16:45:49 | 显示全部楼层
2009/09/01 06:42:35 [error] 3660#0: *435598 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=11774&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435600 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435602 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=11774&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435604 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435612 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=13995&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435614 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435616 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14062&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435618 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435620 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=568&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435622 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435624 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435625 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435626 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435630 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=2&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435632 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435634 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435636 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435638 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435640 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435642 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435644 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435646 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: bg8.cc, request: "GET /home/api/discuz.php?ac=feed&start=0&limit=12 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "www.bg8.cc"
2009/09/01 06:42:36 [error] 3657#0: *435648 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435650 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:37 [error] 3657#0: *435652 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 116.114.231.136, server: www.chgcw.com, request: "GET /areayy.php?areaid=95&catid=101&page=2 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.chgcw.com", referrer: "http://www.baidu.com/baidu?word=%B0%FC%CD%B7%B8%D8%B3%A6%D2%BD%D4%BA&tn=456net123_pg"
2009/09/01 06:42:56 [error] 3657#0: *435846 open() "/home/ftp/77hr_hr/wwwroot/thread-49993-1-1.html" failed (2: No such file or directory), client: 124.115.0.157, server: www.77hr.cc, request: "GET /thread-49993-1-1.html HTTP/1.1", host: "www.skyward.cn", referrer: "http://www.skyward.cn/thread-49993-1-1.html"
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hotviews
 楼主| 发表于 2009-9-1 16:46:22 | 显示全部楼层
2009/09/01 06:42:35 [error] 3660#0: *435598 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=11774&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435600 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435602 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=11774&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435604 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435612 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=13995&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435614 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14109&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435616 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14062&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435618 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435620 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=568&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3660#0: *435622 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435624 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435625 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:35 [error] 3657#0: *435626 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435630 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=2&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435632 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435634 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435636 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435638 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435640 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435642 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: uc.77hr.com, request: "GET /avatar.php?uid=14198&size=middle&type=virtual&check_file_exists=1&__times__=1 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "uc.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435644 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435646 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: bg8.cc, request: "GET /home/api/discuz.php?ac=feed&start=0&limit=12 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "www.bg8.cc"
2009/09/01 06:42:36 [error] 3657#0: *435648 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:36 [error] 3657#0: *435650 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 125.65.111.26, server: home.77hr.com, request: "GET /api/discuz.php?ac=space&order=updatetime&sc=DESC&start=0&limit=10 HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "home.77hr.com"
2009/09/01 06:42:37 [error] 3657#0: *435652 upstream timed out (60: Operation timed out) while reading response header from upstream, client: 116.114.231.136, server: www.chgcw.com, request: "GET /areayy.php?areaid=95&catid=101&page=2 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.chgcw.com", referrer: "http://www.baidu.com/baidu?word=%B0%FC%CD%B7%B8%D8%B3%A6%D2%BD%D4%BA&tn=456net123_pg"
2009/09/01 06:42:56 [error] 3657#0: *435846 open() "/home/ftp/77hr_hr/wwwroot/thread-49993-1-1.html" failed (2: No such file or directory), client: 124.115.0.157, server: www.77hr.cc, request: "GET /thread-49993-1-1.html HTTP/1.1", host: "www.skyward.cn", referrer: "http://www.skyward.cn/thread-49993-1-1.html"
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发表于 2009-9-1 16:55:43 | 显示全部楼层
你把/nginx-start中的28改成60，然后重启webserver试一下
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hnbbs
发表于 2009-9-1 17:41:15 | 显示全部楼层
[转]nginx中配置php fastcgi组解决莫名其妙的502 Bad Gateway错误[2009-08-24 21:33:30] 一般nginx搭配php都采用这样的方式：

location ~ \.php$ {
proxy_pass        http://localhost:9000;
fastcgi_param  SCRIPT_FILENAME  /data/_hongdou$fastcgi_script_name;
include        fastcgi_params;
}

这个方式只能连接到一组spawn-fcgi开启的fastcgi，在服务器负载稍高时常常出现502 bad gateway错误。

起先怀疑这是php-cgi的进程开得太少，增加后仍然有反映时常有错，偶然间发现php-cgi会报出这样的错误：

zend_mm_heap corrupted

看来是php-cgi在执行某些代码时有问题，以致于该线程中止。

在服务器上可能还会看到php-cgi进程在不断变少，估计是出现错误的php-cgi的进程自动退出了。

php的问题总是不太容易能解决，所以在nginx方面想想办法，nginx的好处是它总是能爆出一些稀奇古怪的做法出来。

在nginx的proxy中，规避莫名其妙错误的办法无非是proxy到一个upstream的服务器组中，然后配置proxy_next_upstream，让nginx遇到某种错误码时，自动跳到下一个后端上。这样，应用服务器即使不稳定，但是在nginx后面就变成了稳定服务。想到nginx的fastcgi和proxy是一路东西，所以proxy能用的经验，移植到fastcgi也能跑得起来。

照着这个思路，用spawn-fcgi多开同样一组php进程，所不同的仅仅是端口：

spawn-fcgi -a 127.0.0.1 -p 9000 -u nobody -f php-cgi -C 100
spawn-fcgi -a 127.0.0.1 -p 9001 -u nobody -f php-cgi -C 100

然后把fastcgi的这段配置改成用upstream的方式：

upstream backend {
server 127.0.0.1:9000;
server 127.0.0.1:9001;
}

location ~ \.php$ {
fastcgi_pass        backend;
fastcgi_param  SCRIPT_FILENAME  /data/_hongdou$fastcgi_script_name;
include        fastcgi_params;
}

检查配置结果正确，能跑起来；同时在服务器上netstat -n|grep 9000和grep 9001都有记录，证明连接无误；在前台查阅页面，一切运行正常。

这个配置是最简单的配置，既然能连接上upstream，那么很显然upstream的一些东西都可以拿来用，比如ip_hash、weight、max_fails等。

这样的配置在单机下不知能不能共享session，没有测试，如果有问题，可以加上ip_hash，或者配置php把session存进memcached中。

然后就是fastcgi_next_upstream的配置，nginx wiki中没有介绍到这个配置，查了一下，在nginx的CHANGES中有提到，而且出生年月是和proxy_next_upstream一样的。既然如此，那就照proxy_next_upstream一样配吧。一般按默认的值error timeout就可以工作，因为php出现502错误的异常是返回的500错误，所以我把fastcgi_next_upstream定为：

fastcgi_next_upstream error timeout invalid_header http_500;

通过这个配置，就可以基本杜绝任何时常性的500错误，出问题的几率会变小很多，如果客户反映仍然激烈，那么就多增加几组fastcgi进程。

以上配置能够杜绝由于php所引起的“莫名其妙”的时常性的502错误，同时可使nginx搭配php比从前方式更为强悍。假如nginx还是返回502错误，那这次就一定是出现服务器挂掉或其它严重问题的了。
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