Nginx+tomcat负载均衡配置

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Nginx 介绍

Nginx (发音同 engine x)是一款轻量级的Web 服务器/反向代理服务器及电子邮件(IMAP/POP3)代理服务器,并在一个BSD-like 协议下发行。  其特点是占有内存少,并发能力强,事实上nginx的并发能力确实在同类型的网页伺服器中表现较好.

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nginx:502 Bad Gateway

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有时候服务器重启后,再打开网站会出现502 Bad Gateway的错误,然后使用命令:

netstat -anpo | grep “php-cgi” | wc -l查看php-cgi进程数,发现是0,这种情况下往往是php-fpm没有启动起来(没有随系统重启而启动),可以进入到/usr/local/php/sbin,运行命令:./php-fpm start,如果启动无误会显示提示:Starting php_fpm  done。

再次访问网站,错误便没有了,网站也正常了。

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Nginx中wordpress固定/永久链接404问题

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在后台设置Wordpress文章固定链接形式,可以使得我们文章的链接看上去更友好,通常情况下,我们只需在后台设置一下我们所需要的固定链接形式即可,但有时,特别是我们更换博客空间,比如将博客迁移到VPS或独立服务器上,那么此时就需要我们自己来使得这种固定链接形式在后台设置后能生效,但不幸的是,很多时候我们刚开始的时候都会碰到页面打开404的错误。

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Linux环境下安装Nginx+Pcre+OpenSSL

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Nginx是一款非常优秀的Web服务器,它是由俄罗斯人Igor Sysoev(伊戈尔-塞索耶夫)写的,虽然它的应用还没有老牌Web服务器Apache广泛,但相比Apache,它有着自己的一些优势,比如很好的高并发访问支持内存却占用少,配置简单,稳定性高,支持热部署等等。

Nginx 已经在俄罗斯的最大的门户网站Rambler Media上运行了好几年的时间,在国内也有很多一些知名网站也采用Nginx作为Web服务器或反向代理服务器,比如新浪、网易、空中网等等。

在这里,我记录一下安装Nginx的过程,因为Nginx需要其他第三方库的支持,比如rewrite模块需要pcre库,ssl需要openssl库,所以也一并介绍了一下其他库,主要是pcre和openssl库的安装说明。

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