新加了一个域名出现499，无法访问
服务器上新绑定一个域名出现499错误，网站无法访问，但是用老域名可以访问，不知道是机房白名单问题还是nginx配置问题。求解！！ 首先我先google了半天499错误，得到的结果如下：499对应的是 “client has closed connection”。这很有可能是因为服务器端处理的时间过长，客户端“不耐烦”了。要解决此问题，就需要在程序上面做些优化了。
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http://www.blogkid.net/archives/2582.html
发现可能是程序的问题，然后开始查看网站日志跟mysql慢查询日志：
nginx网站日志：
218.244.176.75 - - "GET /api/uc.php?app=category_other_site&act=school&datatype=serialize&catid=0,10100,13161&limit=9 HTTP/1.1" 200 1034 "-" "PHP/5.2.9"
220.181.94.219 - - "GET /portal/courseListChangePage_305449_2.html HTTP/1.1" 302 203 "-" "Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)"
220.181.94.236 - - "GET /viewthread.php?tid=26192 HTTP/1.1" 302 203 "-" "Sogou web spider/4.0(+http://www.sogou.com/docs/help/webmasters.htm#07)"
211.151.93.14 - - "GET /caiwuguanli/407610/ HTTP/1.1" 499 0 "-" "-"
211.151.93.14 - - "GET /296059/ HTTP/1.1" 499 0 "-" "-"
211.151.93.14 - - "GET /renliziyuan/404515/ HTTP/1.1" 499 0 "-" "-"
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mysql慢查询日志：
# Time: 100327 12:48:40
# User@Host: master @
# Query_time: 0.629562Lock_time: 0.000109 Rows_sent: 5Rows_examined: 356982
SET timestamp=1269665320;
SELECT g.course_id,abs(is_lost-1) as is_lost FROM ***_goods_fields g LEFT JOIN ***_course c ON g.course_id=c.course_id LEFT JOIN ***_store s ON g.store_id=s.store_idWHERE c.status = 1 AND s.state =4GROUP BY g.course_idORDER BY s.sgrade_weight DESC,s.certification DESC,is_lost ASC,c.first DESC,c.update_date DESC limit 0,5;
# User@Host: master @
# Query_time: 0.006317Lock_time: 0.000029 Rows_sent: 1Rows_examined: 25318
SET timestamp=1269665320;
SELECT count(*) FROM ***_sessions WHERE expiry >=1269665320;
# Time: 100327 12:48:43
# User@Host: master @
# Query_time: 0.008097Lock_time: 0.000040 Rows_sent: 1Rows_examined: 25318
SET timestamp=1269665323;
SELECT count(*) FROM ***_sessions WHERE expiry >=1269665323;
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询问开发人员发现是session的表有问题，在每次baidu跟google等来抓取的时候，session经常出问题，找到问题就提交给开发人员去处理了！
哈哈，运维排错任务到此完成！
mysql开启慢查询参考：
http://bbs.linuxtone.org/viewthread.php?tid=199
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