服务器总是502，但是探针显示负载并不高
最近服务器总是出现502，特别是登录后台情况下。前天刚重装系统，及环境，网站上线，发现总体情况很好，登录后台也没事。昨天太忙没时间 管，今天上去，发现又出现502。
vi wwwlogs/access/log
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645963&_=1490600457405 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
219.159.230.131 - - "GET /youlian/ltyl.gif HTTP/1.1" 301 178 "http://www.zxls.com/" "Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko" -
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645964&_=1490600459417 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
219.137.174.166 - - "GET /youlian/ltyl.gif HTTP/1.1" 301 178 "http://www.zxls.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)" -
222.173.168.46 - - "GET /youlian/ltyl.gif HTTP/1.1" 301 178 "http://www.zxls.com/" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; GTB7.5; .NET CLR 1.1.4322; .NET CLR 2.0.50727)" -
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645965&_=1490600461417 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645966&_=1490600463414 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
94.23.23.194 - - "GET / HTTP/1.1" 301 178 "http://www.aaaaaaaaaa.com" "Mozilla/4.0 (compatible; MSIE 9.0; Windows NT 6.1)" -
222.209.210.179 - - "GET /youlian/ltyl.gif HTTP/1.1" 301 178 "http://www.zxls.com/" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.154 Safari/537.36 LBBROWSER" -
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645967&_=1490600465405 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
14.220.228.225 - - "GET /p.php?act=rt&callback=jQuery17019214045155609605_1490589645968&_=1490600467409 HTTP/1.1" 404 564 "http://111.111.111.111/p.php" "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36"
注：该段时间内，我已经将探针所在默认虚机停了——则将根目录改变名称，但仍发现有许多异常连接。
vi wwwlogs/nginx_error.log
2017/03/27 15:38:01 12608#0: *103039 connect() to unix:/tmp/php-cgi.sock failed (2: No such file or directory) while connecting to upstream, client: 164.132.161.74, server: guoxuesg.com, request: "GET /modules/article/addbookcase.php?bid=129881&cid=5079817 HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi.sock:", host: "guoxuesg.com"
PROFILE: interrupts/evictions/bytes = 4563/588/343208
PROFILE: interrupts/evictions/bytes = 4559/525/338096
2017/03/27 15:40:31 4561#0: *7 connect() to unix:/tmp/php-cgi.sock failed (2: No such file or directory) while connecting to upstream, client: 123.126.113.82, server: www.aaaaaaaaaa.com, request: "GET /article-9530.html HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi.sock:", host: "www.aaaaaaaaaa.com"
2017/03/27 15:46:02 4560#0: *394 connect() to unix:/tmp/php-cgi.sock failed (2: No such file or directory) while connecting to upstream, client: 123.126.113.82, server: www.aaaaaaaaaa.com, request: "GET /article-3780.html HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi.sock:", host: "www.aaaaaaaaaa.com"
2017/03/27 15:47:02 4561#0: *458 connect() to unix:/tmp/php-cgi.sock failed (2: No such file or directory) while connecting to upstream, client: 123.126.113.82, server: www.aaaaaaaaaa.com, request: "GET /article-7017.html HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi.sock:", host: "www.aaaaaaaaaa.com"
2017/03/27 15:48:02 4561#0: *530 connect() to unix:/tmp/php-cgi.sock failed (2: No such file or directory) while connecting to upstream, client: 123.126.113.82, server: www.aaaaaaaaaa.com, request: "GET /docswf_wk-view.html?docid=27 HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi.sock:", host: "www.aaaaaaaaaa.com" 哪个是异常连接？
上面的是访问日志和nginx错误日志，这些在发生502时没用处，置顶帖中已经给出了具体可能的原因及排查方法
也可以直接去开php慢日志看看哪行程序执行有问题 昨日开启慢日志，但是vi/usr/local/php/var/log/slow.log
内容为空
vi/usr/local/php/var/log/php-fpm.log:
NOTICE: exiting, bye-bye!
NOTICE: fpm is running, pid 5546
NOTICE: ready to handle connections
NOTICE: Finishing ...
NOTICE: exiting, bye-bye!
NOTICE: fpm is running, pid 5571
NOTICE: ready to handle connections
NOTICE: Finishing ...
NOTICE: exiting, bye-bye!
NOTICE: fpm is running, pid 5603
NOTICE: ready to handle connections
NOTICE: Finishing ...
NOTICE: exiting, bye-bye!
NOTICE: fpm is running, pid 5662
NOTICE: ready to handle connections
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