PHP Warning: Module 'mysql' already loaded in Unknown on line 0

Question

我配置的是LNMP php 5.6 mysql 5.6 nginx 1.10

装的discuz 3.3版本

经常出现错误502

日志已经有19W条了。。。悲剧了。、

然后php日志里面的记录是下面的，麻烦看下这是哪方面的问题啊？

2017/10/23 13:20:02 [crit] 4475#4475: *2655306 connect() to unix:/tmp/php-cgi-skywen56-xzqnjdz.sock failed (2: No such file or directory) while connecting to upstream, client: 112.17.240.69, server: www.xzqnj.cn, request: "GET /forum.php?mod=image&aid=15167&size=800x400&key=934c18ca54fda6bd HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi-skywen56-xzqnjdz.sock:", host: "www.xzqnj.cn", referrer: "https://www.xzqnj.cn/plugin.php?id=xj_card"
2017/10/23 13:20:02 [crit] 4475#4475: *2655306 connect() to unix:/tmp/php-cgi-skywen56-xzqnjdz.sock failed (2: No such file or directory) while connecting to upstream, client: 112.17.240.69, server: www.xzqnj.cn, request: "GET /forum.php?mod=image&aid=15166&size=800x400&key=e093c86321976aaa HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi-skywen56-xzqnjdz.sock:", host: "www.xzqnj.cn", referrer: "https://www.xzqnj.cn/plugin.php?id=xj_card"
2017/10/23 13:20:02 [crit] 4475#4475: *2655306 connect() to unix:/tmp/php-cgi-skywen56-xzqnjdz.sock failed (2: No such file or directory) while connecting to upstream, client: 112.17.240.69, server: www.xzqnj.cn, request: "GET /forum.php?mod=image&aid=15318&size=800x400&key=2cef145c3094fb58 HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi-skywen56-xzqnjdz.sock:", host: "www.xzqnj.cn", referrer: "https://www.xzqnj.cn/plugin.php?id=xj_card"
2017/10/23 13:20:02 [crit] 4475#4475: *2655306 connect() to unix:/tmp/php-cgi-skywen56-xzqnjdz.sock failed (2: No such file or directory) while connecting to upstream, client: 112.17.240.69, server: www.xzqnj.cn, request: "GET /forum.php?mod=image&aid=15148&size=800x400&key=1ea62225dd4344d8 HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi-skywen56-xzqnjdz.sock:", host: "www.xzqnj.cn", referrer: "https://www.xzqnj.cn/plugin.php?id=xj_card"
2017/10/23 13:20:02 [crit] 4476#4476: *2655100 connect() to unix:/tmp/php-cgi-skywen56-xzqnjdz.sock failed (2: No such file or directory) while connecting to upstream, client: 112.17.240.69, server: www.xzqnj.cn, request: "GET /forum.php?mod=image&aid=15147&size=800x400&key=7c28af426bb77d09 HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-cgi-skywen56-xzqnjdz.sock:", host: "www.xzqnj.cn", referrer: "https://www.xzqnj.cn/plugin.php?id=xj_card"