nginx 502 bad gateway timeout
一朋友的nginx服务器网站打开不，出现502 bad gateway timeout。
同一台机机器上使用nginx做反向代理的服务可以正常访问。
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站点流量，机器负载都未出现异常，就是不能访问。
排查了一圈，日志也没异常。
偶然df -ah看了一下发现磁盘已经满了。
把没用的日志(du -ks *|sort -n 命令可以列出来文件间空使用情况并排序)清理一下，发现网站能正常访问了。
做个记号，给遇到同样问题的做个分析思路。