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记录一次客户nexus仓库拉包失败排错过程，404 images not found起初以为是没搭好nexus仓库，后来查日志404之前有1个403授权错误，抓包才发现403的前面还有1个407授权错误，最终定位是squid代理账号授权问题。
遇到一个Docker 报错，rpc error: code = 2 desc = oci runtime error: exec failed: container_linux.go:247: starting container process caused "process_linux.go:75: starting setns process caused \"fork/exec /proc/self/exe: no such file or directory\""，简单解决方法。