重启服务器后Docker容器暴露的端口外网突然访问不了!!
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github.com style (c) Vasily Polovnyov
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*/
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问题描述：
服务器内存不够了 需要加8G内存，加内存需要重启服务器，但是重启后Docker容器启动成功，端口也映射了，就是外网访问不了。
看了下容器是正常运行的端口也是映射成功的： 
给阿里云提工单
给阿里云提工单了，人家也不知道什么原因，建议我自己抓包排查！！哎。。。 
还是自己研究吧
google搜索了一下 关键字：docker 重启 端口映射失效
挑选了如下2篇文章看了下：
https://www.cnblogs.com/zl1991/p/10531726.html
摘要： 
摘要：
总结一下 上面2篇文章，关键字就是 iptables 服务 和 Docker的端口映射存在关联
- 第一步我检查下服务器的iptables服务
可以看出 iptables服务存在问题 居然关不了
- 这里我猜测：可能是因为重启服务器导致iptables发生问题，iptables 挂了 会影响Docker的端口映射
- 如何救活iptables服务
参考：https://stackoverflow.com/questions/24756240/how-can-i-use-iptables-on-centos-7
OK照着做救活了iptables服务
开启iptables服务试了下 没有问题
在iptables开启的状态下 尝试下访问 依然失败
重新把iptables关闭，尝试下访问 成功！！！！
总结：
如果之前Docker容器暴露的端口可以访问，当你重启服务器后，访问不了了。
检查下是否iptables服务正常，
如果出现类似： Failed to restart iptables.service: Unit not found. 的错误，那么就把iptables服务重装后再试试。我就是这么尝试成功了！！！
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