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DNS查找失败是错误网络流量的属性

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适用场景

  • StorageGRID
  • NTP

问题描述

  • StorageGRID节点使用网络时间协议(Network Time Protocol、NTP)同步网格内的时间。StorageGRID的每个站点至少有两台服务器指定为主NTP时间服务器、一个管理节点和一个主网关节点(不是每个网关节点都应设置为主NTP时间源)。这两台服务器必须至少与4个外部"一层"时间源同步。StorageGRID中的所有其他服务器都会将其时间与StorageGRID中的主NTP源(即上述两个服务器)同步。
  • 按照设计、NTP会通过问题描述反向DNS查找来解析IP地址。反向DNS查找是指在IP地址已知时对DNS查询域名。DNS将IP地址以域名的形式存储为基础架构顶级域中指针(PTR)记录中的特殊格式名称。
  • 在问题描述中、NTP客户端将以  反向DNS查找的形式查询ntp.conf 文件中列出的NTP源。如果DNS解析配置不当、或者DNS PTR记录配置不正确、或者无法解析 ntp.conf  文件(StorageGRID节点)中的地址、则NTP客户端将永久重试以解析 ntp.conf  文件中列出的地址。这样会增加不必要的网络流量、并可能导致DNS服务器停机。  如果DNS配置不正确、则NTP客户端解析其时间源的方式会产生这种"对话"的负面影响。

 

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