亚马逊ec2实例无法解析主机 [英] amazon ec2 instance unable to resolve host

问题描述

我有一堆亚马逊ec2实例。今天，没有理由我可以确定，其中三个无法解决一个具体的网址。当我尝试 curl< url> 时，这三个实例说curl：（6）无法解析主机，而所有其他实例能够解析url和返回正确的数据。这只是特定的网址，以及所有其他网址工作正常。

I have a bunch of amazon ec2 instances. Today, for no reason I can determine, three of them became unable to resolve a specific url. When I try curl <url>, those three instances say "curl: (6) Could not resolve host", while all the other instances are able to resolve the url and return the correct data. It's only that specific url, as well - all other urls work fine.

这可能是什么原因造成的？我没有改变任何实例上的任何东西，所以这不是我做的。

What could have caused this? I haven't changed anything on any of the instances, so it's not something I did. How do I find out why it happened?

推荐答案

如果您不使用默认VPC或由VPC向导中，您需要确保已启用 DNS主机名和 DNS解析选项。

If you’re not using the default VPC, or a VPC created by the VPC wizard, you’ll need to make sure that the DNS hostname and DNS resolution options are enabled.

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