domain-name-system – 什么是Amazon Route53“Alias”DNS记录？_html-js-css

概述AWS Route53别名值考虑在AWS Route53上注册的域.应从AWS CloudFront CDN分发中提供对此域的HTTP请求.为了实现这一点,定义了别名A记录：挖掘结果但是,挖掘结果显示实际的IP地址.实际上,这些IP地址不是恒定的,而是随时间变化的： # dig @1.1.1.1 serverlessdaystlv.io...;; ANSWER SECTION:se AWS Route53别名值

考虑在AWS Route53上注册的域.应从AWS CloudFront CDN分发中提供对此域的http请求.为了实现这一点,定义了别名A记录：@H_419_3@

@H_419_3@

挖掘结果@H_419_3@

但是,挖掘结果显示实际的IP地址.实际上,这些IP地址不是恒定的,而是随时间变化的：@H_419_3@

# dig @1.1.1.1 serverlessdaystlv.io...;; ANSWER SECTION:serverlessdaystlv.io.   60      IN      A       13.32.67.21serverlessdaystlv.io.   60      IN      A       13.32.67.27serverlessdaystlv.io.   60      IN      A       13.32.67.97serverlessdaystlv.io.   60      IN      A       13.32.67.122serverlessdaystlv.io.   60      IN      A       13.32.67.141serverlessdaystlv.io.   60      IN      A       13.32.67.159serverlessdaystlv.io.   60      IN      A       13.32.67.201serverlessdaystlv.io.   60      IN      A       13.32.67.216# dig @1.1.1.1 serverlessdaystlv.io...;; ANSWER SECTION:serverlessdaystlv.io.   60      IN      A       52.222.232.13serverlessdaystlv.io.   60      IN      A       52.222.232.24serverlessdaystlv.io.   60      IN      A       52.222.232.43serverlessdaystlv.io.   60      IN      A       52.222.232.55serverlessdaystlv.io.   60      IN      A       52.222.232.63serverlessdaystlv.io.   60      IN      A       52.222.232.104serverlessdaystlv.io.   60      IN      A       52.222.232.136serverlessdaystlv.io.   60      IN      A       52.222.232.224

我的问题@H_419_3@

什么是Route53别名记录？它是内置类型的DNS记录,还是仅用于CloudFront分配的实际IP的内部AWS别名,从不暴露给外部？@H_419_3@解决方法 Route53别名记录是与DNS协议 record types分开的自己的概念：例如A是地址记录,Cname是规范名称记录. Cname就像一个指向规范名称的别名,而A与别名无关. (见 RFC 1035.)

别名记录是在更高级别上工作的内部Amazon特定指针;在技术DNS级别,它可能会导致A或Cname,具体取决于具体情况. DNS不需要知道这个内部指针类型也不需要知道目标,因为Route53只回答结果记录.@H_419_3@

亚马逊文章Choosing Between Alias and Non-Alias Records详细解释了这一点：@H_419_3@

Alias records provIDe a Route 53–specific extension to DNS
functionality. Instead of an IP address or a domain name,an alias
record contains a pointer to a CloudFront distribution,an Elastic
Beanstalk environment,an ELB Classic,Application,or Network Load
Balancer,an Amazon S3 bucket that is configured as a static website,
or another Route 53 record in the same hosted zone. When Route 53
receives a DNS query that matches the name and type in an alias
record,Route 53 follows the pointer and responds with the applicable
value:@H_419_3@
An alternate domain name for a CloudFront distribution – Route 53 responds as if the query had asked for the CloudFront distribution by
using the CloudFront domain name,such as
d111111abcdef8.cloudfront.net.@H_419_3@
An Elastic Beanstalk environment – Route 53 responds to each request with one or more IP addresses for the environment.@H_419_3@
An ELB load balancer – Route 53 responds to each request with one or more IP addresses for the load balancer.@H_419_3@
An Amazon S3 bucket that is configured as a static website – Route 53 responds to each request with one IP address for the Amazon S3 bucket.@H_419_3@
Another Route 53 record in the same hosted zone – Route 53 responds as if the query had asked for the record that is
referenced by the pointer.@H_419_3@