如果主网站DNS管理器不是Route 53，则将ALIAS用于​​ELB [英] Using ALIAS for ELB if main website DNS manager is not Route 53

问题描述

我使用 Netlify 托管我的静态站点example.com.由于我不想附加www，因此必须使用Netlify的DNS名称服务器.

I use Netlify to host my static site example.com. Since I don't want to append www, I have to use Netlify's DNS nameservers.

example.com使用API​​后端api.example.com，这是一个CNAME记录，可解析为 ELB 地址*.elb.amazonaws.com.

example.com uses API backend api.example.com, which is a CNAME record that resolves to an ELB address *.elb.amazonaws.com.

因此需要2个DNS查找:首先到example.com，然后到*.elb.amazonaws.com.

So 2 DNS lookup is required: first to example.com then to *.elb.amazonaws.com.

替代: 使用另一个具有ALIAS记录api.example.org指向*.elb.amazonaws.com的自定义域example.org设置Route 53，并为example.com的API端点使用api.example.org而不是api.example.com查找example.com和api.example.org.

Alternative: Setup Route 53 with another custom domain example.org with an ALIAS record api.example.org that points to *.elb.amazonaws.com, and use api.example.org instead of api.example.com for example.com's API endpoints, then it'd have to look up example.com and api.example.org.

选择替代方案是否有性能优势?它们是否会相似，因为唯一的区别是必须查找api.example.org而不是*.elb.amazonaws.com?

Is there any performance advantage advantage choosing the alternative? Would they be similar since the only difference is it has to lookup api.example.org instead of *.elb.amazonaws.com?

推荐答案

别名记录优于CNAME记录，因为它们在解析后直接返回IP地址.

Alias records are better than CNAME records, because they return an IP address directly upon resolution.

示例1:

api.example.com作为*.elb.amazonaws.com

您的浏览器将首先解析example.com，下载HTML代码，然后在执行页面时，需要解析api.example.com.执行此操作时，它将:

Your browser will resolve example.com first, download the HTML code, then upon execution of the page, it will need to resolve api.example.com. When it does this, it will:

1. 接收CNAME结果，然后
2. 需要解决*.elb.amazonaws.com

因此，在上面，总共需要3种分辨率.

So in the above, there are a total of 3 resolutions required.

示例2:

api.example.org作为*.elb.amazonaws.com

您的浏览器将首先解析example.com，下载HTML代码，然后在执行页面时，将需要解析api.example.org.执行此操作时，它将:

Your browser will resolve example.com first, download the HTML code, then upon execution of the page, it will need to resolve api.example.org. When it does this, it will:

1. 直接接收A结果(IP地址)

因此，在上面，总共需要2种分辨率.

So in the above, there are a total of 2 resolutions required.

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