OpenResty Edge can be used directly as an authoritative DNS server. In this tutorial, you will learn how to OpenResty Edge Configure DNS records and geographical location based DNS dispatching rules in.

Add DNS record

Let's go OpenResty Edge Admin Web Console for. This is a sample deployment of our console. Each user has its own local deployment.

Enter the DNS application management interface.

Click the "openresty.net" application to see how the DNS application is configured in actual use.

First, you can see the DNS record map, which visually shows the resolution of different regions.

You can select different sub domains here.

The map can be turned on or off through this switch.

After clicking Add DNS Record, a new line of records will appear in the list.

You can select the type of record.

Enter the sub domain name of the record, such as "blog".

You can limit that only specific client addresses can be resolved to this record.

"Any" means no restriction.

Limit by CIDR.

For example, 192.168.1.1/24.

You can also limit the region, such as "Singapore".

Here we do not impose restrictions.

Here is the resolution result. You can enter the IP address directly.

You can also select the gateway cluster of Edge.

For example, "aws london".

This is the expiration time of the record.

You can select different units.

This is the switch of active and standby records. When there is no active record or the health check of the active record fails, the standby record will be used.

At the same time, Edge also supports health check of DNS records to avoid returning unavailable results.

Click "Add" after configuration.

Test DNS records

Next, let's look at the IP address of the network node in the DNS record just configured.

You can see that the IP address ends with. 240.

Then use the dig command to query DNS.

You can see that the IP address of the gateway node in the gateway cluster we just selected is returned.

When multiple results need to be returned, multiple DNS records can be added.

Click the "Add" button again.

Enter the domain name "blog".

Select another gateway cluster "aws us east".

Click to add this record.

Now there are two DNS records about "blog. openrest. net".

Then go to the "Gateway Cluster" interface again and check the IP address of the "aws us east" gateway cluster.

This IP address ends with. 84.

Then use the "dig" command again to query.

As you can see, the result is correct.

You do not need to manually create all DNS records. Click this button to automatically generate a DNS scheme based on geographical location.

Configure authoritative DNS server

Next, continue to introduce DNS configuration.

Select Authoritative DNS Servers.

The configuration here is the result of SOA records.

Then we take Google Domains as an example to demonstrate how to resolve DNS domain name servers to Edge.

Select the DNS tab.

Select Global DNS settings.

Add glue record and enter the domain name and IP address of the Edge Node.

Return to the previous page.

Then select Custom name servers.

Click "manage name servers"

Enter the domain name previously configured in "Global DNS Settings"

Finally, click this button to switch to the customized domain name server.

You have successfully configured Google Domains

Let's return to the Edge Admin interface to continue introducing DNS configuration.

This "User Group" is used for access control.

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About the author

Zhang Yichun is open source OpenResty ^® Project founder and OpenResty Inc. CEO and founder of the company.

Zhang Yichun (Github ID: agentzh) was born in Jiangsu, China, and now lives in the U.S. Bay Area. He was an advocate and leader of China's early open source technology and culture, and once worked for many internationally renowned high-tech enterprises, such as Cloudflare Yahoo, Alibaba, the pioneer of "edge computing", "dynamic tracking" and "machine programming", has more than 22 years of programming and 16 years of open source experience. As the leader of open source projects with more than 40 million global domain name users, he OpenResty ^® High tech enterprises created by open source projects OpenResty Inc. It is located in the center of Silicon Valley in the United States. Its two main products OpenResty XRay (Utilize Dynamic tracking Technology) and OpenResty Edge (The all-purpose gateway software most suitable for microservices and distributed traffic), widely favored by many listed and large enterprises worldwide. Besides OpenResty, Zhang Yichun has contributed more than one million lines of code to many open source projects, including Linux kernel, Nginx LuaJIT 、 GDB 、 SystemTap 、 LLVM , Perl, etc., and has written more than 60 open source software libraries.

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