Shulou(Shulou.com)06/02 Report--

The update of this article dragged on for half a month, which really touched China.

Nginx caches DNS by default. As we all know, if you do reverse proxy, it is actually the target ip of access, so once the target ip is cached, it will be very troublesome.

The four ways of writing anise are well known, never thought that Nginx dynamic DNS reverse proxy also has N kinds of play, which mainly depends on the version of Nginx you use, of course, the operation tells me that it is best not to use dynamic DNS, but based on business needs, we have no way.

The first way to write the word: Nginx

In Nginx, you can save the country by setting variables. Of course, there are disadvantages. There is no way to perform Load Balancer through variable methods. It is very troublesome. Of course, if you only have a single machine (almost non-existent in actual business scenarios), you can still try it:

server { ... resolver 127.0.0.1; set $backend "http://dynamic.example.com:80"; proxy_pass $backend; ...}

The second is Nginx Plus.

Of course, Nginx is not very easy to use, the enhanced version of Plus provides a better way to write, it supports writing in the server:

server { ... resolver 127.0.0.1 valid=30s; proxy_pass http://upstream-sites; ...}

The third word: engine

Tengine is Taobao's magic to Nginx, in fact, I am very annoying, because at first I do not know we use Tengine, resulting in configuration of no eggs, but Tengine for dynamic domain name resolution support is very good, the official documentation is also very clear.

upstream backend { dynamic_resolve fallback=stale fail_timeout=30s; server a.com; server b.com;}server { ... location / { proxy_pass http://backend; }}

other

Of course, you can also use Lua script to implement, or someone else's module, but considering the fear of tampering, I still don't mess around, so I didn't take this solution.

reference

ngx_http_upstream_dynamic_module - Tengine

Using DNS for Service Discovery with NGINX and NGINX Plus

The above is all the content of this article, I hope to help everyone's study, but also hope that everyone a lot of support.

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