What is the process of Nginx dynamic domain name resolution?

摘要

Nginx进行反向代理的时候会进行域名解析，把域名解析为具体IP后缓存在本地，如果域名对应的IP发生了改变，则会导致Nginx代理失效，下面使用Nginx的resolver指令来实现域名动态解析。

基于自定义DNS服务器动态解析

内网DNS服务器我使用的是dnsmasq

default.conf配置

server {
    listen       80;
    root         /usr/share/nginx/html/;
    resolver 192.168.137.110  valid=5s;
    set $proxy_url huzhihui.local;
    include /etc/nginx/default.d/*.conf;
    location / {
      index index.html index.htm;
      try_files $uri $uri/ /index.html;
      client_max_body_size  100m;
      add_header tenantId $arg_tenantId;
      add_header appId $arg_appId;
    }
    location /api/ {
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      rewrite /api/(.*) /$1 break;
      proxy_pass http://$proxy_url:8070;
    }
}

主要配置点

resolver：配置DNS服务器，和解析地址的有效期valid，

set：用来配合resolver做域名的IP地址解析

rewrite：对访问路径进行修改

proxy_pass：实际跳转到的代理服务，不要带路径参数，因为上面已经用rewrite重写了

启动访问

基于K8S的CoreDns动态域名解析

default.conf

server {
    listen       80;
    root         /usr/share/nginx/html/;
    resolver kube-dns.kube-system.svc.cluster.local  valid=10s;
    set $a_part_host a-part-http-service.huzhihui.svc.cluster.local;
    include /etc/nginx/default.d/*.conf;
    location / {
      index index.html index.htm;
      try_files $uri $uri/ /index.html;
      client_max_body_size  100m;
      add_header tenantId $arg_tenantId;
      add_header appId $arg_appId;
    }
    location /api/ {
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_pass http://127.0.0.1:5031/;
    }
	  location /a-part/ {
	    client_max_body_size  100m;
      proxy_set_header Host $http_host;
      proxy_set_header X-Real-IP $remote_addr;
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      proxy_set_header X-Forwarded-Proto $scheme;
      rewrite /a-part/(.*) /api/$1 break;
      proxy_pass http://$a_part_host;
    }
    location ~ .*\.(html)$ {
         #html disabled cache
         add_header Cache-Control no-store;
     }
    error_page 404 /404.html;
        location = /40x.html {
    }
    error_page 500 502 503 504 /50x.html;
        location = /50x.html {
    }
}

主要配置点

• kube-dns.kube-system.svc.cluster.local：这个域名是K8S DNS的域名

• a-part-http-service.huzhihui.svc.cluster.local：a-part-http-service是K8S定义的svc名称，huzhihui是我定义的namespaces，

做完上面的配置，svc重启后ip改变也不会导致反向代理失效了。

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