从这个组网可以看到 https://www.cnblogs.com/takemetoyourheart/p/12684018.html ， 我们需要在nginx上通过灰度策略， 使得部分测试用户可以访问到机房B，也就是灰度机房。
1、在nginx的vhost文件中
location = /reverse-proxy {
internal;
proxy_set_header Host www.xxx.com;
proxy_set_header X-Forwarded-For $http_x_forwarded_for;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Connection "";
proxy_http_version 1.1;
add_header X-Frame-Options "SAMEORIGIN";
set $verify_return_page $http_referer;
rewrite_by_lua_file '/opt/test/etc/lua/flow_control/access.lua';
set_by_lua_file $backend '/opt/test/etc/lua/grey/grey.lua' $backend;
proxy_pass http://${backend}${request_uri};
}
upstream.conf中设置的目的IP分成两种
upstream xx {
server 100.100.100.1:8443;
}
upstream xx-grey {
server 100.100.100.2:8443;
}
2、lua脚本
事先要定义grep.ip文件，把灰度的IP都加入进来,形如
10.10.10.1
10.10.10.2
源IP要看网站策略。如果用到CDN，那么就用CDN约定的源IP。否则就是remote_addr
local ipfile='/opt/test/etc/lua/grey/grey.ip'
ngx.shared.g_grey_ip:flush_all()
if ip == nil then
ip = ngx.var.remote_addr
end
if ip ~=nil and ngx.shared.g_grey_ip:get(ip) then
backend = backend..'-grey'
end
这样就实现了在nginx 内嵌入lua脚本，实现灰度IP访问灰度机房的策略。