Implementation of grayscale release with Nginx and Lua

yum install -y memcached
#Start the memcached service, port 11211, start as nobody, -d background mode to run memcached -p11211 -u nobody -d
#Set your own IP as the grayscale test IP
telnet 127.0.0.1 11211
set 119.32.216.122 0 0 1
1
quit

wget https://github.com/openresty/lua-resty-memcached/archive/v0.11.tar.gz
tar -zxvf v0.11.tar.gz
mkdir -p /usr/local/share/lua/5.1
cp -r lua-resty-memcached-0.11/lib/resty /usr/local/share/lua/5.1

clientIP = ngx.req.get_headers()["X-Real-IP"]
if clientIP == nil then
  clientIP = ngx.req.get_headers()["x_forwarded_for"]
end
if clientIP == nil then
  clientIP=ngx.var.remote_addr
end
  local memcached=require "resty.memcached"
  local memc,err=memcached:new()
  if not memc then
    ngx.say("failed to instantiate memc:",err)
    return
  end
  local ok,err =memc:connect("127.0.0.1",11211)
  if not ok then
    ngx.say("failed to connect:",err)
    return
  end
  local res,flags,err =memc:get(clientIP)
  --ngx.say("value key: ",res,clientIP)
  if err then
    ngx.say("failed to get clientIP",err)
    return
  end
  if res == "1" then
    ngx.exec("@server_test")
    return
  end
  ngx.exec("@server_product")

  server {
    listen 8867;
    server_name www.siguoya.name;
    root /usr/local/nginx/1.12.1/html;
    location / {
      content_by_lua_file /etc/nginx/test.lua;
    }
    location /hello {
      default_type text/plain;
      content_by_lua 'ngx.say("hello lua")';
    }
    location /ua
      default_type text/plain;
      content_by_lua '
        clientIP = ngx.req.get_headers()["USER-AGENT"]
        ngx.say("IP:",clientIP)
        ';
    }
    location @server_product {
      default_type text/plain;
      return 200 'product';
    }
    location @server_test {
      default_type text/plain;
      return 200 'test';
    }
  }