Geographically distributed web server?

Question

CDN

Good afternoon.
There is a task to make sure that for residents of the western part of our vast site, the site is given from the western server, for residents of the eastern part - from the east. Tell me how to solve the problem of traffic distribution, while taking into account the possibility of one of the servers failing.

Answer 1

I will share my experience.
Background: Windows Azure in Asia, Europe and the US hosts the Composite C1 CMS start page - c1console.composite.net/C1/StartPage.aspx
Failover and traffic distribution needed to be provided.
At first they wanted to use www.geoscaling.com - they registered a smart subdomain, they wrote a script in php:
www.geoscaling.com/dns2/wiki/short_programming_guide_for_smart_subdomains (Return the closest server to the user) ...
a piece of test config:
$new_server['lat'] = 32.802955;
$new_server['lon'] = -96.769923;
$new_server['loc'] = "DOTNETPARK, UNITED STATES, TEXAS DALLAS";
$new_server['ip'] = "1.1.1.1"; // IP1
$servers[] = $new_server;
$new_server['lat'] = 50.45;
$new_server['lon'] = 30.523333;
$new_server['loc'] = "VOLIA ISP, Ukraine, Kyiv";
$new_server['ip'] = "1.1.1.1"; // IP2
$servers[] = $new_server;
$new_server['lat'] = 55.641486;
$new_server['lon'] = 12.080418;
$new_server['loc'] = "composite.net, Denmark, ROSKILDE";
$new_server['ip'] = "1.1.1.1"; // IP3
$servers[] = $new_server;
in the settings, the failover server is set, which will serve in case of failure.
Nuances:
1) wait about 5 minutes for the config to “pick up”
2) In the smarthost settings, you need to check “Share city info (country, city, latitude ...
3) each smart request with geodata costs a total of 3 credits. You are given a certain amount for free.
4) Information from a year ago - they gave 100k credits for free, those for 33k requests.
PS As a result, we used the native tools of Windows Azure.

Answer 2

Install a smart DNS server that will monitor both servers and, if one fails, transfer everyone to the remaining one.
And if no one fell, then on a territorial basis, throw it where necessary.
That's what I would do.

Answer 3

nginx+geoip