Re: [Sks-devel] SKS Loadbalancing over DNS

[Kristian Fiskerstrand]

On 07/15/2017 01:34 PM, Kristian Fiskerstrand wrote:
> On 07/15/2017 11:39 AM, Moritz Wirth wrote:
>> Good morning everybody,
>>
>> is it possible to loadbalance SKS/Nginx using multiple A records for the
>> hostname?
> 
> The keyserver pools operate as such DNS Round Robins. I wouldn't
> generally recommend it for individual nameservers.
> 
> (i) If the servers are in physical proximity (same DC), you're better
> off with, in the case of nginx, usptream:
> https://blog.sumptuouscapital.com/2013/10/load-balancing-sks/
> 
> (ii) if the servers are in different datacenters; use separate hostnames
> to access the servers, using DNS RR for this will confuse monitoring of
> the server (e.g otherwise both servers will drop if crawler hits the
> down server, even if the other is operational, as there is no retry, as
> opposed to what you get from upstream module), it also would impact
> measuring for geographical pools etc.. so depending on level of
> weirdness, could result in exclusion from the pool.
> 

I should add that this goes for the individual servers and their
hostnames specified, there is of course nothing stopping using a third
domain name as a DNS round robin for two servers.

-- 
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Kristian Fiskerstrand
Blog: https://blog.sumptuouscapital.com
Twitter: @krifisk
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