There are a couple of options described here that you could consider if you want to share your cache between NGINX instances:
https://www.nginx.com/blog/shared-caches-nginx-plus-cache-clusters-part-1/ https://www.nginx.com/blog/shared-caches-nginx-plus-cache-clusters-part-1/ describes a sharded cache approach, where you load-balance by URI across the NGINX cache servers. You can combine your front-end load balancers and back-end caches onto one tier to reduce your footprint if you wish
https://www.nginx.com/blog/shared-caches-nginx-plus-cache-clusters-part-2/ https://www.nginx.com/blog/shared-caches-nginx-plus-cache-clusters-part-2/ describes an alternative HA (shared) approach that replicates the cache so that there’s no increased load on the origin server if one cache server fails.
It’s not possible to share a cache across instances by using a shared filesystem (e.g. nfs).
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> On 7 Jul 2017, at 14:39, Peter Booth <peter_booth@me.com> wrote:
>
> You could do that but it would be bad. Nginx' great performance is based on serving files from a local Fisk and the behavior of a Linux page cache. If you serve from a shared (nfs) filsystem then every request is slower. You shouldn't slow down the common case just to increase cache hit rate.
>
> Sent from my iPhone
>
> On Jul 7, 2017, at 9:24 AM, Frank Dias <frank.dias@prodea.com <mailto:frank.dias@prodea.com>> wrote:
>
>> Have you thought about using a shared file system for the cache. This way all the nginx 's are looking at the same cached content.
>>
>> On Jul 7, 2017 5:30 AM, Joan Tomàs i Buliart <joan.tomas@marfeel.com <mailto:joan.tomas@marfeel.com>> wrote:
>> Hi Lucas
>>
>> On 07/07/17 12:12, Lucas Rolff wrote:
>> > Instead of doing round robin load balancing why not do a URI based
>> > load balancing? Then you ensure your cached file is only present on a
>> > single machine behind the load balancer.
>>
>> Yes, we considered this option but it forces us to deploy and maintain
>> another layer (LB+NG+AppServer). All cloud providers have round robin
>> load balancers out-of-the-box but no one provides URI based load
>> balancer. Moreover, in our scenario, our webservers layer is quite
>> dynamic due to scaling up/down.
>>
>> Best,
>>
>> Joan
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