[GTALUG] Apache Traffic Server HA

[David Collier-Brown]

Try to separate your concerns as much as possible, as you describe, and 
avoid programs that want to do everything for you.

For example, I happily use nginx for all sorts of simple things, but if 
you try to make it be a reverse-proxy, a cache and and an HA mechanism 
at the same time, you will find yourself like a customer of mine, madly 
trying to figure out what options interacted to send the Akamai budget 
through the roof (;-))

--dave


On 21/12/17 01:15 PM, Alvin Starr via talk wrote:
> On 12/21/2017 12:30 PM, o1bigtenor via talk wrote:
>>
>>
>> On Thu, Dec 21, 2017 at 9:21 AM, Greg Martyn via talk 
>> <talk at gtalug.org <mailto:talk at gtalug.org>> wrote:
>>
>>
>>     Has anyone run Apache Traffic Server in production? I've used it
>>     for a proof-of-concept before, and I like it overall, but I'm
>>     about to recommend its use and would like to hear any horror
>>     stories.
>>
>>     I'm planning on using it as a reverse proxy cache for a site that
>>     is expected to have a couple tens of thousands of active users at
>>     peak. I'd have HAProxy in front for HA, with a mirror setup of
>>     everything below it, talking to ATS, with another HAProxy behind
>>     ATS for load balancing the origin servers.
>>
>>     Any comments welcome.
>>
>>
>> Most definitely NOT speaking as an expert but in my perambulations 
>> around the web I have found mention of using nginx WITH apache2 
>> specifically in some kind of a reverse proxy cache system/mode.
>>
>> https://www.digitalocean.com/community/tutorials/how-to-configure-nginx-as-a-reverse-proxy-for-apache
>>
>> https://serverfault.com/questions/30705/how-to-set-up-nginx-as-a-caching-reverse-proxy
>>    seems to have a fair amount of suggestions
>>
>> https://www.nginx.com/resources/wiki/start/topics/examples/reverseproxycachingexample/
>>
>> https://guides.wp-bullet.com/how-to-configure-nginx-reverse-proxy-wordpress-cache-apache/ 
>>
>>    lots of setup stuff available here
>>
>> I was using
>>
>> nginx + apache2 + reverse proxy cache
>>    in duckduck
>>
>> apache2 + reverse proxy cache
>>    seems to offer less proposals than the previous
>>
>> Perhaps this coupling would work for you.
>>
>>
>
> To add another data point I have used squid as a reverse proxy on a 
> couple of high traffic project over the years.
>
> I wonder about caching and if there is a gain when you have multiple 
> back end servers.
> If your caching proxy server pushes the data out to a disk cache then 
> it may not be much faster than getting the data from the directly 
> connected web server.
> The proxy server is a operating off a single disk for that data where 
> N web servers are operating off of N disks.
>
> One of the things to be said for a simple non-caching proxy like 
> HAProxy is that it is small and fast.
> As soon as you start caching you need to handle lots of corner cases 
> like what to do with requests with big results.
>
>
> -- 
> Alvin Starr                   ||   land:  (905)513-7688
> Netvel Inc.                   ||   Cell:  (416)806-0133
> alvin at netvel.net               ||
>
>
>
> ---
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-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb at spamcop.net           |                      -- Mark Twain

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