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From Alfredo De Luca <alfredo.del...@gmail.com>
Subject Re: [users@httpd] Re: 2 web servers in load balancing
Date Wed, 18 Mar 2015 21:47:14 GMT
Thanks James. Really appreciated.

I am talking to an mySQL expert now for the best options for what we want
to achieve.

Thanks again


On Tue, Mar 17, 2015 at 7:19 PM, Dr James Smith <js5@sanger.ac.uk> wrote:

>  On 17/03/2015 07:59, Alfredo De Luca wrote:
>
> Hi all.
> Any clue on this?
> On 15/03/2015 9:30 PM, "Alfredo De Luca" <alfredo.deluca@gmail.com> wrote:
>
>> Hi all.
>> I ve never done this before so I am asking best practice/info/docs of
>> how to have 2 apache web servers in load balancing.
>>
>> - Which httpd module do I have to load in the http conf?
>>
>  Nothing unless you are using apache load balancer modules as a front end
> ... (mod_proxy_balancer)
>
>  - I was reading that I have to have a web load balancer on top of
>> them? Is it necessary? Can they accept requests from a cisco /F5 load
>>  balancer?
>>
>  I haven't played with F5 load balancers - but use the rival product
> Brocade/SteelApp/StingRay/Zeus
> traffic managers - which I think the F5s do the same thing as (just not as
> user friendly)
> so they should be able to do the job (I know we looked into it when we
> bought the ZTMs)
>
>  - What about persistent connection?
>>
>  ? HTTP is stateless - if you have poorly written backends which require
> requests to go the backend
> you should be able to use sticky sessions - but this is bad as you lose
> resilience (one of the main
> reason for load balancing backends!)
>
>  - Also we''ll have a mySQL server? Any more info about this?
>>
>  Load balancing MySQL can be trickier - easier if mainly RO connections
> (you can round robin requests
> to a large number of clones - or usually slaves to a single master) but
> harder if read/write
> - you can look at mysql cluster or master-master MySQL (galera)
>
> Read write you can use master + multiple slaves - but need to tag a
> process/session/user as
> requiring access to master if a write happens for an unspecified length of
> time!
>
>
>> Thanks in advance
>> --
>> Alfredo
>>
>
>
>
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-- 
*Alfredo*

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