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From Meta Correio <meta.corr...@gmail.com>
Subject Re: [users@httpd] Second apache as fallback server
Date Mon, 15 Feb 2016 13:32:20 GMT
Bob,

simple diagram for what you are looking for:

http://www.1stserv.com/images/Load-balancer-Setup1.png

And here is a more detailed document:

https://f5.com/resources/white-papers/load-balancing-101-nuts-and-bolts

If you're using MS Windows Server to host your Apache Servers you can look
into using Microsoft NLB. It's a low cost solution that works fine and does
not require any extra HW:

https://technet.microsoft.com/en-us/library/cc725691.aspx

About your questions:

>What can be done to assure the high-availability of the reverse proxy
itself ?

User redundant LBs or MS NLB.

>What about the latency if the master and hot standby located in two
different data center

I don't have that scenario so can't help you much with this question.
If you are looking into geographically distribute your application I would
suggest the DNS route:

https://www.digitalocean.com/community/tutorials/how-to-configure-dns-round-robin-load-balancing-for-high-availability

Cheers,

John

On Mon, Feb 15, 2016 at 9:33 AM, Bob <bobnlinux@gmail.com> wrote:

> Hello John,
>
> Could you please give me some more clue / pointers/ link ?
>
> Please allow me repeating my questions again
>
> What can be done to assure the high-availability of the reverse proxy
> itself ?
> What about the latency if the master and hot standby located in two
> different data center ?
>
>
>
>
> On Monday 15 February 2016 09:02 AM, Meta Correio wrote:
>
> We have it implemented using and external, redundant , load balancer.
> It really comes down to your budget.
>
> John
>
> On Mon, Feb 15, 2016 at 8:58 AM, Bob <bobnlinux@gmail.com> wrote:
>
>> Hello,
>>
>> Thanks for the valuable suggestions.
>>
>> What can be done to assure the high-availability of the reverse proxy
>> itself ?
>> What about the latency if the master and hot standby located in two
>> different data center ?
>>
>>
>>
>> On Sunday 14 February 2016 10:43 PM, Yehuda Katz wrote:
>>
>> We use three different methods:
>> 1. Content on NFS server
>> 2. Content auto-committing and auto-pulling over git about every 15
>> minutes
>> 3. Separate database server - with replication for backup.
>>
>> - Y
>>
>> Sent from a device with a very small keyboard and hyperactive autocorrect.
>> On Feb 14, 2016 5:28 PM, "Rose, John B" <jbrose@utk.edu> wrote:
>>
>>> What is your preferred approach to keeping content in sync?
>>>
>>> Sent from my iPad
>>>
>>> On Feb 14, 2016, at 3:47 PM, Daniel < <dferradal@gmail.com>
>>> dferradal@gmail.com> wrote:
>>>
>>> with a reverse proxy in front of both, you use balancer setup specifying
>>> the second web server as hot standby
>>>
>>> El dom., 14 feb. 2016 a las 16:49, Bob (< <bobnlinux@gmail.com>
>>> bobnlinux@gmail.com>) escribió:
>>>
>>>> Hello list,
>>>>
>>>> I have two servers. One is already up with apache, mysql etc..
>>>> Now I wonder if I can configure the second server as a fallback web
>>>> server.
>>>> The idea is.. if first web server is down , the second one will serve
>>>> the requests.
>>>>
>>>> Any suggestion / idea is very much welcome.
>>>>
>>>> Thanks and regards,
>>>> Bob
>>>>
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>>
>
>

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