Re: Second apache as fallback server

[Bob <bobnlinux@xxxxxxxxx>]

Dear John,

Thank you for sharing the ideas. Well, my servers are running with Linux. Hence haproxy with failover come closer to the requirement. As per the links you shared, seems  DNS route with two load balancing can do the job. four servers are required in total.

The challenge is to maintain unique web server log across the nodes. Any clue about that ?
Again for pages which send emails, all nodes must have running postfix with same domain.
I'm also wondering how to do that.

Thanks and regards,
Bob

On Monday 15 February 2016 01:32 PM, Meta Correio wrote:

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@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx>) 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

---------------------------------------------------------------------
To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx