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The best: Intel. The price for a system is about 3/4 for a dell with similar
hardware, but all intel's hardware has drivers for Linux and not red hat
(wich began as linux and now is something like it).
Gaston Gorosterrazu
----- Original Message -----
From: <lvs@xxxxxxxxxxxx>
To: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Friday, April 02, 2004 9:24 AM
Subject: request for comments
> Hello list,
>
> I've been doing some reading on LVS and HA, and was wondering if
> people would mind giving me a sanity check on my plan?
>
> We currently have 2 machines working as a
>
> 1/- firewall, proxy cache and ssl engine
> 2/- dynamic webpage generation and database
>
> I need to expand the network to make it fully redundant, scalable
> and expand its capacity.
>
> My plan is to buy an additional 4 machines and arrange them as
> pairs in 3 tiers.
>
> Tier 1
> ------
>
> runs firewall, proxy cache, ssl engine and LVS director. The machines
> are connected with keepalived.
>
> I use mod_proxy for the proxy cache, and will use this to forward
> all non cached requests (ssl and non ssl) to a local port (say 8000).
>
> This port is handled by LVS director, and load balances the 2
> machines on tier 2.
>
> Tier 2
> ------
>
> 2 real servers run the dynamic web page generation software and
> nothing else. If a machine goes down then it seems to be easy to
> remove that machine from the list of realservers. And we can add
> more machines for times of predicted greater load.
>
> Tier 3
> ------
>
> 2 machines connected with keepalived and running mysqld. They
> will probably also be doing all the logging for the group, and
> possibly allowing a diskless boot of the first 2 tier machines
> (for easy maintenance).
>
> I have some questions regarding this setup.
>
> 1/- what is recommended to keep 2 machine's filesystems in sync? This
> is for the tier 3 database machines.
>
> 2/- I currently use NFS for exporting filesystems for logging
> or serving static content, but I've never been happy with its
> performance or reliability. Is there something else that people
> use in a production environment?
>
> 3/- Is my idea for the 1st tier machines possible? I want to run
> a proxy caching server because 70% of our throughput is images. I
> don't want to have a cache on each of the real servers, so putting
> it on the 1st tier machines seems like a good idea. I would just
> use a rule like this for apache:
>
> ProxyPass / local.safenet:8000
> ProxyPassReverse / local.safenet:8000
>
> And then use something like this for the LVS setup:
>
> ipvsadm -A -t 1.2.3.4:8000 -s rr
> ipvsadm -a -t 1.2.3.4:8000 -r 192.168.10.1:80 -m
> ipvsadm -a -t 1.2.3.4:8000 -r 192.168.10.2:80 -m
>
> Reasonable? Having said all that, maybe it would just be simpler to
> run the whole proxy caching and ssl stuff on the real servers. I've
> read some discussion on this in the docs (more related to hardware
> ssl) and people seem to say you may as well run it on the real
> servers for scalability.
>
> 4/- I'm in the UK and want to buy 1U rack machines from a supplier
> who builds machines for running linux. Our current machines are
> dell, but their linux support is so red hat centric that it is
> not much use to me. Anyone got recommendations for good hardware
> suppliers? Google isn't helping much!
>
> Your comments are greatly appreciated!
>
> Matt
>
> --
> If you want to bake an apple pie from scratch, you must first create
> the Universe.
> - Carl Sagan
>
> _______________________________________________
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