I am having vitural hosting around three websites using Centos.

I need to type in the full domain name include www to enter the 2 of the vitural hosting sites.

Does anyone have any advice or guidance about the Pros and Cons of vitural hosting vs separate machine?

I got a questions about static IP. Assume I having a linksys router with port forwarding function, I have three seperate machines with different private address connect to the same linksys router. Can I entry all private address forward to port 80? Does it work?

If I insist to host website on three machines, does that mean I need 3 static IP and 3 linksys router?

I got two conventional web services only showing information but one got mysql db for user to input data, thats why I asking if it is good idea to seperate web page on different machines.

As long as you aren't going to over load the server then virtual hosting is a no brainer. Using extra hardware in lieu of 8 lines of code would never make any sense on conventional web services. There are exceptions, but you'd already know if you were such an exception I'd wager.

Cost: It's going to be far more expensive to buy and run three separate systems working at, say, 20% loading than one system Virtual hosting at 60%.

However, with one system you have a single point of failure; If the system develops a hardware fault, you could loose all three virtual systems.

The probability of this happening is fairly low if the system has been running fine for some time. You've no doubt got RAIDed, hot swap disks which increases reliability (Disks, with moving parts, are the most likely things to fail)

If you had two systems which shared the disks you could have the VMs fail over to the second system in the event of a fault (OK, OK, so I'm now getting outside my feeble understanding of DR and Clustering but I reckon it can be done some how. I'm sure I've heard of Dynamic VM migration working in this scenario.)

My

Play Bonny!

He means, I think, virtualhosts in apache, not virtual machines.

for generic websites almost all HostServiceProvides use one-pc-many-sites config. In other words one hardware run one web server, which in case serve many sites that on it's hdd.
term "virtual hosting" or to be more precise "virtual hardware server" refer to virtualization technology where real hardware split itself via software to many sandboxed mini configurations(e.g. 1xCPU 3000=10xCPU 300). This is like you rent a flat in hightower.

+ in renting full separate web server(or collocation) is:
your own system configuration
increased security(it's not secret that most webcracks is done on one site and then affect others on one server).
more processing power.
better hardware life(we assume that it be reduced load due to less projects hosted)

Again, I'm pretty sure that's not the type of "virtual" he means.

nevermind.

I got a questions about static IP. Assume I having a linksys router with port forwarding function, I have three seperate machines with different private address connect to the same linksys router. Can I entry all private address forward to port 80? Does it work?

If I insist to host website on three machines, does that mean I need 3 static IP and 3 linksys router?

I got two conventional web services only showing information but one got mysql db for user to input data, thats why I asking if it is good idea to seperate web page on different machines.

@ Chris
It didn't come across as a Virtual hosting in Apache question. Looked like a single virtual host box versus three free standing boxes. (You may have guessed at this point that I'm from the hardware side of the Force )

Play Bonny!

WHat do you mean "nevermind"??? you have your own question, go start your own thread, don't hijack someone elses.

second part of answer still apply

I got a questions about static IP. Assume I having a linksys router with port forwarding function, I have three seperate machines with different private address connect to the same linksys router. Can I entry all private address forward to port 80? Does it work?

If I insist to host website on three machines, does that mean I need 3 static IP and 3 linksys router?

I got two conventional web services only showing information but one got mysql db for user to input data, thats why I asking if it is good idea to seperate web page on different machines.

hmm in theory you should use something like this (on linksys router or PC based-gateway):
www.site1.com <r/g> site1.local_server1:80 or other port
www.site2.com <r/g> site1.local_server2:80 or other port

multiple use port 80 on router/gateway should be fine.
Problem is can you add rule for port forwarding and dns name on r/g?

Parsing this, I see: CentOS, 3 web sites, Virtual hosting

First, Apache on one machine can handle multiple virtual hosts without a problem using a single IP address, whether it's a static IP to the box or a local IP from the linksys router.

Port 80 is not a problem in either configuration, if only using a single box. It could be a problem directing a router to send port 80 traffic to multiple machines, but that isn't necessary. Keep things simple instead.

Hosting websites on three machines can be done by using reverse proxy, but that's not needed, as I understand the question.

Finally, I have 8 or 10 websites running as virtual hosts on a single Debian box, all using php, mysql, etc. without a problem, so I don't think it is a concern.

Thank you all the reply.

Problem is can you add rule for port forwarding and dns name on r/g? I think a home use linksys router not capable to do that unless a PC based gateway using linux, isn't it?

I've never seen layer 7 forwarding on a home router before, really wouldn't expect it ever personally.