Server Help

Hi-Tec+ · Novice Joined: Apr 05 2006 Posts: 29 Offline

MGB can you keep us updated on whats been going on with the site, I mean Im left in the dark on what is going on, all I know is that you were doing some fixing, can you tell us before you shut the php down?
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Mine GO BOOM · Posted: Wed May 03, 2006 11:32 pm *Post maybe stupid* Post subject:

Well, its a shared server. Because of this, I have no direct access to actual server applications on the machine, just the ability to restart things. So when someone else's account gets hacked on the server (nothing on my part was touched [compared to previous backups, done weekly], as the person only got the other user's privilege), and causes apache to suck, I can't do anything about it.

Which is why I'm in the process of setting up a completely unmanaged virtual server. Thanks to Xen, I'll have dedicated memory/processor time and complete root access to whatever the hell I want. Thus, as long as the physical hardware and the master kernel (each virtual machine does use their own kernel, but need a master one to boot the virtual machine software and to control them) doesn't crap out, I can fix anything in a very timely manner, instead of waiting on others. Plus, I can run test software such as ASSS or other things I'm working on. But this won't be completely setup until mid-month and I still won't switch these forums over until near the end of the month.

Confess · Zone Hoster Joined: Feb 10 2004 Posts: 532 Offline

I want to talk to you. Login to continuum, wouldya?. (MGB, that is)
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SpecShip · Posted: Thu May 04, 2006 4:32 am *Post maybe stupid* Post subject:

What were you using till now, Pro Hosters?
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"I could run a ss server on my car stereo!" -Xalimar
"Liberta tuit ma ex infernis" -Event Horizon
"I know too much about nothing." - Mine GO BOOM
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newb · Posted: Thu May 04, 2006 1:04 pm *Post maybe stupid* Post subject:

Cyan~Fire · Posted: Thu May 04, 2006 2:37 pm *Post maybe stupid* Post subject:

I don't quite get virutal servers. You'd think that the extra layer would just slow them down a lot.
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Cerium · Posted: Fri May 05, 2006 1:05 am *Post maybe stupid* Post subject:

Im sure it does, but its enough where its neglegable.
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Mine GO BOOM · Posted: Fri May 05, 2006 2:02 am *Post maybe stupid* Post subject:

The only time being in a virtual server causes problems is when you try to go into the 0 ring on the processor, which is roughly raw access to everything. So a system call of printf() won't be effected, but using dd to wipe clean a hard drive will be effected. With most of the new chips being designed now, there will be a -1 ring, which is where virtualization software will be able to run at, thus you can have hardware virtualization happening where the kernel can run in ring 0 without being effected.

Simple way of thinking about it: if you are doing things as a normal user, virtualization is very fast as you just run natively on the processor. Doing some root things will be the only slowdown, and for almost everything on the server, you'll be running in user mode much more than kernel.

Cyan~Fire · Posted: Fri May 05, 2006 8:33 am *Post maybe stupid* Post subject:

I see. So virtualization just modifies the standard protection stuff like memory and all so that you can have multiple users running just like normal?

How does it work with CPU sharing, though? Does it use a rotating sort of system like Windows?