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• High Availability Clustering and Virtualization

  - by tmcallaghan

  I'm trying to understand how the various virtualization vendors (specifically Amazon EC2, but also VMware and Xen) enable software vendors to provide a real HA solution in the environment where the servers are virtualized. Specifically, if I'm running any HA application (exchange, databases, etc) I need to ensure that my redundant virtual "servers" aren't located on the same physical server. Using in-house virtualization solutions (VMware, Xen, etc) I can provision accordingly as well as check the virtual - physical arrangement. I could, however, accidentally "vmotion" to the same physical hardware. With EC2, I don't even have the ability at provision time to select different physical servers. Since their Cluster Compute Instances are 1 virtual server per physical server it seems to be the only way to guarantee I don't have a false sense of redundancy. Any ideas or thoughts would be helpful. What are others doing about this problem? If the vendors provided an API where I could get something as simple as a unique physical system identifier I could at least know if I'm going to have an issue. -Tim

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• How do I reduce RAM usage on my server?

  - by Abs

  I have recently launched a site that is very popular but I am having trouble with scalability. My site makes heavy use of FFmpeg and at peak times RAM usage hits the 2 GB point quickly and the swap file starts getting used. CPU usage starts rising too. Users complain that the site is slow. They say this because all FFmpeg instances run very slow because of the number running at the same time. Users make use of FFmpeg on my server in real time. Is there anything I can consider or do to ease down the usage of the server and RAM just shooting up? Maybe there is something better than FFmpeg (!). Is the only solution "throwing some cash" at a more powerful server? I have given little information, please ask for more, so this problem can be solved.

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• Pinging 192.168.1.4 is looking to 192.168.1.2?

  - by BVernon

  When I run the command "ping 192.168.1.4" I am get the following results: Pinging 192.168.1.4 with 32 bytes of data: Reply from 192.168.1.2: Destination host unreachable. Reply from 192.168.1.2: Destination host unreachable. Reply from 192.168.1.2: Destination host unreachable. Reply from 192.168.1.2: Destination host unreachable. Can anyone help me understand why in the world it's telling me that 192.168.1.2 is unreachable when that's not even the ip address I typed in? I'm very confused. Also in case it's relevant, I'm on a workgroup.

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• safe to setup NAS in virtual image with web server?

  - by Erik

  My current setup is Ubuntu Desktop, running Apache + MySQL + PHP stack. I use this image to host my small website to the outside world. I want to now run a virtual machine on the box, that will act as the FreeNAS box for my internal network. This sounds like a bad idea if the website gets hacked/attacked. Should I just give up and grab a dedicated machine instead? Can I instead virtualize the web server and NAS side by side on this machine?

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• What kind of website traffic can a 10mpbs connection handle?

  - by Blankman

  I need some help understanding firewalls. I played around with Amazon EC2 and it seems to provide a firewall out-of-the-box. When I say firewall, to me that means the ability to block ports from being accessed from the outside world, or to only specific security groups. I'm looking at a dedicated server hosting provider and they provide a hardware firewall for $50/month and it is limited to 10mbps. Can someone explain to me what kind of traffic this correlates to? Are these usually limited to the number of simultaneous connections also?

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• OpenVPN and Squid Setup troubleshooting

  - by Adam

  I am trying to setup squid to tunnel via openvpn so that I can just enter an Ip and port in my browser settings and use it as a US proxy. My server is a OpenVZ VM. Running into some issues: I setup openvpn using : http://safesrv.net/install-openvpn-on-centos/ as part of that guide I also ran: iptables -t nat -A POSTROUTING -o venet0 -j SNAT --to-source iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to-source Installed squid using this guide: http://www.server-world.info/en/note?os=CentOS_6&p=squid from that guide changed acl lan src 10.0.0.0/24 to acl lan src 10.8.0.0/24 Next, I went to my browser proxy settings and put - 10.8.0.1 in the HTTP field. Put the port I had setup in the squid config file and tried to load a page. Nothing connecting. Any help? What am I doing wrong?

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• VGA passthrough and desktop virtualization

  - by Zacariaz

  In short, my dream is to have one machine with multiple paravirtualized desktop and server guests, one of which has to be a Windows desktop with powerful graphics. As Windows can't be paravirtualized in the normal sense of the word, I was quite happy when I heard about VGA passthrough, but then I read on. As I understand it, such a setup would mean that the Graphics will be dedicated to one particular guest, thus you wouldn't be able to switch between guests. If this is in fact so, would someone please explain to me what the purpose/use of VGA passthrough is? I can think of no real use for it. Yes it's a cool technology, but to me it seems pointless. It's true that it's possible to passthrough individual VMs to separate GPUs, which is also cool, but in the end I should think that two seperate computers would make life a whole lot simpler. Again it seems rather pointless.

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• Best Wiki Software For Product Support

  - by Zapnologica

  Good day, I am looking for a wiki system which we are going to use at work for a form of product support. We manufacture multiple devices and now i want to make a wiki which contains all sorts of relevant and helpful information on that product which the users can look at before trying to contact us for support? Now immediately the 1st option that comes to my mind in Media wiki but I dont just want to jump on the band wagon. I thought I would ask around first. It should preferable be free. But obviously if its really worth paying for then thats not the end of the world. And the uploading of content and media is not of much importance as the end users will simply be reading the information which the company has published. Another nice to have but is not critical is if it where to run on asp.net as we have Microsoft server running anyway.

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• Error sysprepping Windows 8 Enterprise 90-day trial

  - by Philip

  I am using the Windows 8 Enterprise 90-day trial to evaluate the latest version of Windows for a private school. The way I work is that I use sysprep to prepare an generalized image, then I clone it to the school's computers. When I follow the instructions and try sysprep on my installation of Windows 8 in VirtualBox, sysprep thinks briefly and gives me an error message: Fatal error occurred while trying to sysprep the machine. Once I acknowledge it, sysprep closes. I checked the Windows Event Log, and there's nothing there that I could see. I also followed some instructions to cure this problem, but nothing changed. The error remains. My best guess is that the 90-day trial prohibits the use of sysprep, but I can't be sure. It might also be my use of VirtualBox, or who-knows-what. Has anyone had success with this, or encountered the same issue on real hardware?

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• Why can't my FreeBSD 6.1 (vmware player client under Win7) do DNS in Bridged mode.

  - by Walter Stickle

  I have a 64-bit FreeBSD 6.1 client, running under Windows 7 (64-bit) via VMWare player 3.0, with networking set to bridge mode. DHCP goes fine on boot... I get correct adress/gateway/nameserver info... I have good connectivity to the world in that I can ping any host I can name by IP addr, (including both of the nameservers in resolv.conf,) ...but I can't resolve any names. Inside the Windows box, the network interface has VMWare Bridge Protocol enabled, and the windows side of things has full connectivity. dig replies with: ;; connection timed out; no servers could be reached ...even if I use "dig @server_ip_addr" to point it at a pingable, working nameserver If I set VM networking to NAT mode, I can get outbound connectivity (with happy DNS) but, of course, can't do INBOUND connectivity, which I need. Thoughts?

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• Shrink NTFS Partition Windows 2003

  - by Coops

  We have an iSCSI target provided by a CentOS server attached to a Windows Server 2003 Standard box, formatted in NTFS. My question is this - I know we can resize the backend block device fine (LVM et al.), however how do you tell Windows the NTFS filesystem has shrunk afterwards? [note we want to shrink]. I'm imagining a world of pain if it's not done correctly! This is a production box, so ideally we'd like the process to keep the drive mounted and online during the process, but downtime can be scheduled if need be. 90% of what I've found on the subject so far basically involves using the 'ntfsresize' command in Linux to do the job -- but surely Windows can do this itself? Cheers!

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• How do I force a 64-bit windows 8.1 install?

  - by ausairman

  I have just purchased a copy of Windows 8.1 32-bit/64-bit from the MSDNAA program through my University. It came as an .iso file so I burned it to a DVD and installed / registered without any issues. I just found out it's a 32-bit install though, and I'm running a 64-bit laptop (Dell Studio 1555). The exact produce name I purchased is Microsoft Windows 8.1 Professional 32/64-bit (English). Is that just another name for "32-bit version that also works on 64-bit machines"? I have 4GB and I would like to code for 64-bit architectures so not having a 64-bit environment will be a real pain. I didn't see any options to choose the install type (it had Windows 7 64-bit previously but I completely wiped it). Any ideas?

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• Isolated Network Set-Up

  - by Isaac Kleinman

  I am looking to set up a small network for a client which would be isolated from his primary network. (I'm hoping to set-up the additional network as VMs on the primary network.) I've instructed the client to request a bunch of static ip addresses from his ISP, but I'm not sure how to proceed with setting this up. What hardware will I need and how do I go about the configuration? Heavy security is not my concern. All that's really required is that web requests from the two networks be presented to the outside world with different ip addresses.

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• can I connect two modems and comunicate on two side

  - by GongT

  I just wondering how modems work. I know the process of "modulation" and "demodulation". So I wanto know is "demodulation" are simple revese of "modulation" in real world. The PC can got an IP address when connect as type 1 What will happen when I connect them like type 2? type 1 : [PC] ================= [router] type 2 : [PC] === [m] ------- [m] === [router] [m] : modem(exactly same) === : Ethernet cable --- : DSL cable (phone line, maybe optical fiber, or something else?) ISP has a large number of model, Is them same thing as the one in my home(but with diffrent size/speed/price...etc)? Or it's completely different thing?

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• Why does MS-DOS tells me I need extended memory and thinks a file is read-only? [closed]

  - by Jake Inc.

  I am running a .COM file on a MS-DOS 6.22 boot USB drive When I run it on my laptop the program works fine but when I run it on my desktop I get error 40 not enough extended memory. When I go to the memory tab in GUI I try to switch none to auto, but I get the error "This file might be read-only". It's not read-only, when I put it on my desktop I change the settings and the new settings are in a .pif I can't run .pif in MS-DOs so I need to Change the .exe not create a .pif. Change the amount of extended memory all files have on my MS-DOS. On my laptop there is no memory tab, the only real difference is my laptop is x64. Thanks for helping but I think teh x64 bit has nothing to do with it I dont eve nthink iits in 64 bit mode because Im using a boot USB. What i need to is listed above, thanks for helping.

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• Random Connections to MySQL refused (Error 111)

  - by joatis

  A Perl/CGI webapp that has been running fine for almost a year has started to randomly been unable to connect to a remotely hosted MySQL. The Error thrown is : Can't connect to MySQL server on 'xx.x.xxx.xx' (111) Reloading the page often solves the problem The client is using Perl, DBI and SSL to connect to MySQL using the same configuration file each time. MySQL 5.0 Server Running RH EL5 Quad-Core AMD Opteron(tm) Processor 2374 HE, 8 cores Real Memory: 15.73 GB total, 11.81 GB used allows networking in my.cnf max-connections are not being met load is low. The servers firewall is open to the client's subnet. The mysql user has permissions from the client's subnet. I have my host looking into the problem but so far we're all stumped as to way the occasional connection is (increasingly getting refused) Any advice what to check that would cause the random refusal of connections?

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• How can I get a windows server to collate and email 4 daily reports/graphs for server performance

  - by Glyn Darkin

  I run a windows 2008 webserver and would like to setup the most basic performance monitoring in the world. What i would like is: a plot of ASP.Net request time for each w3wp process for a 24hour period a plot of CPU% utilisation for each w3wp process for a 24hour period a plot of Memory utilisation for each w3wp process for a 24hour period a plot of network utilisation for each w3wp process for a 24hour period a plot of disk utilisation for each w3wp process for a 24hour period I would these plots to be emailed to me each morning. Anybody know what is the simplest way to set this up? Thanks for your help in advance. Glyn

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• Queue emails under linux

  - by md1337

  I have a slow distant mail relay server and a web application I'm using locks up when sending e-mails to that distant mail server, until the e-mail is sent. After the e-mail is sent the page comes back and the application is snappy again. SO I'm trying to set up a differed mail queue locally on the application server (linux) so that the application uses that instead of the distant mail server. My rationale is that e-mails would get queued up locally until they are processed by the distant mail server, but at least the application doesn't lock up. I have installed postfix and set up the relayhost setting to the distant mail server, but performance has not improved. What appears to happen is that postfix just forwards my SMTP instructions in real time and doesn't really queue them? What can I do? Thanks!

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• Hide a 2nd Monitor from a Programs Print Screen

  - by jasondavis

  I run 2 monitors on a PC that also runs a program for the Freelancing site Elance.com. The program they provide, takes screenshots and uploads them to my account for a client to see at different intervals. My goal is to make the screenshot that the program takes and uploads, to somehow only take a shot of my "Main" or "Defualt" monitor and ignore my 2nd monitor. The main reason is my 2nd monitor generally has private data that I do not displayed to the world on a website. Does anyone know if there is any kind of program or trick I can use that will make it appear that I have 1 monitor when a Screenshot is taken? I am not sure how the program does it and how that works as I am a web developer and not a C++ or any kind of low level programmer. If the Elance program simply runs the same function that is called when a PrintScreen key is pressed on a keyboard, then I am thinking it might be possible to maybe trick that into only the default desktop? Any ideas or help would be appreciated, thank you

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• Monitors blank after restart [closed]

  - by offler

  i need help on the following issue. We have Dell T1650 PCs with 2 nvidia graphic adapters / Windows 7 and 4 attached monitors. At initial start all screens are blank, the computer does not show anything. If powered off by pressing the hardware power button and then restarting all monitors show a picture. The Windows event log shows only the errors, that the machine was shut down unexpectly. The last entry with blank screen seems to be that user specific dlls for every application are loaded. How can I find out the real problem?

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• Is setting an empty/blank DNS A record allowed?

  - by John

  I'm trying to wrap my head around the wonderful world on DNS. I have created a zone file for example.com which contains: @ A 1.2.3.4 * A 1.2.3.4 However I am also setting up my local DNS, local.example.com which I have created a separate zone file for containing the following: machine1 A 192.168.0.1 machine2 A 192.168.0.2 When I dig machine1.local.example.com it returns A record 192.168.0.1, great. Sadly, badmachine.local.example.com returns 1.2.3.4, as does local.example.com. I'm not sure of the best way to prevent this. If I add the following to the local.example.com empty A records are returned for the above 2 examples as is the behaviour I desire: @ A * A Is this allowed? Is this best practice, or am I doing things terribly wrong? I'm using PowerDNS with BIND backend. Thanks for your thoughts!

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• Undetected Virus? I study at College, and Now all of the school computers have paint.exe -autocheck

  - by Jeffy

  "C:\WINDOWS\system32\Paint.exe" -autocheck is added to the registry every time its removed. This is like global. All the lab PCs(more than a hundred), personal laptops have this file. I really have no expert help to turn to.. as jotti says this file is clean. Here's the dropped file [removed] It seems that we all had this game cheating tool on our PCs called "Garena Maphack". Everytime it was run it would drop paint.exe into the system dir. Paint.exe is diguised as the real paint.exe from windows. Having the same icon and such. Check out threat expert's report at threatexpert.com/report.aspx?md5=176288f6f22a80c76329853f8535d45b The game cheat that started this huge mess can be obtained from [removed] What do I do? any experts care to take apart this file?

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• Best practices for FQDN for standalone domain (is a two part domain.tld okay?)

  - by birchbark

  I've searched quite a bit and can't seem to find a straight, modern answer on this. If I am hosting a domain, say, mydomain.com, on a machine which is going to solely be used for that domain, and there are no subdomains, is there a real, practical reason besides compliance to create an arbitrary hostname (i.e. myhost) just in order to have a three-part FQDN (myhost.mydomain.com) to satisfy some sort of RFC or convention that's expected. This seems to make a lot of undue complexities from my perspective, and I'm not sure if there's an advantage to this or if it's just a hold-over from a time where all web resources came from a subdomains such as www and ftp which may need to scale to separate machines. I don't use www on my domain, either, which is ill-advised for all I know from an administrators perspective (though removing it is the norm from a designer's perspective)...

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• Need hosting (e-mail, http) for external domains

  - by disappointed

  This may not be the right place, but since it is a more technical aspect of the hosting world, I am taking the liberty to ask: I'm currently running a virtual server with nginx and postfix for web and e-mail, but I can't handle the administration and, due to frequent problems with e-mail services, I need to resolve this with a almost-standard hosting package (anything should work, even 5 MB static files would be OK). The exception being that I would like to use several domains, hosted with different registrars, for web and e-mail. Currently, this is a very simple configuration in my setup. All hosters I have looked at seem to think this a costly business (more than domain registration costs), but of course the recommend to transfer domains to them (they want the $$). Does anyone know of a hosting company that allows its customers to freely manage domains registered somewhere else?

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• Ubuntu server 9.10 freezes up after ~10 minutes - unconventional

  - by L33tCh

  There is a topic by essentially the same name, but my answer leads to another question which I would like answered so... My case is as follows: I connect through SSH to my server... no problems for many months on Ubuntu Server 9.04. Eventually I decided to updgrade and straight away I get the 10 minutes freeze problem. I went through all the possible fixes (many can be found here but my quick fix, the only that worked, leaves me with no real answer as to why and how to properly correct it... As ridiculous as it sounds... while I leave a keyboard plugged in... it runs without flaw. Can anyone make sense of this? For the sake of completeness, (although none of the following made any difference upon subsequent completion), some of the permanent changes I have made while trying to correct the issue are: replacing samba config file with 9.04 backup, booting with noapic and modifying sysctl.conf, just uncommenting additional settings for enhanced security.

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