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• Setup local EC2 style cloud?

  - by John Kramlich

  I was recently given 3 dual opteron 2400 servers with 4GB of RAM and 120GB hard drives. I am interested in setting up something similar to Amazon's EC2 for my own personal web development use. Basically, I would like to spin up instances from an ISO or other disk images and have them available to test and develop software. Are there open source solutions I can use to accomplish this? I am assuming one of the machines will need to act as a controller of some sort for the other two. I use Sun's VirtualBox on my local development machine to virtualize various versions of Microsoft Windows. However, I'm not sure if that's the best tool for what I am trying to achieve. I apologize in advance if this question is to vague to get meaningful responses. I am new to cloud computing and fairly new at server administration.

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• nmap reports host up when it isn't

  - by martianway

  On an Ubuntu VM I ran: sudo nmap -sP 192.168.0.* This returned: Starting Nmap 5.00 ( http://nmap.org ) at 2010-12-28 22:46 PST Host 192.168.0.0 is up (0.00064s latency). Host 192.168.0.1 is up (0.00078s latency). Host 192.168.0.2 is up (0.00011s latency). . . . Host 192.168.0.254 is up (0.00068s latency). Host 192.168.0.255 is up (0.00066s latency). The problem is I only have 4 live machines on 192.168.0.* so why did nmap report every ip in the subnet has a live host? The ip address of the Ubuntu machine is 192.168.28.131 From this VM I can ping the live systems on my internal subnet 192.168.0.* and get the expected response. And if I ping a machine that doesn't exist I can get no response as expected.

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• Thin web server - single or multiple instances per IP address:port?

  - by wchrisjohnson

  I'm deploying a rack/sinatra/web socket app onto several servers and will use thin as the web server (http://code.macournoyer.com/thin/). There are almost no views to show, so I am not front-ending it with a traditional web server like Apache or nginx. In general, you see thin started and the underlying config file for it has the number of server instances to start, say 3, and the port to start with, say 5000. So, in my example, when thin starts, it starts up three instances on a range of ports, starting on port 5000. If I have a series of virtual machines, say 3, 6, 9, etc. that I treat as a cluster, would/should I choose to start a single thin instance on each VM, or multiple instances on each VM? Why? Thanks - Chris

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• Screen rotation hot key (CTRL+ALT+UP) not responding, what's going on?

  - by Jamie

  The other day my son (11 months) discovered a new hot key combination on my laptop. As I'm sure many of you are aware (I wasn't until the other day), on machines with Intel Graphics, pressing CTRL+ALT+{any arrow key} rotates the screen. After I recovered from my shock, and did a little sideways Googling to figure out how to fix it, I decided this might actually be useful. I read a lot of online documentation, and it fits better on the screen when it's rotated. Since it's a laptop, I hold the machine like a book and read it. It worked great all afternoon yesterday. But today at work I tried to show a friend this new trick, using the same laptop, and found that the CTRL+ALT+UP no longer works. I can rotate it to any orientation but the normal one. I'm guessing something else is intercepting this hot key, but what could be doing this?

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• Black screen after scheduled resume from sleep

  - by macbirdie

  I have a problem with my two Windows 7 setups at home. Whenever a scheduled task wakes up the machines from sleep, a black screen with a mouse cursor appears. If I move the mouse or press any key, desktop appears. The biggest problem is that during that black screen phase the display, sometimes even the PC too, doesn't go to stand by after a set period of time in power settings. If I get the desktop to show up, standby functions work fine. Display goes blank after a few minutes and as soon as the task doesn't need the PC, it goes back to sleep. It's frustrating that this "feature" is wasting energy and keeps lighting up the pc in the middle of the night for me to find it that way after I wake up. I found a handful of threads on the intertubes about the issue, but there were no answers in any of them. It sometimes happens in my XP machine at work as well.

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• Resources for writing kernel in C

  - by anon

  I don't want to write my own boot loader -- happy to use Grub. I just want to implement pre-emptive multi threading, a basic file system, and virtual memory. I want something that can run on top of qemu. What's a good resource (book / tutorial) for accomplishing this goal? Thanks!

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• Windows Home Server is showing signs of death

  - by Guy

  I have a Windows Home Server (HP EX485 MediaSmart Home Server) and it started acting up about 4 weeks ago and a few days ago complained of a corrupt database and would I like to try and recover it? Yes, I would but I ended up losing all backups. I have to reboot it frequently for the client machines to be able to see it. I have 4 hard disks in the computer. I suspect that the primary hard disk is going bad. My first question: How can I confirm if it's going bad or not? I'm thinking about removing the primary disk and replacing it with one of the others and reloading the OS with the server restore disk. I know that I'll lose everything (but I recently did anyway) but is there any other reason why I should not do this?

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• Unable to deactivate windows xp by modifying the license in the registry

  - by ConorWalsh

  I need to deactivate windows xp so I can set it up with a new license. Every tutorial I've visited follow the same steps. (Example http://www.ehow.com/how_6665848_deactivate-windows-xp-pro.html) The tutorials state that the 00BE timer file located in the registry needs to be modified. It is found by going to the registry and navigating through "HKEY_LOCAL_MACHINE," "Software," "Microsoft," "WindowsNT," "CurrentVersion" and "WPAEvents." After the file is modified Windows should be deactivated. However it never does. The value changes but when I run the command to add a new license key it states "windows is already activated". I've done this before on other machines at it worked fine. I can't find any other methods to change the license in XP. Has anyone ever had this issue or knows of another way of deactivating windows?

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• Running IPv4 program in IPv6 network

  - by stobyer

  I have an IPv4 windows client program and IPv4 Linux server. What I need is to run them in pure IPv6 network, although machines have dual stack. At the beginning I thought it's not a problem: I'll use 4in6 protocol (rfc2473) and that's all. I found a simple guide for Linux configuration here, but when I started to configuring windows 7, I couldn't find how to do it. There are plenty of info on how to tunnel IPv6 over IPv4 (6in4, Teredo) but not an opposite. Does anyone know how to do it? Thank you.

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• How can I stream video from my XP sp3 desktop to my win 7 laptop?

  - by Robb

  I would like to stream media from my XP sp3 desktop to my Win7 laptop. I currently have Windows Media Player 11 on both machines. The XP one is set up for the media sharing service as far as I can tell. I have also set the 'Play To' option to my Win 7 machine on the XP WMP. However, the only way I've been able to 'stream' is to simply tell my Win7 WMP to add a network folder to its libraries. This seems to work over the wifi but it does stutter a touch, even with a 20 second buffer. The stuttering also appears randomly, maybe 4-5 times during a 22 minute show. I feel like I'm doing something wrong. Is this setup OK or am I missing something?

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• What's the typical latency for key strokes using an ssh connection on a local wifi network?

  - by dan

  I develop software on a Macbook Air 1.6 Ghz but find running Rails test suites and generators on this computer very slow. I'm thinking about buying a Linux tower to put on my local wireless network to do my Rails development on. I would want to use my Macbook Air and ssh into the Linux box and do my development with Gnu Screen, vim, etc. Can I expect the keystroke and echo latency for a ssh session between two machines on a local wireless network to be negligible? Does anyone develop using this kind of local setup?

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• Add iphones, ipads to existing OpenVPN server

  - by Zoran

  Could someone please provide me with info How to connect iphone and ipad to a existing OpenVPN server based on Ubuntu 8.04? I saw similar posts (such is Simplest VPN setup for iphone on Debian Linux?) but I haven't seen answer which will help me. Most of our client machines (whic are connecting to OpenVPN) are Windows 7 & Vista. Now I have to add several iphone and ipad users. How to accomplish that task? EDIT: One more thing, I can not use GuizmoVPN since that I wil have to jailbreak iphone which is not possoble solution

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• How can I load one image over network to multiple computers on boot?

  - by user754730

  A few years ago I saw this in a company but I don't know how it was built. There was 1 Computer (I don't know if Windows Server or plain Windows 7 - the server) and 3 other computers (Windows 7 - the clients). As soon as the Windows 7 clients were started, they all started up the same image (Don't know if the same image file or just the same state) over network and were able to work on the computer. As soon as the machine was shutdown, all the changes made to the system were erased. How could I build a system like this so I have 1 image file which I keep up to date and then feed it to the other machines in my network? It would look this this basically:

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• Is there a way to force/manage file locking in windows?

  - by JPbuntu

  I have a 2 Windows machines networked and I am having trouble with simultaneous access to files. I would like only one user to be able to open a file at a time, which I thought was automatic, using file locks.... if the program used to access the file is locking the file. I believe the problem I am having is some of the programs I use, don't lock the file, and there for can be modified simultaneously by multiple users, which is very much not desired. Currently I am having this problem with only two computers, although as soon as I can figure out a solution to this problem the network is going to be expanded to 6 computers, which will include Windows 7, Vista, and XP, as well as a central file server (Samba). Is there a way to ensure that all files opened in windows get locked? Any suggestions are appreciated, thanks.

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• Our company claims that the DLP system can even monitor the contents of HTTPS traffic, how is this possible?

  - by Ryan

  There is software installed on all client machines for DLP (Data Loss Prevention) and HIPAA compliance. Supposedly it can read HTTPS data clearly. I always thought that between the browser and the server, this was encrypted entirely. How can software sneak in and grab this data from the browser prior to it is encrypted or after it is decrypted? I am just curious as to how this could be possible. I would think that a browser wouldn't be considered very secure if this was possible.

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• How to remove the port number from a url string

  - by Brono The Vibrator

  I have the following code snippet: string tmp = String.Format("javascript:window.open('{0}');", url); ClientScript.RegisterClientScriptBlock(this.GetType(), "NewWindow", tmp); the url generated by this code include the port number and I think that is happening becasue port 80 is used by the website and in this code I am trying to load a page from a virtual directory of the website. Any ideas on how to supress the port number in the url string generated by this code?

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• Rsync like windows backup tool

  - by Halfgaar

  I need to backup some windows machines and have been unable to find the proper tool. What I need is a tool that does efficient copying of changed files to a windows network location, like Rsync does. In turn, the server will then back that up using rdiff-backup, a tool which does very clever incremental backups. Right now I'm using windows' 7 included backup feature, but I really don't get that. It's too much off-topic, but it doesn't suffice (seems buggy as well). I looked into Amanda, but as soon as it wanted to install MySQL, I aborted. I also tried Deltacopy, but unfortunately, I don't remember what the problem with that was... Any advice for an rsync like tool that just does daily syncs to a network location?

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• Replicate portion of an LDAP directory to external server

  - by colemanm

  We're in the process of setting up a Jabber server on Amazon EC2 right now, and we'd like to have our internal users authenticate via LDAP so we don't have to create/manage a separate set of user accounts than the master directory in the office. My question is: is there a way to copy, unidirectionally, a segment of our internal LDAP directory (the user accounts OU) to an external LDAP server and authenticate Jabber against that? We're trying to work around having our externally hosted machines out in the cloud accessing our internal network directly... If we can replicate in one direction only a subset of the user accounts, then if that gets compromised we don't necessarily have a critical security breach into our internal network.

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• What are possible causes of IDirect3DVertexBuffer9::Lock failing?

  - by Suma

  In error reports from some I have quite often seen following behaviour: IDirect3DVertexBuffer9::Lock fails, returned error code is D3DERR_NOTAVAILABLE. Once this happens, quite frequently (but not always) it is followed by CreateTexture or CreateVertexBuffer failing with error D3DERR_OUTOFVIDEOMEMORY. What are possible reasons for vertex buffer lock failure? Could virtual memory address space exhausted, or what?

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• Realtime file-level mirroring from local NTFS to network drive

  - by hurfdurf

  We have some data collection machines running WinXP. After a new file is written, we would like to immediately copy the new file to network storage (a NetApp CIFS share) automagically. We need realtime or near realtime copies generated (copy upon filehandle close would be fine -- these are not long-running system logs). Two commercial applications I've found so far are MirrorFile and IBM's Tivoli CDP. Are there any reliable open source programs or simple ways to get Shadow Copy to do something similar? Bonus points if it runs as a service.

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• Access specifier while overriding methods

  - by Pradyot

  Assume you have a class that defines virtual methods with the access specifier public. Can you change the access specifier on your overriden methods? I am assuming no. Looking for an explanation.

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• how to run web application in another machine?

  - by angel ansari

  hi, I want to run my web application in another machine.My problem is that i have already created virtual directory in iis 7.5 and add web application in it. Its running in my machine properly but i am trying it run in another machine through url and add the ip address along port number but its not found the web page.Plz help me .

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• How do I install yum on Redhat Enterprise 4?

  - by Bob Cross

  For historical reasons, one of the machines that I manage has a Redhat Enterprise 4 boot disk (among others). Every now and then, we have to boot into RHEL4 to bring up some of the legacy software that we support and connect to. Since it's a fringe system, the Redhat support has long since lapsed and I can't convince myself that it would be worth paying just to get RPMs that I can go and get for myself. That said, the default RHEL tools are heavily biased against letting you do exactly that. I would like to install yum and use that as my package discovery and installation. So, is there an installation guide to integrating yum with an older RHEL 4 system?

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• Windows: Is there something to see and remotely control single(!) windows on a remote PC?

  - by Horst Walter

  Is there something where I can see and control single(!) windows of PC1 on PC2 remotely. Basically like it is possible with X-Windows. I am not talking / asking about A software which displays the whole desktop remotely (like VNC, Windows RDP). A X-windows server for windows, to connect to Linux. The answer here ( Windows Remote Desktop Connection for just a single window (or a single program) ) requires Windows Server 2008. I need to run this on two Windows 7 machines. Example: PC1 shows three windows, and I transfer, see, and control window 2 on PC2. -- Edit -- I have checked whether there is an X-Server for Windows <- Windows. But there seems not to be one other than Unix <- Windows: http://stackoverflow.com/questions/40453/what-is-a-good-and-free-x-server-for-windows

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• How do I add a servlet to an existing website with IIS7 and Tomcat6?

  - by jabe

  I've configured IIS7 and Tomcat6 successfully with the isapi redirector. I can get my servlets from tomcat's examples, and also my own servlets running from localhost. http://localhost/examples/servlets/ works fine for the supplied tomcat examples. How do i add servlets to existing web sites? I've tried adding a virtual directory to my website, the same way i did for the Default Website, but i get 404 errors thanks

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