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• What kind of server hardware is roughly necessary to serve website to 10k users?

  - by jcmoney

  I've been looking at VPS's and the specs they offer for entry level setups seems somewhat surprising to me. I'm am new to this topic but many of VPS offer less than 512MB of memory and my laptop has 4GB of memory so I am curious what does it actually take in terms of hardware to serve say 10k users (say 5k daily active users)? I figure a large number of factors can probably sway this a lot but just for benchmarking, say the site is a social networking site written in php using mysql + apache that's not really doing anything unusual like serving lots of media. So essentially a very basic Facebook minus the absurd number of photos and videos. What about 100k users (50k daily active)? 1 million (500k daily active)? Thanks in advance.

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• How to download Firefox extensions from addons.mozilla.org without installing them?

  - by kjo

  Pages at the https://addons.mozilla.org/en-US/firefox site often feature buttons that say "Add to Firefox". Clicking on such a button causes a Firefox extension to be downloaded and installed. I am looking for a convenient way to limit this action to the download step only, so that in the end I am left with the downloaded *.xpi file in my disk. Thanks! P.S. The following approach is not only inconvenient: it doesn't work!. Inspect the HTML for the button, and extract a URL like https://addons.mozilla.org/firefox/downloads/latest/1234/addon-1234-latest.xpi?src=search give or take the stuff after .xpi. at the command-line prompt, download this URL with wget or curl. This download attempt just hangs. (Even if it didn't, I'd like to find a less cumbersome approach.)

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• Windows calibration settings persistance over reboots

  - by Dmatig

  I'm running Windows 7 64bit on a laptop (Samsung R560) using a cheap external CRT monitor. The screen is a littler dark for my liking, despite having the physical monitors settings up to the max for all the brightness-related settings. Windows 7 has a tool called "Calibrate display color" (search in the start menu). Running this tool, you have a slider that allows you to adjust the "Gamma", which sliding up gives me acceptable brightness levels. Unfortunately, upon reboot (and certain other activities such as running certain fullscreen games) this is reset to default. Is there a way to make this persistent? Some registry setting? Batch file to run at startup even (less preferable as I'd like games to run brighter too)?

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• Puppet performance compared to cfengine

  - by Andy

  I'm considering using Puppet or cfengine. Key factors are performance, and research on the internet suggests cfengine uses less memory and CPU cycles compared to puppet. However, puppet seems easier to use. I need to manage several web servers, as well as handheld tablets and machines that will only connect to some central control servers periodically. All are Linux machines. Would I be able to use either puppet or cfengine for this? And if so, does puppet still make poor use of resources? I'd like to use puppet because it seems simpler, but a lot of the articles I've found refer to cfengine 2 - is cfengine 3 easier to configure? Thanks

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• 1000 HZ linux kernel necessary if I have tickless and high resolution timer?

  - by Bob

  I am trying to improve performance on my server. I have a few processes that need low jitter (less than 10ms variance). I have a load average of 4 maximum on an i7-920 (4 physical cores, 8 with HT). There are about 10 processes ranging from 40% to 90% of a core user mode. System usage is 3% total. Total CPU usage is 80% max. Will setting the kernel from 100hz to 1000hz improve the jitter if tickless and high resolution timers are already set? This page seems to indicate it still does something. https://lkml.org/lkml/2009/4/28/401 How about changing from voluntary (PREEMPT_VOLUNTARY) to preemptible (PREEMPT)?

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• PHP shell_exec times out, but not when executed manually

  - by Breck Fresen

  I have a Windows 2008 server with PHP and msys installed. I also have a simple php script that calls shell_exec and tars a few files. When I run the script on my development machine (Windows 7), it works fine. However, when I run it on the Windows 2k8 server, it times out. When I copy and paste exactly what's being run on the cmd line and run it, it executes w/out error in less than a second. One more important detail: when I shell_exec 'dir' or 'netstat', the script runs without any problems. When I shell_exec 'ls' it hangs. When I run ls on the command line, it returns immediately. Other details that might be useful: The Windows 2k8 server is a VPS hosted by Rackspace. I did vanilla installs of Apache, PHP, and msys, but I haven't installed anything else. When I run whoami, I see the php script is executing as the user "nt authority\system".

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• Windows 7 Image Restore with a smaller hard drive

  - by Vaccano

  I have a 500 GB drive that I have made a system image of. I would like to move that to a 250 GB drive (because it is a Solid State drive). I have made a Windows 7 Backup Image of my 500 GB drive. I am currently only using 163 GB of that drive. Can I just restore that to the target drive or will the restore be expecting a 500 GB drive? If it is expecting it I can shrink my partition to less that 250 and backup again. But I would rather not if that is not needed. Will the restore realize that it is not using all the space and just take what it needs?

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• Find files containing a string on the whole filesystem

  - by Fabio

  I need to find all the instances of a given string in the whole filesystem, because I don't remember in which configuration files, script or any other programs I put it and I need to update that string with a new one. I tried with the following command `grep -nr 'needle' / --exclude-dir=.svn | mail [email protected] -s 'References on xxx' If I run this command on a small directory it gives me the output I need in the form /path1/:nn:line containing needle /path2/:nn:line containing needle where /path1 is the full path of the file, nn is the row containing the needle and last field is the content of the line. However when I run the command on the root directory the grep process hang after a while. I run this script about 8 hours ago and even on a small filesystem (less than 5GB) it doesn't end and if I run top or ps the process seems sleeping root 24909 0.0 0.1 3772 1520 pts/1 S+ Feb10 0:15 grep -nr needle / --exclude-dir=.svn Why it doesn't end? Is there any better way to do this (it's a one time job, I don't need to execute this more than once) Thanks.

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• Are there pitfalls to using incompatible RAM (frequencies) in motherboards?

  - by osij2is

  I'd like to use 2 x 4GB DDR3 1600 dimms in a motherboard capable of only DDR3 1066. The DDR3 1600 is on sale and the cost is identical to 1066 dimms. It'd be nice to have these faster sticks around should i upgrade the motherboard. I assume the RAM can under clock itself or be changed in the BIOS. While obviously it's less than ideal situation, I don't know if there are other unintended consequences in terms of stability, performance and longevity of the board and said RAM. Am I doing any damage to the memory controller or RAM? I've always bought RAM at the max speed specified for the motherboard and I've never gone over so I'm not sure if there any caveats to this at all. Edit: I intend to use the RAM in pairs. I know that mixing RAM speeds is just a bad idea.

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• Could it be sane to use Windows Server 2012 as desktop

  - by nCdy

  what about using it on desktop? I've got enough strong PC with intel core i7 and 8GB Ram so what should I think about: why not? Were looking about major differences compared to windows 8, found less. for example new file system - can it affect me? In my usual day I need development instruments alike visual studio, virtualization tools, and some games So far I can't find something that must stop me, everything I need can work (seems like) there. Tell me why I must not do it or if that is sane to do.

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• Using mod_wsgi with mpm_itk: socket permission issue

  - by djechelon

  I'm using mod_itk as MPM for increased security in shared environment. I also have a Firefox Sync Server within one of the VHosts I host. That vhost is restricted to a certain user via AssignUserId user group. The problem is that the socket /var/run/wsgi...whatever.sock is chmodded srwx------ and owned by Apache's wwwrun. While I configured the vhost with WSGIProcessGroup sync WSGIDaemonProcess sync user=djechelon group=djechelon processes=1 threads=5 I still get the error that Apache wants to access a socket that is not accessible and because of this gets an error. Is it possible to configure mod_wsgi in order to create different sockets with different owners for different applications or to chmod its socket in a different way (less secure)? Currently, I'm running Firefox Sync as the only WSGI application. Moving it to a vhost that doesn't AssignUserId could solve this problem but will force me to change URL (and buy an additional SSL certificate), so I wouldn't consider this

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• How do I delay email delivery using Entourage 2008 with Exchange, e.g. using the X.400 Deferred-Delivery header?

  - by Matt McClure

  I'd like to delay the delivery of email that I send so that I can time delivery when the recipient is unlikely to be reading email and I can reduce the likelihood of getting into a chat-like conversation. I'm using Entourage 2008 and Exchange hosted by Rackspace. I tried naively adding a Deferred-Delivery header after reading http://www.faqs.org/rfcs/rfc2156.html and www.itu.int/rec/T-REC-F.400-199906-I/en , but my mail was delivered immediately. Ideally the delay would occur on the MTA instead of my MUA so that delivery would still occur even if my laptop were disconnected from the network at the delivery time I specify. My best workaround at the moment is to habitually use Entourage's Send Later button when composing mail and then click Send/Receive at the end of the day. This is less than ideal because recipients are often reading mail at the end of my day, and I often get immediate replies. Matt

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• Change Windows Server 2012 color scheme without Desktop Experience feature

  - by Fez Vrasta

  I have a Windows Server 2012, blue is nice... but I'd prefer a less "eyes puncher" color, maybe gray or black... I'm a GNU/Linux sysadmin and just the fact of have the entire GUI on a server is difficult for me, so I would avoid to install the Desktop Experience feature just to change the color of the GUI. I have read here: How to change color scheme in Windows Server 2012 That once I've changed color I may remove the Desktop Experience feature and the color will not be reverted to the original. So I guess there must be a way to change the color without install this feature pack, because looks like it just adds the control panel to set the color, but not the core feature, that maybe could be accessible within some registry key. Does someone have some idea?

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• What's a good public access terminal solution using old PCs and remote VMs?

  - by greenfingers

  Has anyone had experience using VMs as remote desktops for public access terminals (e.g. an internet cafe) In our case we don't want to charge money for access but I figure this solution has a few advantages, such as: can easily re-build VMs daily, erasing private data and clutter can use rickety old PCs for the 'dumb' terminals less IT support needed on site Can you suggest tools to help do this? Keeping the terminals up and running as much of the time as possible is the main priority, so they need to boot straight into full screen remote desktop and stay there.

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• Recommendations for Spam Filter

  - by dotdev

  We are currently using MxGuardDog for spam filtering. It works by pointing our MX records at their mail servers. The service seems pretty good, it keeps out the obvious spam, but I would still say it let's through mail that to me is spam, but I accept that on the surface those emails may not flag any of the universally recognised indicators for spam. If an email comes through that I believe is spam, I can login to the Web Console and blacklist the email/domain. However, 99% of the time I don't because it's inconvenient - or, should i say, it's far less convenient than a button in Outlook that allows me to report the email/domain as spam. So, what we're looking for is a similar service i.e. cloud spam filtering that has an Outlook plugin so that Administrators/Users can report spam. We are only a small company, 10 users, so cost is of course an issue for us. Many thanks dotdev

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• Could a too low voltage during long periods damage my computer fan?

  - by Sopalajo de Arrierez

  Computer fans use to run at 12Volt, but most as for today they allow 9Volt or even less to slow down the fan speed (RPM, Revolutions Per Minute). In cases of too low voltage, the fan stops, but I can see it "trying to start again". For example: my Tacens 9dB fan stops at about 10 Volts, but to start it again, 10.5Volt is not enough, and the engine tries to move the fan (I can see a small movement as an "attempt" to move) each 1-5 seconds, but it does not succees, so the fan keeps at 0 RPM. Maybe that "attempt" to move could damage the internal engine of the fan when it last for hours or days?

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• Web application and remote storage of files

  - by Matt

  Hi have a web application that can store lots and lots of files on the server. i.e. users upload data to it. The files are stored below a particular storage path. The web host will be an IBM xseries 345. However, the disks are really expensive so we would like to put the files onto a less expensive server. Now here is the question. Should I use an NFS mount on the IBM server of a path on the storage server? Or should I write some scripts to upload the files to the storage server instead. Both the storage server and the web host are on the same network. Only the web server is visible to the world. Is NFS performance suitable for an expected low to moderately loaded server?

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• ASP.NET High CPU Bringing Servers to their Knees

  - by user880954

  Ok, our new build is having 100% cpu spikes on each server at random intervals. For long durations it make the site totally unresponsive - this will be at peak times as people in different countries log on to the site etc. We've looked at perfmom, memory profilers, CLR profiler, sql profilers, Red gate ants profiler, tried load testing in UAT - but cannot even reproduce the problem. This could mean only thousands of users hitting the live site causes it to happen. One pattern we did notice was that the new code - the broken build - actually uses noticably less threads. We are also using spring for IOC - does this have a bed reputation? To make things worse, we cannot deploy to live due to the business impact - so cannot narrow the problem down to subset of the new features we've added. We truly are destroyed - has anyone got any battle scars that may save us a few lives?

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• What's the weirdest thing you've ever seen a non-techie do to a computing device?

  - by googletorp

  I thought it would be fun to bring out the stories on what people have done throughout the ages with computers due to their sometimes, to put it politely, less than perfect grasp of technology. I'll start out with a little story from my high-school days. After graduation, a classmate of mine, who took IT and subsequently scored an A in the subject, was sent an e-mail by a friend. She replied to his mail: "I'm sorry, but I can't reply your mail, since I don't have your email address." Till this day I still can't understand why she gave such a weird reply as she was a bright girl although not a techie. Now, let's hear those other battle stories from the real world...

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• Packet loss with all adapters on one PC only on the LAN

  - by Enigmativity

  I have a Windows 7 64-bit machine that is losing up to 20% of IP packets on both adapters - wireless & LAN. Browser traffic appears to be affected the most, but it is happening to all protocols. All other computers on the network are functioning fine. If I ping from my faulty machine to any machine on the LAN (wired or wirelessly), including the router/gateway and internet sites, I get up to 20% packet loss. If I do the following commands: ipconfig /release ipconfig /renew then I sometimes get my network performance back for a matter of a few seconds to less than a couple of minutes. Rebooting also works for a short period of time. This problem has been occurring for a couple of months and is getting worse. The computer used to work just fine. I updated the wireless adapter firmware the other day with no effect. Does anyone know what is happening?

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• When browsing a specific network share remotely, Windows Explorer continuously jumps back to the parent folder

  - by Evil Pigeon

  I am accessing a specific network path on another domain. It looks something like this: \\CoputerName.OtherDomain.in\c$\Inetpub\Testing\Website\ In under 30 seconds, I am automatically jumped back to \\CoputerName.OtherDomain.in\c$\Inetpub\Testing\ In less time it then jumps back to \\CoputerName.OtherDomain.in\c$\Inetpub\ Then it jumps back to c$ for its final resting place. \\CoputerName.OtherDomain.in\c$\ At first I thought this had to with a faulty keyboard, but this behaviour also occurs when the window does not have focus. It's as if windows thinks that the folder no longer exists (as in someone else has deleted or moved it). This behaviour is not specific to my PC either, it occurs from other machines in the office. Edit: It looks like this issue only occurs from other Windows 7 machines. There are no issues accessing the path from XP.

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• Is it Possible to Increase Display Resolution for OS X Maverick

  - by Michael

  The new OS X Maverick operating system has reduced maximum display resolution from 1920 x 1200 in Mountain Lion to 1680 x 1050, which is a SIZABLE reduction. The difference is obvious when viewing videos or photos. In addition, the colors are less vibrant. Does anyone know a way to change the display resolution for Maverick, thus restoring Mountain Lion resolution (1920 x 1200)...along with color vibrancy. By the way, I am using a 2012 Macbook Pro, with Matte display, which I think makes matters worse. At 1920 x 1200 my Macbook Pro was excellent...but at 1680 x 1050, it is very pedestrian.

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• PostgresQL on Amazon EBS volume, realistic performance, or move to something more lightweight?

  - by Peck

  Hi, I'm working on a little research project, currently running as an instance on ec2, and I'm hoping to figure out whether I'm going down the right path. We, like a thousand other people, are making use of some of twitters streaming feeds to do gather some data to have fun with and my db seems to be having problems keeping up, and queries take what seems to be a very long time. I'm not a DBA by trade, so I'll just dump some info here and add more if need be. System specs: ec2 xl, 15 gigs of ram ebs: 4 100 gb drives, raid 0. The stream we're getting we're looking at around 10k inserts per minute. 3 main tables, with the users we're tracking somewhere in the neighborhood of 26M rows currently. Is this amount of inserts on this hardware too much to ask out of ebs? Should take a look at some things with less overhead like mongodb?

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• Why would you use EAP-TTLS instead of PEAP?

  - by Ivan Macek

  As I understood EAP-TTLS and PEAP share same level of security when implemented in wireless networks. Both only provide server side authentication via certificate. The drawback of EAP-TTLS can be non native support in Microsoft Windows so every user has to install additional software. The benefit of EAP-TTLS can be support for less secure authentication mechanisms (PAP, CHAP, MS-CHAP) but why would you need them in modern and properly secure wireless system? What are you opinions? Why should I implement EAP-TTLS instead of PEAP? Let's say that I have most Windows users, medium Linux users and least iOS, OSX users.

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• VirtualBox serial port, limit of two?

  - by Evan Carroll

  Using VirtualBox, Is there a limit of two serial ports per VM? I'm currently engaging in a task that requires more than two, but less than or equal to four ports. I'm at a loss of what to do to get COM3 and COM4 up? How do I do it if the Virtual Box GUI doesn't currently support more than two serial host devices? Can I configure them external to the GUI? Is there a hard-cap on two devices? And, if so, for the love of god, please entertain me with the reasoning? I know Windows and Linux don't impose such a limit, it would seem awkward to impose it in virtualization layer. This is for cheap dial-in project with proprietary Windows tools. I'm using a Quatech serial multiport adapter to provide the ports to multimodems.

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