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• Problem after installing node.js on Debian Lenny

  - by gmunk

  I managed to install node.js successfully on my machine but when invoking make test I get an error message: python tools/test.py --mode=release simple === release test-net-pingpong === Path: simple/test-net-pingpong server listening on 20989 localhost server listening on 20988 undefined Error: EAFNOSUPPORT, Address family not supported by protocol at net:1041:19 at dns:105:7 at EventEmitter._tickCallback (node.js:48:25) at node.js:176:9 I found out that EAFNOSUPPORT means that the OS does not support a particular protocol and a program tries to use it. So from what I can deduce my Debian does not have support for dns? Any help is appreciated!

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• Suggestion of device WiFi range in it's spec. Possible?

  - by SeeR

  I have router Draytek Vigor 2100VG at home almost in the center of it. The farthest point at my home is my balcony, ~12m from it. I have constant wifi signal range problems with some of my devices, but not with others. Notebook Lenovo W510 - no problems Nokia Home Music - always on 10m - no problems Sony PS3 - always on 7m - no problems Sony tablet S - problems around 6m Sony PSP - problems around 8m Sony PS Vita - problems around 8m Nokia E63 - problems around 8m I'm curious why my Notebook don't have any problems even on the balcony? I guess it has better hardware or uses more power for transmission. This information is really important when you want to buy new device/computer, so my real question is: Can device wifi range can somehow be found/suggested from official hardware technical specification? If not Is there some web page with wifi range reviews?

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• Windows Java-based apps not working

  - by DariusVE

  After updating the Java JRE to 7u25, many Java-based applications not works as usual, the I upgrade Java to 7u45, and still the apps not working. Minecraft start screen not showing, have to press TAB key to select the Run button and press ENTER to run the game. Netbeans IDE it's running, but none it's showing on the screen. Eclipse and JDownloader are working fine. I cannot run the Java Control Panel, it's only shows the Java icon at the taskbar. My System OS: Windows 7 Ultimate SP1 64Bits Java: java version "1.7.0_45" Java(TM) SE Runtime Environment (build 1.7.0_45-b18) Java HotSpot(TM) Client VM (build 24.45-b08, mixed mode, sharing)

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• afp/smb transfers caps at 2 megabytes/sec, wireless N

  - by RD.

  I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn't a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n is set to 130mbits, so I should see real world transfer speeds around 12-16 megabytes/sec I did this command on both computers sudo sysctl -w net.inet.tcp.delayed_ack=0 which is supposed to lower tcp overhead, but this did not affect it. How can I get the speed I am expecting?

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• Resolve `strace` file number to a filename

  - by Mike Pennington

  I am debugging a problem where MoinMoin on CentOS is throwing a permissions error, but I can't track down where the problematic file / directory is. I ran strace -vp <pid> on the apache pid; when I have the problem I see this: epoll_wait(10, {{EPOLLIN, {u32=3487534344, u64=140367313734920}}}, 2, 10000) = 1 accept4(6, {sa_family=AF_INET6, sin6_port=htons(52621), inet_pton (AF_INET6, "::ffff:105.193.30.91", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28], SOCK_CLOEXEC) = 11 ## Later on... read(7, 0x7fffa658ad7f, 1) = -1 EAGAIN (Resource temporarily unavailable) However, since apache is already running, I see no corresponding open() on the file referred to as 7; thus I see the permissions problem, but I still don't know which file is the problem. I know I could try to catch all the file opens when I respawn apache, but I'm hoping there is a way to map file 7 to a real filename... is there a way to do this?

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• Linux: set up media server to stream video via the Internet?

  - by Hassan

  How do I set up a media server in Linux which streams video over the internet? Is it easy to do this? I want a server that will actually encode video in real time to allow it to stream over sometimes slow or unreliable networks. Basically, I want a server that works on the internet. I have a directory with a bunch of video files, and want to make this accessible to myself remotely. For other situations, I found great and useful software (such as the PS3 media server). I'd like to find something equally as useful for streaming video over the internet.

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• Nested %..% representation in Windows 7

  - by prosseek

  In order to organize the PATH environment, I came up with the following method. Setup variable : ABC = "PATH1;PATH2" Set the path variable using the predefined setup variable : Path = %ABC%%DEF% ... It seems to work fine, but I found that some of the variables are not transfomred into real paths when I run the set command. (I mean, the PATH=PATH1;PATH2;%DEF%, for example). What I found was as follows. If the variable name has '_', Windows can't transform it. If the variable has the path with %...% variable, windows can't transform it. Q1 : Am I correct? Q2 : If so, is there a way to by pass the nested %...% varibale problem?

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• Standalone server setup for compute capacity

  - by mikera

  I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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• How to make local apache server public/visible ?

  - by George

  Hello. I am running an Apache2 server on a Fedora 13. I'd like to make it publicly accessible(visible).For example I'd like when somebody types http://my.ip.numbes/ that they would see what I have in my document root folder. Just for a presentation of a course work at university. Permissions are set to 755. User owning the document root is apache. SELinux is temporarily disabled. But port 80 is closed. I tried to open it by adding an entry to iptables and restarting them, no change. I guess I am missing something big here. Help would be greatly appreciated. Note: I have a static (public, real) IP address.

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• What is a descriptive name for a web service that responds with plain text?

  - by Rich Shealer

  I'm looking for the proper name for a web service that responds with text as opposed to XML. As an example this "cardServer" service will return 5 cards for a poker hand. http://hostname:8080/cardServer/deal/Game=Poker&Qty=5 The result could look like this: Card1=Ad Card2=Kc Card3=Ts Card4=5d Card5=3d The real world example is not as trivial, but the concept is the same. Parameters if any are passed as POST variables. We currently parse the response into a string list and use the values. The process works just fine. What I'm wondering if this service method has a name that has easier tools to deal with the responses and therefore did we reinvent the wheel? For the record the service was provided and maintained by a customer.

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• Is it dangerous to add/remove a hard-drive to a Windows machine which is in stand by?

  - by Adal

  Can I add a SATA drive to a Windows 7 machine which is in standby mode? The hardware supports hot-plug. Could pulling the drive out while in standby corrupt the data on the drive (unflushed caches, ...)? Does Windows flush before standing by? How about swapping a drive with another drive of different kind (SSD - mechanical disk) and size, also while in stand-by. Could the OS when waking up believe that the old drive is still there, and write to it and thus corrupt it, since the new one has different partitions and data?

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• Emulate a USB port as a USB flash drive?

  - by Wilco

  Does anyone know of any software that can emulate a USB flash drive through an available USB port in OS X? Perhaps some way to map a directory to a USB port that could then be connected to another device that supports reading USB storage devices? I'd love to connect my laptop to my car's USB port and access files as if it were a USB drive. I know about the target disk mode with firewire (not sure if this is also supported over USB), but I was hoping for something that doesn't require booting outside of the OS (I want to retain use of the machine). Any ideas?

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• Windows 8 Secureboot: How do you bootup from another device such as cd/dvd drive or usb flash etc.?

  - by Victor T.

  On PC's and laptops running an older OS, this is just a simple matter of going into the BIOS and setting the boot sequence and putting the boot cd/dvd in the drive. In many cases you can even just hit one of the F* function keys to bring up the boot sequence menu on-the-fly during POST. The main problem I'm running into is that other devices besides the primary HD is disabled when SecureBoot is enabled. So far the only way I've gotten it to work is to disable SecureBoot and enable something called legacy mode. Needless to say this make it difficult to boot things like OS recovery tools, PartitionHD backups, Linux LiveCD's and a bunch of others. Is there another procedure for doing this since it seems to mess up the Windows 8 install? By mess up I mean that after re-enabling SecureBoot and starting Windows 8 normally, the OS goes into a 'preping repair phase' for some reason that takes forever to complete before getting into a usable desktop.

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• ubuntu server in a vm, can't connect to internet

  - by jessh

  I'm attemtping to host my own development web server in a virtual box guest, Ubuntu Server. I would like this virtual machine to be accessible from not only my home network, but outside the LAN as well. As such, I've set up a static IP (so I can later forward ports to this static IP.) My virtual box settings have this vm only using one adapter -- in bridged mode. Here's what my /etc/network/interfaces looks like: iface eth0 inet static address 10.0.1.203 /*this is outside the DHCP range*/ netmask 255.255.255.0 gateway 10.0.1.1 network 10.0.1.0 broadcast 10.0.1.255 dns-nameservers: 8.8.8.8 8.8.8.4 Here's what the output of ifconfig looks like: https://dl.dropbox.com/u/2241201/locker/ubuntu.png My Host is a mac mini, running OS X 10.7. From within the guest, if I ping google.com: $ ping google.com # outputs 'ping: unknown host google.com' immediately Why am I unable to access the web?

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• Blank screen after grub menu

  - by Tim

  I just rebooted an Ubuntu Server 10.04. After choosing boot options in the grub menu, though, it just displays a black screen with the blinking white underscore in the upper-left corner. The machine has had (hardware) trouble with networking before, but the problem remains after 10 minutes, so I don't think it's the problem now. Booting into recovery mode or using earlier kernels yields the same problem. This also happens if I boot from another hard-drive. I haven't yet tried to boot from CD as the machine lacks a CD reader. How should I diagnose the problem? Update: My boot options are: recordfail insmod ext2 set root='(hd0,1)' search --no-floppy --fs-uuid --set 567[redacted] linux /boot/vmlinuz-2.6.32-29-generic root=UUID=567[redacted] ro quiet splash initrd /boot/initrd.img-2.6.32-29-generic Update: Also, I cannot access the virtual terminals (ctrl+alt+Fn).

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• Windows Server 2008 R2 Maximum Processor Limit Confusion

  - by Stevoni

  As I was looking through the Windows Server 2008 R2 specifications, I saw that the maximum supported processors is 64 sockets for Datacenter addition. This puts the maximum number or cores at 256 (if all sockets are quad cores), which I think it's just silly, but whatever. And now the questions: How does one set something like that up? (Obviously not for me, but humor me) Are there multiple dual socket motherboards running in a giant case with a ton of memory? How does the OS see all of the CPUs if they're on different boards? What would be a real world example of a need to have 64 sockets attached to one operating system vs 32 2 socket servers?

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• Installing isolated instance of MySQL on Windows using silent install with .msi

  - by Abram

  I'm trying to write an installer for an internal application we wrote. After it installs our application it then installs MySQL using the .msi installer in silent mode. I specify the install dir and data dir to that of a directory within my application's install directory, such as: msiexec /i @@MYSQL_INSTALLER_FILE@@ /qn INSTALLDIR="@@INSTALL_DIR@@\MySQL\" DATADIR="@@INSTALL_DIR@@\MySQL\" USERNAME="@@DB_USER@@" PASSWORD="@@DB_PASS@@" (the @@variable@@'s are replace by my installer routine using InstallJammer) Once installed, I use mysqld.exe to install a windows service with a custom service name and defaults file like so: mysqld.exe --install CustomMySQL --defaults-file="@@INSTALL_DIR@@\MySQL\my.ini" This works fine as long as there is not already another instance of MySQL installed. If there is it silently fails to install MySQL. Running the msi installer manually (double-click) shows an error that a previous version is already installed and just aborts. Is there a way to automate installing MySQL as an isolated instance, regardless of whether another version/instance is already installed?

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• Screenflick Audio option in MacBook Pro

  - by John

  When after I shut down my MacBook Pro by holding the power button for a few sec, (which I found is bad for the computer, so I will not do anymore) I found that my speaker doesn't play until I plug in and out earphone into the machine. When my speaker is not working like this, and when I am on a random webcam chatting site like chatroulette.com, they can hear the music playing on my iTunes when I choose Screenflick Audio option in the Mic setting. But when the Speaker is working back again, they don't hear the music playing even when I do Screenflick Audio mode. How can I make it work? Also, how do you make the chatting partner hear my music playing on my computer while I talk to them (not via my speaker, since it's bad quality).

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• How to switch a Sound Ouput Device before the Mac goes to sleep?

  - by Konzepz

  I've connected my MacBook to a set of external speakers with a USB. Now, every time the computer goes to Sleep Mode, there's an awful static sound coming from the speakers. I guess this is some bad wiring; but that's what I've got. However, I can use an idea for a script (AppleScript, bash, whatever) that will switch off the USB output sound in (System Preferences) before the computer goes to sleep, and will switch it back on (if exists) on Wake. Any ideas? Thanks!

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• How to make a quiet laptop ? [closed]

  - by psihodelia

  Most modern laptops have very noisy fans. I am looking for a quiet laptop or a small stationary computer which has all its hardware built in a display. Most tasks will be pdf/docs processing, real-time audio processing, web-surfing and skype video chats. Certainly, there is no any fan-less model today; but maybe some of the existed laptops do not switch on their fans so often or implement different solutions? For example, an iPad has no fan at all and it is fast enough for my needs, but it has no normal operating system, so I can't use it for anything but audio chats and web-surfing. Or maybe I can buy a laptop and tweak it to make it absolutely noiseless? Can you recommend me any solution please? Thanks in advance!

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• uWSGI and python virtual env

  - by user27512

  I'm trying to use uWSGI with a virtual env in order to use the Trac bug tracker on it. I've installed system-wide uwsgi via pip. Next, I've installed trac in a virtualenv $ virtualenv venv $ . venv/bin/activate $ pip install trac I've then written a simple uWSGI configuration script: [uwsgi] master = true processes = 1 socket = localhost:3032 home = /srv/http/trac/venv/ no-site = true gid = www-data uid = www-data env = TRAC_ENV=/srv/http/trac/projects/my_project module = trac.web.main:dispatch_request But when I try to launch it, it fails: $ uwsgi --http :8000 --ini /etc/uwsgi/vassals-available/my_project.ini --gid www-data --uid www-data ... Set PythonHome to /srv/http/trac/venv/ ... *** Operational MODE: single process *** ImportError: No module named trac.web.main unable to load app 0 (mountpoint='') (callable not found or import error) I think uWSGI isn't using the virtual env. When inside the virtual env, I can import trac.web.main without having an ImportError. How can I do that ? Thanks

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• Windows Server 2008 is stuck at "configuring updates - stage 3 of 3 - 0% complete"

  - by Chris

  This has happened the last two times I've done updates to this system, and I really have no idea what is going on. It is installing a only a month's worth of updates. It only responds to ping and no services are up, so I can't view the system remotely (I have to hook up a monitor to see this message). In the past I've just restarted the system at this point and it eventually finishes updating. I want to know what I can do to avoid this situation, how to diagnose what is going on, and how to get any kind of remote access during the updates. Edit: I can start the machine in safe mode (where I did nothing but backup some files). I restarted and it no longer tries to do a windows update, just goes to the desktop where everything seems extremely broken. I can click on some things, but not launch most programs. I guess all I can do at this point is do a system restore or something.

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• Why are my hardware tabs disabled for my VMWare player image?

  - by djangofan

  I just installed a Ubuntu 10.10 image on VMWare player and after I finished installing I was messing with the hardware settings and I did the following: 1. disabled the floppy device 2. changed the CDRom to "use system cdrom" 3. tried to enable the VMWare tools but it complained that the vm was in "Easy Install" mode After I fiddled with the VM now my floppy and 2 CD rom devices as well as sound card and USB settings are all disabled in the VM hardware settings. Any idea on why this occurred and how to fix it?

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• ASUS P5B Plus motherboard - no any drives found - how to restore RAID array?

  - by Moha

  We have a small server machine with an ASUS P5B Plus motherboard and 4 SATA HDDs. The HDDs were configured in a RAID10 array. Up until now, everything worked fine, but now the system doesn't recognize the drives. BIOS is set to RAID, jMicron controller is set to RAID, yet I can't see any of the drives in the BIOS setup, and jMicron BIOS tells me "no any drives found" The HDDs all spin up, I hear no clicking sounds or anything that would suggest HDD error. I did a search on this problem and replaced the SATA cables as suggested, but nothing's changed. What I have in mind is checking the CMOS battery and resetting the BIOS to use IDE mode, but I don't know if it will ruin the RAID system on the HDDs. It is not a critical server and there's only one database running on it (which I have backup of), but I don't want to setup the server from scratch if not necessary. What should I try to restore the RAID array and put the server back to working order?

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