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• Which version control should I use for my configuration files?

  - by rakete

  I want to store some of my configuration files (~/.emacs.d/, .Xdefaults, etc. linux $HOME stuff) in version control so I can easily sync them with my notebook/workplace and see my past changes and revert to them should the need arise. So far it seems to me that there are quite some people using git for this and I think that I too want to use a distributed vcs for this (if only to get more used to them) but I can't say that I am very experienced with all things dvcs. I did use darcs and git briefly and so far I can say that I really like the way git handles branches, and I think the possibility to have different branches within the same directory is especially useful for my use case. Darcs on the other hand has cherry picking of patches, which too is quite the convenient feature when managing configuration files (at least I assume it is). So, what would you recommend to use? And what would be your reasoning for your recommendation? What other vcs with nice feature that I haven't mentioned exist and would make a good vcs to store configuration files and why?

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• Installing Windows 7 over PXE, preferably with domain autojoin

  - by Ivan Vucica

  At an educational non-profit, I've inherited a previously set-up Windows domain that, after the first reinstall of the machines, we ended up not using by simply not joining machines back into the domain. Over last summer, before the annual reinstall for shipping machines to the summer school, I toyed with the idea of installing Windows 7 over network, instead of just imaging the machines. It took a bit longer than I expected to figure out the basics; honestly, I expected that Windows would be more friendly for PXE installation out of the box. What I'm interested in is best practices for installing Windows 7 over PXE with domain autojoin. I'd love it if the whole setup could optionally be hosted on a UNIX based system as well. I've had some success by preparing an ISO using Windows Deployment Kit, and loading the ISO into memory. This was needed since I wanted a menu, and I think I couldn't get PXELINUX to chainload into Windows' bootloader. Unfortunately, I couldn't figure out much about customization of the Windows setup in that timeframe nor could I get Samba to work properly; studying the stuff ended up being too lengthy, especially the portion where I edited a disk image on Windows and copied it outside. WDK didn't make things easier by mounting the disk image into RAM, and writing it in its entirety when done with it, making me a very sad boy. I've recently found a different approach, too, that appears to be closer to Microsoft's original idea for netboot deployment and does not involve ISOs. So my question boils down to the following. What exact approach do you use for netbooting Windows 7 setup? How can Windows 7 setup be best customized to be completely unattended, including installation on specific system partition and not destroying the data partition, creation of passworded admin and default user, choice of MAC-address-based hostname, and joining a domain? As much details as possible for everyone's future reference would be appreciated. WDS isn't a bad choice, but if a Linux-based install can be used, that'd be better.

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• How to Install OS without DVD and USB boot

  - by Timothy James Reed

  I just purchased a used Dell F1D 1U rack mount server and would like to install Ubuntu or ESXi with Virtual Disks or anything for that matter. I'v read that Dell's have built in DRAC so you can access it remotely. There are 3 ethernet plugs in the back but I dont know which one to use. In the BIOS it says I can configure Remote access on [com1] or [com2] not sure if that is ethernet 1 & 2. I also set it up so to use a static IP adress. Thats as far as I have gone. Not sure what to do next. I'v Tried to do a PXE server with TFTP but get stuck at Error "cant locate file" or something like that. Not even sure I want to go that route anymore because of all the hassel of editing files. All my computers are OSX or Linux and the only Windows I have is via VMWare. What steps to i do now?

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• How to set up port forwarding on a dedicated server running CentOS 5.4 to use Ubuntu 9.0.4

  - by mairtinh

  The basic situation that I have is a dedicated server running CentOS 5.4 At the moment I have one VM running Ubuntu 9.0.4. Later on, I will want to add another VM running Windows Server 2003 but at the moment I am focusing on getting Ubuntu up and running. The Ubuntu installation is working fine but I'm seriously struggling to get port forwarding working so that I can access websites to be hosted on the Ubuntu VM. As a newbie to Linux, I am confused about the relationship between IPTables and VMWare's own port forwarding. Here's what I've tried so far. The IP of my server is xxx.xxx.xxx.xxx and the provider support have told me that the subnet mask is 255.255.255.0, the gateway address is xxx.xxx.xxx.1 and the network address is xxx.xxx.xxx.0. (Those latter two surprise me a bit, I expected private gateway/network address rather than public ones.) First of all I tried Bridged Networking but had no success at all in communicating with the machine other than through the VMware console. I tried pinging it from the host (using ssh into the host) but no joy; also no Inernet access from the VM. I changed the interfaces configuration from DHCP to Static, using a static address of 192.168.1.100 and setting the gateway to xxx.xxx.xxx.1 as advised by the provider. No real difference, still cannot ping the guest from the host or vice versa and no Internet access from the guest. Then I tried NAT. The host automatically set the IP address to 192.168.132.128 with a gateway of 192.168.132.2 Now the guest has Internet access out and when I do a VNC to the host and open Firefox with 192.168.132.128 I can see the hosted website okay but I still cannot get into it from outside. I mentioned that I'm a bit confused about IPtables and VMware port forwarding, what I meant is that I'm not sure whether IPtable forwarding should be set to the IP address of the guest interface (192.168.132.128 in this case) or the gateway address 192.168.132.2 . I have a feeling that I'm missing something very simple here, can anybody tell me what it is?

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• append $myorigin to localpart of 'from', append different domain to localpart of incomplete recipient address

  - by PJ P

  We have been having some trouble getting Postfix to behave in a very specific fashion in which sender and recipient addresses with only a localpart (i.e. no @domain) are handled differently. We have a number of applications that use mailx to send messages. We would like to know the username and hostname of the sending party. For example, if root sends an email from db001.company.local, we would like the email to be addressed from [email protected]. This is accomplished by ensuring $myorigin is set to $myhostname. We also want unqualified recipients to have a different domain appended. For example, if a message is sent to 'dbadmin' it should qualify to '[email protected]'. However, by the nature of Postfix and $myorigin, an unqualified recipient would instead qualify to [email protected]. We do not want to adjust the aliases on all servers to forward appropriately. (in fact, every possible recipient doesn't have an entry in /etc/passwd) All company employees have mailboxes on Exchange, which Postfix eventually routes to, and no local Linux/Unix mailboxes are used or access. We would love to tell our application owners to ensure they use a fully qualified email address for all recipients, but the powers that be dictate that any negligence must be accommodated. If we were to keep $myorigin equal to $myhostname, we could resolve this issue by having an entry such as the following in 'recipient_canonical_maps': @$myorigin @company.com However, unfortunately, we cannot use variables in these map files. We also want to avoid having to manually enter and maintain the actual hostname in 'recipient_canonical_maps' for each server. Perhaps once our servers are 'puppetized' we can dynamically adjust this file, but we're not there yet. After an afternoon of fiddling I've decided to reach out. Any thoughts? Thanks in advance.

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• IIS crashes with unhandled exception in ASP.NET

  - by SnowCrash

  We had an issue recently with an unhandled exception in an ASP.NET C# application bringing down IIS and all application pools that it was hosting. IIS Manager was unable to restart or stop/start the service and I was unable start IIS again after killing w3wp.exe in the task manager. A system reboot restored IIS to a running state; as a primarily Linux admin, I generally consider an unplanned system reboot to resolve a software error to be an act of high heresy. Is there a way to "harden" IIS so that a faulting application does not affect anything but the request that exposes the fault? Some details on the server and application fault. IIS: 7.5 .NET: 4.0 Windows Server 2008 R2 Faulted on call to System.Net.Dns.Resolve() with a url pointing to a non-existant domain as the argument. (I'm aware that this method is deprecated but the point that a page code issue shouldn't bring down the server still stands) The exception generated was SocketException. The faulting module according to event viewer was KERNELBASE.dll The issue was resolved by wrapping the call in a try-catch, logging the exception and displaying some generic content on the page. I'm hoping that I missed something in the IIS config that would switch it to "production" mode or something.

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• Firefox not using Kerberos despite being configured to

  - by Nicolas Raoul

  I am deploying Linux/Firefox on a corporate Kerberos network. I followed this Kerberos-on-Firefox procedure but still Firefox does not connect via the company's Kerberos. I am using Firefox 3.0.18 on RedHat EL Server 5.5 Here is what I did: Run kinit on the command line to create a Kerberos ticket Check with klist: the ticket is valid until tomorrow, service principal is krbtgt/[email protected]. In Firefox, set network.negotiate-auth.trusted-uris and network.negotiate-auth.delegation-uris to .dc.thecompany.com. Load the company's portal page via its full hostname: http://server37.thecompany.com/alfresco. (note: server37 is actually the machine I am running Firefox on, but that should not be a problem I guess) PROBLEM: the company's intranet portal still serves me the login/password page. The same portal correctly uses Kerberos on Internet Explorer/Windows 7 machines, same settings, and shows the user's personal page. The server does not see any Kerberos request coming. Did I do something wrong? I enabled NSPR_LOG_MODULES=negotiateauth:5 as explained here, but the log file stays empty.

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• Different approaches to share files over local network

  - by exTyn

  I know, that I can use Google to find methods to share files over local network [1]. But, I have never shared files over local network, and I want to do this in a good, professional way. Also, this could be a good community wiki, I think. Well, what I am asking for, is: what are pros and cons of different methods to sharing files ofver local network? In my case, I need to share files between Linux & Win 7, and I want it to be secure (= without access for anyone else but me & people in my room). Another question (connected with above topic) is about playing music over the local network. Let's say, I live with 2 other guys in a room, one of us have speakers and we want to collaborate in creating playlists (e.g. everyone is choosing 3 songs to be played). Is it possible? How to do this? I am asking this question on SuperUser, because it (question) is connected with hardware & software (network, connecting computers, software for managing playlists in network etc.). I think it is most accurate place for such question (I have considered SO and SF). [1] And I have already done this! But, I do not have an experience in this field (sharing files over local network), do I am asking about pros and cons.

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• How to check DVD integrity at max read speed of DVD writer

  - by ashishsony

  I need to check the integrity of burned DVDs so that I can be sure about my backed-up data. I use DL-DVDs to take the backup. Earlier I used VSO Inspector software for the same but the day I switched to DL-DVDs the VSO Inspector gives me errors upon checking. I think the errors are because the switching of layer writing involves some dummy data somewhere. Secondly, it's damned slow for checking. I believe if there is a utility that can read all files (not the disk surface) and report if some files are unreadable would do the job. But it should be quick! Nobody wants to sit for disk checking for 3-4 hours after a quick 30 min data burn! I am looking for such a utility on Windows or Linux. Even scripts (python, etc) will do. I just want to be assured that the data is safe. Can someone help me in this? Thanks.

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• my X server doesn't load a module called "glx", but my video drivers seem to be installed

  - by rumtscho

  I just got a new, very wide monitor (2560x1440) and there is no sense maximizing my applications. So I installed Compiz Config Settings Manager and enabled Grid. Nothing happened, the shortcuts don't move application windows. Went to System - Preferences - Appearance, the Visual effects tab. It at "disabled". When I try to set them to "normal" or "extra", a message box appears telling me that it's searching for video drivers, then disappears, and I get an error message "Desktop effects could not be enabled". I opened Xorg.0.log, and had errors there: (EE) Failed to load /usr/lib/xorg/modules/extensions//libglx.so (II) UnloadModule: "glx" (EE) Failed to load module "glx" (loader failed, 7) (II) LoadModule: "extmod" Going to Administration - System - Hardware drivers, it said that there are no available and/or installed hardware drivers. But apt-get said that it cannot install nvidia-glx-185, as it is already installed. Googling my error message suggested that I install and run something called envyng. This let me install the nvidia drivers again, and now I can see in the Hardware Drivers window that they are installed and active. But the error message in Xorg.0.log remains, and I still cannot enable the Compiz effects or use Grid. Now, I don't have enough Linux experience to understand if this is a single cause-effect-chain of problems, or three independent ones, but I'd appreciate help for any of them. I am running Ubuntu 9.10, the video card is a GeForce 7600GS.

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• knife on Windows inconsistently reads ~\.ssh\knife.rb on Management Workstation

  - by gWaldo

  I am implementing a new instance of (Open-source v10.12) Chef in an existing environment. Currently the environment is mostly Windows, but more Linux is being introduced. I have used Chef in a previous gig, however that was a *nix-only environment. Because this is a primarily-Windows environment, my main workstation is Windows 7 (x64), and I use Powershell as my main terminal. I created a ~\.chef directory, populated with a knife.rb and my client.pem file. When I run knife client list from ~, I get the expected results. I keep my work in Dropbox just in case my laptop should fail or be stolen. When I run knife client list from the repo directory (C:\Users\waldo\Dropbox_company\projects\chef`), I get ERROR: Your private key could not be loaded from C:/home/waldo/.chef/waldog.pem Check your configuration file and ensure that your private key is readable (Note that the path is incorrect) This is the progression as I walk up the tree towards my ~ running knife client list: C:\Users\waldo\Dropbox\_company\projects\ => Above error C:\Users\waldo\Dropbox\_company\ => Above error C:\Users\waldo\Dropbox\ => It works! (Expected results) C:\Users\waldo\ => Expected results C:\Users\waldo\Documents\ => Expected Results C:\Users\waldo\Documents\GitHub => Expected Results C:\Users\waldo\Documents\GitHub\aProject\ => Expected Results What. The. Eff! Now, I know that I can add -c path\to\knife.rb, but that's a HUGE PITA. Question is: Why is knife inconsistently reading my ~\.chef\knife.rb, and how can I get around that without incurring carpal tunnel?

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• Remote Socket Read In Multi-Threaded Application Returns Zero Bytes or EINTR (104)

  - by user39891

  Hi. Am a c-coder for a while now - neither a newbie nor an expert. Now, I have a certain daemoned application in C on a PPC Linux. I use PHP's socket_connect as a client to connect to this service locally. The server uses epoll for multiplexing connections via a Unix socket. A user submitted string is parsed for certain characters/words using strstr() and if found, spawns 4 joinable threads to different websites simultaneously. I use socket, connect, write and read, to interact with the said webservers via TCP on their port 80 in each thread. All connections and writes seems successful. Reads to the webserver sockets fail however, with either (A) all 3 threads seem to hang, and only one thread returns -1 and errno is set to 104. The responding thread takes like 10 minutes - an eternity long:-(. *I read somewhere that the 104 (is EINTR?), which in the network context suggests that ...'the connection was reset by peer'; or (B) 0 bytes from 3 threads, and only 1 of the 4 threads actually returns some data. Isn't the socket read/write thread-safe? I use thread-safe (and reentrant) libc functions such as strtok_r, gethostbyname_r, etc. *I doubt that the said webhosts are actually resetting the connection, because when I run a single-threaded standalone (everything else equal) all things works perfectly right, but of course in series not parallel. There's a second problem too (oops), I can't write back to the client who connect to my epoll-ed Unix socket. My daemon application will hang and hog CPU 100% for ever. Yet nothing is written to the clients end. Am sure the client (a very typical PHP socket application) hasn't closed the connection whenever this is happening - no error(s) detected either. Any ideas? I cannot figure-out whatever is wrong even with Valgrind, GDB or much logging. Kindly help where you can.

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• Finding useful crash-information in Windows 8 Consumer Preview

  - by Lukas Knuth

  I'm currently diving into C# and wanted to play around with the new Metro-styled-applications introduced with Windows 8, so I updated my Windows 7 to Windows 8 Consumer Preview. The problem I'm facing right now is, that the system freezes after 3-5 minutes. It does not take any input from the keyboard or mouse and it does not recover (at least not in less then 10 minutes). Since I have a background in Linux, I'd like to find some information about the cause of the freeze, but I have no idea where to search. I checked the system-logs (under "System Control" - "Management") but they only record that the system was shut down unexpectedly (doe to the face that I held down the power-button to reboot the PC). There is no useful crash-information in there. I don't want to spend hours on randomly reinstalling drivers and doing things that "might help". Isn't there any place I can find some useful information about the freeze? Before you ask: I installed Windows 8 as an updated on my old Windows 7 installation (which worked fine by the way). My hardware fits the minimum requirements (specs can be found here, the MacMini 3,1 model with 2GHz processor). I have updated the graphics-card drivers to the newest Windows 8 drivers from nVidia.

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• Configuring three monitors with two Radeon X1600/X1650 graphics cards under Ubuntu

  - by cpm

  I have three SyncMaster 932a monitors I want to use with two Radeon X1600/X1650 cards under Linux. I am running X.org X Server 1.6.0, as provided by Ubuntu's Wubi installer. After turning off mirroring, I ended up with this xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" EndSection The left monitor had a menu bar and a task bar, the center monitor was just desktop, and windows would maximize to the current monitor. The third monitor and second graphics card weren't being used at all. Then I changed my configuration to manually specify each card with their PCI bus: Section "ServerLayout" Identifier "TheLayout" Screen 0 "Radeon Screen 1" Screen 1 "Radeon Screen 2" RightOf "Radeon Screen 1" EndSection Section "Screen" Identifier "Radeon Screen 1" Monitor "Configured Monitor" Device "Radeon the First" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "Radeon Screen 2" Monitor "Configured Monitor" Device "Radeon the Second" EndSection Section "Device" Identifier "Radeon the First" Driver "radeon" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Radeon the Second" Driver "radeon" BusID "PCI:2:0:0" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Now both the left and right monitors have task bars and menu bars. Windows cannot be dragged from the first two monitors to the third monitor. Also, maximizing in the left or center window fills both monitors. I also tried adding Option "Xinerama" "true" to the ServerLayout section. X11 wasn't able to start up. I want to: Allow moving windows along all three monitors. Maximizing only fills the current monitor. Either have menu/task bars on only the left monitor or all three monitors How can I make this possible?

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• Tomcat Solr times out

  - by user568458

  (Plesk 10.4 centos 5.8 linux apache2 server, with Tomcat5 on port 8080 and Apache Solr) I get "The connection has timed out" on requesting domain.com:8080 or www.domain.com:8080 or ip.ad.dr.ess:8080 Every reason I can find why this might be seems not to be the case: Plesk thinks Tomcat is running fine and lists it as an active service. The firewall currently has an accept all rule on port 8080. There's nothing relevant in the catalina tomcat logs (/var/log/tomcat5) - just some stuff from last time tomcat was started. There's no record at all of the requests that fail. netstat -lnp | grep 8080 gives the following, which I beleive means Tomcat is listening to requests to port 8080 on all ip addresses from any ip and any port (please correct me if I'm wrong): : tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 4018/java This covers every cause of this time out that I can find - so I must be missing something fundamental. It seems Tomcat is running, listening to the right port, is getting an appropriate IP address, is not obstructed by a firewall and is not failing after receiving a request in a way which would be recorded in the logs (so I believe it can't be out of memory, or anything like that). I'm all out of ideas on how to continue debugging this. I must have overlooked something obvious. Can anyone help?

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• MySQL Not Turning On

  - by Shalin Shah

  I have an amazon ec2 instance running on the Amazon Linux AMI and its a micro instance. I wanted to install Django onto my server so I entered these commands wget http://www.mlsite.net/blog/wp-content/uploads/2008/11/go wget http://www.mlsite.net/blog/wp-content/uploads/2008/11/django.conf chmod 744 go ./go So after I was done, I ran sudo service httpd restart and sudo service mysqld restart and This is what came up for mysqld: Stopping mysqld: [ OK ] MySQL Daemon failed to start. Starting mysqld: [FAILED] So I deleted the django files /usr/local/python2.6.8/site-packages/django_registration.egg and I tried finding the error and I found out that in my /etc/my.cnf for the socket, it said socket=/var/lock/subsys/mysql.sock so I went to /var/lock/subsys/ and there was no mysql.sock. I tried creating one using vim but it still didn't work. Then I checked the error log and it said Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) So I am pretty much lost right now. I know it has something to do with mysql.sock If you might know a reason why this was caused could you please let me know? I have a wordpress site on my server, so i kind of need MySQL to work. Thanks!

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• open-source LAMP package for simple accouting and receiving?

  - by user26664

  Hello. I am involved with a computer-based charity where we take donation of old equipment, often recycle it, mostly rehabilitate it and make it available through grants and 'adoptions', and sell some items. What we're looking for is a LAMP package that can handle our records of donations of equipment, print receipts for donators, and also track our thrift store sales with receipts. Donators will want receipts of their donations for tax deduction purposes. We'll want to print reports of incoming items from time to time, say monthly and yearly. For the thrift store, we'll also need receipts for that, reports of cash, especially for reconciling cash drops, and also reports of items sold from time to time. I'm thinking this might be a single package, but it might be two. We don't want to track our shop inventory with either of these programs -- that's another program/project. We just need to know what was donated and what was sold. It must be open source, and ideally we'd like it to run on LAMP -- Linux, Apache, MySQL, PHP, but we will consider other open-source platforms.

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• Setting up a network where packets are traced

  - by Marcus

  My situation is the following: I have an internet connection, which is shared between people. More or less obviously, people is using it to download illegal stuff. Since I'm the owner of the connection, I want to avoid being sued. I don't want to prevent the people from doing the things they want, but I want to be legally safe. Now, I have relatively little competences in network administration, so I was wondering: is it possible to setup a network, where the source and destination of the packets are logged? I would use this to prove, in case of lawsuit, that the traffic was coming from a given machine. if the idea is feasible, is there any wireless router on which I can install linux, where I can install the packet sniffer? how much space could the logs take (containing only the timestamp/source/destination), per GB of traffic? a very rough estimation would be very helpful. if a machine on my network is sending bittorrent packets to a certain IP, would this log be able to reflect the time, source ip and destination ip? I assume that obviously the torrent data would be encrypted and un-decryptable. Am I missing something? Is there a better strategy? Any pointer to documentation would be helpful as well - in that case, I would use this as starting point.

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• Build suggestion for mini itx server [on hold]

  - by Spyros

  I am looking to create a home server and since there does not seem to be a nice ready made one to purchase, i thought of building a mini itx one. I am not familiar with the best hardware/case to pick and therefore i thought i would ask for your experience. I will most probably install a simple linux distro, probably Debian and most probably without a desktop environment as well. Therefore, I am not looking for the best graphics card, though a decent one is preferred for sure. I would say that the most important thing is that the case/hardware play well with each other and the machine has decent specs ( i think something like 8gb RAM and 1TB hdd is most probably my most important things). I understand that this question can be closed as subjective, but it would be a great help for me if some of you guys who have been doing a similar build, can suggest something. I tried to find a stack exchange variant for the question, but it seems that this one more closely relates to the subject. But I will definitely understand it if people close it due to being subjective in nature. If you can maybe move it somewhere or so, please feel free to do so. Thank you for your time :)

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• VirtualBox VM running web server not accessible via external IP

  - by mwigdahl

  I have a Windows 7 machine running VirtualBox with an Ubuntu guest. The guest has a Bitnami LAMP stack installed. I have the guest configured for Bridged networking, and I can access the guest web server just fine from other machines on my LAN using the guest's IP. I'm trying to configure port forwarding so that I can access the web server from outside my LAN. (The router is a 2WIRE model as I'm on ATT's UVerse). I've set up port forwarding for ports 80 and 443 to the guest's IP in a similar manner to how I had them set up for my previous, physical web server, which worked just fine. However, I cannot seem to access the new, virtual web server using my external IP on the forwarded port. I suspected Windows Firewall issues on the host, but disabling it didn't solve the issue. Anyone have advice on what I should try next? EDIT: I've now attempted disabling the firewall on the guest with sudo ufw disable -- that doesn't seem to help either. However, after checking the router's port forwarding in more detail I may see the problem. My VM is named "linux" and in the router's configuration pages it shows up inconsistently. Sometimes it reports with a valid LAN IP and other times it doesn't show up with any IP. Even when it shows the correct IP the router indicates that it is disconnected. Could this be an indication that the 2WIRE router doesn't play well with VirtualBox's bridged networking mode?

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• Errors with Using Webcam

  - by C.G.

  I have been having some issues accessing a webcam from my machine. Sometimes (not always) when I run a program that accesses the device (cheese, guvcview, and code using openCV), I get either of two messages, which lead to the program crashing. The first occurs after running the webcam for some time. libv4l2: error dequeuing buf: No such device VIDIOC_DQBUF: No such device The other will occur without even letting me have a chance to run the webcam. libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON - Unable to start capture: No space left on device Occasionally after getting these errors I will also receive a message saying that no such device can be found for subsequent runs. Other than the times that the "No device found" message appears the webcam appears when I use lsusb. My machine runs Linux Fedora 16, and the webcam is a Logitech C920. I do have ffmpeg installed, and I have been able to run the web camera many times in the past without errors. What is particularly puzzling about these errors is that they just sprung up this past weekend. No new software or hardware has been installed on this machine recently; I haven't changed any settings recently either. It could possibly be a driver issue, but I don't know what could have changed which could lead to this issue. Any attempts at researching this problem has been fruitless as this seems to most commonly occur with multiple webcams. I am only working with one device. I'd appreciate any advice for this problem, as this has become a bit frustrating.

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• Bad Mumble control channel performance in KVM guest

  - by aef

  I'm running a Mumble server (Murmur) on a Debian Wheezy Beta 4 KVM guest which runs on a Debian Wheezy Beta 4 KVM hypervisor. The guest machines are attached to a bridge device on the hypervisor system through Virtio network interfaces. The Hypervisor is attached to a 100Mbit/s uplink and does IP-routing between the guest machines and the remaining Internet. In this setup we're experiencing a clearly recognizable lag between double-clicking a channel in the client and the channel joining action happening. This happens with a lot of different clients between 1.2.3 and 1.2.4 on Linux and Windows systems. Voice quality and latency seems to be completely unaffected by this. Most of the times the client's information dialog states a 16ms latency for both the voice and control channel. The deviation for the control channels mostly is a lot higher than the one of the voice channels. In some situations the control channel is displayed with a 100ms ping and about 1000 deviation. It seems the TCP performance is a problem here. We had no problems on an earlier setup which was in principle quite like the new one. We used Debian Lenny based Xen hypervisor and a soft-virtualised guest machine instead and an earlier version of the Mumble 1.2.3 series. The current murmurd --version says: 1.2.3-349-g315b5f5-2.1

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• BIND returns serverfail when querying for its authoriative domain

  - by estol

  Hi there Serverfault folks! First of all: sorry about the title, I had some problem coming up with the proper title. I have a little home server set up, for internet sharing, samba, basic http, dlna mediaserver and what not, and I happend to have a domain at hand, so I thought why not direct it to this computer? I have a BIND 9.8.0 installed, and - afaik - configured it properly. For a few days, the public view did not worked, and I really did not cared, since the local view worked. But now suddenly, even the local view fails. If I try to query the nameserver for anything in my domain, it returns the following error: $ nslookup andromeda.dafaces.com ;; Got SERVFAIL reply from ::1, trying next server ;; Got SERVFAIL reply from ::1, trying next server Server: 127.0.0.1 Address: 127.0.0.1#53 ** server can't find andromeda.dafaces.com.dafaces.com: SERVFAIL Also, the public view points to the old ip address of the domain, probably because of the same error. Some information about the system: $ uname -a Linux tressis 2.6.37-ARCH #1 SMP PREEMPT Tue Mar 15 09:21:17 CET 2011 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 5000+ AuthenticAMD GNU/Linux $ named -v BIND 9.8.0 And the named.conf file: # cat /etc/named.conf // // /etc/named.conf // include "/etc/rndc.key"; #controls { # inet 127.0.0.1 allow {localhost; } keys { "dnskulcs"; }; #}; options { directory "/var/named"; pid-file "/var/run/named/named.pid"; auth-nxdomain yes; datasize default; // Uncomment these to enable IPv6 connections support // IPv4 will still work: listen-on-v6 { any; }; listen-on { any; }; // Add this for no IPv4: // listen-on { none; }; // Default security settings. // allow-recursion { 127.0.0.1; ::1; 192.168.1.0/24; }; // allow-recursion { any; }; allow-query { any; }; allow-transfer { 127.0.0.1; ::1; 92.243.14.172; 87.98.164.164; 88.191.64.64; }; allow-update { key "dnskulcs"; }; version none; hostname none; server-id none; zone-statistics yes; forwarders { 213.46.246.53; 213.26.246.54; 8.8.8.8; 8.8.4.4; 192.188.242.65; 193.227.196.3; 2001:470:20::2; }; }; view "local" { match-clients { 192.168.1.0/24; 127.0.0.1; ::1; fec0:0:0:ffff::/64; }; recursion yes; zone "localhost" IN { type master; file "localhost.zone"; allow-transfer { any; }; }; zone "0.0.127.in-addr.arpa" IN { type master; file "127.0.0.zone"; allow-transfer { any; }; }; zone "." IN { type hint; file "root.hint"; }; zone "dafaces.com" IN { type master; file "internal/dafaces.com.fw"; allow-update { key "dnskulcs"; }; }; zone "1.168.192.in-addr.arpa" IN { type master; file "internal/dafaces.com.rev"; allow-update { key "dnskulcs"; }; }; }; view "public" { match-clients { any;}; recursion no; zone "dafaces.com" IN { type master; file "external/dafaces.com.fw"; allow-transfer { 87.98.164.164; 195.234.42.1; 88.191.64.64; }; }; }; //zone "example.org" IN { // type slave; // file "example.zone"; // masters { // 192.168.1.100; // }; // allow-query { any; }; // allow-transfer { any; }; //}; logging { channel xfer-log { file "/var/log/named.log"; print-category yes; print-severity yes; print-time yes; severity info; }; category xfer-in { xfer-log; }; category xfer-out { xfer-log; }; category notify { xfer-log; }; }; All help would be highly appreciated! EDIT: Zone files: # cat /var/named/internal/dafaces.com.fw $ORIGIN . $TTL 3600 ; 1 hour dafaces.com IN SOA tressis.dafaces.com. postmaster.dafaces.com. ( 2011032201 ; serial 28800 ; refresh (8 hours) 7200 ; retry (2 hours) 2419200 ; expire (4 weeks) 3600 ; minimum (1 hour) ) NS tressis.dafaces.com. A 192.168.1.1 MX 10 mail.dafaces.com. $ORIGIN _tcp.dafaces.com. _http SRV 0 5 80 www.dafaces.com. _ssh SRV 0 5 22 tressis.dafaces.com. $ORIGIN dafaces.com. acrisius A 192.168.1.230 andromeda A 192.168.1.7 andromeda-win7 CNAME andromeda aspasia A 192.168.1.233 athena A 192.168.1.232 callisto A 192.168.1.102 db A 192.168.1.1 management A 192.168.1.1 ; web management for the router functions haley A 192.168.1.5 hoth A 192.168.1.101 mail A 192.168.1.1 satelite A 192.168.1.20 sony-player A 192.168.1.103 TXT "310f16de2d2712dfc4ae6e5c54f60f828e" torrent A 192.168.1.1 tracker A 192.168.1.1 tressis A 192.168.1.1 www A 192.168.1.1 zeus A 192.168.1.231 and # cat /var/named/external/dafaces.com.fw $ORIGIN . $TTL 3600 dafaces.com IN SOA ns.dafaces.com. postmaster.dafaces.com. ( 2011032405; serial 28800; refresh 7200; retry 2419200; expire 3600; minimum ) NS ns.dafaces.com. NS ns0.xname.org. NS ns1.xname.org. NS ns2.xname.org. A 89.135.129.37 MX 10 mail.dafaces.com. $ORIGIN dafaces.com. ;Szolgaltatasok _ssh._tcp SRV 0 5 22 tressis _http._tcp SRV 0 5 80 www ns A 89.135.129.37 hoth A 89.135.129.37 www A 89.135.129.37 mail A 89.135.129.37 db A 89.135.129.37 torrent A 89.135.129.37 tracker A 89.135.129.37 Edit: Ohh, hell I almost forgot. Since the node is connected to the internet via a residential connection, there is a possibility, that the public ipv4 address will change(but thank god, it is a very rare case), so I daily update the external IP address in the zone file with a shellscript: # cat /etc/cron.daily/dnsupdate #!/bin/sh FILE="/var/named/external/dafaces.com.fw" SERIAL=$(date +%Y%m%d05) PUBLIC_IP=$(ifconfig internet |sed -n "/inet addr:.*255.255.255.255/{s/.*inet addr://; s/ .*//; p}") cat $FILE | sed --posix 's/^.* serial$/\t\t\t\t\t'$SERIAL'; serial/' | sed --posix 's/[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*/'$PUBLIC_IP'/' > /tmp/ujzona mv /tmp/ujzona $FILE /etc/rc.d/named reload

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• How can I enable pid and ppid fields in psacct dump-acct?

  - by annavt

  I am currently using the psacct package on Centos to perform accounting on processes run by users. The info file1 suggests that it is possible to output pid and ppid depending on what information your operating system provides in it's struct acct. pid and ppid are listed in /usr/include/linux/acct.h on my system: struct acct_v3 { char ac_flag; /* Flags */ char ac_version; /* Always set to ACCT_VERSION */ __u16 ac_tty; /* Control Terminal */ __u32 ac_exitcode; /* Exitcode */ __u32 ac_uid; /* Real User ID */ __u32 ac_gid; /* Real Group ID */ __u32 ac_pid; /* Process ID */ __u32 ac_ppid; /* Parent Process ID */ ... But pid and ppid are not output when I run dump-acct: # dump-acct /var/account/pacct.1 | tail awk | 0.0| 0.0| 81.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 tmpwatch | 0.0| 0.0| 1.0| 0| 0|3816.0|Thu Nov 24 04:03:04 2011 cups | 0.0| 0.0| 4.0| 0| 0|8728.0|Thu Nov 24 04:03:04 2011 awk | 0.0| 0.0| 4.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 runlevel | 0.0| 0.0| 0.0| 0| 0|3804.0|Thu Nov 24 04:03:04 2011 chkconfig | 0.0| 0.0| 0.0| 0| 0|3840.0|Thu Nov 24 04:03:04 2011 inn-cron-expire | 0.0| 0.0| 0.0| 0| 0|8728.0|Thu Nov 24 04:03:04 2011 awk | 0.0| 0.0| 0.0| 0| 0|8792.0|Thu Nov 24 04:03:04 2011 gzip | 5.0| 0.0| 9.0| 0| 0|4044.0|Thu Nov 24 04:03:04 2011 accton | 0.0| 0.0| 1.0| 0| 0| 0.0|Thu Nov 24 04:03:04 2011 Is it likely that there is no support in my kernel for this feature or that my psacct version does not support this? How can I add pid and ppid to my accounting logs? CentOS release 5.6 Kernel 2.6.18-238.19.1.el5 psacct 6.3.2 Thanks in advance Anna

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• Why is my connection slow?

  - by Jay R.

  I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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