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• Ubuntu issues when moving hard disk to new system

  - by Tim

  I'm working on a legacy project with a small single board computer running Ubuntu 10.04 on a compact flash card. I need to be able to save away a working image (via dd) and copy said image to other compact flash cards for use in other single board computers (with identical hardware) I'm able to copy the image to other flash cards and bootup on other systems no problem. But I'm seeing strange behavior. For instance, I can't use sudo on the new system (“sudo: must be setuid root”). I've gone down the path of trying to fix this, but have run into a slew of other issues. General question is: what do I need to be aware of when moving a hard disk containing Ubuntu (in my case a compact flash card) to another computer? I was hoping it would be seamless to Ubuntu since it's moving to a system with identical hardware. Is there something that needs to be done to make it "portable"?

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• Does multiple files in SQL Server when using RAID help reduce conflicts in growth and file-locking?

  - by Dr Giles M

  I've been reading around and get the impression that if you are using RAID then using multiple SQL Server files within a filegroup won't yeild any more improvements, and the benefits are purely administrative (if you started to run out of space or wanted to partition off data into managable chunks for backups/balancing the data around your big server room). However, being a reasonably savvy software person, it's not unthinkable to hypothesise that, even for smaller databases that SQL Server will perform growth and locking operations (for writes) on a LOGICAL file basis, so even if you are using RAID, it seems to make sense to have multiple files in a file group to balance I/O, or does the time taken to reconstruct the data from distributed filegroups outweigh the benefits of reduced locking? I'm also aware that the behaviour and benefits may be different for tables/indeces/log. Is there a good site that distinguishes the benefits of multiple files when RAID is already in place?

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• Mutli-processor workstation as a workstation/server

  - by posdef

  I work in a research institute and a number of programs we use are computationally intensive (I actually wrote one of them). Right now we have one computer that is dedicated for one of these programs (with local accounts only, as in users physically sitting in front of that pc) and the other programs are run on individual workstations assigned to people. I have been looking around to common brands such as Dell and HP, for a some sort of a small/medium scale server, which can be used as a workhorse by sending tasks remotely. It appears as if there is nothing in between workstations with one 6-core processor and a bunch of extras (like fancy graphics etc) and rack mount servers with ridiculous amount of RAM and HDD expansion capabilities but still relatively little number of processors/cores. I wonder if what I am looking for is such a small niche product? Are there other solutions that I might not be aware of? Does anyone know of a multi proc- multi-core workstation/server that is still within the reasonable

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• Securely wiping a file on a tmpfs

  - by Nanzikambe

  I have a script that decrypts some data to a tmpfs, the directory is secure (permissions), the machine's swap is encrypted (random key on boot) and when the script is done it does a 35 pass wipe (Peter Gutmann) of the cleartext on the tmpfs . I do this because I'm aware wiping files on a journaling file system is insecure, data may be recovered. For discussion, here're the relevant bits extracted: # make the tmpfs mkdir /mnt/tmpfs chmod 0700 /mnt/tmpfs mount -t tmpfs -o size=1M tmpfs /mnt/tmpfs cd /mnt/tmpfs # decrypt the data gpg -o - <crypted_input_file> | \ tar -xjpf - # do processing stuff # wipe contents find . -type f -exec bcwipe -I {} ';' # nuke the tmpfs cd .. umount -f /mnt/tmpfs rm -fR /mnt/tmpfs So, my question, assuming for the moment that nobody is able to read the cleartext in the tmpfs while it exists (I use umask to set cleartext to 0600), is there any way any trace of the cleartext could remain either in memory or on disk after the snippet above completes?

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• Is using Capistrano for user maintenance tasks on university lab feasible?

  - by danielkza

  I've been looking around for tools to replace some legacy scripts for creating and maintaining accounts in a university computer lab ecosystem consisting of things like: LDAP and Kerberos for authentication User home storage and web pages Entries on an SQL database Printing quotas Mailing lists, etc. I'd also like to automate machine and VM membership for Kerberos and Puppet if possiible. I've found Capistrano, and while the basic principle of running tasks on remote hosts through SSH seems to fit, and the DSL in Ruby looks quite nice, I've found most documentation is related to application deployment, not generic tasks. I'm also not aware of any good way to parameterize tasks so I can pass on the user information for creation. Is something about Capistrano I am missing, or is it not the correct tool for this job? Are there any more userful alternatives?

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• User for MSSQL 2008 Service Accounts

  - by Campo

  I want to create a Domain User that runs the SQL Service Accounts. The reason for this is that I have setup mirroring and MS recommends having the same user (a domain user account) running the services across all the the computers in the configuration to ensure mirroring will work properly. Right now in the test environment I just had them run under my user for simplicity. But now that I know what I am doing I would like to test the configuration more accurately. I am also aware that it makes things much simpler if this user is an administrator. My question is. Should I just create a simple user SQLSERVICEUSER and make it an administrator? Seems a little insecure to me. Anyone have a more elegant solution?

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• Is there any descent open-source search engine solutions?

  - by Nazariy

  Few weeks ago my friend asked me how hard is it to launch your own search engine service with list of websites that suppose to be crawled time to time. First what come at my mind was Google Custom Search however pricing policy is quite tricky and would drain your budget if you reach 500K queries per year. Another solution I found here was SearchBlox, which can be compared to Google Mini service. It's quite good solution if you planing to cover search over small amount of websites but for larger projects it is not very handy. I also found few other search platforms like Lucene, Hadoop and Xapian which seems to be quite powerful solutions to reach Google search quality, and Nutch as a web crawler. As most of open-source projects they share same problem, luck of comprehensive guidance of usage, examples and it's expected that you are expert in this subject. I'm wondering if any of you using this solutions, which of them would you recommend, and what should I be aware of?

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• How do you change your Airport or Ethernet MAC address in Mac OS X 10.6?

  - by Dave Gallagher

  I have a MacBook Pro and would like to set a custom MAC address for either my Airport WiFi card, or Ethernet port. In older versions of Mac OS X, you could do it like this: $ sudo ifconfig en0 ether 00:11:22:33:44:55 // Ethernet $ sudo ifconfig en1 lladdr AA:BB:CC:DD:EE:FF // Airport For it to work on Airport, you'd have to power it on (e.g. $ sudo ifconfig en1 up), ensure it's not connected to any wireless network, and execute the command. I'm aware such a change won't propagate across reboots. Unfortunately, this doesn't work on Mac OS X 10.6.6 anymore. Apple appears to have removed the functionality (the command fails silently). Does anyone have any idea how to do it? Thanks for any help you can offer! :)

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• Display aspect ratio problem on netbooks?

  - by Jian Lin

  Last night in a computer store with the midnight sale of Windows 7, I see many netbooks, all are 1024 x 600 resolution. Then when the CPU meter and the Clock gadget were added, the CPU meter looked spherical, but the clock (the second clock -- the silver one) looked somewhat oval. Later on I went to all the desktops and both the CPU meter and the clock were spherical. So do the netbook have this "aspect ratio" problem? It is not a big deal but it'd be nice to know if I get a netbook and know that it is common on the netbook. (and aware that the picture and photos will be slightly distorted). Update: All the netbooks were at 1024 x 600, which was their "native" resolution. Every single one of them showed an oval shaped clock. None of the desktop had that issue.

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• Wikimedia Commons not working properly from IE 8

  - by Johannes Rössel

  It happens fairly often that a page on Wikimedia Commons doesn't load in IE. This happens to me on both machines I use, each one Windows 7 with IE 8. The page just loads endlessly (or connects—can't really tell) and timeouts after a while. Repeated attempts (trying to load the same page in 5 to 10 tabs) sometimes work, but sometimes it takes a lot more tries. As far as I can tell, no other program is affected—Firefox or PowerShell have no trouble loading the page. Also, when I use Fiddler it seems to load fine on the first try as well. Anyone has an idea what might be going on? I didn't change any settings that I am aware of (and most likely didn't do so in the same way on both machines). Preemptive note: I don't need advice in the form of »Use another browser instead.«.

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• Using Ctrl-Tab to switch between tabs in Mac Terminal.app

  - by dkee

  How can I make Ctrl-Tab and Ctrl-Shift-Tab switch between tabs in Terminal.app on a Mac (OS 10.4 and 10.5 specifically)? This is how I switch tabs in Firefox and Aquamacs, and Command-Shift-[ and Command-Shift-] is too awkward to me. I am aware of this related question: .../unable-to-switch-a-tab-efficiently-in-macs-terminal* And hence the Keyboard Shortcuts section of the System Preferences, but the dialog box for Keyboard Shortcuts doesn't seem to accept Ctrl-Tab in the Keyboard Shortcut field. Is there a special keyboard sequence for inputting tabs (with modifiers) into a dialog box field on a Mac? Is there any other method that would allow me to customize Terminal.app in the way I desire? Not really a programming question, but I think the answer would be useful to other folks that program on Macs and would like to have some consistency between interfaces of different applications. Thanks! * Couldn't add the hyperlink as a new user

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• Use a webpage as a screen saver

  - by Stephen

  We have a number of retail stores that sell laptops. There are a number of display models on show in each retail store. At the moment screen savers are used to promote different offers and these screen savers are out of date. What I would like to do is open up a browser on these machines and just use a webpage. This way I can control exactly what is displayed and keep it up to date with our latest offers. Is it possible to have the webpage in full screen mode, with no address bar or tabs visible. As far as I'm aware these are Windows machines, probably running Windows Vista or Windows 7. Any help appreciated.

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• How to send a popup message to unknow computer connected to my WLAN?

  - by Leandro

  Is there any way to send a popup message from a Linux systen to a "random" laptop/tablet/mobile linked to my Wireless network ? For example, if I let my WLAN open and I see a not recognized computer connected to it, is there anyway to send to that device a message ? On the other hand, if I am connected to someone else open network and they may or may not be aware that their network is open, can I send them a message warning that I am accessing their network? Probably for a completely "random" device the answer should be no. But if we restrict to laptops with Win7 or Linux SO is there any service running by default on such systems that allows one to send such popup messages ? PS: I have no practical motivation for this question. This is only a curiosity.

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• FortiGate firewall configuration with /30 and /28 networks

  - by slyderc

  I have fiber coming in from a new ISP which is being handed off via Ethernet on a single physical port. I'm having doubts about how to approach the configuration on my FortiGate 200A firewall because I've been given a /30 containing the ISP's gateway and another /28 for external IPs I can use: x.y.76.12/30 (.13 is the GW) x.y.76.64/28 (public IP space) How do I configure the FG200A's WAN1 interface to be aware of the two networks? As I only have one physical ISP port, will I need to plug it into a switch to break-out two cables and use a DMZ port on the FG200A for setting up the /28? Thanks in advance for your insight!

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• Remote site AD design (2003)

  - by Boy Mars

  A remote site has about 25 of our 50-ish employees. They have their own AD domain presently (2003) but I want to look at getting them onto the same global domain for ease of access/administration. The remote site has a VPN link but line speeds are very poor. I am already aware of tools like ADMT and have done a few migrations in the past (NT/2003 domains), but this is the first time I have the luxury of designing how this domain is organised. So I'm looking for tips on good AD design; would a remote site be better served as a sub-domain? would this reduce traffic? I am only currently looking at 2003 since only existing machine will be used.

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• Bandwidth sizing for simultaneous RDP sessions

  - by Gareth Marlow

  We're doing some DR scenario planning which will require up to 150 users to RDP into their desktop machines (mainly running Windows XP) over our VPN. We have a 2mbit uncontended internet connection at the moment but there's scope to upgrade this and also to use a secondary SDSL line to give us more bandwidth. Typical bandwidth figures I've seen suggest to plan for 64kbps per session, which works out to 9.6mbps in total. I'd like to know: Does anyone have any real-world data which would support these estimates? Are there any operational 'gotcha's that we need to be aware of? Thanks!

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• Problem in accessing Services Panel Windows 7

  - by Everest

  Hello friends i have Windows 7 x64 bit Ultimate installed and i am having problems in accessing the Services Panel from Administrative tools option. the problem is that the Services panel is showing a blank screen when the default Extended option is selected. i am unable to figure out the problem that whether it is related to the installation of windows 7 or any file goes corrupt which i am not aware of. here is the URL for the problem which i am referring to : http://i47.tinypic.com/mrzdcm.jpg Kindly please help me out as i am unable to find where the problem is as i do not want to format and then reinstall the system. Thanks

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• Automatically download files in Internet Explorer without getting prompted to Save / Cancel?

  - by dimbasint

  I am currently using IE7 with XP SP3. When a webpage download with unknown file type loads, I get a prompt asking me what I want to do with the file. My options are FIND SAVE CANCEL. How do I make it so that I don't get this popup prompt, but Internet explorer automatically downloads the file into a directory I choose without asking? PS. I have already tried Tools Internet Options Security Internet Custom Level Downloads Disable/Enable/Enable, but this doesn't help. Thanks for the reply. Unfortunately I have to use IE. I'm using it in connection with other proprietary software based on IE and its settings. And yes I'm aware it's not a great browser. (This is not for strictly personal use in the browsing sense. )

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• How can I monitor network traffic in an all Mac home network?

  - by raiglstorfer

  I have an all Mac network consisting of an Airport Extreme, 1 MacPro, 1 Mac Mini, 2 MackBook Pros, 2 iPads, and 2 iPhones. The Mac Pro is connected directly to the Airport Extreme via Cat5 and the rest is all running via Wireless. Lately I've been getting prompted by Google to enter Capchas frequently. The message states that I might have software running on my network I'm not aware of. My wireless router is password protected using WPA2 Personal and I frequently change my password so I don't think someone is using the network from outside (but I've no way to confirm this). I'm looking for a relatively cheap (preferably open source) solution that would enable me to monitor and profile the network usage by machine and port. Can someone recommend a solution?

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• XAMPP pointing a file outside root folder

  - by Ravi

  I am using XAMPP for first time in Mac. Running out problems accessing other than root folder(htdocs).when I am placing my web application inside htdocs with default httpd.conf file it works when I try to point my web application url in httpd.conf it throws error I am aware that to modify the root folder I need to do changes to my XAMPP/etc/httpd.conf file With Default XAMPP MAC Settings, I am trying to change Server root,Document root and Directory in XAMPP/etc/httpd.conf file the following ServerRoot "/Users/ravi/Documents/Development/Backbone/backboneboilerplate" DocumentRoot "/Users/ravi/Documents/Development/Backbone/backboneboilerplate" <Directory /> Options FollowSymLinks AllowOverride All Order deny,allow Deny from all </Directory> <Directory "/Users/ravi/Documents/Development/Backbone/backboneboilerplate"> Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> its throwing error when trying to start XAMPP httpd: Syntax error on line 54 of /Applications/XAMPP/xamppfiles/etc/httpd.conf: Cannot load /Users/ravi/Documents/Development/Backbone/backboneboilerplate/modules/mod_authn_file.so into server: cannot create object file image or add library

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• How can I trap errors for an application that is tightly coupled with IIS?

  - by PeanutsMonkey

  We have an unsupported application that relies on IIS however intermittently brings out the website it is integrated with. I have looked at the logs and there is nothing in the logs to indicate what the issue could be as the logs only have GET verbs. I have also looked at the event viewer and there are no error logged in there either. The application runs off a Windows 2008 server. Is there a freely available application we can have running in the background that will listen to or is aware of the application running and traps the error when it crashes? The unsupported application is a bespoke implementation for which we don't have code for and the developer is no longer contactable.

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• Are there any security concerns when using Windows' default workgroup?

  - by koiyu

  Are there any security concerns one should be aware of if you're using Windows' default workgroup as the workgroup? (Or is worrying just tinfoiling?) Should it be commonplace to rename the workgroup to something personal/unique after Windows installation? Are there any other benefits in renaming the workgroup from the default besides making it to look more describing? Ie. is renaming worth the hassle as it makes the workgroup generally less accessible? It is used in local area network after all.

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• Why would a server not send a SYN/ACK packet in response to a SYN packet

  - by codemonkey

  Lately, we've become aware of a TCP connection issue that is mostly limited to mac and Linux users who browse our websites. From the user perspective, it presents itself as a really long connection time to our websites (11 seconds). We've managed to track down the technical signature of this problem, but can't figure out why it is happening or how to fix it. Basically, what is happening is that the client's machine is sending the SYN packet to establish the TCP connection and the web server receives it, but does not respond with the SYN/ACK packet. After the client has sent many SYN packets, the server finally responds with a SYN/ACK packet and everything is fine for the remainder of the connection. And, of course, the kicker to the problem: it is intermittent and does not happen all the time (though it does happen between 10-30% of the time) We are using Fedora 12 Linux as the OS and Nginx as the web server.

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• Smartcards for storing gpg/ssh keys (Linux) - what do I need?

  - by Ninefingers

  Hi All, I'm interested in storing my SSH keys and gpg keys on a smartcard for added security. However, I'm a bit uncertain on a few points, which are as follows: How many keys can I get on a card? I assume both SSH and GPG can store keys on the card. Is there a limit to key size? I see a lot of cards saying they support 2048-bit keys, what about larger sizes? Hardware: can anyone recommend a card/reader combination that works well? I've done a fair amount of research and it seems PC/SC readers can be a bit iffy - is this your experience? Have I missed anything I should be asking? Are there any other hurdles? I'm aware fsf europe give away cards with membership - I'm not sure I want to join, but... are these cards any good?

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• How do I fix a corrupt .cab file?

  - by j03lar50n

  In Windows XP, I have a folder of install files- an .exe pointing to 3 Setup.cab files. As the install progresses, it hangs on Setup2.cab as it installs tutorial_page.chm (a Help file). I have 3 options when it hangs: Abort, Retry and Ignore. Both Abort and Ignore rollback the install and exit. But if I keep pressing Retry the install will progress & this action has successfully installed the program (eventually) for me. I AM WONDERING IF I CAN EXTRACTRE-PACKAGE THE .CAB? From the installed program can I grab the help.chm file and replace it into Setup2.cab for a successful install? I am aware of the Microsoft Cabinet Software Development Kit http://support.microsoft.com/kb/310618 and How To Manually Modify and Rebuild CAB Files http://support.microsoft.com/kb/176810 but 1.)want to ask if this is even possible & 2.)don't know how to make a .DDF file for Makecab.exe

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