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• Setting per-directory umask using ACLs

  - by Yarin

  We want to mimic the behavior of a system-wide 002 umask on a certain directory foo, in order to ensure the following result: All sub-directories created underneath foo will have 775 permissions All files created underneath foo and subdirectories will have 664 permissions 1 and 2 will happen for files/dirs created by all users, including root, and all daemons. Assuming that ACL is enabled on our partition, this is the command we've come up with: setfacl -R -d -m mask:002 foo This seems to be working- I'm basically just looking for confirmation. Is this the most effective way to apply a per-directory umask with an ACL?

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• Is it immoral to put a captcha on a login form?

  - by azkotoki

  In a recent project I put a captcha test on a login form, in order to stop possible brute force attacks. The immediate reaction of other coworkers was a request to remove it, saying that it was inapropiate for that purpose, and that it was quite exotic to see a captcha in that place. I've seen captcha images on signup, contact, password recovery forms, etc. So I personally don't see inapropiate to put a captcha also on a place like that. Well, it obviously burns down usability a little bit, but it's a matter of time and getting used to it. With the lack of a captcha test, one would have to put some sort of blacklist / account locking mechanism, which also has some drawbacks. Is it a good choice for you? Am I getting somewhat captcha-aholic and need some sort of group therapy? Thanks in advance.

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• need help in backing up 2 partitions to flash drive(Acronis)

  - by Nrew

  I'm trying it on virtual box and installed Acronis 2010. The backup was successful but when I checked on the backup which is on my flash drive. Here's my problem: Ive installed firefox before the backup, but the program files folder in the flash drive has no folder called firefox. How do I restore the the 2 partitions using the backup. What I did was to: Go to tools & utilities in Acronis then chose clone disk. Selected the source and destination(flash drive). Then I restart, the backup began. First with the first partition which has xp installed and the 2nd was vista lite. What do I do to restore it: I only got these folders on the root of the flash drive: Documents and settings Program files Windows BOOTSECT.BAK

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• RAID 1 after install and two controlers

  - by jfreak53

  I have question regarding RAID 1. Can I setup software RAID 1 after having installed the first drive and setup ubuntu 12? I know that during server install and partitioning I can select RAID and setup then, but what I am not clear on is how in the world to setup RAID 1 after the fact? Can someone provide directions for this? Also, can I RAID 1 two drives one being 500GB and the mirror drive being 1TB? Of course the mirror drive would have a 500GB partition but that's my point. Lastly, can one drive be on IDE and the other on a SATA controller? I know speed will be an issue, that doesn't matter, I just need to know if it will work without corrupting data and if it's the same process? Thanks.

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• Help looking before I leap! I need expert guidance...

  - by Ellen Reddick

  27" iMac running win7 under bootcamp (slick! ). I have Access 2003 program with files linked through ODBC used by 4 installations (all with Access 2003 installed). I want to buy Access 2010 and try it under virtual PC (under Bootcamp). Will it work (since I have to install the ODBC drivers)? If I decide after this trial that I like what it does, can I then install it under the Windows 7 bootcamp partition (with or without uninstalling the virtual PC) without using up the 2nd allowed installation? Also, I see that MS allows an Office Pro 2010 trial download good for 60 days. Would this work in Windows 7 Virtual PC and would it be a better way to go, followed by a legitimate purchase of Access 2010 for the Windows 7? This is not an Access programming question--I realize there may be some tweaks necessary in the program to run it under 2010 and I can handle that part.

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• Why does compressing and decompressing my SSD hard drive free up space?

  - by Paperflyer

  I bought an SSD (SandForce 2), created a tiny 25GB partition on it for Windows and installed Windows 7 64-bit. In order to free disk space, I enabled compression on the drive using the Properties entry in the context menu for the drive in Explorer. Prior to compressing I had around 5GB of free space. After compression I had 4GB, so compression was not working for me. I figured this might have happened because of the built-in data compression of the SSD. I decompressed the files again - after decompression, it left me with 7GB of free space! Better yet, after restarting, I had 10GB. What is happening here?

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• How to create Restoration Partion?

  - by Fellknight

  For some time now, when buying new computers (laptops in particular) from big name brands-like DELL, HP, TOSHIBA, etc.-most of them come with a "rescue" or "restore" partion instead of installation CD/DVD. Said partitions have everything needed to rebuild the factory installed OS, unfortunately they also include all crapware that the OEM installed on the machine. Is it there a way to custom create such a partition with out all the useless software included?. They seem quite appealing considering they only use about 10GB-20GB of space and offer the pretty much the same functionality as a complete system image/backup.

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• Boot Camp: is it possible to restart directly to Windows from Mac OS X?

  - by Jonik

  With the Boot Camp tools installed on Windows, there's an option for rebooting directly to Mac OS ("Restart in Mac OS X" from Boot Camp system tray item). But is this possible in the opposite direction? In other words, instead of the procedure 1) "Restart", 2) wait for OS X to shut down, 3) hold Option key (?), and 4) select the Windows partition, can I tell my Mac to restart so that Windows is selected on the next boot? Something like "Restart in Windows" which would let me bypass steps 2-4. NB: I want to keep Mac OS X as the default OS; I'm just looking for a convenient shortcut when normally running OS X and occasionally wanting to boot to Windows.

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• Catch unhandled exception of invisible thread

  - by user346804

  In my C++ application i use an activeX component that runs its own thread (or several I don't know). Sometimes this components throws exceptions. I would like to catch these exceptions and do recovery instead of my entire application crashing. But since I don't have access to its source code or thread I am unsure how it would be done. The only solution I can think of is to run it in its own process. Using something like CreateProcess and then CreateRemoteThread, unsure how it could be implemented. Any suggestion on how to go about solving this?

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• Visual Studio Development on Virtual Box, Boot Camp, or VMWare Fusion

  - by Eli

  I currently have a Mac, 2ghz and 2 gigs of ram, running OS X Leopard and Virtual Box with a Windows 7 Pro 32bit virtual machine. Performance on the virtual machine is fine for minor tasks but is very clunky while trying to multi-task or develop in Visual Studio 2008. What would be my best option for being able to use Visual Studio, keeping cost and time in mind? 1) Upgrade ram to 4 gigs ($100). Will this really improve my performance enough to use Visual Studio in a Windows 7 vm? Or am I just wasting time/money? 2) Reinstall/restore Windows 7 disk image as a Boot Camp partition. I assume this should improve my performance, yes? 3) Purchase VMWare fusion instead of VirtualBox. Does Fusion require less resources to run? I am open to any suggestions. Thanks in advance

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• Is there a program that will show a tree of the differences in two file trees?

  - by Huckle

  In windows I manually back up from time to time by formatting my external drive and copying the contents of my data partition over. Inevitably there is a difference in the number and size of the files copied because of system files, etc. Is there a program that would diff two directories recursively and compile the differences into a nice GUI tree that I could peruse (preferably filter) to ensure that everything I want made it over to the drive? It should only show files that are not in both directories. (Also, please ignore the inadequacy of my backup solution)

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• Is there a Linux kernel boot parameter to configure an IPv6 address?

  - by aef

  I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ip=192.0.2.1::192.0.2.62:255.255.255.192::eth0:none I'm looking for an equal parameter for IPv6 configuration. I couldn't find anything about this in the kernel documentations. Update: Because of a lot of you asked why I would need this: The idea to use a kernel configuration came up related to this problem. I suspect the regular boot-up interface configuration is not done, because the interfaces are already up. The reason for this could be that I'm using a pre-boot environment with a Dropbear SSH server to allow me to unlock my encrypted root partition. The IP addresses for this environment are configured through GRUB with the ip= parameter. There is no DHCP or Router Advertisement available on that Ethernet segment and as this is the uplink segment provided by a large hosting company, there is no way to change that fact.

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• Can a power loss break an hard disk?

  - by dag729

  Today I was working when all of a sudden a power loss (in the entire house) occurs. I tried to reboot the machine but it states that there's an "Ebios error"; tried with an Ubuntu 9.04 live cd and while booting it states that there are various I/O errors on the first partition (the one with the boot sector). Now I managed to backup all of my data (using the live cd aforementioned) but I don't know if it'll worth the hassle of a reinstallation (and if it could do something useful) or if the only thing to do is to drop the hard disk as far as possible... Thanks in advance.

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• How to automatically take daily HDD backup?

  - by user13107

  I think my HDD might have crashed. I don't want to lose data if this happens again. I have dual boot Windows/Ubuntu system. What is the best way to backup data and other software settings in Ubuntu? I don't care much about Windows partition, important stuff is in Ubuntu. I have 1 Tb external HDD (laptop HDD is of 500 gb total). One way would be to run rsync every day (or via cronjob) to backup everything to external HDD. What might be better ways of achieving this (backup)? Also are instant backup software recommended? Are there any disadvantages of instant backup as opposed to daily rsync?

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• Windows: Should I install Server or stick with regular?

  - by stalker92

  I hope somebody can help me solve my dilemma. I have my home PC (using Windows 7) which I use for both work and leisure (gaming, surfing, movies etc.) I tend to never turn it off, only when I must reboot because some installation requires me to or when the power gets lost. But, sometimes Windows starts acting weird (usually after the long period of system uptime), per example eats up randomly all the space on my system partition etc. which is solved after the reset by itself. I was thinking to switch to Windows Server, I guess that it is more optimized for long uptime, well, obviously it is meant for use on servers. Can somebody with more experience with this help me decide is it worth it, will it solve these issues connected with long uptime periods? Thanks in advance.

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• Solution for distributing MANY simple network tasks?

  - by EmpireJones

  I would like to create some sort of a distributed setup for running a ton of small/simple REST web queries in a production environment. For each 5-10 related queries which are executed from a node, I will generate a very small amount of derived data, which will need to be stored in a standard relational database (such as PostgreSQL). What platforms are built for this type of problem set? The nature, data sizes, and quantities seem to contradict the mindset of Hadoop. There are also more grid based architectures such as Condor and Sun Grid Engine, which I have seen mentioned. I'm not sure if these platforms have any recovery from errors though (checking if a job succeeds). What I would really like is a FIFO type queue that I could add jobs to, with the end result of my database getting updated. Any suggestions on the best tool for the job?

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• USB Format Error

  - by Dan Finan

  I'm having a real headache trying to reformat a USB drive. Initially it had a 200mb EFI partition and it caused the drive to disappear altogether. Since then I ran the CMD and wiped the disk using 'diskpart'. It took a few attempts but it finally cleaned the drive. Since then it has reappeared under (:E) however I am unable to access the drive and Windows is preventing me from reformatting it. I am just presented with 'Windows was unable to complete the format'. It's now acting like a CD drive instead of removable storage. I've tried going through Disk Management and I'm presented with the same error. I've removed the USB controllers from Device Manager - when the drive is connected again it re-installs the drivers and acts the same way. Any help given will be greatly appreciated, thank you. (Windows 7 machine)

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• Putting a whole linux server under source control (git)

  - by Tobias Hertkorn

  I am thinking about putting my whole linux server under version control using git. The reason behind it being that that might be the easiest way to detect malicious modifications/rootkits. All I would naively think is necessary to check the integrity of the system: Mount the linux partition every week or so using a rescue system, check if the git repository is still untempered and then issue a git status to detect any changes made to the system. Apart from the obvious waste in disk space, are there any other negative side-effects? Is it a totally crazy idea? Is it even a secure way to check against rootkits since I most likely would have to at least exclude /dev and /proc ?

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• What's the easiest way to upgrade a single laptop hard drive?

  - by rutherford

  My HD is coming near the end of it's life and I wondered if producing an image of the original was all that was required? What's the best software to use for this and how can I accomplish it - can I use my other laptop for the image file or do I need to buy an external HD to accomplish the clone? Does having several partitions of both FAT32 and NTFS with partition magic installed affect things at all? Is it just a matter of making the image, swapping in the new HD and copying the image to that?

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• Booting Windows off new SSD from grub boots old Windows instead

  - by wuputah

  After a new SSD install, I have: Original Windows 7 on sdc1 (to be retired) Copy of Windows 7 on sdb2 A Windows system partition on sdb1 Ubuntu 12.04 on sda, /boot and ergo grub is on sda1 Grub is MBR on sda and set to boot from BIOS. I prefer to not change this; grub is great! I've run update-grub (the Ubuntu grub scripts are, at present, unaltered) and grub seems to be correctly configured as all options are available: I can boot any of the 3 Windows partitions and Ubuntu. I also ran the repair tool to get Windows to add both installations to BCD. The problem: choosing particular options seem to have no effect; the old version of Windows on sdc1 always boots. I'm stumped! My thought was to only boot Windows off sdb1, and then let BCD do the rest (present a menu to boot between sdb2 and sdc1, but I can't seem to get BCD to boot sdb2), but this has been unsuccessful. Reference: BCDEdit output

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• Deleted All Snapshots, Now Won't Boot VM with Snapshot not found error

  - by Jharwood

  I've just tried deleting the snapshots from this virtual machine running ESXI5, so that I can grow the Thick Partition. I've now got the below error message when I try to start the VM, the VM also can't be grown above 0 MB i assume for the same reason as below. I've checked the datastore and the original VMDK is still there. Reason: The system cannot find the file specified. Cannot open the disk 'VM1-PG-000002.vmdk' or one of the snapshot disks it depends on. VMware ESX cannot find the virtual disk "VM1-PG-000002.vmdk". Verify the path is valid and try again. How do i tell ESXI5 to use the proper VMDK?

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• Linux cannot see Windows 7 partitions on install

  - by Nash0

  I've been trying to install Linux as a dual boot with Windows 7 on my Dell latitude e6510. It is currently running Windows 7 and I have used the MS disk tools to shrink the Win 7 NTFS partition to make room for Linux. The issue I'm having is that when I run Linux installers by boot from CD they see the entire hard drive as unallocated space. I have tried Ubuntu 10.10, Kbuntu 10.10 and Fedora 14 and they all have the same problem. I have also tried the Ubuntu "install in Windows" option and could not get it to work. EDIT: Booting Gparted 0.8.0 from a usb drive did not work. It reported the entire drive as unpartitioned.

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• When using RAID10 + BBWC why is it better to separate PostgreSQL data files from OS and transaction logs than to keep them all on the same array?

  - by Vlad

  I've seen the advice everywhere (including here and here): keep your OS partition, DB data files and DB transaction logs on separate discs/arrays. The general recommendation is to use RAID1 for OS, RAID10 for data (or RAID5 if load is very read-biased) and RAID1 for transaction logs. However, considering that you will need at least 6 or 8 drives to build this setup, wouldn't a RAID10 over 6-8 drives with BBWC perform better? What if the drives are SSDs? I'm talking here about internal server drives, not SAN.

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• Windows 7 - cannot access my own external disk

  - by Tomas

  I use Windows 7 Home Premium and external USB disk with NTFS partition. I cannot write-access the my own files on it, even as a member of Admnistrators group! Is there any way how to go around this permission checking, without actually writing some permission information to every folder on it? I have 3 external disks (up to 1TB), and I have thousands hundreds of files on each!!! Doing some permission change, that will actually go recursivelly through all folders on all my disks is plain brain damage!! 1) Is there any way how to change it somehow globally? (like mount options...) .. Or how to go around this annoying permission checking? It was working in Win XP normally! 2) if not, and I must do the recursive operation on all folders, how to do it PERMANENTLY, so that I don't need to do it again on another Windows 7 computer!

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• Where to look for regular scripts?

  - by fontan

  It seems to me that our server freezes every 30 days around noon due to the huge utilization of xvda data transfer partition - writes are 50 times higher than normally (according to the health monitor in plesk). This seems to me as the reason why the apache & co becomes instable as (for example) all apache's processes are waiting to write their log (according to the service's full status). I am, however, unable to find any scheduled task that would be executed during that period. I have checked both cron and anacron setup and there is only one monthly anacron task which is not executed (according to the /var/log/cron - and there is nothing unusual) around noon. Are there any other places where to look for periodical processes? (I am just about to ask server's provider the same question about any external maintenance run around this time but I don't expect them to run anything time/resource consuming during the day.)

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