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• HUGE MAC FILTER and scripting

  - by user195917

  I make an dhcp server on CentOS, and i apply a mac filter for my clients. Now, with a small number of clients (max 10) ,is not that hard, but what I will do with 2000 clients? My idea was to create a list (ex. "macfilter.lst") and this list, to be updated after a database. I have tow questions. First: How do i create a filter in IPTABLES that takes info`s from a file (file hosted on server) Second: Any idea about how to write a script, that update a file after a database?? Thanks so much for your help.

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• Resized NTFS partition, now it wont mount.

  - by H4Z3Y

  I have had a 1.5TB drive used as an external for 6 months or so, then I decided to put it in my linux server for network storage. ntfs was being crazy inefficient so I wanted to change the filesystem to ext4. I used the ntfsresize command to reduce the partition to 650GB and that took abour 2 hours, then I deleted all of the entries in fstab like a guide told me too and created a new one the size of the ntfs partition, or, 650GB. after I modified fstab the ntfs partition would no longer mount and when plugging it in to windows it says "This Hard Drive needs to be formatted". any ideas on how I can recover the data off of the drive? I have 600GB of free space on a different drive so I just need some way of copying them off.

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• How do you pick what server setup you need?

  - by ed209

  I recently started receiving pubsub data feed from etsy. It averages around 250 notifications per minute. But obviously, when the USA wakes up that spikes quite heavily. I want to be able to deal with those spikes (about 3 per day) but the rest of day is fine. What's the best method of getting the right server configuration. My current approach is to keep upgrading until the server stops dying... next leap is: Processor: AMD Phenom II X6-1055T HEXA Core RAM: 4GB DDR2 SDRAM HD1: SATA Drive (7,200 rpm) (+500 GB 7200 RPM SATA hard drive) HD2: SATA Backup Drive (+500 GB SATA (7,200 rpm)) OS: Linux OS (+CentOS 5 64-bit) Bandwidth: 6000GB Monthly Transfer (3000 in + 3000 out) (+100M uplink port) What's the best approach to working out what sort of server setup you need?

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• Is rsync --delete safe in case of disk failure

  - by enedene

  I have two data hard drives on my Linux server and I use second as a backup for a first drive. I use rsync for that purpose. An example would be: rsync -r -v --delete /media/disk1/ /media/disk2/ What this does is that it copies every file/directory from /media/disk1/ to /media/disk2/ but also deletes any difference. For example, lets say that files A and B but not file C are on disk1, and on disk2 there is no A and B files, but there is C. The result would be that after the command on disk2 I'd have files A and B, but file C would be deleted, just like on disk1. Now, a rather disastrous scenario had crossed my mind; what if disk1 dies, system continues to work since system files are on my system disk, but when rsync tries to backup my data on disk2 from broken disk1, it deletes all the files from disk2 because it can't read anything on disk1. Is this a possible scenario, or is there a protection from it build in rsync?

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• Is it possible to replace the Logitech G500 wire without rebuying the mouse?

  - by leladax

  It has to be replaced ideally in whole, from the point it starts inside the mouse (with a white 4-5 piece of wires connection) to the end (of the USB connector to the computer) or at least to a considerable length because there is fatigue very near the mouse and the more I fix it there with soldering the closer it gets to being unfixable or reaching towards 'inside' the mouse where fixing it will be hard or impossible. So I wonder if there is a way to get a replacement of the whole thing or at least the inside-the-mouse connector to a certain length. Also I wonder if other mice types are identical in the connector of the inside.

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• emacs AucTeX:Turn off auto-fill-mode inside a particular LaTeX environment

  - by Seamus

  I like using auto-fill-mode for hard line wrapping. However, when I'm making a big tabular in a .tex file, I like using align-current to have the table look somewhat like it would when printed. The difficulty is that if I have a table that is longer than the line width, auto-fill-mode breaks it, and then align-current can't put things to rights and gets confused. Is there a way to tell emacs that when I'm between the \begin and \end tags of a particular kind of environment (in this case, tabular), don't word wrap...

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• Phantom Local Disks appearing in my drive list

  - by Paul

  I seem to have several phantom Local Disks mapped to different letters that are of 0 bytes in size. Strangely, they do not show up when I view my drives through Windows Explorer. But if I open an application such as ACDSee Pro or MS Word and then go to open a file I can see all these Local Disks mapped to different letters. This means when I plug in my external hard disk it ends up mapped to letter R instead of its usual G which messes up any programs I have pointing to it by default. How did they get there and more importantly, how do I get rid of them? I'm on a Window 7 Home Premium 32 bit machine.

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• How secure is cloud computing?

  - by Rhubarb

  By secure, I don't mean the machines itself and access to it from the network. I mean, and I suppose this could be applied to any kind of hosting service, when you put all your intellectual property onto a hosted provider, what happens to the hard disks as they cycle through them? Say I've invested million into my software, and the information and data that I have is valuable, how can I be sure it isn't read off old disks as they're recycled? Is there some kind of standard to look for that ensures a provider is going to use the strictest form of intellectual property protection? Is SAS70 applicable here?

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• How long until the chirping stops or what can I do to make it stop?

  - by MadBurn

  I know computers, I have been fixing them and building them for over a decade... but I don't know the exact electronics of them. My personal desktop PC is making an irregular, but constant, extremely high pitched chirping noise. I know this could be my hard drive, but I've heard that noise before and I believe this is a capacitor or part of the electronics. This noise is right at the edge of my hearing and I can feel it more than I can hear it. After a while, it starts to give me a headache and makes me physically sick. How long will this last? Is there anything I can do to fix it (short of replacing the entire motherboard)?

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• Windows Search Indexing SSD

  - by user654628

  I just bought a new SSD (Vertex4 from OCZ, 256G) and installed Windows 8 with it on my laptop. I am not using an external hard drive to keep extra data (paging, temp files etc) because I am using a laptop and do not want to carry it around with me. My question is, if I disable Windows indexer (Windows Search service), does Windows still search files under the search (Windows 7 Start menu search/Metro UI Windows 8 search)? Since the indexer was meant to search for files by indexing them, does this mean that Windows will not search new files? Thanks in advance.

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• Keyboard not responding during boot

  - by Peri

  My keyboard just stopped responding during boot. So I cannot go to BIOS or select system which I want to start. It is USB keyboard and it was working before. I borrowed PS2 keyboard and it also isn't working during boot. Lately I have been having problems with hard disk. Once every 2-5 minutes LED was on for 30 seconds and win7 wasn't responsive. I connected disk to another controller on motherboard and seems it is working now. All that suggests that to me that that motherboard is broken. What can I check? Or maybe you have some other suggestions?

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• 32 bit programs can't access Internet in Windows 7 64 bit

  - by korona

  I recently got a new ASUS laptop with Windows 7 Home Premium pre-installed. It worked OK for a while but a couple of days ago, suddenly I couldn't access the Internet any more. After narrowing down the problem, I've reached the conclusion that what's happened is that 32 bit programs are suddenly not able to use the Internet, but 64 bit applications work just fine. Examples of programs that DON'T work any more: Google chrome Firefox Internet Explorer 8 World of Warcraft Examples of programs that DO work: Internet Explorer 8 (64 bit) ping (command line) nslookup (command line) ftp (command line) I'm pretty sure that those command line apps are 64 bit native. A re-install of Windows using the recovery partition on the laptop did fix the problem temporarily, but now it's back again. And I seem to be stuck between a rock and a hard place getting someone to take the responsibility for this; the vendor says to talk to ASUS, ASUS says it's a software issue, and Microsoft doesn't give support on OEM licenses... Does anyone know how to solve this issue?

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• Reverse Proxy (mod_rewrite) and Rails (absolute paths)

  - by SooDesuNe

  I have front end rails app, that reverse proxies to any of a number of backend rails apps depending on URL, for example http://www.my_host.com/app_one reverse proxies to http://www.remote_host_running_app_one.com such that a URL like http://www.my_host.com/app_one/users will display the contents of http://www.remote_host_running_app_one.com/users I have a large, and ever expanding number of backends, so they can not be explicitly listed anywhere other than a database. This is no problem for mod_rewrite using a prg:/ rewrite map reverse proxy. The question is, the urls returned by rails helpers have the form /controller/action making them absolute to the root. This is a problem for the page served by mod_rewrite because links on the proxied page appear as absolute to the domain. i.e.: http://www.my_host.com/app_one/controller/action has links that end up looking like /controller/action/ when they need to look like /app_one/controller/action mod_proxy_html seems like the right idea, but it doesn't seem to be as dynamic as I would need, since the rules need to be hard coded into the config files. Is there a way to fix this server-side, so that the links will be routed correctly?

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• Error while mounting home directory on different logical volume

  - by RCola

  I created RAID 5 form 3 hard drives. Formatted as ext4 this raid array. Created VG0 group and lv_home logical volume in LVM. Then I tried to mount default /home directory on lv_home, while trying to mount logical volume lv_home to folder containing user profiles /home, getting error: mount: wrong fs type, bad option, bad superblock on /dev/mapper/VG0-lv_home next is seems to be symbolic link: # file -s /dev/VG0/lv_home /dev/VG0/lv_home: symbolic link to `../mapper/VG0-lv_home' then # file -s /dev/mapper/VG0-lv_home /dev/mapper/VG0-lv_home: data and lvm> pvs PV VG Fmt Attr PSize PFree /dev/md0 VG0 lvm2 a- 2.02g 68.00m lvm> lvdisplay --- Logical volume --- LV Name /dev/VG0/lv_home VG Name VG0 LV UUID WzJus7-2yV8-yhog-Ju1b-TpWH-IIAI-LIutwe LV Write Access read/write LV Status available # open 0 LV Size 1.17 GiB Current LE 300 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:0

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• Windows 7 does not 'wake up' from Sleep mode

  - by the watchmaker

  I'm new to Windows 7, so I don't know if this is normal. When the computer is idle for 30 minutes, the screen goes black and no key pressing or mouse movement will bring the computer out of standby. The computer is still running (fans and hard drive noise) but it will not respond and the screen remains black. The only way to get a response is to press and hold the power button until it goes off, then switch it back on. When it turns on it says "Resuming Windows" and then goes black again. Is this normal? Can the time-out delay be increased? Is there a better workaround than switching the PC on and off?

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• Do I need a Gigabit router with a 24MB/s down and 7MB/s upload speed cable modem?

  - by djangofan

  Do I need a Gigabit port capable wireless router with a 24MB/s down and 7MB/s upload speed cable modem? Does anyone know how to calculate this? FYI, I wont be using the wireless connection from my main computer system. My computer will connect via a hard wire into the router (of the wireless variety), which in turn is connected to the cable modem. My research suggests that the 100 MB/s port can easily handle it. Is that true?

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• HP 4530s: Fan is Always On even When Laptop/CPU is Idle

  - by tolitius

  Just bought an HP 4530s from newegg. Laptop is great, but.. The FAN is always on. I did some googling, found it is a known problem, but no easily googlable solution. Tried to: Update BIOS to the latest Disable "CPU fan always on when plugged in" BIOS setting Installed Windows 7 Home (came with), Live CDed Ubuntu, Windows XP Spent 2 hours with horrible HP support Some other things that I can't already recall = spent too much time on it Laptop is not refundable (learned it the hard way, after the fact, by looking at the NEWEGG clever policy that is hidden in "details") I would really appreciate a workable solution / workaround / hack. The laptop is for my friend who will most likely be running Windows XP/7.

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• Having internet on a VirtualBox

  - by S4M

  I am running a linux laptop and I set up a VirtualBox under windows XP. My only problem is the VirtualBox doesn't seem to be connected to internet - When I do the connection diagnosis it tells me there is no connection. I am using an NAT adapter, and I bind the port 80 from my computer to the port 80 of the VirtualBox, and same for the ports 8080, but still no result. I would be grateful is someone could help me to sort this out. EDIT: thinking of it, what is making the problem hard - and painful - is the absence of error message. If I try to use a given adapter to share my computer's connection with the VirtualBox, and it doesn't work, I have no way to know why. So, it would be really helpful if someone could share a way to access this king of information (is there a log file somewhere or a way to run VirtualBox from command line in a verbose mode?).

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• Could I replace a stock PSU fan with a more quiet one?

  - by GaryJL

  I have a cheap 450W PSU with an exhaust fan at the rear. This fan, however, is very loud. Is it a good idea to replace the stock PSU fan with a quiet fan with similar airflow? The PSU fan is hard-wired to the PCB in the PSU so I was intending on snipping the stock fan wires and sealing the loose ends with electrical tape. I would then connect the new quiet fan to the PWR_FAN socket on the motherboard. Has anyone done this before themselves? Is it a good idea in the first place? Considering if my PSU fails, it could take out a couple of other components too.

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• Tracing out going connections

  - by Tiffany Walker

  Jan 24 07:00:49 HOST kernel: [875997.380464] Firewall: *TCP_OUT Blocked* IN= OUT=eth0 SRC=108.60.11.15 DST=74.80.225.32 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=18789 DF PROTO=TCP SPT=64823 DPT=81 WINDOW=14600 RES=0x00 SYN URGP=0 Jan 24 07:00:50 HOST kernel: [875998.378321] Firewall: *TCP_OUT Blocked* IN= OUT=eth0 SRC=108.60.11.15 DST=74.80.225.32 LEN=52 TOS=0x00 PREC=0x00 TTL=64 ID=18790 DF PROTO=TCP SPT=64823 DPT=81 WINDOW=14600 RES=0x00 SYN URGP=0 I run fcgid so everything runs as a user. But is there a way to trace and figure out who is running an out going script? The sites all share the same IP so it's hard to know which site it is or where the script is located at.

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• Installing Chrome OS on HP Pavilion

  - by Lenny K

  Trying to install Chrome OS on HP Pavillion tx1000. I changed the BIOS to boot from USB before hard drive, and created a bootable USB drive (SanDisk Cruzer 4GB). No matter how many ways I try to make the USB drive, the laptop hangs on the startup screen, and trying to open the Boot Order Options freezes on "Fixed disk 0: ...". On the other hand, without the USB plugged in, the computer continues, and displays "Initialized Mouse", and then onto the Boot Order Options. If you let it boot normally from the beginning, it starts up fine into Windows Vista. I am using Hexxeh's Chrome OS build. Here are the different methods I've tried for making the Bootable USB Drive: Hexxeh's Image Creator (for Mac) Making the USB device bootable (using these directions). I wrote the image using Win32DiskImager. Writing the image using Win32DiskImager (without making it bootable).

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• What would cause a query being ran from SSMS on local box to run slower then from remote box

  - by Racter

  When I run a simply query such as "Select Column1, Column2 from Table A" from within SSMS running on my production SQL Server the results seems to take extremely long (45Min). If I run the same query from my dev system’s SSMS connecting to the production SQL Server the results return within a few seconds (<60sec). One thing I have notices is if the system was just rebooted performance is good for a bit. It is hard to determine a time as I have had it start running slow very quickly after reboot but at most it performed good for 20min and then start acting up. Also, just restarting the SQL service does not resolve the issue or provide a temporary performance boost. Specs for Server are: Windows Server 2003, Enterprise Edition, SP2 4 X Intel Xeon 3.6GHz - 6GB System Memory Active/Active Cluster SQL Server 2005 SP2 (9.0.3239)

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• Backup XAMPP (Htdocs & MySQL)

  - by Max

  I have a development server, but would like to backup everything at least daily to a remote location. I would like to backup the htdocs folder and the MySQL servers. But if possible also the settings of the server and anything else relevant. At the moment I am using DropBox for the htdocs, but this is not ideal. I have looked into Git, DropBox simple copy paste on a daily basis. I was wondering what any advice would be. For example how hard would it be to set it up as a cloud based system? Any and all advice is greatly appreciated.

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• why skype is not available on messengers like pidgin

  - by sterz

  i really like pidgin, empathy etc. (especially pidgin) because they gather all accounts like xmpp, msn etc. together except skype. i know skype uses a proprietary protocol but so does msn and it is available on pidgin. is it that hard to "put" skype on pidgin or alike messengers? what is the reason that skype is not implemented in pidgin? note: i know there is a plugin for pidgin to support skype but it requires the official skype client to be installed and running. pretty useless.

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• Micro Btx Motherboard Replacement.

  - by Judy

  I got the Vundo virus that took out the mobo and hard drive on my Gateway GT5220. Is there a replacement that will work? I'm willing to keep XP. I want to fix it the cheapest way possible. The mobo is a NVIDIA GeForce 6150 AM2 microBTX with primary IDE and 4 SATA connections. I want to use a new SATA as my primary, but would like to be able to connect my old IDE drives to transfer my pictures from them to the new drive. I would appreciate any help. Thanks!

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