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• How to mount a iSCSI/SAN storage drive to a stable device name (one that can't change on re-connect)?

  - by jcalfee314

  We need stable device paths for our Twinstrata SAN drives. Many guides for setting up iSCSI connectors simply say to use a device path like /dev/sda or /dev/sdb. This is far from correct, I doubt that any setup exists that would be happy to have its device name suddenly change (from /dev/sda to /dev/sdb for example). The fix I found was to install multipath and start a multipathd on boot which then provides a stable mapping between the storage's WWID to a device path like this /dev/mapper/firebird_database. This is a method described in the CentOS/RedHat here: http://www.centos.org/docs/5/html/5.1/DM_Multipath/setup_procedure.html. This seems a little complicated though. We noticed that it is common to see UUIDs appear in fstab on new installs. So, the question is, why do we need an external program (multipathd) running to provide a stable device mount? Should there be a way to provide the WWID directly in /etc/fstab?

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• How are suspected DoS attacks handled by webservers?

  - by Jan Kuboschek

  I rent a server somewhere out in Canada or so that I'm using to host a website of mine. That website has close to 400,000 pages that I wanted to index today. For that, I wrote a crawler a while back (see JCrawler on Stackoverflow.com). Now, I'm greedy and didn't want it to take too long so I ran multiple threads resulting in some 60+ requests per second from my IP. A couple minutes later, my server locked me out. I can still FTP into it, but I can't HTTP it. As server administrator or user, do you have any idea how servers usually handle these situations? Is it common to place a permanent or temporary ban on the IP or what is typically done? Naturally, I'll re-run my software with fewer requests once I'm back on.

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• Debian Squeeze can't install php-pear

  - by Lennier

  I use Debian 6.0.6 sudo apt-get install php-pear results in: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: initscripts : Breaks: console-setup (< 1.74) but 1.68+squeeze2 is to be installed Breaks: initramfs-tools (< 0.104) but 0.98.8 is to be installed Breaks: nfs-common (< 1:1.2.5-3) but 1:1.2.2-4squeeze2 is to be installed keyboard-configuration : Breaks: console-setup (< 1.71) but 1.68+squeeze2 is to be installed klibc-utils : Breaks: initramfs-tools (< 0.103) but 0.98.8 is to be installed E: Broken packages How can i solve it?

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• A space-efficient filesystem for grow-as-needed virtual disks ?

  - by Steve Schnepp

  A common practice is to use non-preallocated virtual disks. Since they only grow as needed, it makes them perfect for fast backup, overallocation and creation speed. Since file systems are usually based on physical disks they have the tendency to use the whole area available1 in order to increase the speed2 or reliability3. I'm searching a filesystem that does the exact opposite : try to touch the minimum blocks need by an aggressive block reuse. I would happily trade some performance for space usage. There is already a similar question, but it is rather general. I have very specific goal : space-efficiency. 1. Like page caching uses all the free physical memory 2. Canonical example : online defragmentation 3. Canonical example : snapshotting

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• Windows and domain suffix addition

  - by grawity

  I have a DNS domain and host it on my own server. My desktop PC (Windows XP) is configured to have mydomain.tld as its primary DNS suffix. Now, when the system tries to resolve any domain - stackoverflow.com, for example - it tries with the suffix added first, even if the name has periods in it. In other words, it tries stackoverflow.com.mydomain.tld. before stackoverflow.com.. Is this valid according to DNS standards and common sense? Is there anything I can do to prevent it, other than removing the prefix completely? (I still want it to be appended to single-component hostnames. Currently I have two prefixes . and mydomain.tld. configured, but it isn't very fast when resolving foohost.)

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• Got root, now how should I configure my server?

  - by L. De Leo

  I've been a developer for years and by trade I had to know a little bit of server side configuration. But now I find myself needing to manage my own VPS instance (Amazon EC2) and I'm lost. I'd like to know what are the common ways to configure an Apache and MySQL server that is secure and efficient. For example right now I'm doing everything as root but I doubt that's the best way at all. My whole Apache is configured to serve 1 site when I'd like it to be able to serve multiple sites. Where do I start?

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• How can I get bash to perform tab-completion for my aliases?

  - by dstarh

  I have a bunch of bash completion scripts set up (mostly using bash-it and some manually setup). I also have a bunch of aliases setup for common tasks like gco for git checkout. Right now I can type git checkout dTab and develop is completed for me but when I type gco dTab it does not complete. I'm assuming this is because the completion script is completing on git and it fails to see gco. Is there a way to generically/programmatically get all of my completion scripts to work with my aliases? Not being able to complete when using the alias kind of defeats the purpose of the alias.

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• Duplicate Name Exists error from virtual PC with NAT network configuration

  - by Phred

  Whenever I change the network configuration to NAT for a virtual machine running under Virtual PC 2007, I get "A duplicate name exists on the network." error. There is no other machine on my network with this name and running the VM in any other network configuration doesn't cause this error. This seems to be a common problem with Virtual PC 2007 based on a google search but no-one seems to have a solution to it. So far, I've discovered that turning off NETBIOS over TCP causes the problem to go away but I need to join this VM to a domain and you can't do that if NETBIOS over TCP is turned off.

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• Mail Secure & Stable Open Source Mail Server

  - by Fanar ALHAYALI

  I have asked question on http://stackoverflow.com/questions/9868426/i-need-to-know-which-email-server-i-have-to-use and someone tell me my question would be better on serverfault. I know that this is a common question and asked many times. but there are so many available mail servers that i am not able to decide the one. Kindly tell that which is the Secure, Stable and fast open source mail server for Centos or Redhat Server. Is there any guide which can be used to deploy the mail server with all its components e.g. smtp, pop3, imap, spam, calender server, antivirus, DNS Setting. Currently I'm using sun messaging V6 which installed on Solaris 10 and my boss ask me to make a report for the best mail server today in the marketing? I tried to have a look on Google but I couldn't find interesting information for my report. Any advice would be appreciated.

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• Failing Seagate HDD - Not Recognised

  - by thefragileomen

  I am having a look at a friend's computer which contains a 500GB Seagate HDD. Unfortunately the HDD is not recognised by the BIOS menu and it beeps 11 times upon powerup. I've moved the HDD to another laptop but the problem remains. I've downloaded SeaTools for DOS (Seagate's Diagnostic tool) but unfortunately to no avail and the disc remains unseen when using this DOS boot disc. The HDD is only 6 months old so I'm very surprised at this but it appears a common problem with Seagate 2.5" HDDs as well as other HDDs manufactured by Seagate. I intend to try it in an external caddy on Thursday when back in work and also through a forensic writeblocker but just wondering if anyone has any other suggestions? I am of the opinion it is some chip on the HDD board which prevents it spinning due to a fault. If so, I've lost to deactivate this just so I can simply recover the data on the drive and start with a new disc. Thanks

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• Suitable companion monitors for HP LP3065 30" primary monitor

  - by Bittercoder

  I have an HP LP3065 30" monitor - now I want to add a couple of companion screens to either side of it - I've heard to people suggesting 21" monitors in portrait mode - but it seems difficult to find a suitable panel these day, as 22" wide-screen monitors have become common, and I can't seem to find anything with a suitable 1600 pixel width. Can anyone recommend a suitable monitor, and suggest what criteria are best for picking a suitable monitor - what's important to consider - I'm thinking things like: Exact resolution match? Viewing angle? Small/thin bezel?

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• Title: Better logging for cronjob output

  - by Stefan Lasiewski

  I am looking for a better way to log cronjobs. Most cronjobs tend to spam email or the console, get ignored, or create yet another logfile. In this case, I have a Nagios NSCA script which sends data to a central Nagios sever. This send_nsca script also prints a single status line to STDOUT, indicating success or failure. 0 * * * * root /usr/local/nagios/sbin/nsca_check_disk This emails the following message to root@localhost, which is then forwarded to my team of sysadmins. Spam. forwarded nsca_check_disk: 1 data packet(s) sent to host successfully. I'm looking for a log method which: Doesn't spam the messages to email or the console Don't create yet another krufty logfile which requires cleanup months or years later. Capture the log information somewhere, so it can be viewed later if desired. Works on most unixes Fits into an existing log infrastructure. Uses common syslog conventions like 'facility' Some of these are third party scripts, and don't always do logging internally.

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• Why do mapped drives only reappear after logging out and back in, and not after a reboot?

  - by razumny

  I work in a corporate environment, where we use mostly Windows 7 Professional computers, though some legacy applications are still being run on Windows XP. We have security in place on the network not to allow access to network resources to computers that are not members of Active Directory. When logging in, our users get their home folder and a common network drive mapped to H: and F:, respectively. Sometimes, this does not happen, and the drives are not mapped. The solution is to have the user log off, and back in to Windows. If they reboot, the drives remain unmapped. Does anyone know why this may be?

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• Restore Point area getting deleted

  - by PaoloFCantoni

  Hi, I'm running a multi-boot scenario (which I have been successfully on a number of machines for a number of years). I have Windows 7 (32 bit) on one partition and Windows 7 (64 bit) on another and a common data partition (which happens to store the user hives for each OS instance). For some reason, on one particular machine (a HP Pavilion notebook) the restore points get trashed after a reboot. I can create them (both manually and automatically), but after some (but not all) reboots the restore points get trashed. I have all three partitions set (on both OSs) to hold restore information. This setup has worked successfully on other machines for at least 12 months. I'm out of ideas... I DO need the restore points as I do "bleeding edge" stuff and they've saved my bacon on other machines in the past... TIA, Paolo

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• Freelance for moderately complex admin support

  - by ongraphs

  Mailing lists and question/answers works great for problems that are independently encountered by several people. But sometimes we (as in experienced amateurs) run into problems that aren't so common, nobody has blogged about it and experts advice not readily available. For IT-admin related stuff can someone please recommend how can amateurs pay experts and get hands on advice. The kinds of problems I am talking about are like setting up nxserver or openvpn on freeBSD box. The install/config is not so simple, the documentation not easy for non-it professionals. Therefore getting step by step advice would be quite helpful. Thanks sandeep

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• can I make Excel always open a delimited text file with "text" translation?

  - by khedron

  Hi there, Opening a tab-delimited data file in Excel to view & manipulate the data is a very common operation around here. However, by default Excel (2003/4 or 2007/8) will read the columns in a "General" format, which occasionally does terrible things like turning "1/2" into "2-Jan". Is there a way to tell Excel never to do this, but always process the values as Text, without going through the format wizard, selecting all of the columns, and doing it manually? Extra points if this works in both Mac and Windows versions of Excel.

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• Restoring the Fonts folder by using a restore point

  - by ryalho

  I am an idiot. Who would have thought that installing 2 gigs of fonts would be detrimental to the boot up time for the most common design programs such as adobe illustrator. I would like to restore the font folder because I am no longer able to just delete the fonts. It takes too long. So when I right-click the fonts folder and select "Restore Previous Versions" I am able to find a restore point, but the "Restore" button is greyed out. this leads me to think that I cannot change the settings of files in the windows directory. Oh and there are 34,000 fonts I need gone. Thanks

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• Top causes of slow ssh logins

  - by Peter Lyons

  I'd love for one of you smart and helpful folks to post a list of common causes of delays during an ssh login. Specifically, there are 2 spots where I see a range from instantaneous to multi-second delays. Between issuing the ssh command and getting a login prompt and between entering the passphrase and having the shell load Now, specifically I'm looking at ssh details only here. Obviously network latency, speed of the hardware and OSes involved, complex login scripts, etc can cause delays. For context I ssh to a vast multitude of linux distributions and some Solaris hosts using mostly Ubuntu, CentOS, and MacOS X as my client systems. Almost all of the time, the ssh server configuration is unchanged from the OS's default settings. What ssh server configurations should I be interested in? Are there OS/kernel parameters that can be tuned? Login shell tricks? Etc?

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• Can't rename folders in Window 7/32bit after anti-virus change

  - by Tasos

  I recently started having the common, as I realized, problem of not being able to rename folders in Windows 7 (32 bit). I don't understand why it happened after almost a year of ideal use of Windows 7. I haven't removed the libraries nor can I think of anything else that could potentially cause this, at least as far as I know. The only thing I did recently was to change my anti-virus program from the freeware version of Avira to the freeware anti-virus Microsoft Security Essentials. Any idea on what the problem is and how to fix this?

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• Accessing ActiveX control through web server

  - by user847455

  I have developed the ActiveX control & register with Common CLSID number . using the CLSID number accessing the active X control on the internet explorer (as web page).using following object tag used in .html file OBJECT id="GlobasysActiveX" width="1000" height="480" runat="server" classid="CLSID:E86A9038-368D-4e8f-B389-FDEF38935B2F" i want to access this web page through web server .I have place this web page into the vitual directory & access using localhost\my.html it's working. but when i have accessed from LAN computer it will not access the activeX control from my computer . how to embed or download the activeX control form my computer into the LAN computer through web server thanks in advance

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• Application or plugin for turning screenshots into searchable text?

  - by Software dood

  It's a common practice in our company that people take screenshots of any software error situation they get into, and then they paste the screenshots in mail messages and/or Word documents that get sent and forwarded back and forth. I have lots of stuff like this in my Outlook mail archives, and the problem with it is, the screenshots aren't searchable, because they're just dumb images as far as Outlook or Windows Search are concerned. Sometimes I edit the original mail messages and type the text (typically an error message) from the screenshot into the message, but quite rarely, because it's slow and prone to typing errors. Is there a program or Outlook or Windows plugin that would OCR and index images in the Outlook mail archives, so the image contents would become indexable?

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• Windows hiding other user's files?

  - by JoshJordan

  I had a hard drive whose windows installation (running Vista) became corrupt. I bought a new hard drive, installed Windows 7, and hooked up the old drive using an external enclosure. The Users folder on the old drive shows the users that existed on the machine, but it doesn't show any of the contents of them. I assume this is due to not having the permissions I need. I have "taken control" of the folders I'm interested in, but this didn't prompt me for the original owner's password as I expected, and I still can't see the file contents. I would guess that this is a fairly common issue, but I'm not sure what to Google here. How can I get access to files in that drive's User directory?

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• Why does yum index get corrupted?

  - by TomOnTime

  Occasionally yum's cache gets corrupted and we see errors like this: error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db3 - (-30974) error: cannot open Packages database in /var/lib/rpm The workaround is rm -f /var/lib/rpm/__db* and then the next "yum" command regenerates the data. My question is: what is likely to be causing this? Is there some common task that ignores locks or has other problem that causes this? We have hundreds of CentOS machines and there is no pattern to which see this problem. It could be a "one in a million" issue, which at large scale is seen often. NOTE: I realize this is a very "open ended" question, but if an answer finds the cause, I will go back and turn the question into something more canonical that directly relates to the specific issue.

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• Ways to deduplicate files

  - by User1

  I want to simply backup and archive the files on several machines. Unfortunately, the files have some large files that are the same file but stored differently on different machines. For instance, there may a few hundred photos that were copied from one computer to the other as an ad-hoc backup. Now that I want to make a common repository of files, I don't want several copies of the same photo. If I copy all of these files to a single directory, is there a tool that can go thru and recognize duplicate files and give me a list or even delete one of the duplicates?

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• Disable CTRL + ALT + [LETTER] to produce accented variations

  - by Barney

  After an unknown config change, CTRL + ALT + [LETTER] has started producing common accented versions of [LETTER]. I'm not a big fan of this arrangement, seeing as I've memorized all my favourite ALT + [NUMPAD SEQUENCE] references and was used to using CTRL + ALT + [LETTER] for various other application-specific commands in my text editor. The prominent result from my searching suggests that this has something to do with a switch to an 'international keyboard', and says this can be removed in the control panel or toggled by hitting ALT + SHIFT, but I can't get my system to confirm this, and the solutions (or close approximations thereof) don't work. Specifically, I've been to Control Panel\Clock, Language, and Region\Language\Advanced settings and switched the override for default input method from 'language list' to English and I've been to Control Panel\Clock, Language, and Region\Language\Language options and made sure that I only have my one input method (UK). Other than that I'm not quite sure where to look. Any ideas?

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