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• Ubuntu server failing daily

  - by deanvz

  Symptoms: Server becomes unresponsive - Increase in load, all services stop Loss of connectivity - Ping/SSH Flush MySQL hosts after reboot - As MySQL refuses new connections Intermittent Apache crashes Generally happens early morning hours - 2 days of the week are however excluded Changes made: Updated the OS - to Ubuntu 10.04.4 LTS Not sure if the MySQL server was also updated in the process Current MySQL version - mysql Ver 14.14 Distrib 5.1.63, for debian-linux-gnu (x86_64) using readline 6.1 Updated Plesk from 10.4.4 Update #47 to 11.0.9 Update #23 Rebooted on almost daily basis All crons stopped for the times corresponding to the server crashes Created a MySQL log to monitor the lock times on queries Possible causes: Failing hardware Incorrect software configuration (MySQL, Apache etc) Responsibilities: Small webserver Runs our billing system - WHMCS Responsible for CRONs Bulk-email solution - No delivery times coincide with server crashes Proposed solutions: Move machine over to VM Format and restore the Plesk server backup and take it from there? Side notes: Seems to be a general Apache failure across all our linux servers - Intermittent problem Are we doing something fundamentally wrong in the Apache config? (I understand that this is a secondary question, just making sure that it isnt possibly holding any relevance)

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• How does copy protection work?

  - by Yar

  Many programs refuse to go beyond a trial period. Even if they are trashed and then reinstalled, they 'remember' that the trial period has expired. Assuming no contact with a licensing server, what is the general way that most copy protection works? Do programs drop files in random folders on the hard disk that are hard to track down? I know there's no registry on OSX/Linux, but perhaps something similar... ? Or must it be a file/folder? I'm actually not curious from a hacking side but rather from the implementation side, but in any case the question is basically the same.

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• unknown codec 0x0064 (G726 ADPCM)

  - by Colin Pickard

  I've got a number of audio recordings which I can't play back. It appears to be a case of a missing codec, but I can't locate the codec in question. VLC will not play the files. ffmpeg gives the error Unsupported codec (id=0) for input stream 0. This is the output from MediaInfo. General CompleteName : Format : Wave FileSize/String : 164 KiB Duration/String : 1mn 24s OverallBitRate/String : 16.0 Kbps Audio Format : ADPCM CodecID : 64 CodecID/Info : G.726 CodecID/Hint : APICOM Duration/String : 1mn 24s BitRate_Mode/String : Constant BitRate/String : 16.0 Kbps Channel(s)/String : 1 channel SamplingRate/String : 8 000 Hz BitDepth/String : 2 bits StreamSize/String : 164 KiB (100%) Can anyone help?

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• Bash: Reset and Clear Commands

  - by sixtyfootersdude

  I have been using the command: reset to clear my terminal. Although I am pretty sure this is not what I should be doing. Reset, as the name suggests resets your entire terminal (changes lots of stuff). Here is what I want: I basically want to use the command clear. However if you clear and then scowl up you still get tones of stuff from before. In general this is not a problem however I am looking at gross logs that are long and I want to make sure that I am just viewing the most recent one. I know that I could use more or something like that but I prefer this approach.

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• kernel software trap handling

  - by Tony

  I'm reading a book on Windows Internals and there's something I don't understand: "The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread invokes kernel functions related to the software interrupt." So does this mean that software interrupts or exceptions will only be handled under these conditions: a. When the kernel is executing a function from said thread related to the software exception(trap) b. when it is already handling a hardware trap Is my understanding of this correct? The next bit: "In most cases, the kernel installs front-end trap handling functions that perform general trap handling tasks before and after transferring control to other functions that field the trap." I don't quite understand what it means by 'front-end trap handling functions' and 'field the trap'? Can anyone help me?

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• Practical RAID Performance?

  - by wag2639

  I've always thought the following to be a general rule of thumb for RAID: RAID 0: Best performance for READ and WRITE from stripping, greatest risk RAID 1: Redundant, decent for READ (I believe it can read from different parts of a file from different hard drives), not the best for WRITE RAID 0+1 (01): combines redundancy of RAID 1 with performance of RAID 0 RAID 1+0 (10): slightly better version of RAID 0+1 RAID 5: good READ performance, bad WRITE performance, redundant IS THIS ASSUMPTION CORRECT? (and how do they compare to a JBOD setup for R/W IO performance) Are certain practical RAID setups better for different applications: gaming, video editing, database (Acccess or SQL)? I was thinking about hard disk drives but does this apply to solid state drives as well?

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• Using awstats with a round-robin DNS configuration

  - by Shaun

  I have a website with multiple web servers whose access is controlled via a round-robin DNS. We currently use Google Analytics for site traffic monitoring but were looking to move to awstats due to concerns of inaccuracy with Google Analytics and using third-party trackers in general. I have a little experience with awstats and I know it gets its information from parsing server logs. How would this work when you have multiple web servers logging independently to separate locations? Is this supported with awstats? Is there an alternative I could use to track traffic activity directly on my servers?

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• How can I delete virtual networks from command line?

  - by David Cobb

  I have Hyper-V Server 2008 R2 (without GUI) running at my colo for a week. I was connected via RDP and could use the menu interface and command line. I figured out how to connect Hyper-V Manager from my Win7 laptop (THANK YOU HVREMOTE!), and created and installed my VM. I created a virtual network that didn't work (no connectivity from my VM) so I created another using different settings, and now have lost access to the Hyper-V host. No ping, no RDP. Since I don't have console access, I cannot troubleshoot. I believe if I deleted the Virtual Networks I'd regain access, but I need a command line instruction for this, that the staff onsite could enter to accomplish this. I find no help anywhere obvious (MSDN, etc), the keywords are too general. Can anyone refer me to simple steps how to do this over command line or with the menu based interface on the console?

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• How to disable Apache http compression (mod_deflate) when SSL stream is compressed

  - by Mohammad Ali

  I found that Goggle Chrome supports ssl compression and Firefox should support it soon. I'm trying to configure Apache to to disable http compression if the ssl compression is used to prevent CPU overhead with the configuration option: SetEnvIf SSL_COMPRESS_METHOD DEFLATE no-gzip While the custom log (using %{SSL_COMPRESS_METHOD}x) shows that the ssl layer compression method is DEFLATE, the above option did not work and the http response content is still being compressed by Apache. I had to use the option: BrowserMatchNoCase ".Chrome." no-gzip' I prefer if there are more general method in case other browsers supports ssl compression or some has a version of chrome that does not have ssl compression.

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• No compatible network card

  - by sbintcliffe

  Motherboard: Asus K8N-E Deluxe with onboard NIC (nVidia nForce) Secondary NIC: I've tried using a standard NIC (Device Manager displays this as D-Link DFE-538TX 10/100, but under manufacturer in the General tab of the properties in Windows it states Realtek Semiconductor Corp.) I have downloaded ESXi 4.0.0 build 208167 and cooked to disc. I've booted from it, the .TGZ modules load from the yellow and grey screen, the progress bar reaches to about 60% and like a second later the screen changes and I have the following information on screen; "No compatible network adapter found. Please consult the HCG." I've checked the HCG and found that my motherboard is listed. I also get the same message with the secondary NIC. Any ideas please?

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• "svn: Cannot negotiate authentication mechanism" for OSX CLI and WinXp TortoiseSVN, but linux CLI works

  - by dacracot

  I had a working subversion server which used the passwd file which stores passwords in clear text. My requirements changed so that passwords now need to be encrypted. I did everything according to the book to use SASL, or so I believe, but now only the linux command line can authenticate. My OSX users, which also use command line, and my WinXp users, which use TortoiseSVN get errors. Linux versions are 1.6.11. OSX versions are 1.6.17. And TortoiseSVN versions are 1.7.4. /opt/subversion/QRpage/conf/svnserve.conf: [general] anon-access = none auth-access = write realm = ABC [sasl] use-sasl = true min-encryption = 128 max-encryption = 256 /etc/sasl2/svn.conf: pwcheck_method: auxprop auxprop_plugin: sasldb sasldb_path: /etc/sasldb2 mech_list: DIGEST-MD5 Then I add new users via: saslpasswd2 -c -f /etc/sasldb2 -u ABC dacracot But for instance OSX users get this error trying to check out: $ svn co svn://svn.nowhere.org/QRpage svn: Cannot negotiate authentication mechanism

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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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• Windows 7 Natively on Mac OS X Bootcamp, Airport Wifi Unable To Connect....

  - by Goober

  Hello! I am using a brand new MacBook Pro. I am running a copy of Windows 7 natively via bootcamp (No use of Virtual Machine Software at all). However the only way I can get Windows to connect to the internet is via ethernet, as opposed to the Macs Airport card picking up the wireless. It just refuses to connect, and gives me a limited access status. Any ideas!? I've run Windows XP natively via bootcamp and I had a few issues with the network constantly dropping out, however I blamed that on the drivers and the general shiteness of XP.... Help greatly appreciated.

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• Swithing from Windows to Mac OSX - Application recommendations

  - by roosteronacid

  My new Macbook Pro 13" notebook should arrive this monday. And I can't wait! I am a long (looong) time Windows user. And after a good week of researching, I am still somewhat in the dark as far as which applications are "must-haves" on Mac OSX. I would be very greatful if you guys would recommend your favorite applications. I'm looking for recommendations in the following categories... General use applications: File-compression applications, peer-to-peer applications, CD/DVD ripping/burning applications, messaging applications, etc. Web-development applications: Code editors, graphic design applications, and everything in between Must-have-cannot-live-without applications: Things like Growl and other applications that live within Mac OSX's preference panel Virtiualization applications: VMware Fusion, Parallels, etc.

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• How to use register with CTRL-A or CTRL-X in vim

  - by Luc M

  Suppose that I have a number into register r. How could I use this value with CTRLA and CTRLX Here's an example to make it clearer: Suppose that I have this text file: 10 13 15 I want to to increase those numbers with the value in register r to obtain (if it contains 5) 15 18 20 Why I'm asking it ? Because I want to use CTRLA into a macro but the number of time that I need to apply CTRLA is only know at "run time". In a more general way, how could I execute a command a number of times stored in a register ? All of these questions and answers where interesting but they don't answer my question: http://stackoverflow.com/questions/1497958/how-to-use-vim-registers http://stackoverflow.com/questions/2405952/vim-register-use-in-ex-mode

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• test of ICMP block

  - by Marcos

  In my bash scripts I have been using something like: until fping -u google.com; do echo "$0[$$] Network/DNS down?? $(date)" 1>&2 && sleep $(($RANDOM%(1 + ++trynum * 1) +1)).222; done to test for online connectivity. It halts in place, sleeping growing random intervals, until it can ping google.com again. Problem: At some sites ICMP pings are blocked altogether, and web pages are still reachable. What's a short way to test for this general case? Based on that test I will switch over to an http-based test like the exit status of curl -s google.com >/dev/null if that is a good one.

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• Invalid domains in DNS don't work on mac/*nix like systems

  - by David Mulder

  At work we use domains like abc-01, which work fine on windows. Whilst developing mobile applications we already saw that this doesn't work on both iOS and android which we fixed for a few specific domains (by setting the dns up that abc-01.def.local also works in those) and was assumed to be caused by it being an invalid domain. Now however it's necessary to connect through VPN from a mac and changing all relevant domains is not an option at the moment (far too many of them and would require changing the settings of far too many applications), so I was hoping whether somebody knows a trick or setting to get this to work on mac (or even linux in general).

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• QR Codes for Files on Google Code

  - by Synetech inc.

  Hi, When you download files from Google Code now (example), in addition to the text version of the SHA1 hash, it includes a QR code of it. The device that the file was downloaded to is the one that has to hash the file. But, if it can download the file (ie, has access to the webpage), it also has access to the text version of the hash, so the QR code seems completely useless—and more work to decode when the raw text is available. How would reading the hash into a mobile phone allow you to verify the file you download to the computer? Or if you download the file to the phone, how would you use the phone to take a picture of the QR code displayed on the webpage on its own screen? Does anyone know what the point to the QR code is or how you would use it to verify the downloaded file (I don’t mean QR codes in general, but specifically in this context).

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• Where to set Visual studio 2013 property macros

  - by marcp

  I'm a new VS user. I've received some sample C++ projects working with a 3rd party API. They were saved in VS2012 format, but I have VS 2013. After conversion I find that there is an API specific macro defined in the project properties in the "Linker|General|Additional Library Directories" category. If I click on 'edit' I can replace the macro with an actual path, but how do I establish what the macro points to? In other words, how does one create a macro usable in multiple projects?

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• Which FLOSS text editor is most like kwrite without being KDE-based?

  - by darenw

  Among text editors on Linux, I usually prefer KWrite. I like that I can quickly turn on/off line numbers and line wrap in the View menu. Other settings are easy to change. Other text editors I've used in the past, such as Gnome's gedit, bury line numbering and wrapping checkboxes deeper into the menu system, making it more distracting to change while concentrating on real work. However, KWrite is a KDE app. On Ubuntu it drags in over a dozen other packages, which I suspect I don't really need. Why would a text editor need all that? It's slower to start up than some other editors I've tried. I'm also trying to run an all-gnome system w/o any KDE, just to see how far I get with it. So, what GUI text editor isn't KDE-based, has few dependencies and quick start-up, easy to change line wrap and numbering, and general similarity to KWrite? What comes closest?

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• tag based file organizer

  - by Richie

  I'm finishing professional school and over the years have acquired a pile of notes and articles that I'd like to hang onto. I'd like to add to them and create sort of an archive of article and files that may be useful down the road. I'd also like to organize this collection of files not only by simple grouping but also with tags. I feel like that will make searching through them years later much easier. Suggestions on software that would be good for this? Just a general file manager, something that uses tags that can be attached to each file? Thanks

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• Does Windows Virtual PC support virtual applications with an XP Home Edition guest?

  - by endolith

  I've installed Windows Virtual PC in Windows 7 and have the XP Mode virtual PC working. I can run virtual applications with it and the integration features all work. I used Disk2VHD to convert my existing XP Home drive into a VHD, so I can use it as a virtual PC, too. It works in general, but it sometimes pops up the "Could not enable integration features" error. I don't see the host computer's drives in the guest, and I don't see the guest's applications in the host's Start menu. Is this just because the guest is XP Home instead of XP Pro? Do I have to reinstall all these apps in the XP Mode VHD in order to get them as virtual apps? Could something else be preventing it from working?

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• How can I selectively increase latency? E.g. throttle games

  - by Arcymag

  Basically, I want networked games to run poorly on a network, but I want everything else to run smoothly. I would also appreciate advice on blocking games in general. As far as I can tell, there's a few ways to completely prevent an internet game from running: Blocking entirely via DNS configuration (e.g. hosts file), or router DNS configuration Blocking entirely via a separate DNS server Blocking the application, by uninstalling or some kind of access control Blocking the application by automatically killing the process every once in a while Blocking the application by corrupting files periodically However, I would like a more subtle way to block a program. Something that either: Increases latency (would this be doable through some kind of QoS like what DD-WRT offers?) Increases latency by using a special routing configuration for specific target IPs Throttle other systems resources, such as memory, IO, or CPU Screw around with keyboard configurations when a game is launched I would like this to work on MacOSX and Windows, but Linux would be great too. FYI I don't have a kid, but I was brainstorming with some friends and parents.

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• Two internet connections coming in, one Sonicwall Tz170 (enhanced os), and slow speed

  - by Development 4.0

  I work a lot from my home office and being in general a tad paranoid I have cable and DSL pipes coming into my house. I have used an Ebay bought Sonicwall Tz170 with the enhanced OS for a good while. I believe it does failover and has a feature for doing round robin on which connection is used. I get the impression from using it that I might not be getting the most out of this setup. Is it possible/likely that my router could be a cause of the slowdown? Are there more appropriate choices?

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• Skipping scheduled self-tests and predicting drive EOL

  - by Steve Madsen

  For a few weeks now, smartd has been reporting that it is skipping some of its scheduled self-tests on the weekends: Apr 24 18:29:32 calvin smartd[4758]: Device: /dev/sda, skip scheduled Offline Immediate Test; 40% remaining of current Self-Test. Apr 24 18:29:33 calvin smartd[4758]: Device: /dev/sdb, skip scheduled Offline Immediate Test; 50% remaining of current Self-Test. The drives in this RAID-1 array are set to run an offline test four times a day, a short self-test at 2am every day, and a long self-test on Saturdays at 2am. For some reason, it looks like the long self-test is taking longer, causing the other scheduled tests to be skipped. First question: is this a sign of likely drive failure? Then today, smartd reported that a self-test failed. Here is the output of smartctl -a /dev/sdb: smartctl version 5.38 [i686-pc-linux-gnu] Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Model Family: Seagate Barracuda 7200.8 family Device Model: ST3250823AS Serial Number: 3ND1GNBC Firmware Version: 3.03 User Capacity: 250,059,350,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 7 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Sun Apr 25 13:15:34 2010 EDT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 430) seconds. Offline data collection capabilities: (0x5b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 1) minutes. Extended self-test routine recommended polling time: ( 84) minutes. SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 047 039 006 Pre-fail Always - 168450357 3 Spin_Up_Time 0x0003 098 098 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 33 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 9 7 Seek_Error_Rate 0x000f 087 060 030 Pre-fail Always - 654745480 9 Power_On_Hours 0x0032 055 055 000 Old_age Always - 40141 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 51 194 Temperature_Celsius 0x0022 037 062 000 Old_age Always - 37 (0 17 0 0) 195 Hardware_ECC_Recovered 0x001a 047 039 000 Old_age Always - 168450357 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0000 100 253 000 Old_age Offline - 0 202 TA_Increase_Count 0x0032 100 253 000 Old_age Always - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Short offline Completed without error 00% 40131 - # 2 Extended offline Completed: read failure 30% 40129 379795511 # 3 Short offline Completed without error 00% 40084 - # 4 Short offline Completed without error 00% 40060 - # 5 Short offline Completed without error 00% 40036 - # 6 Short offline Completed without error 00% 40013 - # 7 Short offline Completed without error 00% 39990 - # 8 Extended offline Completed without error 00% 39977 - # 9 Short offline Completed without error 00% 39919 - #10 Short offline Completed without error 00% 39895 - #11 Short offline Completed without error 00% 39872 - #12 Short offline Completed without error 00% 39848 - #13 Short offline Completed without error 00% 39824 - #14 Short offline Completed without error 00% 39801 - #15 Extended offline Completed without error 00% 39789 - #16 Short offline Completed without error 00% 39754 - #17 Short offline Completed without error 00% 39732 - #18 Short offline Completed without error 00% 39707 - #19 Short offline Completed without error 00% 39683 - #20 Short offline Completed without error 00% 39660 - #21 Short offline Completed without error 00% 39636 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. Given that this drive is about 4.5 years old, I am probably tempting fate by keeping it in service. SMART doesn't seem to get much respect as a reliable way to predict drive failure. What else can I use to get an early indication of drive failure?

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