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• Get details / solve issue with a kernel panic?

  - by Joseph

  I have a Lenovo T430 running Linux Mint 13 (MATE): joseph:~$ uname -a Linux joseph-T430-LM 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux I installed Mint immediately after getting the laptop about two weeks ago, and have noticed that about once a day, the computer will completely freeze up- I can't use Ctrl+Alt+Backspace to restart X, I can't use Ctrl+Alt+F1 to get a text only terminal, can't move mouse, can't type, and if any music was playing it just gets stuck in about a 1-second loop. There is a Windows partition, but I haven't had any issues in Windows. I couldn't find a common thread between the freezes, they were seemingly random (sometimes right after I clicked the mouse, sometimes not; sometimes with Pandora/flash being used, sometimes not, etc). I assume they're kernel panics since it completely locks up, but the laptop doesn't have a capslock or scroll lock LED. It is on a dock and I do have a USB keyboard, but the scroll lock/capslock lights do not flash when it happens (not sure if this is indicating its not a kernel panic, or if the kernel panic just wouldn't illuminate the LEDs on a usb keyboard attached to a laptop dock). This was annoying but not terrible. However, I've found a way to reproduce it. I have a particular CSV file that when I open up in LibreOffice Calc and scroll around, the same thing happens- complete lock up. I really need to use this file, so I'd like to fix the issue, but at the least it's given me a test case to work with. So, having a case where I can cause this issue, what can I do to better find out what's going on? I've looked in /var/log/syslog but haven't found anything seemingly useful. Any thoughts?

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• Apache+PHP on Windows Server 2008

  - by Álvaro G. Vicario

  I've installed Apache/2.2 and PHP/5.3 lots of times under Windows XP, Windows Vista and Windows Server 2003. The official *.msi installers work fine and configure everything. Now I need to install them into a Windows Server 2008 R2 Standard 64-bit box and I'm facing nothing but problems: There are no official 64 bit binaries for Apache and no binaries at all for PHP (official or third-party). It's alright, I'll do with good 32 bits, but it's kind of surprising. Official documentation is vague, generic and completely unaware of UAC or any recent Windows security feature. The PHP installer is unable to configure mod_php and the Apache installer is unable to configure... well, Apache. After three hours I've finally reached the point where I'm installing everything in the root folder and assigning full control access to all users in all files and directories and all I've got is a PHP-less Apache server that's able to serve static pages. So I guess it's time to stop and think. My question is: Has anyone installed an Apache+PHP production server under Windows Server 2008 in a serious, secure and reliable way and documented the whole process? Or should I just find a bundle like XAMPP and the like that requires no installation? === EDIT === I've installed Xampp Lite 1.7.3 and everything was working in 5 minutes. I'd still like to find some documentation about installing the original packages: XAMPP installs tons of stuff I don't need and offers no tool to enable and disable PHP extensions.

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• "Options ExecCGI is off in this directory" When try to run Ruby code using mod_ruby

  - by Itay Moav

  I am on Ubuntu, Apache 2.2 Installed the fcgi via apt-get then removed it via apt-get remove. Installed mod-ruby configuration I added to Apache: LoadModule ruby_module /usr/lib/apache2/modules/mod_ruby.so RubyRequire apache/ruby-run <Directory /var/www> Options +ExecCGI </Directory> <Files *.rb> SetHandler ruby-object RubyHandler Apache::RubyRun.instance </Files> <Files *.rbx> SetHandler ruby-object RubyHandler Apache::RubyRun.instance </Files> I have a file in the www direcoty with puts 'baba' I have other files in that directory, all accessible via Apache. Test file has been chmod 777 In the browser I get 403. In Apache error log I get: [error] access to /var/www/t.rb failed for (null), reason: Options ExecCGI is off in this directory If I move this to a sub folder rubytest and modify the relevant config to be: <Directory /var/www/rubytest> Options +ExecCGI </Directory> and making sure the directory has 755 permissions on it, it just try to download the file, as if it does not recognize the postfix *.rb any more If I give directory and files 777 it fails: usr/lib/ruby/1.8/apache/ruby-run.rb:53: warning: Insecure world writable dir /var/www/rubytest in LOAD_PATH, mode 040777 [Tue May 24 19:39:58 2011] [error] mod_ruby: error in ruby [Tue May 24 19:39:58 2011] [error] mod_ruby: /usr/lib/ruby/1.8/apache/ruby-run.rb:53:in load': loading from unsafe file /var/www/rubytest/t.rb (SecurityError) [Tue May 24 19:39:58 2011] [error] mod_ruby: from /usr/lib/ruby/1.8/apache/ruby-run.rb:53:in handler' BUT, IF I USE *.rbx it works like a charm...go figure.

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• Distribute IP packets accross different NIC queues with MSI (Message Signalled Interrupts)

  - by Ansis Atteka

  NetXtreme II BCM5709 Gigabit Ethernet NIC supports MSI feature (Message Signaled Interrupts) and it has 8 queues. Each queue has its own Interrupt handler in /proc/interrupts. What I am trying to accomplish is to tell NIC which packets should go to which queue. Questions: Is it possible to manually specify which IP packets should go to which queue by encapsulated protocol type (e.g. IPsec packets go in one queue, while TCP packets go in another queue)? If it is possible - how can I do it under Linux? If it is not possible - should I look at MSI-X capable NIC cards to solve this problem? More details: We have one Interface that is terminating IPSec and forwarding/terminating TCP connections. The IPSec packet decryption is inlined (this means that decryption is done under the same ksoftirqd/X context). We are trying to find out if we will be able to improve total performance if IPSec packets will be scheduled on another CPU than TCP packets. One more limitation is that IPSec code is not MP-safe, hence I can not run it under more than one ksoftirqd/X. By default it seems that packets are distributed/hashed by source IP over the 8 NIC queues. The bottleneck is IPSec that chokes out TCP traffic while it is decrypting/encrypting IPSec packets at ~100% CPU. OS is Ubuntu 10.10 (2.6.32-27-server) and NIC is Broadcom BCM5709.

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• IIS 7.5 / Windows 7: Error 500.19, error code 0x800700b7

  - by nikhiljoshi

  I have been trying to resolve this issue. I am using Windows 7 and VS2008 +iis7.5. My project is stuck because of this error. The error says: Error Summary HTTP Error 500.19 - Internal Server Error The requested page cannot be accessed because the related configuration data for the page is invalid. `Detailed Error Information Module IIS Web Core Notification BeginRequest Handler Not yet determined Error Code 0x800700b7 Config Error There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined Config File \\?\C:\inetpub\wwwroot\test23\web.config Requested URL http://localhost:80/test23 Physical Path C:\inetpub\wwwroot\test23 Logon Method Not yet determined Logon User Not yet determined Config Source 15: <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> 16: <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication"/> 17: <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> ` I followed the instructions in this Microsoft solution document, but it didn't help. http://support.microsoft.com/kb/942055

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• Favorite tricks with linux kernel boot parameters?

  - by ~drpaulbrewer

  Most linux bootloaders let you edit the kernel boot command line before booting. There are often lots of parameters available -- Knoppix, for instance, has a list on their Knoppix Cheat Codes page -- but most are applicable only to compatibility and special situations. A few are hidden gems. Common usages of these codes are to boot to single-user mode, alter screen mode or drivers, or to specify an alternative root directory. Other more exotic uses are possible. Some linux distributions let you copy the boot cd into ram. Others (e.g., Ubuntu) let you use preseed files to clone installs when setting up multiple systems -- useful when installing a lab full of computers without having to baby sit each install. What other tricks have you found useful in system installs, repairs, backups, restores, establishing temporary servers, or other tasks? To add your favorite trick to the list: As much of the code for these options goes on either in initrd, or in a service handler that detects the kernel parameters, please list *(1) the kernel boot line parameter, (2) what it does, (3) the linux distribution and any required packages to activate the feature*. Thanks.

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• nf_conntrack complaints in dmesg

  - by Alexander Gladysh

  While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server: [11458852.811070] net_ratelimit: 321 callbacks suppressed [11458852.811075] nf_conntrack: table full, dropping packet. [11458852.819957] nf_conntrack: table full, dropping packet. [11458852.821083] nf_conntrack: table full, dropping packet. [11458852.822195] nf_conntrack: table full, dropping packet. [11458852.824987] nf_conntrack: table full, dropping packet. [11458852.825298] nf_conntrack: table full, dropping packet. [11458852.825891] nf_conntrack: table full, dropping packet. [11458852.826225] nf_conntrack: table full, dropping packet. [11458852.826234] nf_conntrack: table full, dropping packet. [11458852.826814] nf_conntrack: table full, dropping packet. Complains are repeated every five seconds (number of suppressed callbacks is different each time). What can these sympthoms mean? Is that bad? Any hints? (Note that the question is more narrow than "how to solve specific case of bad HTTP server performance", so I do not give more details on that.) Additional info: $ uname -a Linux MYHOST 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04 LTS Release: 12.04 Codename: precise $ cat /proc/sys/net/netfilter/nf_conntrack_max 1548576 The server is under about 10M hits / day load.

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• What benchmark tool to use to benchmark hardware for VM server?

  - by Mark0978

  We are setting up a new piece of hardware to virtualize several of our servers on. Choices are RAID 5, RAID 6, and RAID 0+1. We are wanting to benchmark all three before we go live with the machine, but I'm not sure how to test the speed. Since we will be using it to host VMs, what will the actual disk traffic look like? What can I use to see if RAID 6 is too slow? Short of setting up the system with all the VM's on it and running that way, then redoing on all the work, I'm not sure how to test it. It them becomes more of a subjective test than an objective one. I'm worried that RAID6 will have too much overhead, that RAID5 will be to fragile with 3TB drives and I've never worked with 0+1 at all. So in short I'd like to setup the base machine (which will be running Linux) and then test the underlying SW RAID for speed. What kind of tool exists to simulate this kind of load? Barring the lack of a specific tool, how about a generic FS testing tool that will simulate different loads?

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• what is uninstall procedure for software installed via "make install" on CentOS 6.2

  - by gkdsp

  I installed OCILIB on my CentOS 6.2 server some time ago, and now I want to install a newer version. The vendor requires an uninstall, but doesn't provide instructions. I'm guessing that's because it's trivial for people with a Linux background. http://orclib.sourceforge.net/doc/html/group_g_install.html If I installed this software using: step 1: # ./configure --with-oracle-headers-path=/usr/include/oracle/11.2/client64 --with-oracle-lib-path=/usr/lib/oracle/11.2/client64/lib step 2: # make step 3: # su root step 4: # make install step 5: # gcc -g -DOCI_IMPORT_LINKAGE -DOCI_CHARSET_ANSI -L/usr/lib/oracle/11.2/client64/lib -lclntsh -L/usr/local/lib -locilib conn.c -o conn How would I go about uninstalling this? I tried following this http://www.cyberciti.biz/faq/delete-uninstall-software-linux-commands/ but nothing was found on my disk using rpm -qa *oci* or yum list *oci*. Maybe since it wasn't installed with yum or rpm then I shouldn't expect either of these to find it. Are there generic instructions for uninstalling software on Linux that I could use, or do the instructions really depend on the specific software? Any help much appreciated.

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• Google Chrome doesn't respond user actions correctly

  - by Carlos A. Junior

  Recently I've changed my OS to Ubuntu 12.04 (Cinnamon, 64 bits) from Mint 13 (KDE, 64 bits) and one same bug still appears on new installation. The Google Chrome it seems that don't refresh (repaint) page based on my interactions. Example: When i'm try comment an Youtube vídeo, when i click on textarea, o cursor don't appear inside of textarea, BUT, when/if i change to another tab and return the cursor appears...OK... If i start write some text...according i'm typing the chars don't appers...again if i change to another tab and return the typed text appears on textarea. Other cases that this bug appears: Modal boxes link...don't show the modal; Forms inside modal boxes don't show typed chars; The common Discus comment plugin don't work when focused; I don't have any idea of reason of this bug. (video driver, window manager, Chrome bug ?, i don't know) Any idea to solve this ? Additional informations: Google Chrome 22.0.1229.79 (Official Build 158531) OS Linux WebKit 537.4 (@129177) JavaScript V8 3.12.19.11 Flash 11.3.31.331 User Agent Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.79 Safari/537.4 Command Line /opt/google/chrome/google-chrome --flag-switches-begin --flag-switches-end Executable Path /opt/google/chrome/google-chrome Profile Path /home/carlos/.config/google-chrome/Default Kernel version: 3.2.0-31-generic-pae Ubuntu 12.04 Best regards.

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• Installing Mysql Ruby gem on 64-bit CentOS

  - by Jacek

  Hi, I have a problem installing mysql ruby gem on 64bit CentOS machine. [jacekb@vitaidealn ~]$ uname -a Linux vitaidealn.local 2.6.18-92.el5 #1 SMP Tue Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux Mysql and mysql-devel packages are installed. Mysql_config provides following paths: Usage: /usr/lib64/mysql/mysql_config [OPTIONS] Options: --cflags [-I/usr/include/mysql -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fwrapv] --include [-I/usr/include/mysql] --libs [-L/usr/lib64/mysql -lmysqlclient -lz -lcrypt -lnsl -lm -L/usr/lib64 -lssl -lcrypto] --libs_r [-L/usr/lib64/mysql -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -L/usr/lib64 -lssl -lcrypto] --socket [/var/lib/mysql/mysql.sock] --port [3306] --version [5.0.45] --libmysqld-libs [-L/usr/lib64/mysql -lmysqld -lz -lpthread -lcrypt -lnsl -lm -lpthread -lrt -L/usr/lib64 -lssl -lcrypto] Trying to install: [jacekb@vitaidealn ~]$ gem install mysql -- --with-mysql-include=/usr/include/mysql --with-mysql-libs=/usr/lib64/mysql ... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /usr/bin/ruby extconf.rb --with-mysql-include=/usr/include/mysql --with-mysql-libs=/usr/lib64/mysql checking for mysql_query() in -lmysqlclient... no checking for main() in -lm... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lz... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lsocket... no checking for mysql_query() in -lmysqlclient... no checking for main() in -lnsl... no checking for mysql_query() in -lmysqlclient... no *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. I would appreciate any help. Thanks for reading :).

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• UPS with a HP Proliant server

  - by Groo

  We placed a EATON Ellipse Max 1500 (900W) as the UPS for our HP Proliant ML350 G6. Upon first power failure (actually we only moved the UPS' input plug to a different socket), server immediatelly turned off, and the Health LED turned red and started blinking. UPS was in operation for about a week before that, with battery fully charged to 100%. Since our server's hot-plug supply is 460W, we are pretty sure we haven't overloaded it, the server was completely idle at that time (no web or win apps running except Windows Server core services). Then we tried to do the same with a different, no-name older PC (Core 2 Duo, 2Gb RAM) with a generic power supply (not sure what the power is) and it continued working when we pulled the plug out. UPS load was less than 15% (measured in the provided Eaton utility). We measured the UPS' output voltage using a smart oscilloscope and the THD of the UPS output waveform turned out to be 40%. Did you have similar experiences? Could this be a faulty UPS? Or a faulty power supply? Or some HP sensors configured to trigger too strictly? I wouldn't like replacing this UPS with the same brand, to get same results. [Edit] I also tried to do this while the server is turned off. While the UPS is working on battery, server will not start - as soon as I press the power button, Health LED starts blinking red.

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• help with xorg.conf: xrandr on one of two widescreen monitors; rhel5, kde, ATI Radeon X1300

  - by user35997

  Can anyone help with me configure my dual-screen monitors for rotation? I have xrandr 1.1. Have tried various approaches, nothing takes. I can't even get the xrandr options to show up in KDE's Display control panel. Thanks1 My lspci output: 03:00.0 VGA compatible controller: ATI Technologies Inc RV516 [Radeon X1300/X1550 Series] My current xorg.conf (works, minus screen rotation): # Xorg configuration created by system-config-display Section "ServerLayout" Identifier "Multihead layout" Screen 0 "aticonfig-Screen[0]" 0 0 InputDevice "Keyboard0" "CoreKeyboard" Option "Xinerama" "off" Option "Clone" "on" EndSection Section "Files" EndSection Section "Module" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection Section "Monitor" ### Comment all HorizSync and VertSync values to use DDC: Identifier "Monitor1" VendorName "Monitor Vendor" ModelName "Dell 2407WFP (Digital)" HorizSync 30.0 - 83.0 VertRefresh 56.0 - 76.0 Option "dpms" EndSection Section "Monitor" Identifier "aticonfig-Monitor[0]" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Device" Identifier "Videocard0" Driver "vesa" EndSection Section "Device" Identifier "Videocard1" Driver "vesa" VendorName "Videocard Vendor" BoardName "ATI Technologies Inc RV516 [Radeon X1300/X1550 Series]" BusID "PCI:3:0:0" EndSection Section "Device" Identifier "aticonfig-Device[0]" Driver "fglrx" Option "DesktopSetup" "horizontal" EndSection Section "Screen" Identifier "Screen0" Device "Videocard0" DefaultDepth 16 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Videocard1" Monitor "Monitor1" DefaultDepth 16 SubSection "Display" Viewport 0 0 Depth 16 Modes "1920x1200" "1280x1024" "800x600" EndSubSection EndSection Section "Screen" Identifier "aticonfig-Screen[0]" Device "aticonfig-Device[0]" Monitor "aticonfig-Monitor[0]" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1920x1200" "1280x1024" "800x600" EndSubSection EndSection

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• DHCP Server on local machine

  - by EralpB

  Hello I am trying to setup a dhcp3-server on Ubuntu. But my question is more generic, if dhcp server is in a blockbox and all clients are connected to it I think I get what is going on but when dhcp server is installed on one of the "clients" that confuses me. When I send a dhcp packet from that client to the dhcp server, will my ethernet card read and write at the same time? Or will it handle it internally without writing any data to ethernet cable. It's the first time I am encountering these network things so I am a little bit confused. Also I wonder If I am in a big network with lan IP let's say 192.168.0.100 and I install a dhcp server to my computer, can any other computers accidentally get IP from my dhcp server? Every computer has one ethernet card (if that matters?). And every computer is connected to one router. I guess the answer is no because the broadcast message won't reach to my computer since when router receives a dhcp search packet it will answer and it won't let other computers know about it because they don't need to. And without router sending that packet one by one, it cannot travel further. I'd be glad if someone enlightens me. Thank you very much.

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• Apache 2 proxy for Tomcat 7

  - by hsnm

  Following the how-to, I wanted to make a proxy for traffic to the address /app to be processed by Tomcat 7. I added this to my httpd.conf: LoadModule proxy_module {path-to-modules}/mod_proxy.so LoadModule deflate_module modules/mod_deflate.so ProxyPass /app http://localhost:8081 ProxyPassReverse /app http://localhost:8081 I also have this on my server.xml: <Connector port="8081" enableLookups="false" acceptCount="100" connectionTimeout="20000" proxyName="localhost" proxyPort="80"/> And I have the folder /var/lib/tomcat7/webapps/app with my application files. I restarted both Tomcat 7 and Apache 2 after doing the configurations above. Problem: When navigating to my webpage.com/app, I get the error 500. I consulted apache logs, it says: [warn] proxy: No protocol handler was valid for the URL /app. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule. Update: This is running in ubuntu. I resolved this by adding LoadModule proxy_http_module modules/mod_proxy_http.so to my httpd.conf. Now I have another question: How can I make this proxy to work on SSL through port 443?

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• running red5 on port 80

  - by ArneLovius

  I have a red5 application http://code.google.com/p/openmeetings that runs under red5, and is accessible on port 5080 and 8443 I've installed it on Ubuntu 10.04 The eventual aim is to have it accessible via https on 443 instead of 8443, but I thought I would initially try on 80 so that any issues were just down to the port configuration and not SSL certificates. I've tried changing the port from 5080 to 80 in the red5.properties file, but it fails to start. In the red5.log I have seen ERROR o.a.coyote.http11.Http11Protocol - Error initializing endpoint java.net.BindException: Permission denied /0.0.0.0:80 In the error.log I have seen ERROR o.a.coyote.http11.Http11Protocol - Error initializing endpoint java.net.BindException: Permission denied /0.0.0.0:80 and ERROR org.red5.server.tomcat.TomcatLoader - Error loading tomcat, unable to bind connector. You may not have permission to use the selected port org.apache.catalina.LifecycleException: Protocol handler initialization failed: java.net.BindException: Permission denied /0.0.0.0:80 There is nothing else installed or running on port 80, so I presume that this is a "needs to be root" situation. I would rather not run an Internet accessible web service as root. I know that Tomcat can run on port 80 by changing “#AUTHBIND=no” to “AUTHBIND=yes” in /etc/default/tomcat6 but I have not been able to find anything similar for red5. Am I on a hiding to nothing, or is there better way than running as root ? Thanks!

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• Fetch videos from sony handycam to linux

  - by bstpierre

  I've got a Sony Handycam DCR-DVD101. When I plug connect the USB cable to my laptop (Ubuntu 10) it doesn't mount any storage device. If I run usb-devices, I see: T: Bus=02 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#= 6 Spd=480 MxCh= 0 D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 P: Vendor=054c ProdID=00c1 Rev=01.00 S: Manufacturer=SONY S: Product=Storage Device C: #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=2mA I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=05 Prot=50 Driver=usb-storage The driver says usb-storage, but I'm not sure how to get the device mounted. Is there a way to make this work? Update: checking dmesg, I see: [259072.576559] usb 2-1.1: new high speed USB device using ehci_hcd and address 6 [259072.687200] usb 2-1.1: configuration #1 chosen from 1 choice [259072.836188] Initializing USB Mass Storage driver... [259072.836476] scsi5 : SCSI emulation for USB Mass Storage devices [259072.836632] usb-storage: device found at 6 [259072.836636] usb-storage: waiting for device to settle before scanning [259072.836660] usbcore: registered new interface driver usb-storage [259072.836666] USB Mass Storage support registered. [259077.830410] usb-storage: device scan complete [259077.832343] scsi 5:0:0:0: CD-ROM SONY DDX-A1010 R1.0 PQ: 0 ANSI: 0 [259077.888167] sr1: scsi3-mmc drive: 0x/0x pop-up [259077.888446] sr 5:0:0:0: Attached scsi CD-ROM sr1 [259077.888593] sr 5:0:0:0: Attached scsi generic sg2 type 5 [259080.002079] sr 5:0:0:0: [sr1] Unhandled sense code [259080.002085] sr 5:0:0:0: [sr1] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE [259080.002091] sr 5:0:0:0: [sr1] Sense Key : Blank Check [current] [259080.002097] sr 5:0:0:0: [sr1] Add. Sense: No additional sense information [259080.002104] sr 5:0:0:0: [sr1] CDB: Read(10): 28 00 00 00 00 00 00 00 02 00 00 00 [259080.002117] end_request: I/O error, dev sr1, sector 0 [259080.002123] Buffer I/O error on device sr1, logical block 0 [259080.002128] Buffer I/O error on device sr1, logical block 1 Those I/O errors don't look good, is there any hope?

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• ext4 filesystem corruption -- maybe hardware error?

  - by pts

  I'm getting these errors in dmesg after about half an hour after I turn on the computer: [ 1355.677957] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318420: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251700offset=0(0), inode=1802725748, rec_len=179136, name_len=32 [ 1355.677973] Aborting journal on device sda2-8. [ 1355.678101] EXT4-fs (sda2): Remounting filesystem read-only [ 1355.690144] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1318416: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251699offset=0(0), inode=2194783952, rec_len=53280, name_len=152 [ 1356.864720] EXT4-fs error (device sda2): htree_dirblock_to_tree: inode #1312795: (comm updatedb.mlocat) bad entry in directory: directory entry across blocks - block=5251176offset=1460(13748), inode=1432317541, rec_len=208208, name_len=119 /dev/sda is an SSD, and it's using the noop scheduler. /etc/fstab entry: UUID=acb4eefa-48ff-4ee1-bb5f-2dccce7d011f / ext4 errors=remount-ro,noatime,discard,user_xattr 0 1 System information: $ cat /proc/mounts | grep /dev/sd /dev/sda1 /boot ext2 rw,noatime,errors=continue 0 0 $ cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.04 DISTRIB_CODENAME=lucid DISTRIB_DESCRIPTION="Ubuntu 10.04.3 LTS" $ uname -a Linux leetpad 2.6.35-30-generic-pae #61~lucid1-Ubuntu SMP Thu Oct 13 21:14:29 UTC 2011 i686 GNU/Linux I've run memtest for 7 hours, it didn't found any memory errors. Any obvious ideas what can go wrong in this case? The most reasonable thing I can imagine is that the SSD is silently dropping some write requests, which eventually leads to an EXT4 filesystem inconsistency (but no disk I/O errors). How can this happen? Is there a relevant configuration option I should ensure to be set correctly? What tools should I use to diagnose the hardware failures? Would it be possible to diagnose the SSD failure without overwriting data?

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• PHP/MySQL Performance Testing with Just PHP

  - by Mike Gifford

  I'm trying to diagnose a server where the website is loading very slowly, but unfortunately my client has only provided me with FTP access. I've got FTP access so I can upload PHP scripts, but can't set up any other server side tools. I have access to phpMyAdmin, but not direct access to the MySQL server. It is also unfortunately a Windows server (and we've been a Linux shop for over a decade now). So, if I wan to evaluate MySQL & disk speed performance through PHP on a generic server, what is the best way to do this? There are already tools like: https://github.com/raphaelm/php-benchmark or https://github.com/InfinitySoft/php-benchmark But I'm surprised there isn't something that someone has already set up & configured to just run through and do some basic testing of a server's responsiveness. Every time we evaluate a new server environment it's handy to be able to compare it to an existing one quickly to see if there are any anomalies. I guess I'd just hoped that someone else had written up a script to do this already. I know I have, but that was before Github when there was a handy place to post scraps of code like this. Originally posted in http://stackoverflow.com/questions/12321498/php-mysql-performance-testing-with-just-php but it was recommended that I re-post it here.

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• Mystery Print Separator Page

  - by Jesse Bradlee

  Good morning! After a recent site upgrade to WebSphere 7.0 from 6.1 on an AIX server, our users reported a print separator page appearing on a certain type of report, and only on one printer. Trouble is, no one (devs, sysadmins, users) knows where it came from or where to turn it off. Based on the info, the first step was to check the app, but we don't have print separators in our code. The report they're using also lacks even an option to separate. Then I asked the WebSphere gurus but they shook their heads. Ditto the network/print server team. If anyone can identify the source of this separator, I can take that back to the relevant team and have it switched off. They look like this (some whitespace removed for brevity): *################################################## *################################################## *################################################## *************************************************** TITLE: [document name] TIME PRINTED: Fri Sep 20 08:21:45 2013 TIME QUEUED: Fri Sep 20 08:21:45 2013 PRINTED AT: hp@hp41 (generic) @ [app name] SUBMITTED BY: root DELIVER TO: =====> root <===== *************************************************** FLAG VALUES: a-0, b=0, d=a, f=, g=1, h=, i=0, j=+, l=00, p=10, t=0, v=6, w=3--, x=2, A=1, B=gn, C=!, H=, J=+, L=+, N=1, P=[printer name]:hp@hp41, X=ISO8859-1, Z=+, 0=ibm.850 *************************************************** Thank you!

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• windows cant "see" camera

  - by user330401

  So I bought a lil emerson camera and I am trying to get it to read the thing on windows 7. The instructions for the camer say when you first hook it up via usb AUTOPLAY will come up and your good to go. Well that worked for me the first time I hooked it up. However the 2nd time, it started trying to install drivers. Since then I can't get it to show up in windows explorer. I have tried disabling and uninstalling everything and trying to start from scratch but its useless, I'm stuck with having to pull the sd card everytime. I really dont like doing this as its a cheap camera, so if I can fix the communication between the devices via usb I would be really happy. As of right now the device installation shows a checked USB COMPOSITE DEVICE and 3 X'd GENERIC IMAGE DEVIC. Can someone please help me get this sorted. PS there are no drivers for this camera, not in the packaging, not available from emerson, and to be honest it shouldn't need any. The only function the camera has when hooked up via USB is charging and access to the DCIM. The charging still works, but the drive just won't load. Any suggestions?

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• netsnmp - how to register string?

  - by user1495181

  I use net-snmp. I try to add my own mibs (no need in handler, just a MIB that i can get and set by snmp call), so i followed the scalar example. In order to add my own mibs i defined them in the mib file and create an agent extension.(see below). It work, so i have now an integer MIB. Now i want to add string mib, so i define the MIB , but i dont find a register API for string, like i have for the int - netsnmp_register_int_instance. I look in the includes file , but dosnt found matching one. agent: #include <net-snmp/net-snmp-config.h> #include <net-snmp/net-snmp-includes.h> #include <net-snmp/agent/net-snmp-agent-includes.h> #include "monitor.h" static int int_init = 0; /* default value */ void init_monitor(void) { oid open_connections_count_oid[] = { 1, 3, 6, 1, 4, 1, 8075, 1, 0 }; netsnmp_register_int_instance("open_connections_count", open_connections_count_oid, OID_LENGTH(open_connections_count_oid), &int_init, NULL); }

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• Duplicity on a ReadyNAS

  - by Jason Swett

  Has anyone here run Duplicity on a ReadyNAS? I'm trying but here's what I get: duplicity full --encrypt-key="ABC123" /home/jason/ scp://[email protected]//gob Invalid SSH password Running 'sftp -oServerAliveInterval=15 -oServerAliveCountMax=2 [email protected]' failed (attempt #1) I've also found this post that says the "Invalid SSH password" message doesn't actually mean invalid SSH password. This would make sense because I'm not using an SSH password; I'm using a public key. I can ssh, ftp, sftp and rsync into my ReadyNAS just fine. (Actually, to be more accurate, I can get past authentication with ssh, ftp and sftp but I can't actually do anything past that. Regardless, that's enough to tell me that "Invalid SSH password" is bogus. Rsync works with no problems.) The post I found says the command will work as soon as the directory at the end of your scp command exists, but I don't know how to check for that. I know the share gob exists on my ReadyNAS and I know it's writable because I'm writing to it with rsync. Also, here is the verbose output: Using archive dir: /home/jason/.cache/duplicity/3bdd353b29468311ffa8485160da6873 Using backup name: 3bdd353b29468311ffa8485160da6873 Import of duplicity.backends.rsyncbackend Succeeded Import of duplicity.backends.sshbackend Succeeded Import of duplicity.backends.localbackend Succeeded Import of duplicity.backends.botobackend Succeeded Import of duplicity.backends.cloudfilesbackend Succeeded Import of duplicity.backends.giobackend Succeeded Import of duplicity.backends.hsibackend Succeeded Import of duplicity.backends.imapbackend Succeeded Import of duplicity.backends.ftpbackend Succeeded Import of duplicity.backends.webdavbackend Succeeded Import of duplicity.backends.tahoebackend Succeeded Main action: full ================================================================================ duplicity 0.6.10 (September 19, 2010) Args: /usr/bin/duplicity full --encrypt-key=ABC123 -v9 /home/jason/ scp://[email protected]//gob Linux gob 2.6.35-22-generic #33-Ubuntu SMP Sun Sep 19 20:34:50 UTC 2010 i686 /usr/bin/python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39) [GCC 4.4.5] ================================================================================ Using temporary directory /tmp/duplicity-cridGi-tempdir Registering (mkstemp) temporary file /tmp/duplicity-cridGi-tempdir/mkstemp-ztuF5P-1 Temp has 86334349312 available, backup will use approx 34078720. Running 'sftp -oServerAliveInterval=15 -oServerAliveCountMax=2 [email protected]' (attempt #1) State = sftp, Before = '[email protected]'s' State = sftp, Before = '' Invalid SSH password Running 'sftp -oServerAliveInterval=15 -oServerAliveCountMax=2 [email protected]' failed (attempt #1) Any ideas as to what's going wrong?

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• Dell XPS m1530 system cannot boot need 130w or greater

  - by KPS

  I have a Dell XPS M1530 and I lost my old AC adapter but ordered a new one. For the longest time it always had a battery charge so I was able to boot into the OS but now it is completely dead. I have a generic charger that slowly charged the laptop when it was in the OS but does not when the computer is off. When I boot up I get the following error: The AC power adapter type cannot be determined. The system can only boot with a 130 W power adapter or greater. Strike F1 key to shutdown. I cannot even enter the BIOs setup screen or boot menu, is there a way around this? I heard from the local tech that Dell has a special feature to boot from thumb drive before getting past the initial logo. I am doing my best to avoid purchasing a new charger since it worked just fine when the OS was running, I am hoping to get this thing going. Is there a way to charge the battery externally? Thanks in advance for any help!

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• Keyboards for kiosk/outdoor/abusive environments?

  - by Justin Scott

  We have a bunch of kiosks deployed into let's just say... abusive environments. The enclosures we had built are touch as nails, and the HP thin client computers are working great. The keyboards that were purchased for the project have been nothing but problems. They're a generic brand direct from a Chinese manufacturer. They're stainless steel with keys mounted from the inside and a trackball, but they've been deployed for only a month and nearly 20% of them are already out of service due to keys sticking, keys not working, trackball problems, water damage, and a variety of other issues. Are there any kiosk keyboards that can take a beating without breaking so easily? Ideally they should be tamper-proof (keys can't be removed), waterproof, lettering should be engraved into the keys, trackball, option for a single mouse button would be nice, and some protection to keep debris out of the keys so they don't stick (sticky cleaners, food debris, etc.). Does such a beast exist? Everything we've looked at is susceptible to easy damage. We need the M1 Abrams Tank of keyboards. Any suggestions?

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