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  • Ubuntu 12.04 crash analysis - strange binary data on all open files at the moment of crash

    - by lanbo
    A couple of hours ago we got a system crash on Ubuntu 12.04. We checked all the log files and there is nothing suspicious to blame to. Last stuff that was logged was some dovecot activity. There are no kernel panic messages. Nothing. It is a new server (new hardware) we are testing before production. And because it is new hard, I'm suspicious the problem may be due to some faulty hardware. We already run memtester with no problem detected. I'll be happy to hear from other hardware testing tools (the machine has SSD). Anyway, the thing I wanted to ask you is a different one. The strange thing is on every open file at the moment of the crash we found the next sequence of symbols was written into them: "@^@^@^@^@^@^@...". For example, on the syslog log file we got: Apr 16 15:53:56 odyssey dovecot: pop3-login: Aborted login (auth failed, 1 attempts): user=<info>, method=PLAIN, rip=46.29.255.73, lip=5.9.58.177 ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^ [these continues for about 1000 chars...] ^@^@^@^@Apr 16 15:55:12 odyssey kernel: imklog 5.8.6, log source = /proc/kmsg started. We got all these symbols in all open files. These include: syslog, mail.log, kern.log, ... But also on some logs that are output by php scripts run in CRONs from user accounts (not root). So, any idea why all open files got these characters written during the crash? This is pretty bad since the crash corrupted many files (we don't even know which other ones may be affected). We are suspicious that all open files (in write mode maybe) at the moment of the crash got all these symbols inserted. Why is that? BTW [in case it helps], the system automatically rebooted after the crash but Apache did not start. There were not traces in /var/apache2/*log why apache did not start. After running a "service apache2 start" it started with no problems. Also, we rebooted the machine manually and Apache also started on reboot. But it did not start after the crash and no errors were reported. Thanks guys!

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  • Limiting Failed SSH Logins

    - by nitins
    I would like to limit failure retries on my Fedora machine to 5. I think I can accomplish it with PAM. But was unable to to do this. I have referred to this article to do this http://www.puschitz.com/SecuringLinux.shtml Please provide suggestions

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  • Should I switch to Linux for development?

    - by Alex
    Is there any advantage to use a Linux machine to develop instead of Windows? Everyone at work tells me to switch to Linux, since I'm developing hard-core on linux anyway. I manage 40 servers, and do everything from DB to data-backend to developing web services. I don't find anything wrong with Putty. I"m just too lazy to install another OS... What do you guys think?

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  • Very slow printing from print server

    - by evolvd
    Print server is a VM on Xen The VM is Windows 2003 32bit. During the issue the VM is not being taxed in anyway, cpu, memory, hd read/write, and network speed is all good. The problem that I see is the transfer of the print file from the print server to the printer. The 80Mb file is transferred from the client to the print server in about 2 minutes but then it takes about 2 hours for that file to be sent to the printer. I can't figure out why this would just start to happen. The printer is rebooted every evening and is just used for one large print job in the morning. The server has been rebooted with no effect I changed the spool option to send the entire spool to the server before printing starts and it had no effect. This printer problem did happen to come about after some changes to the Xen environment. The Xen servers changed from using HBA NIC cards to software iscsi and a new switch was put in. I don't think this is related to the problem since all the speeds on the VMs are better now. The changed happened on Saturday and the first print to this printer happened on Monday morning. I'm just putting that out there but like I said I don't think it is related but I don't want to rule it out. At this point I don't have many other options besides the physical layer. I can switch out network cable that goes to the printer and I might be able to print the same job to another printer. I wont be able to test those things out till this afternoon though. Any other ideas or test I could do to try to find the reason for the slow speed? I forgot to say that this is only happening when printing to this one printer. ===Update=== I found out that there are a few printers that currently have this issue, not just the one. There are over 30 printers on the server though so I know it's not happening to all of them. I printed a large pdf doc from the server and it was able to print at the normal speed. If the machine sends the large print request it gets to the server fine but then slow to get from the server to the printer. If sent directly from the printer it gets to the printer at the normal speed. The question now is why is there a speed difference when it comes from the machine and why would it start now?

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  • "Safely Remove Hardware" icon keeps reverting to "Only show notifications"

    - by Dan Parsonson
    I have the 'Safely Remove Hardware' tray icon set to 'Show icon and notifications' to save a mouse click when removing a USB device but every few weeks the setting reverts to 'Only show notifications'. Does anyone know what causes this and/or how I can prevent it? I'm using Windows 7 SP1 64bit with a fairly bare installation (the machine hosts a set of virtual machines that I use to do my work). Thanks!

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  • Using dynamic dns updater as Windows service

    - by Sami-L
    Currently I am using a dynamic dns updater software on Windows, but to keep it updating I have not to close it, also the software is not able to run at backgoud, I searched on google but the answer became complicated since there are many details to pay attention to, free, not free, installed on machine, configured on router, trusted, not trusted ... So please help me find a trusted free dns updater for Windows which can run as service, and maybe which can send email when update fails.

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  • CUPS in linux and printer

    - by yogesh
    How can I achieve the following behavior? CUPS Server communicate with hardware printer by using the "PostScript3" language and the LPD/LPR protocol to manage and transmit printing jobs. CUPS server must be configured to accept following file formats: PS, TXT, PDF, JPEG and PNG. This means only these files get printed and others should be blocked. I want to connect actual hardware printer using IPP from the linux machine.

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  • Has anyone achieved true differential sync with rsync in ESXi?

    - by Julius
    Berate me later on the fact that I'm using the service console to do anything in ESXi... I've got a working rsync binary (v3.0.4) that I can use in ESXi 4.1U1. I tend to use rsync over cp when copying VM's or backups from one local datastore to another local datastore. I've used rsync to copy data from one ESXi box to another but that was just for small files. In now trying to do true differential syncs of backups taken via ghettoVCB between my primary ESXi machine and a secondary one. But even when I do this locally (one datastore to another datastore on the same ESXi machine) rsync appears to copy the files in their entirety. I've got two VMDK's totally 80GB in size, and rsync still takes anywhere between 1 and 2 hours but the VMDK's aren't growing that much daily. Below is the rsync command I'm executing. I am copying locally because ultimately these files will get copied onto a datastore created from a LUN on a remote system. Its not an rsync that'll be serviced by an rsync daemon on a remote system. rsync -avPSI VMBACKUP_2011-06-10_02-27-56/* VMBACKUP_2011-06-01_06-37-11/ --stats --itemize-changes --existing --modify-window=2 --no-whole-file sending incremental file list >f..t...... VM-flat.vmdk 42949672960 100% 15.06MB/s 0:45:20 (xfer#1, to-check=5/6) >f..t...... VM.vmdk 556 100% 4.24kB/s 0:00:00 (xfer#2, to-check=4/6) >f..t...... VM.vmx 3327 100% 25.19kB/s 0:00:00 (xfer#3, to-check=3/6) >f..t...... VM_1-flat.vmdk 42949672960 100% 12.19MB/s 0:56:01 (xfer#4, to-check=2/6) >f..t...... VM_1.vmdk 558 100% 2.51kB/s 0:00:00 (xfer#5, to-check=1/6) >f..t...... STATUS.ok 30 100% 0.02kB/s 0:00:01 (xfer#6, to-check=0/6) Number of files: 6 Number of files transferred: 6 Total file size: 85899350391 bytes Total transferred file size: 85899350391 bytes Literal data: 2429682778 bytes Matched data: 83469667613 bytes File list size: 129 File list generation time: 0.001 seconds File list transfer time: 0.000 seconds Total bytes sent: 2432530094 Total bytes received: 5243054 sent 2432530094 bytes received 5243054 bytes 295648.92 bytes/sec total size is 85899350391 speedup is 35.24 Is this because ESXi is itself making so many changes to the VMDK's that as far as rsync is concerned the entire file has to be retransmitted? Has anyone actually achieved actual diff sync with ESXi?

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  • Apache/2.2.20 (Ubuntu 11.10) gzip compression won't work on php pages, content is chunked

    - by FamousInteractive
    I'm running into a problem with a new production server whereto I'm transferring projects. The HTML output of the PHP applications isn't compressed by the Apache mod_deflate module. Other resources, as stylesheet and javascript files, even html pages, which are served with the same Content-type (text/html) as the PHP output, are compressed! The projects use the following rules (from HTML5 boilerplate) in the .htaccess: <IfModule mod_deflate.c> # Force deflate for mangled headers developer.yahoo.com/blogs/ydn/posts/2010/12/pushing-beyond-gzipping/ <IfModule mod_setenvif.c> <IfModule mod_headers.c> SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding </IfModule> </IfModule> # HTML, TXT, CSS, JavaScript, JSON, XML, HTC: <IfModule filter_module> FilterDeclare COMPRESS FilterProvider COMPRESS DEFLATE resp=Content-Type $text/html FilterProvider COMPRESS DEFLATE resp=Content-Type $text/css FilterProvider COMPRESS DEFLATE resp=Content-Type $text/plain FilterProvider COMPRESS DEFLATE resp=Content-Type $text/xml FilterProvider COMPRESS DEFLATE resp=Content-Type $text/x-component FilterProvider COMPRESS DEFLATE resp=Content-Type $application/javascript FilterProvider COMPRESS DEFLATE resp=Content-Type $application/json FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xhtml+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/rss+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/atom+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/vnd.ms-fontobject FilterProvider COMPRESS DEFLATE resp=Content-Type $image/svg+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $image/x-icon FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-ttf FilterProvider COMPRESS DEFLATE resp=Content-Type $font/opentype FilterChain COMPRESS FilterProtocol COMPRESS DEFLATE change=yes;byteranges=no </IfModule> </IfModule> We have a testing machine that runs the same Apache, OS and PHP version. On that machine the compression works just fine on the PHP output. I've checked and compared Apache and PHP config files, all the same as far as I can tell. I've tried several manners of outputting the content of the PHP, using output buffering or just plain echoing the content. Same thing, no compression. Example response headers of a PHP output: HTTP/1.1 200 OK Date: Wed, 25 Apr 2012 23:30:59 GMT Server: Apache Accept-Ranges: bytes Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: public Pragma: no-cache Vary: User-Agent Keep-Alive: timeout=5, max=98 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8 Example of response headers on a css file: HTTP/1.1 200 OK Date: Wed, 25 Apr 2012 23:30:59 GMT Server: Apache Last-Modified: Mon, 04 Jul 2011 19:12:36 GMT Vary: Accept-Encoding,User-Agent Content-Encoding: gzip Cache-Control: public Expires: Fri, 25 May 2012 23:30:59 GMT Content-Length: 714 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/css; charset=utf-8 Does anyone has a clue or experienced the same "problem"? thanks!

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  • How to specify this 'symbolic link' for the Jungo WinDriver?

    - by user252098
    Just now , I try to install the Jungo WinDriver in the Ubuntu 13.10 . But I am puzzled by the its manual : 4.2.3. Linux WinDriver Installation Instructions 4.2.3.1. Preparing the System for Installation In Linux, kernel modules must be compiled with the same header files that the kernel itself was compiled with. Since WinDriver installs kernel modules, it must compile with the header files of the Linux kernel during the installation process. Therefore, before you install WinDriver for Linux, verify that the Linux source code and the file version.h are installed on your machine: Install the Linux kernel source code: If you have yet to install Linux, install it, including the kernel source code, by following the instructions for your Linux distribution. If Linux is already installed on your machine, check whether the Linux source code was installed. You can do this by looking for 'linux' in the /usr/src directory. If the source code is not installed, either install it, or reinstall Linux with the source code, by following the instructions for your Linux distribution. Install version.h: The file version.h is created when you first compile the Linux kernel source code. Some distributions provide a compiled kernel without the file version.h. Look under /usr/src/linux/include/linux to see whether you have this file. If you do not, follow these steps: Become super user: $ su Change directory to the Linux source directory: cd /usr/src/linux Type: make xconfig Save the configuration by choosing Save and Exit. Type: make dep Exit super user mode: exit To run GUI WinDriver applications (e.g., DriverWizard [5]; Debug Monitor [7.2]) you must also have version 5.0 of the libstdc++ library — libstdc++.so.5. If you do not have this file, install it from the relevant RPM in your Linux distribution (e.g., compat-libstdc++). Before proceeding with the installation, you must also make sure that you have a linux symbolic link. If you do not, create one by typing /usr/src$ ln -s 'target kernel'/linux For example, for the Linux 2.4 kernel type /usr/src$ ln -s linux-2.4/ linux ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I can't understand how to specify these two parameters in my Ubuntu .

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  • Intranet Ip - Access from Custom Domain

    - by Alexander Wigmore
    I have setup a local intranet in my office using IIS7 (Windows 7 Machine), currently it can be accessed through the PC's static IP, however I would like it so that internally it can just be accessed through an easier method, e.g typing in http://intranet (or something similar). There are over 60 PC's int he office, so individually updating Host files on the PC's is not really ideal. We don't need it to be accessible from the outside world (I.e, we don't care/want it to be an Extranet). Any tips?

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  • Screen Recording Utility

    - by abc
    Hello, I want a screen recording(video) utility desired features are : it should be free (higher in priority) it should be available for win,linux,and mac(mac in lower priority,linux or win will work) It should have mic input facility to record external sound as well as machine's sound. It should have highlighting functionality(lower in priority) at last cracked versions are also welcomed. Thanks.

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  • How to spy on a Mac from a PC

    - by Phenom
    I have a desktop running Windows 7 and a Macbook Pro running Snow Leopard. If someone is using my Macbook Pro, and from my Windows 7 machine I want to see what they see on their screen, is there a way to do that?

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  • Using AutoHotKey to change audio output source?

    - by Scott
    I have two primary audio outputs on my machine: The speakers and a USB headset. Currently, in Windows 7 Professional x64, I type "sound" in the Start search menu to open up this dialog: I only care about the top two options for the purposes of this question. I would like to know if there's a way in AutoHotKey to switch from "Speakers (4- Sennheiser USB Headset)" to "Speakers (VIA High Definition Audio)" so I can avoid having to open this dialog every time I wish to switch. Thanks!

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  • mod_rewrite rules in httpd configuration

    - by wag2639
    How and where do I put my mod_rewrite rules in the httpd configuration so that they're only parsed once at startup instead of each time a file in my web directory is read. Additional info: assuming all scripts work in .htaccess file RHEL4 running Apache 2.0.52 multiple sub/domains on the the machine Thanks

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  • ssh sessions in xterms freeze for many minutes whenever they disconnect

    - by dreeves
    If I ssh to a remote machine and then lose internet connectivity, the session freezes. I can't control-c or otherwise abort and go back to my local xterm or terminal prompt but if I wait several minutes it will do so. There must be some way to force it to abort the remote ssh session when connectivity is lost. I'm on a Mac but I believe this happens on cygwin or linux as well.

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  • Taskbar on secondary monitor in XP?

    - by Hemal Pandya
    I am looking for a free virtual-desktop program that will allow me to put a different virtual desktop on each of my two monitors (one on laptop and the other external) How I would like to use it: I do a lot of work connecting to other servers using remote desktop. I would like to use the external monitor to open remote desktop in full screen and use the laptop monitor for the local machine to view my mails, chat, browser, etc. I am using XP SP3.

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  • How to setup Mercurial on Mac OS X 10.5.8 for remote access

    - by Abhic
    Hello I have a stable hackintosh box running 10.5.8 at home with py 2.5.1 and mercurial 1.5.2 setup successfully. Now I do not have any ports opened from this box and the associated router nor do I have any web servers running on this system. What are the steps that I have to take to setup this machine to be a remotely available as a mercurial repository? Thank you folks.

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  • unix script problem

    - by Darie Nicolae
    Hello everyone, I have a simple script which runs on a FreeBSD machine with the following code: #!/bin/sh `sed -i .bak '\:#start 172.0.0.3:,\:#end 172.0.0.3:d' /usr/local/etc/racoon/racoon.conf` echo $? It should delete a block of text between the two patterns. The problem is that if I run the sed command directly from shell it works, if i run the script the return code is 0. Why's that?

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  • windows server 2003 cannot accept connections

    - by Seb
    Hi everyone, I am running a Windows Server 2003 OS and am noticing that no one is able to connect to the machine through Remote Desktop. I have gone through the Terminal Services Configuration to make sure that we had the RDP-Tcp connection enabled and I've checked to see that the server was listening to port 3389. Are there any other options since I've tried to ping into our host server with no results. Thanks in advance.

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