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• Linux group permissions getting overwritten by owner

  - by Andy

  I am not a user of Linux, but I am encountering some permissions problems with it that I hope someone can shed some light on. Bit of background: A colleague of mine has a Linux box (running Debian I believe) with an SVN repository on it. The repository directory and files 'owner' is my colleauge. We are both members of a group called 'users'. He manages several projects both Linux and Windows apps, while I have one Windows app. For the Windows apps, we both use TortoiseSVN via an SSH link to commit/update. Performing the command 'ls -l' shows the repository files and folders on the Linux box to have the following permissions: -rwxrwx--- john users However, when my colleauge commits to the repository, the permissions change to: -rwxrwx--- john john This then means I get 'Permission denied' when trying to access the repository myself as it appears that the group permissions have been overwritten with only 'owner' permissions. To fix this, a 'chown -R' command is applied to the files/folders to set the permissions back to owner/group, but each time he writes to the repository, the issue repeats. I'm not sure if this is solely an SVN problem, or a more fundamental owner/group issue. Anyone any clue on how to stop this happening, or where to go and look? I'm trying to help out my colleague who is having some trouble resolving this issue. Apologies for the vague info, I hope I have conveyed the problem clear enough. Like I say, I am not a Linux user, I have only put down what I have managed to pick up from looking over his shoulder. Thanks for any pointers I can pass on!

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• How to generate thumbnails for less common video containers (mkv, ogm, mp4, flv, rmvb and mov) in wi

  - by fluxtendu

  So how to generate thumbnails for these containers? I know that the install of "DivX Plus Tech Preview: MKV on Windows 7" does it for MKV. But I think that only some registry changes are really necessary and I want it for other containers. If it's possible to avoiding the install of (always bloated) codecs packs it would be nice... Maybe only installing ffdshow or essential and separated codecs. (some time ago I have try reg files for vista without success...) Update: I have installed Win7codecs & tweaked a little its settings and I got almost everything I want. (I have also re-installed the relevant part of the divx plus tech preview to get something else than an all black preview for MKV) Issues that I still want to resolve: Find a cleaner & lighter method Almost all my rmvb and mov files got an all black preview (installing real media/quick time alternative doesn't help, is it the same with the officials?) With almost all containers (avi, mkv, ogm, mpg), I have (few) random files that don't get the preview. I could play them in WMP or another player and don't have found a pattern in the codecs used. All wmv, flv and mp4 have previews but I have less files in these containers. (I clear my thumbnails cache to test them) More generally I would like to understand how windows handle the containers & codecs to generate the previews. And a software that let me choose arbitrarily the pictures previewed would be convenient too

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• Linux Mint reset display resolution from console

  - by wullxz

  I have a Linux Mint 13 Xfce in a VMware Workstation 8 VM and set the resolution from 800x600 to 1280x768 and now I get permanently logged out when I try to login. I knew how to get back to my old resolution back in the xorg.conf days but Linux Mint now uses xrandr which won't display any displays when running # xrandr because X is not running (of course not - I can't login over GUI). I know that there are configuration files in /etc/X11/Xsession.d/ because I configured a debian based thinclient's resolution in a file called /etc/X11/Xsession.d/91configure_display but that file doesn't exist in my Linux Mint VM. So, how do I reset my X screen resolution from console? Edit: I forgot to tell you that I can't change resolution in console: # xrandr -s 800x600 Can't open display This message appears every time I use xrandr or xrandr -s *resolution* Update: I tried what bWowk suggested: # export DISPLAY=:0.0 # xrandr -s 800x600 No protocol specified No protocol specified Can't open display :0.0 So, that doesn't work either. Isn't there a configuration file that is executed every time X starts? X is running btw - ps aux | grep X shows one process /usr/bin/X running.

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• Ubuntu 10.04 Keyboard and Mouse Freezing Problem

  - by nitbuntu

  I had a partition setup with Windows XP and Ubuntu 8.04 dual booting. I recently upgraded to Ubuntu 10.04 by installing fresh from CD but leaving the previous /home folder as is. Things seemed to be working fine, but started finding that my mouse and keyboard were freezing. After a quick search on the internet, I found the following suggestions as shown here:- Ubuntu Forums Here the suggestion was to:- Edit /etc/default/grub, go to the line that begins like: GRUB_CMDLINE_LINUX_DEFAULT= Change it to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=off" After that, run this command: sudo update-grub and Reboot This seemed to have resolved the issue but after a couple of days I again find my mouse and keyboard freezing. I also find that my parallel port printer had also stopped working. I have saved the output of dmesg and my syslog. The first can be viewed here but the syslog had too many characters, so if someone can suggest an alternative to freetexthost, I can post it there. Moreover, if there is any other information that should be provided, do let me know. I do hope we can get to the bottom of this issue. Thank you in advance for any help that could be provided.

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• PHP - Centos OpenSSL error

  - by mabbs

  i'm currently having a problem with OpenSSL on my Centos 6.5 Server. it ran perfectly fine until sunday. and i checked the error_log and i saw this error in the log PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/openssl.so' - /usr/lib64/php/modules/openssl.so: cannot open shared object file: No such file or directory in Unknown on line 0 i tried phpinfo(); and i found that openssl is enabled i tried php -m it returned [PHP Modules] bz2 calendar Core ctype curl date dom ereg exif fileinfo filter ftp gd gettext gmp hash iconv interbase json libxml mbstring mcrypt memcache mysql mysqli openssl pcntl pcre PDO PDO_Firebird pdo_mysql pdo_sqlite Phar pspell readline Reflection session shmop SimpleXML snmp sockets SPL sqlite3 standard tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl zip zlib UPDATE this is what i got from rpm -qa | grep php just like what Mike Suggested php-php-gettext-1.0.11-3.el6.noarch php-mcrypt-5.3.3-3.el6.x86_64 php-interbase-5.3.3-3.el6.x86_64 php-pdo-5.3.3-27.el6_5.1.x86_64 php-5.3.3-27.el6_5.1.x86_64 php-mysql-5.3.3-27.el6_5.1.x86_64 php-snmp-5.3.3-27.el6_5.1.x86_64 php-gd-5.3.3-27.el6_5.1.x86_64 php-xml-5.3.3-27.el6_5.1.x86_64 php-pear-1.9.4-4.el6.noarch php-pecl-memcache-3.0.5-4.el6.x86_64 phpMyAdmin-3.5.8.2-1.el6.noarch php-common-5.3.3-27.el6_5.1.x86_64 php-cli-5.3.3-27.el6_5.1.x86_64 php-devel-5.3.3-27.el6_5.1.x86_64 php-mbstring-5.3.3-27.el6_5.1.x86_64 php-xmlrpc-5.3.3-27.el6_5.1.x86_64 php-pspell-5.3.3-27.el6_5.1.x86_64

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• SATA HDD not recognized by BIOS after Windows 7 reinstall

  - by RoliSoft

  I got Win32.Virut.56 virus, which is a very nasty stuff. I reinstalled my Win7, but it reappeared somehow. After hours of headache, I was able to remove it by booting into a live Ubuntu and running CureIT using Wine. I then started reinstalling Windows 7. After the "expanding files" stage it rebooted, however from that point on, my 160 GB Western Digital SATAII hard drive was not recognized. The bios just freezes at "SATAII 1: Detecting...". My other 1.5 TB Seagate SATAII hard drive works correctly. I tried switching cables; that didn't help. I googled this issue, but what came up were usually firmware problems. I can't update the firmware or do anything at all, because if I plug it in, it won't start. My motherboard is an ASRock 4Core1333-Viiv, if that helps. I'm now stuck on a live Ubuntu. I can't install Win7 on the 1.5 TB drive, because it's full of data I need. What do you think I could try to make the hdd work again? As for the moment, I don't have another computer to try if that one recognizes the hdd.

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• WRTU54G-TM router with 3rd party firmware; Can custom firmware include stock binary portions?

  - by dlamblin

  I've been doing a lot of reading online about the Linksys WRTU54G-TM router model that I now own. It seems getting a custom firmware onto it is not a problem. But no one is talking about retaining the Voip features (yet). So far they're all disappointed that it's not a SIP machine and used GSM over IPSec. Personally I don't care about using it with non-t-mobile. If I take the original firmware, shouldn't I be able to extract it, and it's SquashFS image, and then move all of the t-mobile specific binaries for enabling the calling features over to a custom firmware installation (maybe OpenWRT)? You might ask why, and the reason is, that if I do this I could retain my calling features, which I do want, and ssh to the router and use it to run additional software, as any OpenWRT router could do. Does anyone know if this can be done, and how the firmware's binaries could be gotten at and installed correctly? Update I have found someone working on 3rd party WRTU54G-TM firmware. I am still interested in my second part of the questions, that is can't the stock firmware images be pulled apart and have the close-source, if any, binary kernel modules moved into another more flexible custom firmware?

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• Cannot log into Oracle Enterprise Manager 11g: ORA-28001

  - by Álvaro G. Vicario

  I can no longer log into Oracle Enterprise Manager 11g. I get this error message: ORA-28001: the password has expired (DBD ERROR: OCISessionBegin) I could log into the server using SQL*Plus. I warned me that the password was going to expire in 7 days (which is not the same as being already expired). Following advice from several documents, I ran these commands from SQL*Plus: ALTER USER sys IDENTIFIED BY new_password; ALTER USER system IDENTIFIED BY new_password; SQL*Plus no longer warns about passwords, but I still cannot use the Enterprise Manager. Then I followed this to remove password expiration: ALTER PROFILE default LIMIT password_life_time UNLIMITED And I've also restarted the Oracle services. In case it was using cached credentials, I've tried to connect from several browsers in several computers. No way: I still get ORA-28001 in Enterprise Manager. What am I missing? Update: Some more info SQL> select username,ACCOUNT_STATUS,EXPIRY_DATE from dba_users; USERNAME ACCOUNT_STATUS EXPIRY_D ------------------------------ -------------------------------- -------- MGMT_VIEW OPEN SYS OPEN SYSTEM OPEN

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• Installing OEM Windows Server 2008 under KVM

  - by rancidfishbreath

  Issue I have an HP server that came with an OEM copy of Windows Server 2008. I have installed CentOS 5.4 on the hardware and am trying to install Windows Server 2008 as a KVM guest. When I attempt to install Windows Server 2008 it complains that I am trying to install on unsupported hardware. This issue is caused because the hardware SMBIOS information is not being passed to the KVM guest. Background Before I go any further I want to state that what I am trying to do is within the license. HP offers a supported solution for VMWare but does not have an official solution for KVM. After much research the platform I am going to use is CentOS and KVM so please do not suggest other platforms. I emailed the KVM developers mailing list and was told that this is possible and was given the advice that: "You can dump SLIC table of your host bios and provide it to guest bios using -acpitable parameter." I used dmidecode and got the parameters that need to be passed, but I do not know where to pass the parameters into. Update Looks like CentOS 5.4 uses virt-install instead of qemu. Qemu is in the package manager and I was able to install it after uninstalling qemu-img (they conflict and qemu contains the packages in qemu-img). So now I know how to pass the acpitable parameters, but I am having trouble mapping what came out of dmidecode into -acpitable.

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• Apache 403 after configuring varnish

  - by w0rldart

  I just don't know where else to look and what else to do. I keep getting a 403 error on all my vhosts after setting varnish 3.0 Apacher log: [error] [client 127.0.0.1] client denied by server configuration: /etc/apache2/htdocs Headers: http://domain.com/ GET / HTTP/1.1 Host: domain.com User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Connection: keep-alive Cookie: __utma=106762181.277908140.1348005089.1354040972.1354058508.6; __utmz=106762181.1348005089.1.1.utmcsr=OTHERDOMAIN.com|utmccn=(referral)|utmcmd=referral|utmcct=/galerias/cocinas Cache-Control: max-age=0 HTTP/1.1 403 Forbidden Vary: Accept-Encoding Content-Encoding: gzip Content-Type: text/html; charset=iso-8859-1 X-Cacheable: YES Content-Length: 223 Accept-Ranges: bytes Date: Sat, 01 Dec 2012 20:35:14 GMT X-Varnish: 1030961813 1030961811 Age: 26 Via: 1.1 varnish Connection: keep-alive X-Cache: HIT ---------------------------------------------------------- /etc/default/varnish: DAEMON_OPTS="-a ip.ip.ip.ip:80 \ -T localhost:6082 \ -f /etc/varnish/main.domain.vcl \ -S /etc/varnish/secret \ -s file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G" #-s malloc,256m" My vcl file: http://pastebin.com/axJ57kD8 So, any ideas what I could be missing? Update Just so you know, ports: NameVirtualHost *:8000 Listen 8000 and <VirtualHost 205.13.12.12:8000>

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• Mod_rewrite (CakePHP routing functionality) forbidden after Snow Leopard upgrade

  - by Ryan Ballantyne

  Hello ServerFault, I am using the standard Apple-provided installations of PHP 5.3 and Apache 2 to do web development on a Mac Pro that I just upgraded to Mac OS X 10.6 (Snow Leopard). The upgrade went well enough, if I ignore the fact that it destroyed my ability to get work done. ;) After the update, the CakePHP application I was developing started giving me 403 Forbidden errors when accessed. Based on the errors in the log file, I've determined that Apache is choking on the mod_rewrite rules in Cake's .htaccess file. Here's the file, in its entirety: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^$ app/webroot/ [L] RewriteRule (.*) app/webroot/$1 [L] </IfModule> It's not that the rules themselves are wrong, but that Apache is forbidding the use of mod_rewrite altogether. All other pages on the machine work fine, and the 403 errors go away if I comment out the .htaccess file (but nothing works, of course). In my httpd.conf file, I've tried changing this: <Directory /> Options FollowSymLinks AllowOverride None Order deny,allow Deny from all </Directory> To this: <Directory /> Options FollowSymLinks AllowOverride All Order deny,allow Allow from all </Directory> ...which has no effect. I don't know much about Apache configuration files, and I'm quite stuck on this. In fact, I know little enough that I'm not sure which information about my setup is needed to enable people to provide useful answers. I'm just using the vanilla OS X setup, nothing fancy. Googling has yielded no fruits for me this time, so I'm turning to you. Any ideas?

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• exim4 redirect mail sent to *@domain1.example.com to *@domain2.example.com

  - by nightcoder

  Current situation: We have a VPS that hosts a website example.org. Exim is configured to work as a smarthost. All emails sent through exim are successfully relayed to another mail server (that is working on example.com). Goal: To forward mail sent to *@example.org to *@example.com, i.e. change the recipient's address from *@example.org to *@example.com. Problem: If I send email to address *@example.org, then it seems exim doesn't change the address, it still relays the message to another mail server but recipient is still *@example.org. Maybe the redirect is not applied for some reason. Configuration and logs: /etc/exim4/update-exim4.conf.conf: dc_eximconfig_configtype='smarthost' dc_other_hostnames='' dc_local_interfaces='' dc_readhost='example.org' dc_relay_domains='example.org' dc_minimaldns='false' dc_relay_nets='0.0.0.0/32' dc_smarthost='example.com::26' CFILEMODE='644' dc_use_split_config='false' dc_hide_mailname='true' dc_mailname_in_oh='true' dc_localdelivery='maildir_home' /etc/exim4/conf.d/router/999_exim4-config_redirect (created by me): domain_redirect: debug_print = "R: forward for $local_part@$domain" driver = redirect domains = example.org data = [email protected] (for now data is set to a specific address for simplicity and testing) exim log when sending email to [email protected] (should be redirected to [email protected]): 2012-03-20 19:40:07 1SA4ud-0005Dw-7k <= [email protected] U=www-data P=local S=657 2012-03-20 19:40:08 1SA4ud-0005Dw-7k => [email protected] R=smarthost T=remote_smtp_smarthost H=domain2.com [184.172.146.66] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,2.5.4.17=#13053737303932,ST=TX,L=Houston,STREET=Suite 400,STREET=11251 Northwest Freeway,O=HostGator.com,OU=HostGator.com,OU=Comodo PremiumSSL Wildcard,CN=*.hostgator.com" 2012-03-20 19:40:08 1SA4ud-0005Dw-7k Completed So, the address is not changed :( Please help! I'm trying to make it work for half a day already :(

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• Upgrading PEAR from 1.9.0 to 1.9.1 fails

  - by Skelton

  Hi All, I'm willing to install phpunit 5.3 with MAMP 1.9 and there for I need to upgrade PEAR to version 1.9.1. The current version installed is 1.9.0. When I try the to upgrade I get the following: sudo pear channel-update pear.php.net sudo pear upgrade pear Could not get contents of package "/Applications/MAMP/bin/php5.3/bin/pear". Invalid tgz file. upgrade failed When I force the upgrade It still doesn't work: sudo pear upgrade --force PEAR downloading PEAR-1.9.1.tgz ... Starting to download PEAR-1.9.1.tgz (293,587 bytes) .............................................................done: 293,587 bytes upgrade ok: channel://pear.php.net/PEAR-1.9.1 PEAR: Optional feature webinstaller available (PEAR's web-based installer) PEAR: Optional feature gtkinstaller available (PEAR's PHP-GTK-based installer) PEAR: Optional feature gtk2installer available (PEAR's PHP-GTK2-based installer) PEAR: To install optional features use "pear install pear/PEAR#featurename" sudo pear -V PEAR Version: 1.9.0 As bindbn suggested: sudo pear install --offline /Users/tom/Downloads/PEAR-1.9.1.tgz Ignoring installed package pear/PEAR Nothing to install sudo pear upgrade --force --alldeps PEAR downloading PEAR-1.9.1.tgz ... Starting to download PEAR-1.9.1.tgz (293,587 bytes) .............................................................done: 293,587 bytes upgrade ok: channel://pear.php.net/PEAR-1.9.1 PEAR: Optional feature webinstaller available (PEAR's web-based installer) PEAR: Optional feature gtkinstaller available (PEAR's PHP-GTK-based installer) PEAR: Optional feature gtk2installer available (PEAR's PHP-GTK2-based installer) PEAR: To install optional features use "pear install pear/PEAR#featurename" pear -V PEAR Version: 1.9.0 I hope someone can figure this out! Thanks!

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• How to remove all Couchdb versions in Ubuntu 10.04 (server)? ( after multiple installs )

  - by DjangoRocks

  Hi all, I have done multiple installs of CouchDB using sudo aptitude install couchdb sudo ap-get install couchdb and more recently based on the instructions found at L http://wiki.apache.org/couchdb/Installing_on_Ubuntu May I know how do I uninstall or remove all the above installations? Best Regards. +++++++++++++++++++UPDATE++++++++++++++++++++++++ I've tried running the following commands: apt-get remove couchdb apt-get purge couchdb but received the following errors: (Reading database ... 39814 files and directories currently installed.) Removing couchdb ... invoke-rc.d: initscript couchdb, action "stop" failed. dpkg: error processing couchdb (--remove): subprocess installed pre-removal script returned error exit status 1 invoke-rc.d: initscript couchdb, action "start" failed. dpkg: error while cleaning up: subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: couchdb E: Sub-process /usr/bin/dpkg returned an error code (1) May I know how do i fix this? ON issuing the command : dpkg -l | grep couchdb I received the following response: rF couchdb 0.10.0-1ubuntu2 RESTful document oriented database, system D iF couchdb-bin 0.10.0-1ubuntu2 RESTful document oriented database, programs How do i uninstall CouchDB ? I think there's some file corruption?

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• Apache wont start after attempting to install SSL

  - by yummm

  Below is what my VirtualHosts look like in httpd.conf <VirtualHost *:80> # Admin email, Server Name (domain name) and any aliases ServerAdmin [email protected] ServerName mydomain.com ServerAlias www.mydomain.com # Index file and Document Root (where the public files are located) DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public # Custom log file locations LogLevel warn ErrorLog /home/mydomain/public_html/mydomain.com/log/error.log CustomLog /home/mydomain/public_html/mydomain.com/log/access.log combined </VirtualHost> <VirtualHost *:443> SSLEngine on SSLCertificateFile /etc/httpd/conf/ssl.crt/mydomain.com.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/mydomain.com.key ServerName mydomain.com DirectoryIndex index.php DocumentRoot /home/mydomain/public_html/mydomain.com/public </VirtualHost> I'm using the latest version of Apache on CentOS and there isn't any error being generated. Apache just will not start. Any ideas what I'm doing wrong? UPDATE - Found these messages in the error log: [Tue Mar 16 02:07:57 2010] [error] Init: Private key not found [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218710120 error:0D094068:asn1 encoding routines:d2i_ASN1_SET:bad tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218529960 error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218595386 error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error [Tue Mar 16 02:07:57 2010] [error] SSL Library Error: 218734605 error:0D09A00D:asn1 encoding routines:d2i_PrivateKey:ASN1 lib

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• Problem importing pictures from a digital camera with Windows 7

  - by snark

  Hi, Since I'm using Windows 7 (Beta, then RC, now RTM), I have issues when I download pictures from my digital cameras. It happens with my 2 cameras: a Canon Powershot S2 IS and a Canon Ixus 80 IS. When I plug a camera (any of them) to a USB port and switch it on in Play mode, the Autoplay function of Windows 7 starts with this screen: I select "Import pictures and videos" to call the native Windows 7 tool. It searches a bit for pictures to download from the camera and starts the transfer. However, during the transfer, I often get errors like this one: If I use "Try again", it works fine the second time and the picture is retrieved correctly. It's very annoying when it happens 20 or 30 times in a 500-picture download. I cannot leave it running standalone, as I have to watch for the errors and click on "Try again". Any idea what is causing these errors? I tried changing the USB port (normally the cameras are connected via a USB hub but it happens also when I connect them directly to a MB USB port) and the USB cable, but no success. I also checked the SD card by connecting them with a card reader and running a ChkDsk on them but it found no errors on the cards. Update: No problem when I copy the pictures manually with the Windows Explorer. And no problem either when I access the card with a reader. The builtin import tool of Windows is convenient as it sorts the pictures automatically by date (1 folder per day). And this is the way I sort my pictures

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• Yum installing wrong MySQL version on CentOS 5 (Amazon)

  - by Marius Stuparu

  I'm having trouble with a CentOS server running on AWS. This is CentOS 5.6 i386 from RightImage, but the problem was the same on all RightScale AMIs. When issuing the following command: yum install mysql mysql-server mysql-devel the only packages proposed by yum are MySQL-devel-community and MySQL-server-community. Which would't be a problem, except this package is old/incomplete, because it does not create a "mysqld" service, only a /etc/init.d/mysql (notice the missing d). That would't be a problem, I can start the service by doing ./etc/init.d/mysql start, and it starts OK, but there is no "mysql" (or other mysql*) command available. If I try to force a different version (yum install mysql50-server...) I get this yum error: mysql-5.0.77-4.el5_6.6.i386 from updates has depsolving problems --> mysql conflicts with MySQL-server-community (even when I don't have MySQL-server-community installed). I have tried this before and after yum update, in a fresh image. How can I install a working version of MySQL? I'm stuck on CentOS 5 because I want to install Kloxo (which does not yet support CentOS 6). I'm not interested in Webmin, and I can't afford cPanel. Thanks!

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• Network config for KVM on physical machine with single NIC and single public IP

  - by neo0

  I have a physical machine running CentOS 6.4 and I will rent a place to run it in a data center. I want to install KVM on that machine to run some virtual machines. The problem is my physical machine have only one NIC and the data center give me a public IP for that interface. So how should I configure network on the physical machine to make it assign for each vm a private IP that can connect to Internet. If I create a br0 bridged with eth0 interface and create a vm with option --bridge=br0 then KVM could not assign an IP for the vm so setup can not be done. Should I use NAT mode? Does KVM have any host-only network like Virtualbox? But the vm still has to connect to outside? Thank you! Update I install the guest network using NAT (--network network:default) and then I only have to port-forwarding from the host. But if I config br0 bridged with physical eth0 then the guest can not get an IP from boot. So I removed the br0 and it worked.

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• samba share not on network after upgrading to Ubuntu 12.04LTS. [migrated]

  - by Sylvain Huard

  I just upgraded an old Ubuntu box to 12.04LTS (machine named A-Ubuntu). This is an upgrade not a format re-install. All the accounts and config were preserved. The basic setup is a local network with 2 Ubuntu machines (let say A-Ubuntu, B-Ubuntu) and a MAC (C-MAC). Before the upgrade, all of them could see each other by their names not only the IP address. The local network has a D-Link Router where everybody is connected with RJ-45 wired etherenet (not wi-fi). Since the A-Ubuntu upgrade, we can't see this machine name on the Network and its name is not on machine list in the D-Link router anymore. We can see it's IP address only. I can't access A-Ubuntu from the other two by its name but I can ping it with its address (192.168.0.109). From A-Ubuntu, I can connect and see the shared samba folders on B-Ubuntu and C-MAC. But from B-Ubuntu and C-MAc, I can't connect to A-Ubuntu. Correct me if I'm wrong but this tells me that Samba should be fine and the real problem is that A-Ubuntu does not advertise its name on the Network so the D-Link does not have it in its table so nobody else finds it. After a lot of googling, I see that it is the job of avahi and mdns to do so. Those packages are running, I checked multiple config files for samba, avahi, mdns to see as if it is like the examples on the WEB and also similar to what I find on the working B-Ubuntu machine. This is the same. I did multiple service restart with samba, avahi, remove the firewall to make sure it does not block the hostname broadcast. I rebooted multiple time to make sure the update I was making were effective. Still, Can't see the A-Ubuntu name on the network. Any idea what it can be?, Where to look next?

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• Email test deferred (mail transport unavailable) with ClamAV

  - by dirt

  I'm trying to set up a simple new mail server; when I send a test email to the server the email is getting hung up during delivery (user mapping is found) and the email is never found in /home/user/Maildir/new Here is my maillog after a fresh reboot and test email, there are a few warnings I am unfamiliar with. Can you please point me in the right direction? Oct 25 14:54:57 loki dovecot: master: Dovecot v2.0.9 starting up (core dumps disabled) Oct 25 14:54:58 loki postfix/postfix-script[1369]: starting the Postfix mail system Oct 25 14:54:58 loki postfix/master[1370]: daemon started -- version 2.6.6, configuration /etc/postfix Oct 25 14:56:00 loki postfix/tlsmgr[1457]: warning: request to update table btree:/etc/postfix/smtpd_scache in non-postfix directory /etc/postfix Oct 25 14:56:00 loki postfix/tlsmgr[1457]: warning: redirecting the request to postfix-owned data_directory /var/lib/postfix Oct 25 14:56:00 loki postfix/smtpd[1455]: connect from mail-ob0-f180.google.com[209.85.214.180] Oct 25 14:56:01 loki postfix/smtpd[1455]: 1CF5E20A8B: client=mail-ob0-f180.google.com[209.85.214.180] Oct 25 14:56:01 loki postfix/cleanup[1461]: 1CF5E20A8B: message-id= Oct 25 14:56:01 loki postfix/qmgr[1379]: 1CF5E20A8B: from=, size=1788, nrcpt=1 (queue active) Oct 25 14:56:01 loki postfix/qmgr[1379]: warning: connect to transport private/scan: No such file or directory Oct 25 14:56:01 loki postfix/error[1462]: 1CF5E20A8B: to=, orig_to=, relay=none, delay=0.18, delays=0.15/0.02/0/0.01, dsn=4.3.0, status=deferred (mail transport unavailable) Oct 25 14:56:01 loki postfix/smtpd[1455]: disconnect from mail-ob0-f180.google.com[209.85.214.180] master.cf snippets: # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ========================================================================== smtp inet n - n - - smtpd submission inet n - n - - smtpd -o smtpd_tls_security_level=encrypt # -o smtpd_sasl_auth_enable=yes # -o smtpd_client_restrictions=permit_sasl_authenticated,reject # -o milter_macro_daemon_name=ORIGINATING smtps inet n - n - - smtpd -o smtpd_tls_wrappermode=yes # -o smtpd_sasl_auth_enable=yes # -o smtpd_client_restrictions=permit_sasl_authenticated,reject # -o milter_macro_daemon_name=ORIGINATING scan unix - - n - 16 smtp -o smtp_data_done_timeout=1200 -o smtp_send_xforward_command=yes -o disable_dns_lookups=yes 127.0.0.1:10026 inet n - n - 16 smtpd -o content_filter= -o local_recipient_maps= -o relay_recipient_maps= -o smtpd_restriction_classes= -o smtpd_client_restrictions= -o smtpd_helo_restrictions= -o smtpd_sender_restrictions= -o smtpd_recipient_restrictions=permit_mynetworks,reject -o mynetworks_style=host -o smtpd_authorized_xforward_hosts=127.0.0.0/8

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• How to install a private user script in Chrome 21+?

  - by Mathias Bynens

  In Chrome 20 and older versions, you could simply open any .user.js file in Chrome and it would prompt you to install the user script. However, in Chrome 21 and up, it downloads the file instead, and displays a warning at the top saying “Extensions, apps, and user scripts can only be added from the Chrome Web Store”. The “Learn More” link points to http://support.google.com/chrome_webstore/bin/answer.py?hl=en&answer=2664769, but that page doesn’t say anything about user scripts, only about extensions in .crx format, apps, and themes. This part sounded interesting: Enterprise Administrators: You can specify URLs that are allowed to install extensions, apps, and themes directly through the ExtensionInstallSources policy. So, I ran the following commands, then restarted Chrome and Chrome Canary: defaults write com.google.Chrome ExtensionInstallSources -array "https://gist.github.com/*" defaults write com.google.Chrome.canary ExtensionInstallSources -array "https://gist.github.com/*" Sadly, these settings only seem to affect extensions, apps, and themes (as it says in the text), not user scripts. (I’ve filed a bug asking to make this setting affect user scripts as well.) Any ideas on how to install a private user script (that I don’t want to add to the Chrome Web Store) in Chrome 21+? Update: The problem was that gist.github.com’s raw URLs redirect to a different domain. So, use these commands instead: # Allow installing user scripts via GitHub or Userscripts.org defaults write com.google.Chrome ExtensionInstallSources -array "https://*.github.com/*" "http://userscripts.org/*" defaults write com.google.Chrome.canary ExtensionInstallSources -array "https://*.github.com/*" "http://userscripts.org/*" This works!

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• How to handle server failure in an n-tier architecture?

  - by andy

  Imagine I have an n-tier architecture in an auto-scaled cloud environment with say: a load balancer in a failover pair reverse proxy tier web app tier db tier Each tier needs to connect to the instances in the tier below. What are the standard ways of connecting tiers to make them resilient to failure of nodes in each tier? i.e. how does each tier get the IP addresses of each node in the tier below? For example if all reverse proxies should route traffic to all web app nodes, how could they be set up so that they don't send traffic to dead web app nodes, and so that when new web app nodes are brought online they can send traffic to it? I could run an agent that would update all the configs to all the nodes, but it seems inefficient. I could put an LB pair between each tier, so the tier above only needs to connect to the load balancers, but how do I handle the problem of the LBs dying? This just seems to shunt the problem of tier A needing to know the IPs of all nodes in tier B, to all nodes in tier A needing to know the IPs of all LBs between tiers A and B. For some applications, they can implement retry logic if they contact a node in the tier below that doesn't respond, but is there any way that some middleware could direct traffic to only live nodes in the following tier? If I was hosting on AWS I could use an ELB between tiers, but I want to know how I could achieve the same functionality myself. I've read (briefly) about heartbeat and keepalived - are these relevant here? What are the virtual IPs they talk about and how are they managed? Are there still single points of failure using them?

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• Graphics and USB devices freezing soon after OS loads

  - by Andrew

  I run Ubuntu/Windows dual boot. Last night I started the upgrade to Ubuntu 12.04, and my computer has not worked since in either Windows or Ubuntu. Here's what I got when I rebooted after the upgrade, and continue to get every time I boot: Gets to GRUB screen OK. Choose Ubuntu - black screen or crazy purple lines. At first I assumed something went wrong with the upgrade (often happens). Choose Windows - works fine, I log in, but soon after that the graphics freeze (sometimes with purple artifacts). The keyboard and mouse (both USB) also lose power at the same instant, and none of the USB ports have power to them. This happens sooner or later every time I boot. Update: the HDD also appears to lose power at the same point. I have tried a live CD, but my computer refuses to boot any CD even after disabling all other boot options in the BIOS. I have disconnected everything except keyboard, mouse, graphics card with one monitor, one RAM sick and HDD; no change. I also took the little battery out to reset CMOS. I am pretty sure no matter how wrong the Ubuntu upgrade went, it wouldn't cause the above symptoms in Windows. So the only explanation I can think of is that a hardware failure occurred at the same time. Some possible causes of this I can think of are: A couple of days before this, I added a third screen (which worked fine). About a week before, my house lost power in a storm (no ill effects over the past few days though). What can I do, other than buy a new motherboard/CPU and hope it works? Unfortunately I don't have another box to swap parts into to test at the moment.

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• How to restore broken Ethernet functionality on Mac G5 running Mac OS 10.4.11 (Tiger)

  - by willc2

  I had a disk error that rendered my Mac unbootable. I repaired it with Tech Tool 4, but now networking does not work. Network Preferences reports that my Ethernet cable is unplugged. I know this is bogus because when I boot from an emergency partition, networking works correctly. Furthermore, wireless networking is also broken, which I tested with a known-good Wi-Fi dongle. Whenever I try to change Network Port Configurations by creating a New or Renaming an existing one, example: I get this message in the console: Error - PortScanner - setDevice, device == nil! Error - PortScanner - setDevice, device == nil! In sets of two as shown. When I try to invoke the Network Diagnostics app, it immediately crashes. My first thought is to reinstall Tiger with the Archive and Install method so I don't have to reinstall all my applications but I have lost my Tiger installer disk. My next thought is to buy Leopard for $107 on Amazon. If there is any way I can just repair my Tiger install I would be happy to save that money, though. This is not my main machine and I am loathe to put more money into it. How can I recover my network functionality? UPDATE: I found my Tiger install disk and tried an Archive and Install. It failed with an unhelpful error message along the lines of "Can't install, try again". I tried again but had the same error. My guess is, some corrupt or missing file in my User folder is preventing migration. I have a backup created with Super Duper that is a bit out of date but will startup the machine (with functional networking). I would love to just copy over the file(s) that got messed up but I don't even know where to look. What is the likely location of the System files that would cause the aforementioned symptoms?

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• How to set up QoS on ADSL router (terracom) for prioritizing browsing

  - by DBZ_A

  I want to configure the ADSL router which connects 10+ machines to the internet. I want to give maximum priority to browsing (ports 80,443) and set low priority for bittorrent etc.(port 42180) I have been experimenting with settings , but with no luck. There are three settings which confuse me, along with my understanding. 802.1 Priority - Related to LAN level, possible values 0-7 , higher numbers means higher priority. 'Mark traffic priority' - clueless about this. IPP/DS - IP Precedence - possible values 0-7 ; 6 & 7 are reserved, so set 5 for highest priority. Or when using DSCP - set 46 for highest priority. Please help me in getting this done... Similer question for another model of router here , but with less number of confusing options :) How to configure QoS on home router Update: from discussion on another thread, QoS can control only upstream traffic (from router to the internet) , while this may in turn affect downstream traffic rate, there is no direct control over data coming into the router.

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