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• Pinning based on origin of a reprepro repository.

  - by Shtééf

  I'm on Ubuntu 10.04, and trying to set up a repository using reprepro. I'd also like the pin everything in that repository to be preferred over anything else, even if packages are older versions. (It will only contain a select set of packages.) However, I cannot seem to get the pinning to work, and believe it has something to do with the repository side of things, rather than the apt configuration on the client. I've taken the following steps to set up my repository Installed a web server (my personal choice here is Cherokee), Created the directory /var/www/apt/, Created the file conf/distributions, like so: Origin: Shteef Label: Shteef Suite: lucid Version: 10.04 Codename: lucid Architectures: i386 amd64 source Components: main Description: My personal repository Ran reprepro export from the /var/www/apt/ directory. Now on any other machine, I can add this (empty) repository over HTTP to my /etc/apt/sources.list, and run apt-get update without any errors: Ign http://archive.lan lucid Release.gpg Ign http://archive.lan/apt/ lucid/main Translation-en_US Get:1 http://archive.lan lucid Release [2,244B] Ign http://archive.lan lucid/main Packages Ign http://archive.lan lucid/main Sources Ign http://archive.lan lucid/main Packages Ign http://archive.lan lucid/main Sources Hit http://archive.lan lucid/main Packages Hit http://archive.lan lucid/main Sources In my case, now I want to use an old version of Asterisk, namely Asterisk 1.4. I rebuilt the asterisk-1:1.4.21.2~dfsg-3ubuntu2.1 package from Ubuntu 9.04 (with some small changes to fix dependencies) and uploaded it to my repository. At this point I can see the new package in aptitude, but it naturally prefers the newer Asterisk 1.6 currently in the Ubuntu 10.04 repositories. To try and fix that, I have created /etc/apt/preferences.d/personal like so: Package: * Pin: release o=Shteef Pin-Priority: 1000 But when I try to install the asterisk package, it will still prefer the 1.6 version over my own 1.4 version. This is what apt-cache policy asterisk shows: asterisk: Installed: (none) Candidate: 1:1.6.2.5-0ubuntu1 Version table: 1:1.6.2.5-0ubuntu1 0 500 http://nl.archive.ubuntu.com/ubuntu/ lucid/universe Packages 1:1.4.21.2~dfsg-3ubuntu2.1shteef1 0 500 http://archive.lan/apt/ lucid/main Packages Clearly, it is not picking up my pin. In fact, when I run just apt-cache policy, I get the following: Package files: 100 /var/lib/dpkg/status release a=now 500 http://archive.lan/apt/ lucid/main Packages origin archive.lan 500 http://security.ubuntu.com/ubuntu/ lucid-security/multiverse Packages release v=10.04,o=Ubuntu,a=lucid-security,n=lucid,l=Ubuntu,c=multiverse origin security.ubuntu.com [...] Unlike Ubuntu's repository, apt doesn't seem to pick up a release-line at all for my own repository. I'm suspecting this is the cause why I can't pin on release o=Shteef in my preferences file. But I can't find any noticable difference between my repository's Release files and Ubuntu's that would cause this. Is there a step I've missed or mistake I've made in setting up my repository?

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• How to safely backup MySQL using VSS-based backup solutions

  - by Rhyven

  One of my clients is running MySQL on a Windows Server 2008 system. Their regular backups are performed using StorageCraft's ShadowCopy, which uses the VSS service to perform backups of open files. Some investigation indicates that MySQL is not entirely VSS-aware, and that the tables need to be locked prior to the shadow operation, then unlocked afterwards. There is a post at http://forum.storagecraft.com/Community/forums/p/548/2702.aspx which indicates the steps that need to be performed, however the user had some difficulty in performing them and no follow up solution was ever posted. Specifically, they succeeded in writing a batch file to lock the database, however once the batch file returns from MySQL it drops the connection and thus relinquishes the lock. I'm looking for a method that I can send the MySQL command FLUSH TABLES WITH READ LOCK, then perform the backup, then send UNLOCK TABLES when the backup is complete. Alternatively, I can exclude the MySQL data storage folder from backup, and schedule a mysqldump backup into a folder that will then be backed up by VSS. Can I have some recommendations please?

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• ACL in linux-based samba shares

  - by Odin

  If I mount a samba share like this from a linux server using ACL in ext3... mount -t cifs //192.168.0.10/smbshare /mnt/smbshare -o user=root password=secret ...and access the share with linux/smb-user smbuser. I have given smbuser write access to all catalogs, but when I write something to the share the owner becomes root (the user that mountet the share). Is there any possibility to make smbuser the owner of the files/catalogs he creates even if the share is mountet by the root-user? This case is supposed to work on a linux terminal server so many different users access the smb share (mountet by root).

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• What is the best OS for a server hosting a simple Ruby on Rails based pastebin

  - by Koning Baard XIV

  I have created a simple pastebin in Ruby on Rails and Python. I want to host it in an intranet and it will have like about 1000 users. I want to use one Apache server with a cluster of Mongrel servers. The server itself is a 2 GHz Intel Centrino with 2 GB RAM. What do you think is the best OS to host this? I thought about Damn Small Linux or a custom LFS system. Ubuntu servers come with loads of stuff I don't need. Maybe there are some better OSes? It must be capable of: Running Apache Running Ruby Running Python Running Mongrel with Ruby on Rails SSH Can anyone reccomend me one? Thanks. PS: I am not going to run Windows Server or Mac OS X Server (Mac's are expensive).

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• Web Based Windows Explorer for Linux System

  - by Shadi Almosri

  Does anyone know of a program/script that runs on Linux that can give us a nice GUI for browsing and managing shared system folders similar in the way that windows explorer would work? So would allow, upload, download, file modification etc. It's a way to still have access to all our files stored on the system from any location with internet access. Thanks in advance

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• how to redirect http request to another internal machine based on URL

  - by Ali Shafai

  I have a windows 2008 server at home (on a vmware server) along with other virtual machines, I want to open port 80 in my firewall, but I want to redirect the request to the correct vm. for example if the request is http://myserver/SVN I want it to go to my svn vm, if it's for http://myserver/Blog I want to go to another vm. what's the best approach?

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• My HP-Vista based laptop has become very slow recently

  - by goldenmean

  My HP laptop which has Vista Home premium. When I try to start Firefox, internet explorer, it becomes very slow. No other app. When i checked the Performance in Task Manager. It shows the Physical memory , Free as 0 bytes, almost always. This has been recently. Earlier it didn't used to be zero. Laptop has 2GB of RAM. I have nothing running in my tray except - Sound control, Laptop power plan indicator,Network status indicator. There are no other processes whose memory usage adds up to so high to make Free memory as 0. Then what could be hogging the memory and make the laptop very slow. Any pointers would help as it is crawling at the moment.

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• Where to find a tag based file manager?

  - by samoanbiscuit

  I'm a CS uni student in a country with limited bandwidth, and I find that I download files (particularly install files) for reuse\reinstallation\giving to my friends.. I've kept these files in different folders, and now find it extremely hard to find them, and keeping track of obselete files (the almost weekly releases of iTunes versions, or latest 7zip release or the .Net framework installers). What I would like to find is a file manager that could support tags, so instead of hierachical folders, i could find\view files according to their tags...

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• eclipse adding java ant based project: Specified buildfile does not contain a javac task

  - by ufk

  Hello. I have a project that i wrote for apache tomcat. I started working with eclipse i want to import the project to eclipse ide. using eclipse 3.6.1. when i create a new project using : File - New - Other - Java - Java Project from Existing Ant Buildfile and i provide the build file location i get the following error: Specified buildfile does not contain a javac task I have a red5 project that i used the same method and it worked. what am i missing? do i need to add something to the ant build file to make it work? what exactly ? where can i find more information regarding this specific subject ? thanks!

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• Client certificate based encryption

  - by Timo Willemsen

  I have a question about security of a file on a webserver. I have a file on my webserver which is used by my webapplication. It's a bitcoin wallet. Essentially it's a file with a private key in it used to decrypt messages. Now, my webapplication uses the file, because it's used to recieve transactions made trough the bitcoin network. I was looking into ways to secure it. Obviously if someone has root access to the server, he can do the same as my application. However, I need to find a way to encrypt it. I was thinking of something like this, but I have no clue if this is actually going to work: Client logs in with some sort of client certificate. Webapplication creates a wallet file. Webapplication encrypts file with client certificate. If the application wants to access the file, it has to use the client certificate. So basically, if someone gets root access to the site, they cannot access the wallet. Is this possible and does anyone know about an implementation of this? Are there any problems with this? And how safe would this be?

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• How to use WPA2 client mode in the Linux-based Cisco WAP4410N access point

  - by joechip

  I have a Cisco WAP4410N access point that I want to use as a client to connect to a WPA2 wireless network (for WLAN service monitoring purposes). Supposedly this access point supports a "Wireless Client/Repeater" mode that allows to do this. The Repeater function is optional (I have that box unchecked so that nobody can connect to this access point wirelessly). I have verified through SSH that the access point gets configured as a client and not as a Master. But it never associates to the SSID I ask it to. This is what iwconfig shows: ath04 IEEE 802.11ng ESSID:"myownssid" Mode:Managed Channel:0 Access Point: Not-Associated Bit Rate:0 kb/s Tx-Power:14 dBm Sensitivity=1/3 Retry:off RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=0/94 Signal level=161/162 Noise level=161/161 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Although I've never done this from the command line, I suppose I could use wpa_supplicant or wpa_client to associate it, but I don't know how to do that without editing configuration files and the filesystem is readonly. Besides, I would have to run those commands manually after every reboot. I'd like to know how to do this the Cisco way, if possible. If not, any trick to make this work would be useful. Edit: This is with the latest firmware, 2.0.4.2. And I found that not all of the filesystem is readonly, since /var and /tmp are mounted with type ramfs.

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• Display maintenance site to requesters based on their IP address

  - by user64294

  Hi all. I would like to set a special configuration in our apache web server. I would like to display sites to the users according to their IP addresses. We plan to upgrade our web sites. During the upgrade we'll put a maintenance site: so all the users which will connect to our web sites will get this site. There are 200 websites affected by the upgrade, so I don't want to change apache settings for each one. In order to test the upgrade i need to set apache to let only my IP address to access to asked site. If my IP address is a.b.c.d and if i ask for test.com i want to see it. but all other users, having a different IP address, should get the maintenane site even if they look for test.com. Our webserver is hosted out of the office (ovh.com france). The testers are the developers at our office and me. We can take some sites and enable them for test in which we implement IP restrictions in each website: the idea is on these websites, if the visitor's IP address is different from our office IP address we redirect this visitor to our maintenance website else we display the website. Is there a way to do this? Thank you.

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• VAIO as a Linux based netbook

  - by Noufal Ibrahim

  I'm planning to refresh my laptop. I've been using a thinkpad T42 for a long time and run Ubuntu on it. I'm planning to move to using a desktop for all my heavy work and getting a very light netbook style machine for mobile use. I need a decent keyboard, good battery life and a display that's bright and responsive. I'm evaluating a couple of laptops including a mac but have never come across information about a Sony Vaio. Do any of the people have experience with the laptop? What are your opinions? Does it work fine with Linux? Is it tinkerable (a big problem with the macbooks). How's the build quality, how's the service?

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• Free, Linux-based rescue CD for Windows machines

  - by Adam Matan

  Hi, Too often, I'm being called to help a friend who screwed a Windows machine by some creative methods. Th usual remedy is backing up the hard drive contents and reinstalling. Right now, this is done by removing the defected hard drive to my machine. I figured out that using a rescue disk running some version of Linux might ease the process. I'm looking for: NTFS access Partition tools Large variety of drivers (Network, Hard drives, etc.) GUI and some rescue wizards a great plus. Any ideas? Adam

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• Where to go to see an exception thrown by a browser based java app

  - by vaccano

  I have a java app that is running in my browser. At a specific point the app will crash. I would like to find the exception that is being thrown (if possible) so I can show it to the support of the company that makes the app. Is there a standard place for this? Or a way that capture it? (So I can prove that it is happening.) I am using Firefox, but could use IE if needed.

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• Threading in Thunderbird based on subject

  - by MrStatic

  I am in Thunderbird 3.0.4 which is the latest (as of now) for windows. I have edited the about:config as per the Mozilla Mail/News wiki I have tried with mail.correct_threading as false as well. After restarting Thunderbird it still does not thread per just subject/date. We use DeskPro which emails out to each tech every time a support ticket is created/replied to but since these are notices they do no include In-Reply-To headers. For these emails each subject line is exactly the same for each ticket. Curious if anyone can shed some light on this.

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• Changing Corosync/Heartbeat pair's active node based on MySQL/Galera cluster state

  - by Hace

  Background I'm planning on building a High Availability "cluster" for our Zabbix instance by placing two physical servers in one server room and two in another server room. In each server room one of the physical servers will run Zabbix on RHEL and the other will run Zabbix's MySQL database, also on RHEL. I'd prefer synchronous replication for the MySQL nodes so I'm planning on using Galera in a master-slave configuration. The Zabbix instances on the two Zabbix servers would be controlled by Heartbeat/Corosync (although Red Hat Cluster Suite is also an option...) If the Zabbix server in Server Room A goes down, the one in Server Room B becomes active (and vice versa). Ditto for the MySQL servers/instances. If either of those cases happen, however, the connection between the Zabbix server and the MySQL server becomes significantly slower as ti has to travel over WAN. Question Is it possible to configure the Heartbeat/CoroSync pair to instruct the MySQL/Galera cluster to change the master node to switch to (if available) the one that's in the server room as the active Heartbeat/Corosync -node and (more challengingly) is it possible to do the same in the other direction, i.e have the Galera cluster change the active Heartbeat/CoroSync server to be in the same room as the active MySQL master server in case of a failover in over to avoid unnecessary WAN transfers between the application and its DB? Theories Most likely I can get CoroSync to run something that'd log in to one of the DB nodes to change the MySQL/Galera master but I don't know if it's really possible to do anything similar in the other direction in Galera. Is it possible to define a "service" in CoroSync/Heartbeat so that both the service and its MySQL service would migrate as one if possible. Using the DB server that's behind WAN should still be a better option to DB downtime. Am I just using too many tools to solve a problem that'd be far simpler with something else?

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• Postfix: Modify sender address based on recipient

  - by PJ P

  We have a Postfix server that receives mail from our application servers. Senders are in the form [email protected] (where host.fqdn can vary, depending on source server) and recipients can be internal or external users. Messages going to external users should have the sender changed to [email protected]. I have tried using canonical maps, but since that is handled by the cleanup daemon, before any transport decisions are made, it would affect all sender addresses. I have also tried creating a custom smtp transport with generic mappings and configuring transport_maps to use that custom smtp transport for external domains. However, generic mappings affect both sender and recipient addresses. Lastly, I've tried the following: Create a custom smtpd daemon that specifies sender canonical maps and a unique transport table. Send all externally addressed mail to that custom daemon. Ideally, sender canonical maps would transform the sender address and the unique transport table would relay messages to the internet. However, evidently, only one transport table can be used per Postfix instance. I want to avoid creating an entirely new Postfix instance to accommodate this rewriting. Any suggestions? (and thanks in advance)

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• Redirecting to a diferent exe for download based on user agent

  - by Ra

  I own a Linux-Apache site where I host exe files for download. Now, when a user clicks this link to my site (published on another site): http://mysite.com/downloads/file.exe I need to dynamically check their user agent and redirect them to either http://mysite.com/downloads/file-1.exe or http://mysite.com/downloads/file-2.exe It seems to me that I have to options: Put a .htaccess file stating that .exe files should be considered to be scripts. Then write a script that checks the user agent and redirects to a real exe placed in another folder. Call this script file.exe. Use Apache mod-rewrite to point file.exe to redirect.php. Which of these is better? Any other considerations? Thanks.

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• Perform action based on load avg

  - by sfx

  I'm running some web applications on an debian server and have to struggle with ddos attacks sometimes. It's eating up all my resources and I can't ssh anymore into the server. An idea was to drop all connections if the load avg is too high, so there are still resources for me and accept new connections if the load avg is low enough. Since this has to work under heavy load I'm afraid a cronjob wouldn't be fast enough or take too much resources. tl;dr: Is there a way to configure the behavior if the load avg is above a specific threshold?

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• Refering to another field in a form and return entries based on the filed

  - by Claus Machholdt

  Structure of DB is: Org_Year(Table) ID Org_Name_ID Org_Year Ft(Table) ID Org_Year_ID Count Org_Name(Table) ID Org_Name I've created a form to input data into Ft. Form has reference to Org_name. I should be able to choose between different org first. Afterwards i want to choose which year to enter data into Ft for. I only want to be presented with a list of Years according to the entries in the Org_Year table, where org matches my selection in the dropdown above. The query to populate the select box (Org_year_Box) is: SELECT Org_Year FROM Org_Year WHERE Org_Name_ID=Organisation_Name_ID.value; I't doesn't return the Years for the given Org_id when using the above query. But if i replace "Organisation_Name_ID.value" with the actual value ie. "2" it returns the correct years. How to do?

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• Which linux-based firewall?

  - by Atlas

  We are looking to replace our current aging firewall/router with a new one. We would prefer it to be free/opensource if possible. Our minimum requirements would be: 1) Site-to-site VPN 2) Web URL/IP filtering 3) 2 WAN connections with load-balancing 4) Easy-to-use web inferface Any suggestions? and why you chose yours.

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• Designing a software based load balancer

  - by Kishore pandey

  Hello to all Server fault users, I am new to this website but have constantly been using the mother website, stackover flow. Well to begin with, i would like to design a load balancer for the organization i am working for. As i am very new to this whole, idea about load balancing and networks. I am finding it very difficult to start my project. I did a lot of research on already existing load balancer and found some(HAPROXY,NGINX) that could solve my problems, but the point is, I am still in a dilemma if they could answer the following requirements of mine: The client and server in my architecture are distributed. The load balancer should take care of the firewall. LB server should balance the load among all servers present in WWW cloud. The LB server should have some sort of configuration file, with the help of which it is possible to configure the servers. Heart beat: With the help of which it would be possible to check if any server is down, if any server is down the request should be passed to some other server. Various load balancing algorithms of the incoming requests. Easy error handling. It should be fairly possible to prioritize the incoming requests. Is there any already available load balncer solution on the market that could satisfy these requirements? If not is there any base code available with the help of which i could develop my own load balncer. If not where should i start from scratch? I am practically new to everything. Any help from a load balancer expert is very much appreciated. Thanx a ton in advance. Cheers and regards. Kishore

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• Looking for a windows-based WebDAV enabled editor (for code)

  - by Evert

  Hi guys, I'm looking for a good editor for windows with built-in WebDAV support. I'm aware of Netdrive, Webdrive and Windows' built-in WebDAV client, but these don't work as well, because they need to emulate a true filesystem. Has anyone came across this? I'm used to Coda on OS/X, so I'm hoping for something similar.

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• Web based console connections not working in Windows 7 posted: Jan 20, 2010 8:55 AM

  - by nmeth

  For slightly complicated reasons we tend to give people console access to VMs via the webui. This has worked fine in the past, however when the users update their client machines to Windows 7 (or Vista, I am told, although I have not tested that), then the console fails to work. On IE8, having allowed the ActiveX control, the tab causes a "Internet Explorer has stopped working" dialog. On Firefox 3.5 , once the plugin has been installed, using the console causes the browser to crash. I've updated to the most recent VC 2.5 release, and ESX 3.5u5. Anyone else seeing this? Any clues how to get round it (other than using the fat client). Nigel.

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