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Articles indexed Wednesday June 11 2014

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• Using Openfire for distributed XMPP-based video-chat

  - by Yitzhak

  I have been tasked with setting up a distributed video-chat system built on XMPP. Currently my setup looks like this: Openfire (XMPP server) + JingleNodes plugin for video chat OpenLDAP (LDAP server) for storing user information and allowing directory queries Kerberos server for authentication and passwords In testing with one set of machines (i.e. only three), everything works as expected: I can log in to Openfire and it looks up the user information in the OpenLDAP database, which in turn authenticates my user with Kerberos. Now, I want to have several clusters, so that there is a cluster on each continent. A typical cluster will probably contain 2-5 servers. Users logging in will be directed to the closest cluster based on geographical location. Something that concerns me particularly is the dynamic maintenance of contact lists. If a user is using a machine in Asia, for example, how would contact lists be updated around the world to reflect the current server he is using? How would that work with LDAP? Specific questions: How do I direct users based on geographical location? What is the best architecture for a cluster? -- would all traffic need to come into a load-balancer on each one, for example? How do I manage the update of contact lists across all these servers? In general, how do I go about setting this up? What are the pitfalls in doing this? I am inexperienced in this area, so any advice and suggestions would be appreciated.

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• options for deploying application

  - by terence

  I've created a simple web application, a self-contained tool with a user system. I host it publicly for everyone to use, but I've gotten some requests to allow companies to host the entire application privately on their internal systems. I have no idea what I'm doing - I have no experience with deployment or server stuff. I'm just some person who learned enough JS and PHP to make a tool for my own needs. The application runs with Apache, MySQL, and PHP. What's the best way to package my application to let others run it privately? I'm assuming there's better options than just sending them all the source code. I'd like to find a solution that is: Does not require support to set up (I'm just a single developer without much free time) Easy to configure Easy to update Does there exist some one-size-fits all thing that I can give to someone, they can install it, and bam, now when they go to http://myapplication/ on their intranet, it works? Thanks for your help.

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• DNS slow after losing DNS Server

  - by Tim

  We have set up a small Windows Server 2008 R2 network with a domain controller which is also acting as the DNS server for the network (we opted to install DNS when setting up the domain). This network isn't connected to the Internet in any way, so all machines have been configured to use the IP address of the domain controller as their primary DNS and no secondary DNS server has been configured. If we shut down or unplug the network cable from the domain controller, DNS lookups become quite slow and the performance of the network suffers. For example, running a ping command using a hostname takes around 5-6 seconds to resolve the name. I presume this is because it is looking for the DNS, then falling back to some other method of resolving the names as the DNS server is now gone. All the machines have static IP addresses so we are considering just putting all entries in the HOSTS file of each machine. However, it would be nice to have a centralised DNS in case we one day change the IP of one of the machines. Is there a better way to speed this up?

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• How can I avoid logging file not founds commonly caused by vulnerability scanners?

  - by agweber

  My apache logs are pretty much full of 'admin.php' not found or unable to stat and similar statements for wp-login.php, default.php, and so on that are often sought after by vulnerability scanners. Can I configure apache to avoid logging these statements for certain files? I don't want to filter out all file not founds as I'd like to fix bad links that I may have put out over the years that no longer correspond to the same files. I can use a tool like fail2ban or denyhosts, but from previous experiences it comes from so many places that those errors are still going to pile up, and the reducing those error messages are what this question is asking about.

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• Amazon EC2 - Unable to connect to MySQL

  - by alexus

  I'm having issue connecting from one VM to another # nmap -p3306 ip-XX-XX-XX-XX.ec2.internal Starting Nmap 6.40 ( http://nmap.org ) at 2014-06-10 17:50 EDT Nmap scan report for ip-XX-XX-XX-XX.ec2.internal (XX.XX.XX.XX) Host is up (0.000033s latency). PORT STATE SERVICE 3306/tcp closed mysql Nmap done: 1 IP address (1 host up) scanned in 1.05 seconds # in my Security Group I allowed Inbound connectivity via port TCP, portrange 3306 and Source 0.0.0.0/0, so theoratically it should work, but in reality it doesn't( I'm running red hat enterprise linux 7 on both VMs. mariadb.service running fine on another VM and I am able to connect to it locally. DB's: # netstat -anp | grep 3306 tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 2324/mysqld # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # Any ideas what else I missed?

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• Add an Excel file as a linked server in SQL 2012

  - by MgSam

  I'm trying to add a linked server to an Excel 2010 file from SQL Server 2012. Every reference I've found online for doing this is using older versions of SQL Server, and the driver that they tell you to use 'Microsoft.Jet.OLEDB.4.0', is not present in 2012 from what I can tell. Can anyone tell me which provider I need to use and what the product name, data source, and provider string should be? For reference, this is the screen I'm looking at: Thanks.

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• Error 0x8007007e When trying to mount WinPE 5 wim in Windows 7 using Powershell

  - by BigHomie

  Using ADK for Windows 8.1, and the DISM cmdlets that come with them. I have WMF 4.0 installed. My machine is Windows 7 x64 SP1, and I'm trying to mount the wim using PS C:\Users\BigHomie> Mount-WindowsImage -ImagePath 'C:\Program Files (x86)\Windows Kits\8.1\Assessment and Deployment Kit\Windows Preinstallation Environment\x86\ en-us\winpe.wim' -Path C:\WinPE_x86 -index 1 And receive the following error: Mount-WindowsImage : DismInitialize failed. Error code = 0x8007007e At line:1 char:1 + Mount-WindowsImage -ImagePath 'C:\Program Files (x86)\Windows Kits\8.1\Assessmen ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~ + CategoryInfo : NotSpecified: (:) [Mount-WindowsImage], COMExcep tion + FullyQualifiedErrorId : Microsoft.Dism.Commands.MountWindowsImageCommand Using dism.exe works fine. Update Forgetting I had this problem, I went to mount a wim using the Powershell ISE and actuallygot a visual error message about "C:\Program Files (x86)\Windows Kits\8.1\Assessment and Deployment Kit\Deployment Tools\x86\DISM\api-ms-win-downlevel-advapi32-l4-1-0.dll" not being installed. After checking that the dll did in fact exist in the folder I called regsvr32 and received another error message Will try reinstalling as recommended.

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• How do I troubleshoot a page not found error when configuring IIS6 Windows Server 2003? [Page Not Found]

  - by Vinicius Ottoni

  I have configured IIS6 in my windows server 2003 with this link: http://www.simongibson.com/intranet/iis6/ After that I create a new web site inside Web Sites directory. Inside the physical path I created an index.htm that has: <html> <body>Test</body> </html> But I got the following error: "The page cannot be found". When I put the same index file inside the Web Site Default physical path, it works. I configured the new web site with the link above using the IP configuration and without a Host Header.' What should I do to troubleshoot this or is there an obvious configuration error?

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• SQL 2008. I have user in a db which has no login on the server. How is it possible?

  - by Boppity Bop

  I am talking about windows authentication. I dont have access to the server adming rights but a dbadmin sent me screenshot where my user is not in the logins of the server. and also there is only one windows group called admin - databases which I am 100% sure my guy cannot be part of it. BUT... his username is in users of my db... How come user can appear in a db not having login on the server? P.S. in the logs it prints: Login failed for user 'xxxx'. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors

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• Change Active Taskbar Application

  - by MosheK

  I currently have the Buttons on other taskbars set so Never combine So I can have multiple Chrome windows open and will see multiple Chromes on the taskbar. Now the problem is that sometimes I don't really know which one I'm currently looking at. Is there a way to have the active application take on a different color or some other indication that it's the active window. To clarify I don't need the title bar of the application to be a different color, just the "button" that shows up on the taskbar This is for windows 8

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• Can I run virtualized 64-bit Operating Systems if my CPU doesn't support VT-X?

  - by tintinmj

  I have installed VMWare 10.0 workstation on my Compaq CQ60-615DX laptop. The Operating System is Windows 7 Home Premium. When I tried to run Ubuntu 14.04 64-bit in a virtual machine in VMWare I get an error saying: This virtual machine is configured for 64-bit guest operating systems. However, 64-bit operation is not possible. This host does not support Intel VT-x. For more detailed information, see http://vmware.com/info?id=152. So I googled and found that I have to enable Intel VT-x. But I found out that my processor doesn't support Intel® Virtualization Technology (VT-x). So am I doomed and can I never run any virtual OS on my laptop? Or can I run 32-bit OSes?

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• RDP with multiple monitors, display preferences get reset?

  - by Martijn Kooij

  Problem: When I connect to my pc at the office via RDP all the application windows I had previously carefully placed on either monitor 1 or 2 will be "scrambled". Either all applications show on monitor 1 and monitor 2 is empty, or they have switched 1 <- 2. Expected behaviour: When I connect I see all the application windows on exactly the same position and in the exact same size as I left them the night before. I have the exact same monitors at home as I have at work: Primary 2560x1440, Secondary 900x1440. Yesterday I tried switching the physical cables on the host machine hoping that the hardware order of the monitors was the difference. But this morning my secondary monitor was completely blank, not even the taskbar (which I had set to ONLY show on the secondary). Somewhere there must be something to help Windows understand which physical monitor is which virtual RDP monitor is which RDP "server" monitor... Are there more options than switching the cables? This one has been bothering me for a long long time now, I hope someone has a solution or workaround for me. Edit I want to use both monitors, so I have checked the "Use all monitors" setting in the RDP client. For example I leave my mail and total commander on the right monitor, and visual studio and Firefox on the left monitor. When I connect to RDP I want to see those applications on the same positions and sizes.

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• How to forward traffic using iptables rules?

  - by ProbablePattern

  I am new to iptables and I have been doing Google searches for a few days now without finding a good solution to this problem. I have computer A with a public ip address (say 192.0.2.1) that can access the Internet unrestricted. I have another computer B with a private ip address (192.168.1.1) that can only access computer A. How do I use iptables to forward network traffic from B through A to the Internet? I need to use http, ftp, and https in order to use apt-get with sudo. Both computers run Ubuntu linux. I have tried using Squid but I think it is far too complicated for what I need to do.

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• create a bootable usb to automatic repair windows xp system32 files

  - by Edo Post

  Is it possible to create a script/live distro that replaces some system32 files? To explain it a bit more in details: There is a company that has multiple computers (think in 100/1000's) and they all are missing the same system32 files since the company's software removed it. The systems are distributed all over the world and are managed by "normal" people who don't have any knowledge about computers. I want to create a usb stick that i can mail to all those people which contains a script that executes when you boot the usb. this script should replace the missing system32 files without any user input is this possible, and if so how could i manage this?

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• Stop Foxit PhantomPDF Standard from Opening PDFs in Internet Explorer 11

  - by pk.

  Is there a way to stop Foxit PhantomPDF from opening a linked PDF in the browser plugin? My desired behavior is for it to open the PDF in a Foxit PhantomPDF window. I've looked for an add-in, but there is none. Foxit support recommended the following solution -- select File Preferences File Associations Advanced Uncheck Include Browser... Select OK Select Make Default PDF Viewer but it didn't make a difference. How exactly is Internet Explorer making the decision to open it in the browser plugin instead of a separate PhantomPDF window? How can I change that?

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• crontab still sending emails even with > /dev/null

  - by user2344668

  I have a crontab (root) that runs a script and output is set to /dev/null but I always get the emails whenever it runs. I only want to receive error emails. # Rackspace driveclient update (12pm MST) 0 12 * * * /root/scripts/driveclient-update > /dev/null The only way I can get it to turn off is to use /dev/null 2&1 but then I won't get error emails. This is happening on three different CentOS servers, two are 6.3 and one is 6.4. NOTE: I have read over and over that /dev/null is supposed to send stdout there and prevent the email if there is nothing but stdout from the script, so at works for at least some people; I cannot figure out why it is not working on these servers. Here's an example of where /dev/null is supposed to work: http://www.alphadevx.com/a/384-Suppressing-Cron-Job-Email-Notifications

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• How do I display the full title bar in Firefox 29?

  - by ceiling cat

  With Firefox 29, it no longer displays the full title. For example, in this screen shot here, it only display the beginning of "The New York Times - Breaking News, World News & Multimedia". How can I make it display the whole thing? EDIT (for clarification): I'd like to see the full title of the web page of the tab I am on at all times (hovering the cursor would not work for me). Making the tab full width only works if I have 1 or 2 tabs, but most of the time I have many more tabs so this wouldn't work for me.

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• Windows 7 detects DVD, BIOS doesn't [duplicate]

  - by frankie3

  This question already has an answer here: Asus UEFI/BIOS options - How to boot from DVD? 2 answers That's what's happening, my Windows 7 detects the DVD and i can read and burn DVDs and CDs but if I want to boot from DVD in BIOS, DVD doesn't appear. It appears my SSD, my HD, my pendrive... all except DVD :( My motherboard is: http://es.gigabyte.com/products/page/mb/ga-z87x-ud4hrev_10

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• Directory "Bookmarking" in Linux

  - by Jason R. Mick

  Aside from aliasing and links, is there an easy way in Linux to tag commonly used directories and to navigate to a commonly used directory from the terminal. To be clear the disadvantages I see with alternative approaches, and why I want a bookmark/favorites like system: alias Cons: Too specific (every new favorite requires a new alias...although you could in theory make an alias that echo append your dir as a new alias, which would be sort of clever). Can't nest favorites in folders (can't think of a simple solution to this outside of heavy config scripting). links Cons: Clutter directory make ls a headache. pushd/popd Cons: Non-permanent (without shell config file scripting), can't nest favorites in directories, etc. Granted I have multiple ideas for making my own non-standard solution, but before I have at it I wanted to get some perspective on what's out there and if there is nothing, what is a recommended approach. Does anyone know of such a favorites/bookmark-like terminal solution?

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• cd Command Linux and Mystery Flags

  - by Jason R. Mick

  Platform: CentOS 6.2 Shell:tcsh I'm playing around with cd for a BASH script, and noticed the wondrous cd - option, but was left with many questions... Why the cd -? Isn't this redundant with cd ..? EDIT [As FatalError points out, these two commands don't do the same things... so the answer is "no"] Can you delve farther back into your history with - flag, a la in a browser? e.g. When I type cd -, it takes me to my previous directory, but then if I enter that command again, it takes me to the directory I just came from, creating a sort of loop. Is a shorthand for going back multiple levels supported?EDITI realize I can go back with cd .., but was hoping this could be a gateway to a less verbose deep back, e.g. cd -3 vs. cd ../../../ ... hopefully that clarifies what I'm asking....EDIT2As to the current feedback, while .. is a special directory, I don't see a reason why the built-in cd to the terminal couldn't use a shorthand for ../../ ... ../ e.g. cd ..5 or why the built-in also couldn't have a history (a la auto pushd/popd) that could be turned on and used like cd -3. I get that this could be somewhat of security/privacy risk, but I don't see how it's any worst than storing a command history, which most shells/terminals do. The manpage for cd, accessible via man cd and help cd (it's the same for either command), only lists -L and -P flags. However when I type in cd --help it outputs Usage: cd [-plvn][-|<dir>].. Am I right in assuming the other flags and the - (back) option are nonstandard? What are the -n and -v flags for? Both seem to take me back to my home directory, that's all I've been able to figure out via experimentation. A quick read on web resources [1][2] offered just the same sort of info that the man page did and didn't answer my questions. Note: The second Linux-centric resource above claimed cd only had two options (obviously not true in current CentOS) hence my assumption that this functionality could be non-standard.

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• Why is it bad to map network drives in Windows?

  - by Beeblebrox

  There has been some spirited discussion within our IT department about mapping network drives. In particular, it has been said that mapping network drives is A Bad Thing and that adding DFS paths or network shares to your (Windows Explorer/Libraries) Favourites is a far better solution. Why is this the case? Personally I find the convenience of z:\folder to be better than \\server\path\folder', particularly with cmd line and scripting (of course I'm not talking about hard-coded links, naturally!). I have tried searching for pros and cons of mapped network drives, but I haven't seen anything other than 'should the network go down, the drive will be unavailable'. But this is a limitation of any network-accessed storage... I have also been told that mapped network drives poll the network when the network resource is unavailable, however I haven't found more information on this. Wouldn't this still be an issue with other network access mechanisms (that is, mapped Favourites) whenever Windows tries to enumerate the file system (for example, when a file/folder picker dialog is opened)? -- Do network drives poll the network any more than a Windows Explorer library/favourite?

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• Zsh, directory tab-completion with prefix

  - by nifty

  I have a directory where I put all my projects in, let's say it's ~/projects as an example. I've made a command called s which takes one argument, and moves me into that directory. E.g.: s foo moves me to ~/projects/foo. What I'd like is to have a completion command of some sorts, which would act like cd so I could do keep hitting tab to go further into the ~/projects/... directories. Basically, cd with a prefix which is always present. I've looked into zstyle completion in man zshcompsys, but realized I just don't know enough about it to understand it properly.

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• cd ~ dumps me in a seemingly empty directory

  - by Davidos

  This is on a Linux mint box. I'm told everywhere to use the command cd ~ To switch to the root directory before doing some command line magic. For some reason though, it dumps me in a directory named ~ where ls gives nothing and I can't get back to my home directory; I have to restart the terminal session to get out of the empty root directory. I'm positive that everything is just hidden to me, but even as a super-user I can't get the folders to show themselves. I usually just fall back to using a graphical file browser to roam those forbidden files, but I've recently just been shut out of my root directory, and the machine refuses to allow me to change the permissions on the stupid thing even when I type the root password in. It may just be some over-rigorous end-user shielding on the part of the mint team, but it's getting to be really frustrating now.

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• Oracle présente sa solution « in-memory » pour concurrencer SAP et Microsoft, l'option sera disponible avec Oracle Database 12c dans un mois

  Oracle présente sa solution « in-memory » pour concurrencer SAP et Microsoft l'option sera disponible avec Oracle Database 12c dans un moisDans le secteur des bases de données, la tendance est à la course aux performances avec la nouvelle option « in-Memory », un concept qui consiste à mettre en cache les données traitées par les applications plutôt que, par exemple, de faire des appels à un serveur.SAP a été le pionnier des solutions in-memory avec sa solution « SAP in-memory » incluse dans la...

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• Dans quels pays les développeurs sont-ils les mieux payés ? La Suisse en tête du classement, suivie de la Norvège, la France numéro 12

  Dans quels pays les développeurs sont-ils les mieux payés ? La Suisse en tête du classement, suivie de la Norvège, la France numéro 12 En exploitant la base de données de PayScale, une plateforme en ligne qui offre en temps réel des informations utiles sur les rémunérations du marché du travail dans plusieurs pays, Bloomberg offre un classement de 50 pays en fonction du revenu annuel de leurs ingénieurs logiciels. Le classement utilise les données entre mai 2013 et mai 2014.D'après ce classement,...

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