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Articles indexed in June 2011

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• Industry Standard DNS & Authentication?

  - by James Murphy

  I'm just curious as to what is considered industry standard when it comes to doing DNS and authentication on an environment with mainly linux machines? Do people use Windows DNS & Windows AD to do it all if they have at least one windows server (well - alot might, but should they)? Does ANYONE use hosts files or local only user accounts on each server? What would people like Facebook/Google use for their DNS and authentication on their servers? We have an environment where we have about 10-15 linux servers and 1-2 windows servers. We are currently using Windows AD and Windows DNS but it doesn't seem like it's the most secure/stable/scalable way to do it for a mainly linux environment? We use RHEL as our linux environment.

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• Open Source Visualization and Dashboard Software

  - by helios

  I am working on an open source Application Performance Monitoring (APM) software and looking for a visualization tool with dashboard capabilities. I came across Graphite which looks pretty good but wondering if there is anything better out there before I settle down with that tool. Here's the list of features I am interested in: Must-Have Open Source license API to submit real time data Web-based visualization interface Persistence - file or database Nice-To-Have Dashboard Capabilities: Allow users to select a few metrics (CPU, Heap Usage, # of Active Users etc.) and place them on a single page for easier monitoring. Any suggestions?

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• Best VoIP VPS Location?

  - by ToiletOverflow

  Our office currently runs a few phones over a VoIP line. Through our VoIP provider, we have a virtual private server. We chose them as the VPS provider because the VPS came pre-loaded with all of the software that was necessary. However, I've discovered that I would rather manage the software myself and would prefer to work on a different platform. The primary reason that we have stayed with them is because as our VoIP provider, I presume that there is some advantage in call quality because they have "direct access to the PSTN", which I would presume is an advantage when it comes to call termination and overall call quality. My question boils down to: What is better from a call quality perspective? 1) A server located 20ms closer to us (60ms), offered by a different company. 2) The current server at the VoIP/SIP provider (80ms)

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• Nginx traffic is going to wrong upsteam when mixing named servers and default servers

  - by Morgan

  I have the below config file for nginx. The problem is all traffic is going to upstream clustera. How do I configure nginx to only send traffic for example.com to clustera and all the rest to clusterb? user www-data; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; log_format cache '\n*** $remote_addr [$time_local] ' '[$upstream_cache_status] $upstream_response_time ' '$host "$request" ($status) $body_bytes_sent ' '"$http_referer" "$http_user_agent" ' 'Cache-Control: $upstream_http_cache_control ' 'Expires: $upstream_http_expires ' ; access_log /var/log/nginx/access.log cache; sendfile on; keepalive_timeout 65; gzip on; gzip_vary on; gzip_comp_level 6; gzip_proxied any; gzip_disable "MSIE [1-6]\.(?!.*SV1)"; gzip_buffers 16 8k; include /etc/nginx/conf.d/*.conf; proxy_cache_key "$scheme$host$request_uri"; proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=main:10m max_size=1g inactive=30m; upstream clustera { ip_hash; server a.example.com:80; } upstream clusterb { ip_hash; server b.example.com:80; } client_max_body_size 20m; client_body_buffer_size 128k; proxy_connect_timeout 300; proxy_send_timeout 300; proxy_read_timeout 300; # host for example.com should send traffic to clustera server { listen 80; server_name example.com; location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clustera; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } # host for everyone else. traffic goes to clusterb server { listen 80; server_name _; if ( $http_user_agent ~* (spider|crawler|slurp) ) { return 503; } set $slow 0; if ( $http_user_agent ~* (bot) ) { set $slow 1; } if ( $slow ) { set $limit_rate 1k; } location ~*(png|jpeg|jpg|gif|ico|css|js)$ { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location /images { proxy_pass http://clisterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_cache main; proxy_cache_valid 200 5m; proxy_cache_valid 302 1m; } location / { proxy_pass http://clusterb; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } }

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• Windows server 2008R2 routing with single NIC

  - by Fabian

  I'm trying to duplicate a Linux server configuration to a windows server 2008R2 box. Basicaly this linux server acts as a router, but it is doing its job with only 1 interface (1 NIC). Here is the network configuration in place (I cannot change it) : INTERNET <== Router (local ip = 194.168.0.3) <== linux Server (ip : 194.168.0.2). The router is configured with a DMZ to 194.168.0.2, and only allow this IP to connect to internet (Cannot change this router configuration). The linux server is configured with a default gateway to 194.168.0.3, with the option : "Act as router". All other computer on the lan have this configuration (given by DHCP) : IP range : 194.168.0.X MASK : 255.255.255.0 Default gateway : 194.168.0.2 And everything is working perfectly. I'm trying to reproduce this way of routing with only one NIC from a windows server 2008R2, but it seems that you cannnot do it with only one NIC (all exemples I see are refering to 2 NIC with 2 different network). Does someone have an idea how to achieved this in Windows server 2008R2 ? Tx you for your help ! Fabian.

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• How to auto detect text file encoding?

  - by ???

  There are many plain text files which were encoded in variant charsets. I want to convert them all to UTF-8, but before running iconv, I need to know its original encoding. Most browsers have an Auto Detect option in encodings, however, I can't check those text files one by one because there are too many. Only having known the original encoding, I then can convert the texts by iconv -f DETECTED_CHARSET -t utf-8. Is there any utility to detect the encoding of plain text files? It doesn't have to be a 100% perfect correct, but it should recognize most of them.

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• Understanding RAM usage on Linux

  - by stebbo

  I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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• Radeon 6950 - Garbling of text and graphics in certain Windows only

  - by Greg

  This morning I noticed the text in Gmail (in Firefox 4) looked a little funny (kind of thin, maybe some color fringing). I went to work and thought it might be some ClearType issue or something with the way Direct way that FF4 draws to the screen. When I came back from work (I left the computer on), the problem was much worse - way beyond ClearType nit-picking. The text was barely readable. I opened Chrome and there was no such problem. It seems like only Windows that use hardware acceleration are garbled, and ones that use GDI are not. But, I fired up Dragon Age and didn't notice any problems (I only really looked at the main menu though). Here is a link to a screen shot that illustrates the problem. Notice how the Windows Live Mesh window is completely unreadable, the text in Firefox 4 (left) is pretty bad, while Chrome, the Windows Control Panel, and the task bar are perfectly fine. The fact that the problem shows up in screen shots and that it only happens in certain Windows makes me confident that the problem cannot be with the monitor or DVI cable. I am using the AMD Radeon drivers from 4/27/11. The card I have (MSI Frozr II) came with a slight overclock (810Mhz) out of the box, but it looks like when I'm on the Windows desktop it's not running at full clock (CCC reports 450Mhz). Still, I underclocked it to the stock reference clock (800Mhz) and it made no difference. The idle temperature according to Afterburner is 42-44 Celsius, which seems a tad high but not enough to cause a problem - it's cold to the touch if I open up the machine. What the heck could be causing this? The problem varies in intensity. As we speak I'm in Firefox and things look better than they did earlier - it'll probably get worse again soon. Radeon 6950 (MSI Frozr II), Seasonic X 560, Core i5 2500K at stock clockspeeds, 16GB RAM, Asus P8P67 M Pro

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• How do I stop track changes from turning on automatically in Word 2007

  - by Benj

  Whenever I open an existing document in Word 2007 (on Windows XP), word turns on track changes, and changes the display mode to "Final" (that is, not "Final Showing Markup" -- so I often don't even notice track changes is on if I don't remember to pay attention. This happens for ALL existing documents, and doesn't happen for new documents. I can't find any option in the configuration that would control this behavior. I would like to restore the original/default behavior where documents are opening with Track Changes off, and in "Final showing markup" display. Steps to Reproduce Open Word 2007. Create a new document. Verify that track changes is off. Save the document and close Word. Open the document (either directly or through Word). Track changes is now on. Any ideas?

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• Truecrypt rescue usb

  - by geekbutitsokk

  i have found tutorials on their official forum and on the internet about how to make a truecrypt rescue bootable usb stick. I'm guessing anyone who can answer will know what that is already, but it is basically just a way to boot into the system using a usb stick instead of a DVD. But the only problem is all of these tutorials involve using Grub4Dos, and i cannot run Grub4Dos on 64 bit windows 7. Is there any other alternative method? Thanks!

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• what does STOP service do in Windows?

  - by Radek

  I start my web server as web service on Windows XP. How it was done is described here My web server is coded in ruby/sinatra and I start it in .bat file. That file is used by the service too. Manually I stop the web server by pressing CTRL+C in the dos window. How can I stop the server now as it started via service? I found out that I can stop it via taskkill /f /t /im ruby.exe Is there any way I can use the MMC stop service function to stop the web server? runweb.bat c: cd C:\web ruby C:\web\web2.rb

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• How do you get an add-on to run in Firefox 4?

  - by efficiencyIsBliss

  I have an add-on called Flash-Aid in Firefox 4 on my Ubuntu build, but ever since Mozilla came up with their new UI, I haven't been able to figure out how to get add-ons to actually run within Firefox. Double clicking them just opens up a detail page about them and there are no options to run them. With most add-ons, this isn't a problem since they usually don't need to be explicitly run, but this one does. Can someone tell me how to do this?

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• How do I allow programs that generate "high" or "severe" alerts in MS Security Essentials?

  - by Alex O

  Microsoft Security Essentials seems to allow only quarantine or delete actions for program that it deems to have "high" or "severe" risk. However, it also assigns these levels to what it considers to be "hacking tools". Is there a way to override this nanny behaviour and force programs on the allowed list? Thank you. EDIT: Here's a screenshot showing the lack of an "Allow" option in the drop-down list: http://img820.imageshack.us/img820/3870/msse.png

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• How can I know which key of Windows Vista corresponds to the upgrade key of Windows 7

  - by js_

  I have two Dell PCs. And each PC has a Windows Vista disc and a Windows 7 upgrade disc which Dell gave me for free. And each disc has a product key. There are 4 product keys in total. I'm going to sell one of the Dell PCs. But unfortunately I don't know which product key of Windows 7 corresponds to which product key of Windows Vista. If I sell the PC with wrong combination of a Windows Vista and a Windows 7, error will occur and I will get in trouble. How can I know which Windows 7 corresponds to which Windows Vista?

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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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• Can I turn a 2D image into something like a ribbon without 3D Tools?

  - by Michael Stum

  I have a picture that's very long and not very tall. I want to create a graphic like the one below, but with my picture as the "texture". Can Photoshop do something like that? I'd like to avoid to spin up a 3D Program because then I need to render it, get the image out of it and into Photoshop. They seem to have added 3D Functionality into CS5, I just never looked at it. Obvious question after that: What would the backside look like? Are there other applications that can do something like that in a simple way?

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• System recognizes admin password on the Welcome screen but not when elevating

  - by Lee C.

  I set up Windows 7 with a couple of standard accounts, and an administrator account (called Odin). I can log in to Odin just fine from the Welcome screen. While logged into Odin I can do anything that requires administrator privileges without a password: just hit Yes in the User Account Control dialog. If I am logged into one of the other accounts and I do something that requires elevation (e.g. most installers, and some control panel functionality), then Windows presents me with a User Account Control dialog asking "Do you want to allow the following program to make changes to this computer? To continue, type an administrator password, and then click Yes." The account shown in this dialog is Odin, so I enter Odin's password. But Windows redisplays the dialog with the message "Logon failure: unknown user name or bad password." This always happens, and has done so for many months, probably since I first got the computer. Why does Odin's password work from the Welcome screen, but not when elevating? Please note that I am not asking how to recover Odin's password. I remember the password I originally set for Odin, and it works as it should from the Welcome screen, but is not recognized when elevating. The password has no funny characters, just letters and digits. Thanks!

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• Logitech keboard wrong keys under MAC OSX

  - by David Casillas

  I have a Logitech MK250 keyboard I use with my Macbook. One day the "minor/mayor than" and the "back slash" keys flip their functionality, so I have to hit "backslash" to get a "minor than" symbol and press the "alt + minor than" key to get the "backslash". Is there any way to reverse this annoying behavior? I often switch to Windows, where the keys work the expected way, and I'm always missing the right key.

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• Comment gérer les différentes versions de Perl (ActivePerl) ? Partagez vos retours d'expérience

  Bonjour, Je lance ce débat pour parler d'ActivePerl. En fait, il y a quelques années, il n' y avait que la version 5.8 (pour ne pas parler de la 5.6) qui évoluée régulièrement. Pendant ce temps, le développement de la 5.10 suivait son cours. Puis, nous nous sommes retrouvés avec 2 versions en évolutions. Il a fallu quelques mois pour espérer avoir nos sympathiques modules Perl du CPAN compatibles sur les deux versions. Maintenant la politique d'ActivePerl est de proposer une version stable chaque année. C'est intéressant car Perl est très maintenu et évolue bien, mais sincèrement, on se retrouve avec x versions de Perl et on s'y perd. Actuellement, il y a 4 versions d'ActivePerl 5.8, 5.10, 5.12 et 5.14, et je ne parle pas de Perl6, Parro...

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• Développer des fonctions scalaires (UDF) avec PLpgSQL, par SQLpro

  Bonjour, voici le premier d'une nouvelle série d'articles consacrés au développement des fonctions sous PLpgSQL Ce premier article est consacré aux fonctions scalaires appelées dans la norme SQL "UDF" pour User Defined Function Il sera suivi dans les mois prochains de deux autres articles : l'un sur les fonctions de manipulation des tables et l'autre sur les fonctions Sommaire : 0 - INTRODUCTION 1 - CRÉATION D'UNE FONCTION SCALAIRE 2 - UTILISATION DE LA FONCTION 3 - FONCTION AVEC LANGAGE SQL 4 - QUELQUES MOTS CLEFS DE PL/pgSQL 5 - ARGUMENTS 6 - VARIABLES ET CONSTANTES 7 - POLYMORPHISME 8 - STRUCTURES DE TEST ET BRANCHEMENTS 9 - GESTION D'ERRE...

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• Google Chrome sur le point d'intégrer le framework WebRTC soutenu par la fondation Mozilla, une sérieuse menace pour Skype ?

  Google Chrome sur le point d'intégrer le framework WebRTC Soutenu par la fondation Mozilla, une sérieuse menace pour Microsoft Skype ? Mise à jour du 23/06/2011 Google Chrome est sur le point d'avoir des capacités de communication audio et vidéo en natif qui pourraient permettre à n'importe quelle application Web de rivaliser avec Skype, le célèbre logiciel de VoIP, propriété de Microsoft désormais. Ces nouvelles fonctionnalités seront fondées sur le framework Web...

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• SQL SERVER – BI Quiz Hint – Performance Tuning Cubes – Hints

  - by pinaldave

  I earlier wrote about SQL BI Quiz over here and here. The details of the quiz is here: Working with huge data is very common when it is about Data Warehousing. It is necessary to create Cubes on the data to make it meaningful and consumable. There are cases when retrieving the data from cube takes lots of the time. Let us assume that your cube is returning you data very quickly. Suddenly on one day it is returning the data very slowly. What are the three things will you to diagnose this. After diagnose what you will do to resolve performance issue. Participate in my question over here I required BI Expert Jason Thomas to help with few hints to blog readers. He is one of the leading SSAS expert and writes a complicated subject in simple words. If queries were executing properly before but now take a long time to return the data, it means that there has been a change in the environment in which it is running. Some possible changes are listed below:-  1) Data factors:- Compare the data size then and now. Increase in data can result in different execution times. Poorly written queries as well as poor design will not start showing issues till the data grows. How to find it out? (Ans : SQL Server profiler and Perfmon Counters can be used for identifying the issues and performance  tuning the MDX queries)  2) Internal Factors:- Is some slow MDX query / multiple mdx queries running at the same time, which was not running when you had tested it before? Is there any locking happening due to proactive caching or processing operations? Are the measure group caches being cleared by processing operations? (Ans : Again, profiler and perfmon counters will help in finding it out. Load testing can be done using AS Performance Workbench (http://asperfwb.codeplex.com/) by running multiple queries at once)  3) External factors:- Is some other application competing for the same resources?  HINT : Read “Identifying and Resolving MDX Query Performance Bottlenecks in SQL Server 2005 Analysis Services” (http://sqlcat.com/whitepapers/archive/2007/12/16/identifying-and-resolving-mdx-query-performance-bottlenecks-in-sql-server-2005-analysis-services.aspx) Well, these are great tips. Now win big prizes by participate in my question over here. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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• Multi Level Security via Roles

  - by Geertjan

  I'm simulating a small scenario: Users can be dragged into roles; roles can be dragged into role groups. When a drop is made into a role group, a new role is created (WindowManager.getDefault().setRole("")). Then, when the user logs in, they log into a particular role. Depending on the role they log into, a different role group is assigned, which maps to a certain "role" in NetBeans Platform terms, i.e., the related level of security is applied and the related windows open.

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• No Downtime Siebel Migration with Oracle GoldenGate iDemo Recording

  - by user491905

  Hi everyone,Thank you very much for attending today's OGG Siebel Migration iDemo.Here is the recording link for today's iDemo session:No Downtime Siebel Migration with Oracle GoldenGate24 June 2011, 2:01 pm Sydney Time  , 53 minshttps://oracleevents.webex.com/oracleevents/lsr.php?AT=pb&SP=EC&rID=62965277&rKey=928dbcbb49cafc64In the near future, I'll put all recording links, presentations, and iDemo On Demand demos in a list so it'll be easier for you to access.

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• LDAP ACI Debugging

  - by user13332755

  If you've ever wondered which ACI in LDAP is used for a special ADD/DELETE/MODIFY/SEARCH request you need to enable ACI debugging to get details about this. Edit/Modify dse.ldifnsslapd-infolog-area: 128nsslapd-infolog-level: 1ACI Logging will be placed at 'errors' file, looks like: [22/Jun/2011:15:25:08 +0200] - INFORMATION - NSACLPlugin - conn=-1 op=-1 msgId=-1 -  Num of ALLOW Handles:15, DENY handles:0 [22/Jun/2011:15:25:08 +0200] - INFORMATION - NSACLPlugin - conn=-1 op=-1 msgId=-1 -  Processed attr:nswmExtendedUserPrefs for entry:uid=mparis,ou=people,o=vmdomain.tld,o=isp [22/Jun/2011:15:25:08 +0200] - INFORMATION - NSACLPlugin - conn=-1 op=-1 msgId=-1 -  Evaluating ALLOW aci index:33 [22/Jun/2011:15:25:08 +0200] - INFORMATION - NSACLPlugin - conn=-1 op=-1 msgId=-1 -  ALLOW:Found READ ALLOW in cache [22/Jun/2011:15:25:08 +0200] - INFORMATION - NSACLPlugin - conn=-1 op=-1 msgId=-1 -  acl_summary(main): access_allowed(read) on entry/attr(uid=mparis,ou=people,o=vmdomain.tld,o=isp, nswmExtendedUserPrefs) to (uid=msg-admin-redzone.vmdomain.tld-20100927093314,ou=people,o=vmdomain.tld,o=isp) (not proxied) (reason: result cached allow , deciding_aci  "DA anonymous access rights", index 33)

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