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• How to prevent mod_cluster as single point failure?

  - by Hitesh

  In my configuration i used Apche+mod_cluster as a front_end(load balancer) server and two JBOSS AS 7.1.0 as backend server. In my configuration on one system i have install Apache+mod_cluster + JBOSS AS 7.1.0 and on other system JBOSS AS 7.1.0. Both JBOSS AS 7.1.0 are in domain mode means in clustering. My problem is that if Apche+mod_cluster crash than client can not access any JBOSS AS . I want to configure Apache+mod_cluster in Master_Slave format, means if one of Apache+mod_cluter down another Apache+mod_cluster become active and pass client(browser) request to back-end server in normal form without any interruption. Is there any way to make two Apache+mod_cluster to communicate with each other , means to check health status of each other and if any one get down other Apche+mod_cluster will do it's task ......

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• Kill xserver from command line (init 3/5 does not work)

  - by John Smith

  Hi, I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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• what constitutes out-of-band access to a server?

  - by broiyan

  The first time I access my server with a new installation of Filezilla or Putty, I will get prompted that I should continue only if the RSA key shown to me is correct. The cloud provider has advice on their website that I ought to use their AJAX console to get a key out-of-band with which to compare to the one shown by Filezilla. The AJAX console is launched from a link on the cloud provider's website which requires a login. Exactly how is this AJAX console considered to be out-of-band when it obviously is not a form of physical access to the server?

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• Is there a secure way to add a database troubleshooting page to an application?

  - by Josh Yeager

  My team makes a product (business management software) that our customers install on their own servers. The product uses a SQL database for data storage and app configuration. There have been quite a few cases where something strange happened in the customer's database (caused by bugs in our app and also sometimes admins who mess with the database). To figure out what is wrong with the data, we have to send SQL scripts to the customer and tell them how to run them on the database server. Then, once we know how to fix it, we have to send another script to repair the data. Is there a secure way to add a page in our application that allows an application admin to enter SQL scripts that read and write directly to the database? Our support team could use that to help customers run these scripts, without needing direct access to the SQL server. My big concerns are that someone might abuse this power to get data they shouldn't have and maybe to erase or modify data that they shouldn't be able to modify. I'm not worried about system admins, because they could find another way to do the same thing. But what if someone else got access to the form? Is there any way to do this kind of thing securely?

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• YOUR FREE, EXCLUSIVE, ONLINE UPDATE ON FANTASTIC NEW ORACLE PARTNER OPPORTUNITIES - REGISTER TODAY!

  - by Claudia Costa

  New products. New specializations. New opportunities.There really has never been a better time to be an Oracle partner! Find out exactly what Oracle's "Software. Hardware. Complete" strategy, and the latest developments in the OPN Specialized program, mean for your business.   Register now for the Oracle PartnerNetwork Days Virtual Event on the 29th of June at 11:00h to learn: How to use Oracle's uniquely comprehensive technology stack to grow your business How specialization with Oracle can significantly improve your competitive position How the Oracle PartnerNetwork is evolving to help you succeed Highlights include important updates from Oracle EMEA strategy, partner and product leaders, a live link to the Oracle FY11 Global Partner Kickoff, and interviews with local Oracle partners that are already enjoying the benefits of specialization. The event will also feature: ·         Live Q&A sessions with our speakers, ·         Virtual information booths packed with useful information ·         Opportunities to network with Oracle experts and your peers. ·         Special guest speaker is a former Microsoft executive who has used the principles of specialization with spectacular results to become one of the world's most successful social entrepreneurs. Plus, at the end of the event, you can submit your feedback form for your chance to win two passes to Oracle OpenWorld in San Francisco this September! CLICK HERE TO REGISTER NOW!

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• Diffing file contents

  - by PHeiberg

  I have two plain text files, each file is containing a list of strings sorted alphabetically with one string per line. I want to diff the files and have an output of all strings that exist only in file2. Preferabbly I want the operation to be possible without any 3rd party tools, or with a minimum of installations of tools that is "normal" to find in a windows command line environment, such as GNU Diffutils, Powershell, etc. The output should be in text form (file or as command line output). Example: File 1 contents: A C D File 2 contents: A B C E Result wanted: B E

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• Error message when running "make" command: /usr/bin/ld: i386 architecture of input file is incompatible with i386:x86-64 output

  - by user784637

  I am unable to create a working executable file by running the make command in a tree previously built on an i386 machine. I'm getting an error message in the form of me@me-desktop:~$ make /usr/bin/ld: i386 architecture of input file `../.. /Lib/libProgram.a(something.o)' is incompatible with i386:x86-64 output I've been told and reassured that this program has been tested and successfully compiled on 64-bit Fedora. I'm running a 64-bit machine me@me-desktop:~$ uname -m x86_64 I'm running Ubuntu 10.04 me@me-desktop:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 10.04.3 LTS Release: 10.04 Codename: lucid I'm using g++ # me@me-desktop:~$ g++ --version g++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3 Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. I'm also using libtool # me@me-desktop:~$ libtool --version ltmain.sh (GNU libtool) 2.2.6b Written by Gordon Matzigkeit <[email protected]>, 1996 Any clues as to what is going wrong?

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• Website: Requested filename being rewritten

  - by horatio

  I have been unable to find an answer via search. I have a website (I do not administer the servers) where the server will serve a different file than the one requested. I first noticed this when using a filename of the following form: _foo.php (single underscore) If I request foo.php (does not exist), the server returns _foo.php. By "returns" I mean that the server decides I meant _foo.php, processes the php file, and serves the output. If I request afoo.php, zfoo.php, or even __foo.php (two underscores) (these files do not exist) the server returns _foo.php. If I request aafoo.php, the server returns 404. To sum up: the server seems to be doing a partial filename match. My question is: what is happening and is this accepted behavior for a web server (or standard behavior of a common mod/package/etc)?

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• Using wget to recursively download whole FTP directories

  - by user9406

  I want to copy all of the files and folders from one host to another. The files on the old host sit at /var/www/html and I only have FTP access to that server, and I can't TAR all the files. Regular connection to the old host through FTP brings me to the /home/admin folder. I tried running the following command form my new server: wget -r ftp://username:[email protected] But all I get is a made up index.html file. What the right syntax for using wget recursively over FTP?

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• C# Simple Twitter Update

  - by mroberts

  For what it's worth a simple twitter update. using System; using System.IO; using System.Net; using System.Text; namespace Server.Actions { public class TwitterUpdate { public string Body { get; set; } public string Login { get; set; } public string Password { get; set; } public override void Execute() { try { //encode user name and password string creds = Convert.ToBase64String(Encoding.ASCII.GetBytes(string.Format("{0}:{1}", this.Login, this.Password))); //encode tweet byte[] tweet = Encoding.ASCII.GetBytes("status=" + this.Body); //setup request HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://twitter.com/statuses/update.xml"); request.Method = "POST"; request.ServicePoint.Expect100Continue = false; request.Headers.Add("Authorization", string.Format("Basic {0}", creds)); request.ContentType = "application/x-www-form-urlencoded"; request.ContentLength = tweet.Length; //write to stream Stream reqStream = request.GetRequestStream(); reqStream.Write(tweet, 0, tweet.Length); reqStream.Close(); //check response HttpWebResponse response = (HttpWebResponse)request.GetResponse(); //... } catch (Exception e) { //... } } } }

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• Upgrading from php 5.3 to php 5.4 with Macport

  - by dr.stonyhills

  PHP5.4 has been available for sometime now and Macport recently caught up with the release of port php54 but the process of upgrading is not as clear as possible. Even worst for those who are new to maintaining multiple versions of PHP on the same machine. I am keen on trying out some of the new features in PHP5.4 like traits, new array form etc but falling back on to php5.3 for other compatibility stuff. So i sudo port install php5+ (all the variants, apache2 etc) Then i tell it what PHP port to use as default sudo port select --set php php54 Check what version of PHP is active in the terminal using php -v outputs php 5.4.3. But i seem to be having issues with choosing the right non cli version as in the version of the module run by apache etc is still php5.3.12. Do i have to change the reference to the libphp5 in apache httpd.conf? Any advice on the right workflow for switching between php version on macport greatly appreciated!

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• X11 for apache user

  - by fuenfundachtzig

  We are using inkscape to convert SVG images uploaded to our server via a web form. For this inkscape offers a batch mode via the -z option, but this batch mode has a flaw: When inkscape is run by the apache user, it breaks saying $ inkscape -z -W drawing.svg X11 connection rejected because of wrong authentication. The application 'inkscape' lost its connection to the display localhost:11.0; most likely the X server was shut down or you killed/destroyed the application. If you do the same as a normal user you also get errors: Xlib: connection to "localhost:11.0" refused by server Xlib: PuTTY X11 proxy: MIT-MAGIC-COOKIE-1 data did not match (inkscape:24050): Gdk-CRITICAL **: gdk_display_list_devices: assertion `GDK_IS_DISPLAY (display)' failed 301.27942 But at least inkscape gives the correct answer (here the number stating the width of the image). Does somebody know how to make this also work for the apache user? Does it make sense to authorize apache to use X (if so how)? In any case it doesn't feel like the right solution...

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• Excel 2007 Save as PDF with pagesize/pagewidth auto or not breaking Excel lines.

  - by mxg

  Hi everyone! I tried to export an Excel file into PDF, but it looks horrible. I need at least that one row form Excel to be saved into a one row in PDF. I know that it is not so simple, because Excel does no have any page size. At least, they could make some estimations. Can anyone recommend me how to save in MS Office an excel file into PDF, to have a normal look? Thanks in Advance!

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• Rules to choose hardware for OLTP systems (sql server)

  - by Roman Pokrovskij

  Ok. We know database size, number of concurrent users, number of transactions per minute; should choose number of processors, RAID, RAM, mirroring and clustering. There are no exact rule.. but may be there are no rules at all? In my practice in every case I have "legacy" system, and after some inspections and interview I can form an opinion how hardware and design can be improved. But every time when I meet "absolutely" new system (I guess there are no new systems, but sometimes are such tasks) I can't say anything trustful. So I'm interesting how people deal with such tasks? They map task on theirs experience or have some base formulas?

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• New website - best practice for requirements specs? [closed]

  - by Alex K.

  Possible Duplicate: Extracting user requirements from a person who does not know how to express himself As a hobby freelancer I'm new to this. I've never had a non-technical client before explain to me what his future website is supposed to do. A person wants me to make a website for him and he basically explained to me what's it about. However, he's not a technical person and he just doesn't understand what I need to know and how to properly describe/explain it to me. When I ask him how a user is supposed to submit an entry to the website he told me "He fills out a form.", which is not really helping me. This was just an example, it goes on for other sections of the website as well which are a lot harder to explain. The website will be aimed at a specific professional user demographic and I have no clue about their profession and how their industry works. I tried to find some good Product Requirements Document templates on Google but none of them really seemed like they could help him understand how to write it so I can understand what he wants/needs. Can somebody please give me a hint on how to deal with such non-technical clients?

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• Accessing local files through an http:// address

  - by RexE

  I would like to access a folder of mp3 files on my local Windows machine through http:// addresses. For example, typing http://localhost:9999/songs/test.mp3 into my browser would play test.mp3, which sits in a specified folder on my C: drive. What is the very simplest way to do this? (Background: a program I'm using wants me to enter the URLs of these files, but assumes they are remote and accessed over http. It doesn't accept URLs of the form file://C/Users.... So, I'd like to give these local files addresses that makes them "look" remote.)

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• The best way to learn how to extend Orchard

  - by Bertrand Le Roy

  We do have tutorials on the Orchard site, but we can't cover all topics, and recently I've found myself more and more responding to forum questions by pointing people to an existing module that was solving a similar problem to the one the question was about. I really like this way of learning by example and from the expertise of others. This is one of the reasons why we decided that modules would by default come in source code form that we compile dynamically. it makes them easy to understand and easier to modify for your own purposes. Hackability FTW! But how do you crack open a module and look at what's inside? You can do it in two different ways. First, you can just install the module from the gallery, directly from your Orchard instance's admin panel. Once you've done that, you can just look into your Modules directory under the web site. There is now a subfolder with the name of the new module that contains a csproj that you can open in Visual Studio or add to your Orchard solution. Second, you can simply download the package (it's NuGet) and rename it to a .zip extension. NuGet being based on Zip, this will open just fine in Windows Explorer: What you want to dig into is the Content/Modules/[NameOfTheModule] folder, which is where the actual code is. Thanks to Jason Gaylord for the idea for this post.

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• My datacenter is unable to add PTR/rDNS record, then how can I prevent the mail outgoing from going to spam folder?

  - by gilzero

  I am having problem that mail sent out from my server all goes to recipient's spam folder. I am running Drupal sites on Linux server. CentOS w/ cPanel. Our users cannot receive email as the mail went to the spam folder. (such as registration email, contact form email) I was advised that I need to have PTR/rDNS record added for my host. I then contact my datacenter to add PTR/rDNS thing, unfortunately, the datacenter said they are unable to do it. So what can I do? Any other ways I can fix the problem? Thank you!

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• ArchBeat Link-o-Rama for 2012-09-12

  - by Bob Rhubart

  15 Lessons from 15 Years as a Software Architect | Ingo Rammer In this presentation from the GOTO Conference in Copenhagen, Ingo Rammer shares 15 tips regarding people, complexity and technology that he learned doing software architecture for 15 years. Adding a runtime picker to a taskflow parameter in WebCenter | Yannick Ongena Oracle ACE Yannick Ongena shows how to create an Oracle WebCenter popup to allow users to "select items or do more complex things." Oracle Identity Manager 11g R2 Catalog | Daniel Gralewski Oracle Fusion Middleware A-Team blogger Daniel Gralewski shares a detailed overview of the new Catalog feature, one of the most talked about features in the latest release of Oracle Identity Manager 11g. Cloud API and service designers, stop thinking small | Cloud Computing - InfoWorld "The focus must shift away from fine-grained APIs that provide some type of primitive service, such as pushing data to a block of storage or perhaps making a request to a cloud-rooted database," says InfoWorld's David Linthicum. "To go beyond primitives, you must understand how these services should be used in a much larger architectural context. In other words, you need to understand how businesses will employ these services to form real workplace solutions -- inside and outside the enterprise." Oracle Solaris 8 P2V with Oracle database 10.2 and ASM | Orgad Kimchi Orgad Kimchi's technical post illustrates the migration of "a Solaris 8 physical system, with Oracle database version 10.2.0.5 with ASM file-system located on a SAN storage, into a Solaris 8 branded zone inside a Solaris 10 guest domain on top of a Solaris 11 control domain." Thought for the Day "The hardest single part of building a software system is deciding precisely what to build. " — Fred Brooks Source: SoftwareQuotes.com

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• Problems with mailenable when sending to yahoo

  - by Naresh

  I m testing sending emails from mailenable webmail. I have no problems sending mail to gmail or hotmail, both work fine, but yahoo mail shows the attachment icon for the message even though the message doesn't contain any attachments, it's just plain text. It only includes a reply to a previous message, like this: message text ----- Original Message ----- original message text I copied the message content and sent it from gmail to yahoo and the attachment icon didn't show which makes me believe it's something with mailenable. What could possibly be wrong? Also, is there a white list for yahoo mail that I can join? And also for other popular webmail? I'm going to use this on a production website (site visitors use the contact us form to send messages to the site - the mail enable server running on the same machine as the web server - then I check the messages using the mailenable webmail and reply them). This is really important to me, your help would be really appreciated ...

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• Identity Management: The New Olympic Sport

  - by Naresh Persaud

  How Virgin Media Lit Up the London Tube for the Olympics with Oracle If you are at Open World and have an interest in Identity Management, this promises to be an exciting session. Wed, October 3rd Session CON3957: Delivering Secure Wi-Fi on the Tube as an Olympics Legacy from London 2012 Session Time: 11:45am-12:45pm Session Location: Moscone West L3, Room 3003 Speakers: Perry Banton - IT Architect, Virgin Media                    Ben Bulpett - Director, aurionPro SENA In this session, Virgin Media, the U.K.'s first combined provider of broadband, TV, mobile, and home phone services, shares how it is providing free secure Wi-Fi services to the London Underground, using Oracle Virtual Directory and Oracle Entitlements Server, leveraging back-end legacy systems that were never designed to be externalized. As an Olympics 2012 legacy, the Oracle architecture will form a platform to be consumed by other Virgin Media services such as video on demand. Click here for more information.

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• Writing Acceptance test cases

  - by HH_

  We are integrating a testing process in our SCRUM process. My new role is to write acceptance tests of our web applications in order to automate them later. I have read a lot about how tests cases should be written, but none gave me practical advices to write test cases for complex web applications, and instead they threw conflicting principles that I found hard to apply: Test cases should be short: Take the example of a CMS. Short test cases are easy to maintain and to identify the inputs and outputs. But what if I want to test a long series of operations (eg. adding a document, sending a notification to another user, the other user replies, the document changes state, the user gets a notice). It rather seems to me that test cases should represent complete scenarios. But I can see how this will produce overtly complex test documents. Tests should identify inputs and outputs:: What if I have a long form with many interacting fields, with different behaviors. Do I write one test for everything, or one for each? Test cases should be independent: But how can I apply that if testing the upload operation requires that the connect operation is successful? And how does it apply to writing test cases? Should I write a test for each operation, but each test declares its dependencies, or should I rewrite the whole scenario for each test? Test cases should be lightly-documented: This principles is specific to Agile projects. So do you have any advice on how to implement this principle? Although I thought that writing acceptance test cases was going to be simple, I found myself overwhelmed by every decision I had to make (FYI: I am a developer and not a professional tester). So my main question is: What steps or advices do you have in order to write maintainable acceptance test cases for complex applications. Thank you.

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• Recommending simple appliance for DansGuardian, iptables, snort inline

  - by SRobertJames

  I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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• Algorithmic problem - quickly finding all #'s where value %x is some given value

  - by Steve B.

  Problem I'm trying to solve, apologies in advance for the length: Given a large number of stored records, each with a unique (String) field S. I'd like to be able to find through an indexed query all records where Hash(S) % N == K for any arbitrary N, K (e.g. given a million strings, find all strings where HashCode(s) % 17 = 5. Is there some way of memoizing this so that we can quickly answer any question of this form without doing the % on every value? The motivation for this is a system of N distributed nodes, where each record has to be assigned to at least one node. The nodes are numbered 0 - (K-1) , and each node has to load up all of the records that match it's number: If we have 3 nodes Node 0 loads all records where Hash % 3 ==0 Node 1 loads all records where Hash % 3 ==1 Node 2 loads all records where Hash % 3 ==2 adding a 4th node, obviously all the assignments have to be recomputed - Node 0 loads all records where Hash % 4 ==0 ... etc I'd like to easily find these records through an indexed query without having to compute the mod individually. The best I've been able to come up with so far: If we take the prime factors of N (p1 * p2 * ... ) if N % M == I then p % M == I % p for all of N's prime factors e.g. 10 nodes : N % 10 == 6 then N % 2 = 0 == 6 %2 N % 5 = 1 == 6 %5 so storing an array of the "%" of N for the first "reasonable" number of primes for my data set should be helpful. For example in the above example we store the hash and the primes HASH PRIMES (array of %2, %3, %5, %7, ... ]) 16 [0 1 1 2 .. ] so looking for N%10 == 6 is equivalent to looking for all values where array[1]==1 and array[2] == 1. However, this breaks at the first prime larger than the highest number I'm storing in the factor table. Is there a better way?

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• c# vocabulary

  - by foxjazz

  I have probably seen and used the word Encapsulation 4 times in my 20 years of programming.I now know what it is again, after an interview for a c# job. Even though I have used the public, private, and protected key words in classes for as long as c# was invented. I can sill remember coming across the string.IndexOf function and thinking, why didn't they call it IndexAt.Now with all the new items like Lambda and Rx, Linq, map and pmap etc, etc. I think the more choices there is to do 1 or 2 things 10 or 15 differing ways, the more programmers think to stay with what works and try and leverage the new stuff only when it really becomes beneficial.For many, the new stuff is harder to read, because programmers aren't use to seeing declarative notation.I mean I have probably used yield break, twice in my project where it may have been possible to use it many more times. Or the using statement ( not the declaration of namespace references) but inline using. I never really saw a big advantage to this, other than confusion. It is another form of local encapsulation (oh there 5 times used in my programming career) but who's counting?  THE COMPUTERS ARE COUNTING!In business logic most programming is about displaying lists, selecting items in a list, and sending those choices to some other system or database to keep track of those selections. What makes this difficult is how these items relate to one, each other, and two externally listed items.Well I probably need to go back to school and learn c# certification so I can say I am an expert in c#. Apparently using all aspects of c# (even unsafe code) in my programming life, doesn't make me certified, just certifiable.This is a good time to sign off:Fox-jazzy

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