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• Which are the most important directories to backup on a Linux server?

  - by QAH

  Hello everyone! I'm running an Ubuntu 9.10 Linux server. I'm trying to find a way to backup the machine while it is running and from what I see, this eliminates the disk clone utilities. All of the disk clone stuff I have seen for Linux requires that you reboot into a special live CD. So my question is this, what is the best solution for backing up the system while it is running? Also, I don't really care about the OS config too much, I just want to be able to keep my stored files and my programs that I have installed on it. Thanks

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• AD Users outside the building

  - by gammaRED

  I've never had a customer ask me this, but they keep insisting if they have Active Directory and a Domain, that mobile[road warriors] users will not be able to login to their laptops if they are at home or away from the office. I told them that is would use "cache" creds to do this. Am I right or wrong? I've been told this and found a couple of forums saying the same thing. What is really going on and how are the laptops able to do this?

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• Custom firmware for Asus WL-520g

  - by Jaroslav Záruba

  What custom firmware works with Asus WL-520g? (Note this is not 520gU, 520gC, etc.) I failed to flash it with Tomato (Tomato_1_28_ND.zip) - the admin UI does not accept the file, and when trying to tftp the file as adviced for 520gU all I get is this: Transfering file tomato-ND.trx to server in octet mode... Error occurred during the file transfer (Error code = 0): Error in SendPacket() call. I just saved the router form rather unsuccessful flash to DD-WRT (after few hours the router fell into coma), and I'd like to keep it as a backup should the new one die or whatever. (Unfortunately the stock firmware does not support WOL.)

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• "Programming error" exceptions - Is my approach sound?

  - by Medo42

  I am currently trying to improve my use of exceptions, and found the important distinction between exceptions that signify programming errors (e.g. someone passed null as argument, or called a method on an object after it was disposed) and those that signify a failure in the operation that is not the caller's fault (e.g. an I/O exception). As far as I understand, it makes little sense for an immediate caller to actually handle programming error exceptions, he should instead assure that the preconditions are met. Only "outer" exception handlers at task boundaries should catch them, so they can keep the system running if a task fails. In order to ensure that client code can cleanly catch "failure" exceptions without catching error exceptions by mistake, I create my own exception classes for all failure exceptions now, and document them in the methods that throw them. I would make them checked exceptions in Java. Now I have a few questions: Before, I tried to document all exceptions that a method could throw, but that sometimes creates an unwiedly list that needs to be documented in every method up the call chain until you can show that the error won't happen. Instead, I document the preconditions in the summary / parameter descriptions and don't even mention what happens if they are not met. The idea is that people should not try to catch these exceptions explicitly anyway, so there is no need to document their types. Would you agree that this is enough? Going further, do you think all preconditions even need to be documented for every method? For example, calling methods in IDisposable objects after calling Dispose is an error, but since IDisposable is such a widely used interface, can I just assume a programmer will know this? A similar case is with reference type parameters where passing null makes no conceivable sense: Should I document "non-null" anyway? IMO, documentation should only cover things that are not obvious, but I am not sure where "obvious" ends.

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• Installing Plone on Centos fails: Unable to find libssl or openssl/ssl.h.

  - by paskster

  My dedicated Server has CentOS 5.5. I tried to install Plone, so I basically did: wget launchpad.net/plone/4.0/4.0.2/+download/Plone-4.0.2-UnifiedInstaller.tgz tar xzf Plone-4.0.2-UnifiedInstaller.tgz cd Plone-4.0.2-UnifiedInstaller ./install.sh zeo I ran into the following error: Unable to find libssl or openssl/ssl.h. If you wish to build without SSL support, run install.sh again with --without-ssl flag. Otherwise, install your platform's openssl-dev libraries and headers and try again. After this error I successfully installed openssl: yum install openssl And i tried to install Plone again. But I keep getting the error: "Unable to find libssl or openssl/ssl.h". Anybody an idea what I'missing?

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• Comparison between these video cards?

  - by seedeg

  Currently I have a GeForce 8600GT as a video card. I started playing EVE online and it is not that smooth (Apart from the fact that my Windows 7 is starting to become slow so it needs a format). Now I have these 3 video cards on my mind: 1GB Gainward GF GT240 PCI-Express Video Card 1GB Gainward GF9800GT PCI-Express Video Card 1GB Gainward GF GT240-GS PCI-Express Video Card I tried comparing them from nvidia's site: HelpMeChoose but the GT240-GS is not available for comparison. However, when I tried comparing the GT240 with the 9800GT, the latter was the winner. You must keep in consideration that the cheapest one is the GT2400. The 9800GT is in the middle, and the one which is not available for comparison, the GT240-GS is the most expensive one (about 6 euros more than the 9800GT). Is the GT240-GS the best video card from these? Thanks in advance for your responses.

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• Installing VMware ESXi 4.0 on Dell 1950: Cannot open vmkboot.gz

  - by rlandster

  I am trying to install VMware ESXi 4.0.0 U1 on a Dell 1950 server via a bootable CD-ROM. I keep getting this error right at the start: Cannot open vmkboot.gz I checked that the CD-ROM drive is not to blame by installing Debian Etch using that drive. I tried several different versions of ESXi (3.5, 3.5 Dell edition, 4.0 Dell edition) and they all give me an error at the same place. I also tried installing from a USB "thumb" drive but got the same error. I checked with the VMware HCL (Hardware Compatibility List) and the Dell 1950 is listed as being compatible. Here are some server details: Two 1.6 GHz Xeon 5110 CPUs (ID: 06-0F-B) BIOS version 2.2.6 Any ideas on what might be the issue?

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• How secure is Windows IPSec VPN?

  - by sergeb

  I know the answer is, depends on how you configure it... But bare with me - our IPSec Site-to-Site VPN is configured by one of the most trusted hosting companies. One of our clients expressed concerns that "Windows Server 2008 Server IPSEC is not ICSA certified and lacks some of the common features for maintaining VPN stability" (they refer to the lack of "auto keep live" feature). They also are saying that "Windows platforms are not recommended as VPN endpoints due to security concerns and this is one reason that the ICSA testing labs will not certify it as a valid IPSEC solution" (I couldn't find a proof to this one) Are there any whitepapers or references that can prove the security of Windows IPSec implementation? Thanks!

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• Deleting large no of files on linux eats up CPU

  - by Sanjay

  I generate more than 50GB of cache files on my RHEL server (and typical file size is 200kb so no of files is huge). When I try to delete these files it takes 8-10 hours. However, the bigger issue is that the system load goes to critical for these 8-10 hours. Is there anyway where I can keep the system load under control during the deletion. I tried using nice -n19 rm -rf * but that doesn't help in system load. P.S. I asked the same question on superuser.com but didn't get a good enough answer so trying here.

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• Are copyright notices really required?

  - by Alasdair

  Ever since I made my first web page 13 years ago I have followed the pattern of showing a copyright notice in the footer of each page. Over the years the format of this notice has changed in the following way; Copyright © <NAME> yyyy. All rights are reserved. Copyright © <NAME> yyyy © yyyy <NAME> © <NAME> This has generally mirrored the format used by Google. However, I recently noticed that they no longer display a copyright notice on their home page nor have one in their source code/meta tags. I see they still display it on most (if not all) other pages. I understand that Google are very keen to keep the word count down on their homepage, which could be the reason for this sacrafice, but my question is more general and relates to all websites. Since I've always just done it out of habit, I'm hoping someone can explain if/when I a copyright notice is actually required to protect your content and rights. Also, when it is required, is there a format in which the notice must adhere to in order to be valid?

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• Is there a way to turn off the sound that plays when my computer reconnects to the wireless network?

  - by Dan Tao

  I know this seems silly. Obviously I could mute my computer, or turn the speakers off. But it seems like surely there should be a way that I can keep all of my normal computer sounds without having to hear this one sound (no, it doesn't really bother me; mostly my wife just wants me to turn it off because she finds it annoying). I tried right-clicking on the volume icon in the notification area and went through all of the sounds in the list, thinking I could find the one offending noise and just turn it off. But none of them seem to correspond to the sound that plays when my wireless adapter randomly disconnects and reconnects to the wireless network.

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• How to reduce the fan noise and how to increase battery life?

  - by mehdi

  I have a brand new Sony Vaio S series laptop.(VPCSA2DGX) It came factory installed with Windows 7 professional Edition 64bit. Runs Intel core i5, 500 GB HDD , 4GB Ram. First I installed ubuntu 11.10 64 bit along side Windows to dual boot. Later,since the problem did not solve, I installed ubuntu 12.04 64bit along side Windows to dual boot. However the problem keeps annoying me. Problem: When running ubuntu 11.10/12.04, the battery lasts only about 1.5 hours. The Fan runs loud and continuously. And there is a lot of heat generated. System monitor shows less than 5% CPU used. My laptop enjoys hybrid graphic and I tried turning off ADM graphic card and keep Intel graphic card on. However I can not get the Fan noise or heat to go away and consequently the battery drain continues. BTW, in windows, the laptop gives 4-5 hours of battery power, Fan is silent and there is no heat problem. Any ideas on how to reduce the fan noise and how to increase battery life in ubuntu 11.10/12.04?

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• How do I stop ubuntu from detaching minimize/maximuze/close buttons?

  - by Shahbaz

  Some time ago I managed to get ubuntu to keep the window menubars in the menu rather than the bar above (I'm not sure if this part is unity or compiz, or what's the difference). That was by removing indicator-appmenu Anyway, so now everything is fine except one thing: If I have a window that is full screen, the minimize/maximize/close buttons are still grabbed by the bar on the top. Usually this doesn't cause a problem because the upper-left corner of the full screen window and the whole screen are not too far apart. However, one thing happens to me a lot, and that is I am working on something (programming), then I need to check some things from other places so I open some windows, see what I want and switch back to my work. Those windows however are temporary so at some point I want to close them. Now here's what happens: I have the focus on some window and I can't close the maximized window behind it unless I click on the window first, so that the buttons appear and then close it. I couldn't find anything on the internet about this. Is this something that's hardcoded in unity/compiz/whatever or is there actually a way to configure this?

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• Google Chrome auto-clicker extension?

  - by Joel Murphy

  I'm looking for an auto-clicker that will auto click page elements in Google Chrome. Standard auto-clickers work fine, but I'd like to continue working on my computer without having to keep Google Chrome open. Does anyone know of any extensions that offer this functionality? Anything that allows me to specify an element to be clicked on, or set screen co-ordinates within a webpage and will click away until I decide to stop the script would be perfect. I've tried looking at macro extensions, but they don't seem to offer the functionality I want. Can anybody suggest a particular extension? Thanks in advance.

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• Download and Convert live stream video

  - by IcySnow

  I want to download live streaming video from some websites and it seems Internet Download Manager can handle the job. However, the video I want is just a small part of the live stream and the the stream itself never stops. Hence, IDM will just keep downloading all days and nights if I don't stop it myself. The problem is, the downloaded file (stored in the temporary folder) is of .stream extension. Mediaplayer Classic can open it perfectly, but it'd be very inconvenient to have such extension since I don't think I can carry it around and play it on other computer. I tried some video converters but all of them failed because the format is not supported. So my questions are: Is there a program specially made to download live rmtp video? IDM works, but the format is inconvenient. How can I convert .stream file to other extension, say AVI?

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• Spring to Java EE, Part Three - new tech article on otn/java

  - by Janice J. Heiss

  In a new article up on otn/java, Java EE expert David Heffelfinger continues his series exploring the relative strengths and weaknesses of Java EE and Spring. Here, he demonstrates how easy it is to develop the data layer of an application using Java EE, JPA, and the NetBeans IDE instead of the Spring Framework.In the first two parts of the series, he generated a complete Java EE application by using JavaServer Faces (JSF) 2.0, Enterprise JavaBeans (EJB) 3.1, and Java Persistence API (JPA) 2.0 from Spring’s Pet Clinic MySQL schema, thus showing how easy it is to develop an application whose functionality equaled that of the Spring sample application.In his new article, Heffelfinger tweaks the application to make it more user friendly.From the article:“The generated application displays primary keys on some of the pages, and these keys are surrogate primary keys—meaning that they have no business value and are used strictly as a unique identifier—so there is no reason why they should be visible to the user. In addition, we will modify some of the generated labels to make them more user-friendly.”He concludes the article with a summary:“The Java EE version of the application is not a straight port of the Spring version. For example, the Java EE version enables us to create, update, and delete veterinarians as well as veterinary specialties, whereas the Spring version of the application enables us only to view veterinarians and specialties. Additionally, the Spring version has a single page for managing/viewing owners, pets, and visits, whereas the Java EE version of the application has separate pages for each of these entities.The other thing we should keep in mind is that we didn’t actually write a lot of the code and markup for the Java EE version of the application, because the bulk of it was generated by the NetBeans wizard.” Have a look at the complete article here.

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• CodeIgniter's Scaffolding not working

  - by 01010011

  Hi, I keep getting a 404 Page Not Found whenever I try to access CodeIgniter's Scaffolding page in my browser, like so: localhost/codeignitor/index.php/blog/scaffolding/mysecretword I can access localhost/codeignitor/index.php/blog just fine. I followed CodeIgnitor's instructions in their "Create a blog in 20 minutes" by storing my database settings in the database.php file; and automatically connecting to the database by inserting "database" in the core array of the autoload.php; and I've added both parent::Controller(); and $this-load-scaffolding('myTableName') to blog's constructor. It still gives me this 404. Any suggestions?

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• Mouse click events are delayed when moving the cursor in xubuntu 12.04

  - by bobbaluba

  I am trying out live xubuntu on my samsung n150 (netbook, similar to eeepc). So far everything seems perfect, except for this one thing. When I am clicking the mouse while moving the cursour, the click event is delayed. This is extremely annoying when i try to to move windows, because i end up clicking the window behind the window i am trying to move and thereby changing focus. This goes for all applications. I.e selecting text is difficult. There is no lag in the cursor movement, just the click event. The click event is registered with the new mouse position, not the one when the mouse was clicked. I tried searching for the problem, but all the other cases where either kind of different, or had no solution. EDIT: After testing some more, here are some more information. The click doesn't occur until i stop moving the cursor. If I move the cursor smoothly around, the click never gets through. I have ubuntu netbook remix 10.04 installed, and have no problems with the mouse there. EDIT2: Once I connected a usb-mouse, the problem dissappeared. Dragging now works perfectly with both the track pad and the usb mouse. I will update once I have installed xubuntu and figured out if this is a persistant problem. EDIT3: I have installed, and the problem is still there. It dissappears when I have a second mouse connected however, and after I resume from suspend. My solution for now, is just to keep the dongle connected all the time.

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• We have moved to larger offices

  - by Chris Houston

  First of all we should probably apologise for the complete lack of blogging over the last 6 months! As web developers we are constantly telling our clients that they should keep their blogs up to date and it seems we have been ignoring our own advice.That being said, we have been very busy moving offices and helping our new host QV Offices setup their new business. As well as all the moving we have not been sitting on our hands, we have built the new site for DairyMaster over in Ireland as well as a separate private website for their global distributor network.As Umbraco Gold Partners we have found more and more that we are working on projects where we are the silent development partners, so although we cannot talk publicly about a lot of the sites we develop, we have some real beauties now in our portfolio :)Now that the dust has settled in our new office ( and has been hovered up! ) we are read for the new year and are looking forward to working on some exciting projects that are currently in the pipeline.We are also intending to run some Hacking sessions for Umbraco as we now have lots of space for developers to come and work with us, so if you have any ideas of a theme for an Umbraco Hackathon then do let us know.And with that it just remains to say Happy Christmas to you all and see you in the new year!

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• AFXR problem using gradwell secondary DNS

  - by Roaders

  Hi All I use Gradwell.com to provide secondary DNS but I keep getting e-mails along the lines of the following saying that it's not working: You have asked us to provide a secondary DNS service for the following domain(s) Unfortunately, the primary DNS server(s) you specified are not permitting the necessary zone transfers from our servers, or they are not answering "SOA" queries for your domain correctly. I have gone through the support procedure and they weren't that helpful. They have suggested the following: Our secondline team have suggested setting the AXFR to use anouther machine. This will ensure that the transfer is not locked down to one machine and should allow any machine to make the request I don't really know what AFXR is and I only have 1 production machine so I can't set the AFXR to use another one! In previous support correspondence we confirmed that I am allowing transfers to the correct IP and that I have the correct ports open on the firewall. I am running Windows Server 2003. What can I do to try and get these zone transfers working? Thanks

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• Version control and branching when using Oracle

  - by Ed Woodcock

  Hi folks: At work we're using Oracle and C#/ASP.net to handle a customer's website, this site is very large-scale so the database is very large. We use Perforce for our version control, and tack create or replace scripts to FogBugz cases whenever a database change, which has been fine until now, as we are now at a point where five developers are working on five expansions for the system, each on a seperate Perforce branch. Unfortunately, we cannot get duplicate databases, due to the database size, so everyone is still working from the same one. This is obviously a cause of problems: only ten minutes ago we had a bit of an issue where a stored procedure change for a branch propagated over to the Pre-Production server and caused a large number of crashes for the testers. Ideally, we would like a way to track these changes without having to manually keep track of them through FogBugz. My question is: how do you lot handle this situation? I'm sure there must be a good way by now to handle versioning, or at least tracking changes, in an Oracle database.

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• Issue with www to non www redirect

  - by bob

  Hello, I am on slicehost and I followed the articles that they gave for DNS redirection and the www to non www url redirection does work. However, what if I want a www.domain.com to be the default domain. Would I put www.domain.com. as my DNS record name or would I keep domain.com. as my DNS record and then do something else. Basically, what happens is if someone goes to the url www.domain.com/directory/something.html they will be redirected to domain.com and not domain.com/directory/something.html I would like the second thing to happen, not just go to domain.com and call it a day. I am running nginx and am confounded on how to solve this issue. I'm not sure whether its an nginx issue or a dns issue. Any help would be greatly appreciated!

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• What's a nice explanation for pointers?

  - by Macneil

  In your own studies (on your own, or for a class) did you have an "ah ha" moment when you finally, really understood pointers? Do you have an explanation you use for beginner programmers that seems particularly effective? For example, when beginners first encounter pointers in C, they might just add &s and *s until it compiles (as I myself once did). Maybe it was a picture, or a really well motivated example, that made pointers "click" for you or your student. What was it, and what did you try before that didn't seem to work? Were any topics prerequisites (e.g. structs, or arrays)? In other words, what was necessary to understand the meaning of &s and *, when you could use them with confidence? Learning the syntax and terminology or the use cases isn't enough, at some point the idea needs to be internalized. Update: I really like the answers so far; please keep them coming. There are a lot of great perspectives here, but I think many are good explanations/slogans for ourselves after we've internalized the concept. I'm looking for the detailed contexts and circumstances when it dawned on you. For example: I only somewhat understood pointers syntactically in C. I heard two of my friends explaining pointers to another friend, who asked why a struct was passed with a pointer. The first friend talked about how it needed to be referenced and modified, but it was just a short comment from the other friend where it hit me: "It's also more efficient." Passing 4 bytes instead of 16 bytes was the final conceptual shift I needed.

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• What's the proper way to merge two projects in source control software

  - by Mallow

  I'm using Fossil-SCM to maintain my projects. Since I don't work in a team I usually have just a very linear branch of development: 1.0 - 1.1 - 1.2 I'm wondering what the procedure is when you have one project who's task is about to be given to a related project. And thereby rendering the first project obsolete. Although I tend to rewrite most of my code if I don't remember having already written it, I still would like to keep the code archived. And I'ld rather not have a fossil repo that just is dead. Can I merge it? Is that the proper way of handling this? For example the code was extracting data from an excel file in order to format an HTML page. Now, I've convinced my employer to move their excel spreadsheet into a database to decrease redundancy, increase efficiency and yaddy yadda. Since I can now make logical queries that don't have to jump hoops to preform using the database I won't need the extra vbs files that originally manipulated the excel file. Technically I would be porting part of the existing code into the current new project. Since it already has it's own trunk, would it be advisable to combine the trunk of a different project to this one, and how would I do that exactly?? SO I guess my tree would look like this, and I haven't seen examples of software branching that resemble this inverted tree before so I'm wondering what the norm for a situation like this?

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• Sql server 2000 replication error

  - by Renato

  Good morning, I have a sql server 2000 machine, with SP4. I have a transactional replication. A keep receving this error message: The process could not execute 'sp_replcmds' on 'servername' the logreader stops responding.When i click start it starts fine, and the replication starts fine.And then, works for hours, and the problem comes back. In the begining i though it could be timeouts, but i already set a couple of parameters in the logreader profile,like querytimeout/readbatchsize. Sometimes when the logreader stops,it generates a dump, but not always. In event viewer, it appears this message: 17066 : SQL Server Assertion: File: , line=1985 Failed Assertion = 'startLSN = m_curLSN'. 18052 : Error: 3624, Severity: 20, State: 1. 17066 : SQL Server Assertion: File: , line=2223 Failed Assertion = 'm_noOfScAlloc == 0'. I also executed checkdb in the databases, and they are fine. have you every experienced something similar? thanks in advance, Renato Alves.

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