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• Basic clarification about Limited FTP/sFTP users

  - by mattewre

  I would like to get some clarification about the correct way to create limited users to access to my VPS user as WEBSERVER with Nginix. I'm used to NOT install FTP and access via SFTP only. It is ok for every set up? this is what I usually do from to create a limited user called "admin" that should be able to have access via SFTP to the folder with the website data mkdir -p /var/www/mysite.com/ adduser admin adduser admin www-data chown -R root:root /var/www chmod -R 755 /var/www chmod -R 755 /var/www/mysite.com chown -R admin:www-data /var/www/mysite.com/ It seems not to be the correct way, I always have problems with permission when I upload some files (for example with Wordpress in general). I would like to create an user that does work exactly as the one that the "provides" give to their client when they buy an Hosting service (that is a FTP, I would prefer SFTP access). It is for personal user, but I think that a limited user is a lot safer to use then the "root" via SFTP.

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• Xenserver boot error

  - by Adrian

  I'm trying to get Xenserver 5.5 running on a spare computer here, hardware specs: Intel Q6600, 4GB Ram, and Gigabyte GA-P35-DS3R motherboard Xenserver itself installs fine onto a 150GB sata hdd, however it fails to boot whatsoever, giving this garbled mess: http://img697.imageshack.us/img697/9918/biosi.jpg it's not frozen because if I press enter it just prints a different garble and it also says "could not find kernel image". The strangest thing is if I put that hdd in my desktop and assign it to a VMWare desktop vm (under the ESX profile no less) it boots perfectly... leading me to believe there are no problems with the install or the hdd itself. From what I can tell the error seems to be occuring completely seperately to Xenserver, in the bootloader extlinux?. If there was a motherboard compatibility issue I would think it would also have manifested during installation, and the fact the problem seems to be with the booting into Xen makes me doubt this. Any ideas guys? (I'm using Xen because it can do PCI passthrough without VT-d.)

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• Software RAID to hardware RAID, can it be done?

  - by gtaylor85

  Can it be done ... well. (For the record, I did not set this server up.) In my server there are 4 disks. 3 of them are in a software RAID5, and 1 has the OS installed. I want to buy a RAID controller, 4 new HDs and set up a hardware RAID5. If possible, I'd like to just image the current setup, and use it to build my new one. My questions are: Can I image a 3 disk RAID5 to 4 disk RAID5? Are there problems with this? What is considered best practice for your OS. To have it on a separate disk like it currently is, or to install it on the RAID5? Thank you. I can clarify anything. I'm not sure what other info might be pertinent.

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• Detecting collision between ball (circle) and brick(rectangle)?

  - by James Harrison

  Ok so this is for a small uni project. My lecturer provided me with a framework for a simple brickbreaker game. I am currently trying to overcome to problem of detecting a collision between the two game objects. One object is always the ball and the other objects can either be the bricks or the bat. public Collision hitBy( GameObject obj ) { //obj is the bat or the bricks //the current object is the ball // if ball hits top of object if(topX + width >= obj.topX && topX <= obj.topX + obj.width && topY + height >= obj.topY - 2 && topY + height <= obj.topY){ return Collision.HITY; } //if ball hits left hand side else if(topY + height >= obj.topY && topY <= obj.topY + obj.height && topX + width >= obj.topX -2 && topX + width <= obj.topX){ return Collision.HITX; } else return Collision.NO_HIT; } So far I have a method that is used to detect this collision. The the current obj is a ball and the obj passed into the method is the the bricks. At the moment I have only added statement to check for left and top collisions but do not want to continue as I have a few problems. The ball reacts perfectly if it hits the top of the bricks or bat but when it hits the ball often does not change directing. It seems that it is happening toward the top of the left hand edge but I cannot figure out why. I would like to know if there is another way of approaching this or if people know where I'm going wrong. Lastly the collision.HITX calls another method later on the changes the x direction likewise with y.

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• Packaging python software with custom dependencies

  - by viraptor

  Hi, I'm looking for a good way to package a Python application that is going to be deployed on a Debian server. The application itself depends on some modules which are not included in base Debian repository, although they might be in the future. This creates some problems... I depend on some patches to those modules. If the original module gets installed one day, the application will break. However if I install everything I need in a virtualenv just for that application, I lose the ability to upgrade Python itself (in case of security updates). The third option would be to rename my fork of the upstream module and just treat it as a completely separate one. But that would mean changing the code (not much work, but it wouldn't be that clean / universal anymore). Are there any other options that I missed? Are there any pros / cons I didn't see in the solutions above?

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• Which window manager do you use?

  - by Stephan202

  Combining "What is your default web browser?" and "What are the differences between Linux Window Managers", I ask you: which window manager do you use, and why? Myself I prefer a minimal window manager on the one hand (in the past I used Fluxbox), but on the other hand wish to go with the main stream, to ease finding (Googling) solutions in case of problems. Hence I stick with Gnome as it is shipped with Ubuntu. Why do you use the window manager which you use? I understand some reasons may be subjective, but please try to cite technical reasons where possible.

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• How to overcome politics of the net (Google translate code refuses to work from a specific region)

  - by Jawad

  According to the FAQ's I am not sure if my question is a ok to ask or will be closed or should I post it in the meta or even I would blame some one for downvoting it. However it is one that has been bugging me since the trouble strated. Let me explain. I have this Web Site. It uses the Google Translate API (Can't post the link, does not open from this region) with the following code. <meta name="google-translate-customization" content="9f841e7780177523-3214ceb76f765f38-gc38c6fe6f9d06436-c"></meta> <script type="text/javascript"> function googleTranslateElementInit() { new google.translate.TranslateElement({pageLanguage: 'en'}, 'google_translate_element'); } </script> <script type="text/javascript" src="http://translate.google.com/translate_a/element.js?cb=googleTranslateElementInit"></script> The problem is since this, it just stopped working. On the site you can see that I had to actually remove the above from here, here, and here while left it here, here, here and here. This is so because the the web site "refuses" to load at all with the pages that have the code (i.e., from this region.) If I use Firefox Stealthy Plugin and open the site in Firefox, It works like a charm without any problems. But with Google Chrome, Apple Safari and Opera Web browser, the site does not load/open at all because of the Google translate. (I know this because If I remove the Google Translate Code, the site works/loads fine) It was one thing to program for "cross browser compatability" and alltogether another to program for "cross region compatability". What can I do to make sure that the site works from anywhere? Do I completely remove the Google Translate code and just have to do without the additional functionality or Do I look for alternatives like this or according to this?

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• Is having functionality in DB a road block to scalability?

  - by Estefany Velez

  I may not be able to give the right title to the question. But here it is, We are developing financial portal for wealth management. We are expecting over 10000 clients to use the application. The portal calculates various performance analytics based on the the technical analysis of the stock market. We developed lot of the functionality through Stored procedures, user defined functions, triggers etc. through Database. We thought we can gain huge performance boost doing stuff directly in database than through C# code. And we actually did get a huge performance boost. When I tried to brag about the achievement to our CTO, he counter questioned my decision of having functionality implemented in database rather than code. According to him such applications suffer scalability problems. In his words "These days things are kept in memory/cache. Clustered data is hard to manage over time. Facebook, Google have nothing in database. It is the era of thin servers and thick clients. DB is used only to store plain data and functionality should be completely decoupled from the database." Can you guys please give me some suggestions as to whether what he says is right. How to go about architect such an application?

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• Teaching OO to VBA developers [closed]

  - by Eugene

  I work with several developers that come from less object oriented background like (VB6, VBA) and are mostly self-taught. As part of moving away from those technologies we recently we started having weekly workshops to go over the features of C#.NET and OO practices and design principles. After a couple of weeks of basic introduction I noticed that they had a lot of problems implementing even basic code. For instance it took probably 15 minutes to implement a Stack.push() and a full hour to implement a simple Stack fully. These developers were trying to do things like passing top index as a parameter to the method, not creating an private array, using variables out of scope. But most of all not going through the "design (dia/mono)log" (I need something to do X, so maybe I'll make an array, or put it here). I am a little confused because they are smart people and are able to produce functional code in their traditional environments. I'm curious if anybody else has encountered a similar thing and if there are any particular resources, exercises, books, ideas that would be helpful in this circumstance.

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• How do I get Graphics drivers / bluetooth / card reader working on an Acer Aspire V3-571G?

  - by Adam

  A couple of days ago I bought an Acer Aspire V3-571G laptop without a system installed on it. The only thing that was there was Linux Linpus. I created a bootable CD with Ubuntu 12.04 64-bit - I read that my processor was 64 bit and that it might be a good configuration for my gear (I'm not especially fluent with all the computer stuff, still trying to learn) and replaced Linpus with Ubuntu. Everything seemed to work fine, but there're few exceptions to that which came pass my way. My bluetooth doesn't work. It seems to be switched on, but when I check my system settings the button is actually off, and I can't drag it 'perminently' to the 'on' position. Tried a couple of commands I found on the net, none of them helped and there was no word whatsoever in my BIOS settings about enabling bluetooth. My card reader has some serious problems with copying more than one file at a time. I tried to put some music on my phone through a MicroSD card adapter (because my bluetooth doesn't work) and it got stuck every single time I copied an album on it. I'm not sure if all my drivers were properly installed, so I checked in the terminal if it could tell me sth about my graphics. typed: sudo lshw -c display and what i got was: *-display UNCLAIMED description: VGA compatible controller product: NVIDIA Corporation vendor: NVIDIA Corporation physical id: 0 bus info: pci@0000:01:00.0 version: a1 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress vga_controller cap_list configuration: latency=0 resources: memory:b2000000-b2ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:2000(size=128) *-display description: VGA compatible controller product: Ivy Bridge Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:44 memory:b3000000-b33fffff memory:c0000000-cfffffff ioport:3000(size=64) As I said I'm no expert and not english-speaking generally, but it doesn't seem to be right. I've got a NVIDIA GeForce GT 640M.

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• postfix smtp relay script

  - by Peter Sander

  I have a Postfix server and using it with Outlook (POP/SMTP). I have different sender addresses for an account. Now I want to configure a relay for a specific sender address. For example I have postfix for my main domain domain1.com. Now I have a sender address that is domain2.com. For that sender address I want that postfix to relay mail to a second SMTP server. I think that should be possible without problems. But the problem is that I have to create a SSH tunnel to the second server to connect to the SMTP server. But I cant use a persistent SSH connection so I want to know if it is possible that postfix executes some script before relaying the mail to the second SMTP server. I already found some information for executing a script when incomming emails but I only want to establish the SSH tunnel before postfix relays the mail to the second SMTP server.

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• Working with Reporting Services Filters–Part 5: OR Logic

  - by smisner

  When you combine multiple filters, Reporting Services uses AND logic. Once upon a time, there was actually a drop-down list for selecting AND or OR between filters which was very confusing to people because often it was grayed out. Now that selection is gone, but no matter. It wouldn’t help us solve the problem that I want to describe today. As with many problems, Reporting Services gives us more than one way to apply OR logic in a filter. If I want a filter to include this value OR that value for the same field, one approach is to set up the filter is to use the IN operator as I explained in Part 1 of this series. But what if I want to base the filter on two different fields? I  need a different solution. Using the AdventureWorksDW2008R2 database, I have a report that lists product sales: Let’s say that I want to filter this report to show only products that are Bikes (a category) OR products for which sales were greater than $1,000 in a year. If I set up the filter like this: Expression Data Type Operator Value [Category] Text = Bikes [SalesAmount]   > 1000 Then AND logic is used which means that both conditions must be true. That’s not the result I want. Instead, I need to set up the filter like this: Expression Data Type Operator Value =Fields!EnglishProductCategoryName.Value = "Bikes" OR Fields!SalesAmount.Value > 1000 Boolean = =True The OR logic needs to be part of the expression so that it can return a Boolean value that we test against the Value. Notice that I have used =True rather than True for the value. The filtered report appears below. Any non-bike product appears only if the total sales exceed $1,000, whereas Bikes appear regardless of sales. (You can’t see it in this screenshot, but Mountain-400-W Silver, 38 has sales of $923 in 2007 but gets included because it is in the Bikes category.)

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• Favicon on gmail has changed from the envelope to a black gun. How do i change it back and why did i

  - by Victoria

  I think my gmail account might have been hacked because I've recently noticed a change in the favicon displayed in the url and the tab, when I logged onto my gmail account. It used to be the common red and white envelope and now it's a black gun. Can anyone tell if this is enough to conclude that my account has been hacked or tampered with? I know someone that would be capable and most probably willing to cause problems to my account among other things. This would be my opsessive ex who's best friend is a hacker. Can anyone help? I need to know if someone has reigns to my computer. And how do I change the favicon back to its orginial image? The black gun really bothers me. Thanks everyone!!!

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• I don't know how to connect to the internet

  - by Michiel

  I'm having some trouble finding an answer to my problem. I have a dell desktop (studio hybrid) and i have windows vista on it. The internet on windows vista works great, no problem. But now i downloaded Ubuntu 11.10 and I'm having problems. I can't find how to connect to my wireless network, when i click the network icon, it shows a list of things but I can only click 'enable wireless network' or something like that and 'edit connections'. But in this list it also says ( in a grey collor and i can't click it ) : 'No wireless connection, device not ready (firmware missing)" Or something like that. Now i tried several things i read on the internet (using my vista OS cause i can't use ubuntu for the internet, which is really enoying). But none of them helped me. I would like someone to tell me what my problem is or what information I have to give you to get an answer. So tell me if i have to edit a connection, or tell me how i have to get the wireless connection to work and to repair the 'firmware missing problem'. I hope someone can/is willing to help me. Bye

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• Do you store mysql exports in your version control tool for reverting to in event of error?

  - by Rob

  We run an internal web server with in-house software to run a manufacturing line. When new product features are to be added, either or both of the following occur: changes to the in-house server software may be required to support these - these are for significant changes in functionality, being code drive. changes to the MySQL database for new entries for the part numbers, these are for smaller changes, configurations, changes to already existing values and parameters -- such changes don't require code changes. Ideally we'd want our changes to be here rather than in item 1. Item 1 is version controlled in Subversion, so previous revisions can be referred to for rolling back to in the event of problems introduced in the latest revision. But what about changes to the MySQL database? We have quality processes to ensure that such changes are error-free but there is always a chance that errors can pass through, e.g. mistake in data entry or faults with the code that uses the MySQL corrupting the database etc. We have a automated backup every 6 hours but what if we want more manual defined checkpoints in between these intervals, we could use the same backup system but I wondered if folks here used other methods to store previous states of databases, e.g. exporting the database as a plain text SQL dump -- at least with this method it would be possible to see diffs e.g. in Beyond Compare for trouble shooting. Thoughts?

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• Setting up Shibboleth to secure part of a website

  - by HorusKol

  I've installed the Shibboleth module for apache on Ubuntu 10.04 using aptitude to install libapache2-mod-shib2 as per https://groups.google.com/group/shibboleth-users/browse_thread/thread/9fca3b2af04d5ca8?pli=1 and enabled the module (I have checked in /etc/apache2/mods-enabled) I then proceeded to secure a directory on the server by placing a .htaccess file with the following directives: AuthType shibboleth ShibRequestSetting requireSession 1 Require valid-user Now - I haven't set up an SSL host yet - and I also haven't set up the IdP - but I would expect that the server would block access to this directory - but I'm getting the content without any problems. I have restarted the apache service and I have no errors in the log files.

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• Reliability of S.M.A.R.T.?

  - by Mark

  I've been using ActiveSmart to monitor my hard-drives health for a few weeks now, and its telling me my brand new 1.5 TB hard-drive is half-dead already. About on-par with one of my hard-drives which I know is at least half dead because I've been having some read errors and heard ticking noises. Now I haven't actually noticed any problems with my 1.5 TB drive; should I be concerned that it's going to crap out on me too? Or could ActiveSmart be giving a mis-diagnosis because I use it a lot or something (I've used up 795 GB in the 2 and a half weeks I've had it). The events that ActiveSmart has been catching is "Hardware ECC recovered". Maybe these new fangled super big hard-drives somehow rely on ECCs to squeeze out the extra space, but this isn't actually a cause for concern?

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• Tomcat log include servlet context

  - by Kris

  I have a Tomcat instance running several websites. Recently I've been trying to deal with the various error messages that wind up in the Tomcat log file (catalina.out). None of the issues are affecting the websites, but all the noise is making it difficult to see actual problems. My problem is that frequently the message is being emitted by a library that is used by multiple webapps. Unless a stacktrace is included (which it often isn't) I can't tell which webapp is responsible without a lot of digging. So the question is, can I somehow configure Tomcat to include the servlet context in the log file? Or perhaps have different log files per context?

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• Trying to install Canon LBP7750Cdn driver on Ubuntu 12.04

  - by Gideon

  I'n new to Ubuntu/Linux and had significant difficulties while attempting to configure my printer to work. The automatic driver pairing wizard which Ubuntu uses to identify and install the appropriate drivers did not find my printer's driver. I managed to get it to print when I manually select the generic configuration and checked the PCL6 configuration. However, the printer driver wizard does provide a list of Canon printers and actually do specify my printer as LBP7750C (minus the "dn" at the end, I'm assuming its because duplex ability and networking is not present on all the models - I'm not sure if this could be the source of the problem), but in selecting this option and trying to print I receive this message: Idle - /usr/lib/cups/filter/foomatic-rip failed I searched for this similar problem which other users might have encountered, but while there where plenty of such cases, they all had different resolutions and were all related to HP printers. Canon actually do provide a driver for my printer, but it comes with no installation instructions unless you consider yourself an experienced CUPS guru. Seriously. If anyone can help me solve this foomatic-rip failed problem I'd be really grateful - and I'm sure many other folks too. [BTW, can't Canonical fix this type of thing for the next Ubuntu release? - I't seems like a small problem but it causes many problems and countles hours of production time loss.] Thanks in advance.

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• Setting up SSL with 389 Directory Server for LDAP authentication

  - by GioMac

  I've got 389 Directory Server running on RHEL 5 with groups, users, posix etc. RHEL clients are authenticating users with LDAP - no problems, everything works perfect, but passwords are sent in plaintext and are visible with network sniffer. So, decided to run with SSL: Created CA - got both private and public CA certificates Using CA certs: generated both of private and public certificates and combined (1st file) for 389DS according to 389DS certificate request, imported with CA public cert to 389DS from graphical console (2nd file). Enabled SSL in 389DS On the client, using authconfig-gtk enabled SSL for LDAP, specified only CA public certificate Doesn't work. Howto? What is the best way to integrate safely?

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• My first time in the gambling industry

  - by sfrj

  I am a Java enterprise developer with almost 3 years of professional experience. Soon i am going to have a face to face interview with a company in the gambling industry. I already did successfully a phone screening and now for the personal interview i suppose they will ask me about some kind of white board problem or system design task. I think i am in the right place to ask about this, and would appreciate a lot if someone would give me some tips or share something related to his own experience. The things i am more interested in regarding my interview are: What are the most common challenges for programmers, in this industry? Any idea or suggestion on a white board problem they may ask me? Could you point me to some links where i can find information on the topic or sample problems in this industry?. I personally find this question very interesting not just for me. Also i think, the given answers can help also others in a similar situation. Just what i want to say whit this last comment is: Please avoid, answers like: www.google.com and so on...

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• What's the best way to learn/increase problem-solving skills?

  - by tucaz

  Hi all! I'm not sure this is the right place to ask this question, neither if this is the right way to ask this question but I hope you help me if it is not. I work as a programmer since I was 15 (will be 24 next week) so learning programming logic was somehow natural during the course of my career and I think that it helped me to get pretty good problem-solving. One thing none of us (programmers) can deny is that programming logic helps us in a lot of fields outside computer programming. So I'd say it is a very valuable resource that one should learn. My girlfriend is not a programmer and graduated in college on a non related course (Foreign Relations) because she didn't know what to study back then. As the years passed she discovered that she liked Logistics and started to work with it almost two years ago. However, since she does not have a technical background (not even basic Math) she is really having a hard time with it. She is already trying to catch up with Math, but even simple questions/brain-teasers are hard to her. For example, trying to find the missing numbers of this sequence: 0, 1, 1, 2, 3, 5, 8, _, _, 34 and so on. We know that this is Fibonacci but if we didn't we would probably be able to get to the correct answer just by "guessing" (using our acquired problem-solving skills). I'm not sure if problem-solving skills or logic are the correct name for it, but this is what I mean: quick solve problems, brain-teasers, find patterns, have a "sharp" mind. So, the question is: what is the best way for someone to learn this kind of skills without being a programmer (or studying algorithms and such)? If you say it is a book, could you please recommend one? Thanks a lot!

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• Boot from external usb hdd won't work in 12.04

  - by Ben Andersen

  I've been running 10.04 on an external USB HDD without problems for years. I installed 12.04 on an external USB HDD and it worked until I upgraded to all the new packages. But after that it wouldn't boot. I just got into the grub prompt. So then I tried installing on the disk inside the computer and that worked fine. But when I take it out and use it as an external USB HDD I just get: error: hd0 out of disk. grub rescue> How can I fix this? So why do I want this you might wonder? Well I have a laptop at home and a somewhat similar at work. And I just move the disk between them and don't have to move a heavy laptop. So I really hope I can continue doing this with 12.04! The old disk is only 80Gb but the new one is 320Gb (7200rpm Toshiba). I'm using 12.04 on a 64Gb SSD as an external drive and it warns about out of disk but it boots anyway most of the times.

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• Will Bluetooth hands-free drivers be installed if BT stack doesn't support A2DP?

  - by AndrejaKo

  I have a hands-free device which has no problems being paired with windows and I can set it to be the default sound output device, I don't actually hear anything on the unit, but it worked fine with GNU/Linux and with my mobile phone. From what I can see, the cause of that is usually a problem with Bluetooth stack. I think that I have Broadcom Bluetooth stack installed, so it should be working but it isn't. To make things better, my Bluetooth radio is integrated into my laptop and manufacturer isn't providing drivers for it and Broadcom itself recently pulled support, so I can't just reinstall the stack to make sure I have newest version.

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• Tracking down random BSOD on windows 7

  - by pehrs

  I have gotten a computer running windows 7 handed to me that randomly, several times a day, bsods with a PAGE_FAULT_IN_NONPAGED_AREA (50) or WHEA_UNCORRECTABLE_ERROR (124). Crashes happens regardless of load. I am running out of ideas for how to track this down. Analyzing the minidumps shows the crash to be in ntkrnlmp.exe/WMIADAP.exe System has plenty of power (600w) Ram checks out fine using memtest86+ over a weekend. System is clean inside. No dust build up. Temperatures stay low. As far as I know (and reliability history shows) no new drivers were installed for several months before the problems started. All drivers are now up to date. sfc /scannow reports the system as clean. CHKDSK reports the disks as clean Removing the AV (Avast) has no effect. Any more things that should be tried on windows 7 before I start replacing the hardware?

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