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• Postfix - Block email from non-existent local addresses

  - by Kelso.b

  My question is very similar to this one, but for postfix. We keep getting emails from addresses like "[email protected]" delivered to other "@ourdomain.com" addresses. From my google research, I understand it might not be practical to verify the email originated from our IP or VPN (Although this would be ideal, so if you can think of a way to do this, let me know), but in most of these cases the sender address (ex. "accounting") is not a valid account. I imagine there must be a way to make sure that a local account exists before delivering the message.

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• mount ext4 formated external drive->the drives green light won't stop flashing

  - by Gohlool

  I've installed kubuntu (after 10 years I am trying to play with linux) and manged to attach a external 1TB HDD drive over USB! The drive was formatted with NTFS and everything was working OK. I also changed the /etc/fstab here is my ntfs mount setting: /dev/sdb1 /media/samsung nts-3g auto,user,uid=1000,gid=1000,fmask=000,utf-8 0, 0 Now, I've reparationed the drive and formated it with ext4 filesystem! change my fstb like: /dev/sdb1 /media/samsung ext4 defaults,noatime 0, 0 now, when I plug my dive/or call sudo mount -a, my external drive's green light starts to flash and won't stop, but mount works .... What is the Problem? is this because of ext4? because with NTFS this won't happen! btw. after changing the owner of the /media/samsung and setting permissions 777, I can also access my drive like creating new folder atc. (although is's flashing constantly)! What is my mistake? btw. can you please let me know how to set the owner and the permissions for my /media/samsung directory in fstab for ext4 like I did it for NTFS? Thanks in advance

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• Adjusting the rate of movement of different objects on the same timer

  - by theUg

  I have a series of objects moving along the straight lines. I want to implement slight changes of velocity of each of the object. Constraint is existing model of animation. I am new to this, and not sure if it is the best way to accommodate varying speeds, but what do I know? It is a Java application that repaints the panel every time the timer expires. Timer is set via swing.Timer object that is set by timer delay constant. Every time the game is stepped objects’ coordinates advanced by an increment constant. Most of the objects are of the same class. Is there fairly easy way to refactor existing system to allow changing velocity for an individual object? Is there some obvious common solution I am not aware about? Idea I am having right now is to set timer delay fairly small, and only move objects every so many cycles of animation so that the apparent speed can be adjusted by varying how often they get moved. But that seems fairly involved, and I do not think it is the most elegant solution in terms of performance what with repainting the whole frame every 3-5 milliseconds. Can it be done by advancing the objects so many (varying) times during the certain interval (let’s say 35ms for something like 28fps), and use repaint() method to redraw just individual object? Do I need to mess with pausing animation for smoothness at higher redraw rates? Is it common practise to check for collision at larger step interval, but draw animation a lot more frequently?

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• using iphone to control mac

  - by Ajay Pandey

  i want to use iPhone touch screen as the touchPad for my mac while both devices are connected via bluetooth. So far i hv gone for two approaches what i want is an application which when launched turns the bluetooth on and get connected to mac.Further ...screen of iPhone becomes the touch pad for mac. i dont want to install anything at the mac like any server........ I have already tried the vnc and remotePad approach. the one with vnc looks more promising for me..but even in that case i have to install a vnc server on mac ,i guess and then we'll have to actually call vnc client while my application is still running,which does not look real in 3.2 verson as it does not support multi tasking. Is there any other way of doing it? or is there anything wrong in my above interpretation? please let me know if there is anyother approach of doing the same or if i can do any thing different with my current approach. hoping for quick response Thanks

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• Is it considered poor programming to do this with xna components?

  - by Rob

  I created my own Menu System that is event driven. In order to have a loading screen and multithreaded loading to work, I devised this sort of implementation: //Let's check if the game is done loading. if (_game != null) { _gameLoaded = _game.DoneLoading; } //This means the game is loading still, //therefore the loading screen should be active. if (!_gameLoaded && _gameActive) { _gameScreenList[2].UpdateMenu(); } //The loading screen was selected. if (_gameScreenList[2].CurrentState == GameScreen.State.Shown && !_gameActive) { Components.Add(_game = new ParadoxGame(this)); _game.Initialize(); //Initializes the Game so that the loading can begin. _gameActive = true; } In the XNA Game Component that contains the actual game, in the LoadContent method I simply created a new Thread that calls another method ThreadLoad that has all the actual loading. I also have a boolean variable called DoneLoading in the XNA Game Component that is set to true at the end of the ThreadLoad. I am wondering if this is a poor implementation.

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• How is determined an impact of a requirement change on the existing code?

  - by MainMa

  Hi, How companies working on large projects evaluate an impact of a single modification on an existing code? Since my question is probably not very clear, here's an example: Let's take a sample business application which deals with tasks. In the database, each task has a state, 0 being "Pending", ... 5 - "Finished". A new requirement adds a new state, between 2nd and 3rd one. It means that: A constraint on the values 1 - 5 in the database must be changed, Business layer and code contracts must be changed to add a new state, Data access layer must be changed to take in account that, for example the state StateReady is now 6 instead of 5, etc. The application must implement a new state visually, add new controls for it, new localized strings for tool-tips, etc. When an application is written recently by one developer, it's more or less easy to predict every change to do. On the other hand, when an application was written for years by many people, no single person can anticipate every change immediately, without any investigation. So since this situation (such changes in requirements) is very frequent, I imagine there are already some clever techniques and ways to predict the impact. Is there any? Do you know any books which deal about this subject? Note: my question is not related to How do you deal with changing requirements? question. In fact, I'm not interested in evaluating the cost of a change, but rather the way to predict the parts of an application which will be concerned by the change. What will be those changes and how difficult they are really doesn't matter in my question.

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• mysql single database relocation

  - by asdmin

  I would like to know if it's possible to operate different databases on different filesystem locations. Background: we are a hosting service, which hosts mysql, web, and smtp to it's customer, but all our services (sql, smtp, http) are located in a different place. We are going to assign a single logical volume to a customer, which will accommodate the customer's mailing, weppages and (hopefully) sql database. Web pages and mailing are already covered, but I am not able to find a configuration setting which would enable me to specify the location of a database (the directory where mysql stores the DB). Let me please highlight, the target here is to relocate different databases to different locations in the filesystem, not moving them from a single place to an another (single) place. Also please do not bother answering with soft and hard symbolic links. ;) Thanks

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• Inexpensive degaussers or HDD shredders?

  - by Nicholas Knight

  I do a lot of work for a small cash-strapped business that has a lot of active hard drives, most are consumer-grade SATA of about five years of age, and predictably they are dying at an increasing rate, and a lot of the time they can't even be detected, let alone complete a zero-out cycle. Right now those drives are just being stored, but that can't continue forever. We've got a couple bad LTO tapes it'd be nice to deal with, too. There are very real security and legal issues that make dropping them off with someone who claims they'll be properly destroyed a gamble. I've looked around at degaussers and HDD shredders, and the ones that don't look like they come from some guy in his basement all seem to be $3000+, which is hard to swallow right now. Is there anything out there in the $500-1500 range that you would recommend? (Speed isn't a big issue, if it takes several minutes or even hours per drive, that's completely OK, we've only got 10 or so thus far.)

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• What does dd conv=sync,noerror do?

  - by dding

  So what is the case when adding conv=sync,noerror makes a difference when backing up an entire hard disk onto an image file? Is conv=sync,noerror a requirement when doing forensic stuff? If so, why is it the case with reference to linux fedora? Edit: OK, so if I do dd without conv=sync,noerror, and dd encounters read error when reading the block (let's size 100M), does dd just skip 100M block and reads the next block without writing something (dd conv=sync,noerror writes zeros to 100M of output - so what about this case?)? And if is hash of original hard disk and output file different if done without conv=sync,noerror? Or is this only when read error occurred?

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• OpenVZ multiple networks on CTs

  - by user6733

  I have Hardware Node (HN) which has 2 physical interfaces (eth0, eth1). I'm playing with OpenVZ and want to let my containers (CTs) have access to both of those interfaces. I'm using basic configuration - venet. CTs are fine to access eth0 (public interface). But I can't get CTs to get access to eth1 (private network). I tried: # on HN vzctl set 101 --ipadd 192.168.1.101 --save vzctl enter 101 ping 192.168.1.2 # no response here ifconfig # on CT returns lo (127.0.0.1), venet0 (127.0.0.1), venet0:0 (95.168.xxx.xxx), venet0:1 (192.168.1.101) I believe that the main problem is that all packets flows through eth0 on HN (figured out using tcpdump). So the problem might be in routes on HN. Or is my logic here all wrong? I just need access to both interfaces (networks) on HN from CTs. Nothing complicated.

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• Is the Zune HD's audio card better or worse than the iPod touch's?

  - by MatthewThepc

  Firstly, if this is the wrong site to ask this question I apologize, but I didn't see one for "music players" on the stack exchange website :) After reading a few people online say that music playing from a Zune HD sounds better to them than that on an iPod touch, I was wondering whether there's any truth to that? From what I can tell, the Zune HD uses a Wolfson Microelectronics WM8352, while the first-generation iPod Touch (which the Zune HD was competing with) used a Wolfson Microelectronics WM8758BG, and newer models use the Cirrus Logic CS4398 and CS42L61. Which ones are better (to make the question less subjective, let's say in terms of quality, range, & accuracy of output)? Admittedly, I have almost no idea how everything compares and works together, but it would seem to me that, just by looking at the version numbers, the iPod has been better since it's launch. Is there anything else that effects sound quality? Thanks!

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• Troubleshooting "connection reset" error on my linux server

  - by Chris

  I fervently hope someone here can help me with the problem I am experiencing. I am a programmer, and I have very little understanding of linux sysadmin terminology/concepts. I am attempting to troubleshoot a problem with my website. It is a Facebook app, and whenever I try to connect using Chrome, I get an error stating that the "connection was reset". I have been Googling for four days straight trying to find a solution to this problem, but no joy. A big part of the problem is that I do not understand the terminology being employed, and the output from many of the tools referenced is likewise indecipherable to me. I am running a VPS with CentOS 5, apache, PHP, and MySQL. I could spam this post with a ton of information from my iptables, apache, etc but if anyone needs information from my server, please let me know how to get it, and I will post it here. Thank you for any help you can offer!

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• Ubuntu dual boot and grub error 18

  - by srboisvert

  I've attempted to install 9.04 on an older toshiba laptop with a new 300GB drive and am getting the dreaded Grub error 18 that indicates that grub is looking beyond the bios readable area of the HD and failing. I just let ubuntu roll with its default selections when installing and ended up with this: Drive layout /dev/sda1 -ntfs 128GB -boot /dev/sda2 -extended 170GB -lba /dev/sda5 -ntfs 167.59GB /dev/sda6 -ext3 2.33GB /dev/sda7 -linux-swap 172MB I'd like make the system dual bootable without having to reinstall windows (real pain since I would have to go through an obstructionist IT dept). I know I can make windows bootable with a rescue disk and fixmbr but is there something I can do to make it dual bootable using the ubuntu livecd? Alternately, what should I have done at the partition stage of ubuntu installation to avoid this?

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• Time difference between servers after disaster recovery

  - by Sandokan

  We are running an old training system based on Windows Server 2003 and XP-clients. The solution is rather simple with four servers, two of them beeing DC:s. Everything is preconfigured and that goes for backup scheme as well. The backup software is Symantec BackupExec 2010. The scheme is a standard GF-F-S routine with full backups running once a week on Sundays. The other six days run differential backups. Now let's say in a worst case scenario, a server crashes on Saturday and we have to restore it from backup. The last backup will then be six days old and thus it will come online with six days old configurations. Will this pose a problem for the other servers or will the recovered server "get in line" eventually?

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• What's the utility of the return command in autohotkey?

  - by Shashank Sawant

  In the instances where the return command returns a value, the utility is obvious. I have seen the return command being used even when it is seemingly unnecessary. Let me show the following examples: Example 1: Loop { if a_index > 25 break ; Terminate the loop if a_index < 20 continue ; Skip the below and start a new iteration MsgBox, a_index = %a_index% ; This will display only the numbers 20 through 25 } Example 2: IfWinExist, Untitled - Notepad { WinActivate ; Automatically uses the window found above. return } Why is the return command used in Example 2 but is not used in Example 1? Both examples are copy-pasted/modified-pasted from the autohotkey.com's documentation.

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• Why is purchasing Microsoft licences such a daunting task? [closed]

  - by John Nevermore

  I've spent 2 frustrating days jumping through hoops and browsing through different local e-shops for VS (Visual Studio) 2010 Pro. And WHS (Windows Home Server) FPP 2011 licenses. I found jack .. - or to be more precise, the closest I found in my country was WHS OEM 2011 licenses after multiple emails sent to individuals found on Microsoft partners page. Question being, why is it so difficult to get your hands on Microsoft licenses as an individual? Sure, you can get the latest end user operating systems from most shops, but when it comes to development tools or server software you are left dry. And companies that do sell licenses most of the time don't even put up pricing or a self service environment for buying the licenses, you need to have an hawk's eye for that shiny little Microsoft partner logo and spam through bunch of emails not knowing, if you can count on them to get the license or not. Sure, i could whip out my credit card and buy the VS 2010 license on the online Microsoft Shop. Well whippideegoddamndoo, they sell that, but they don't sell WHS 11 licenses. Why does a company make it so hard to buy their products? Let's not even talk about the licensing itself being a pain.

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• Is it possible to have multiple subdomains point to the same Blogger blog?

  - by cclark

  For our application we want to have a status page which is hosted outside of the rest of our infrastructure so in case there are issues in our data center we can post updates for our users and our users will be able to access them. We registered a blog on Blogger and set it up with xyzstatus.blogspot.com and status.xyz.com. Everything seems to work fine. We need to perform some maintenance at our datacenter which will sever all connectivity so we're unable to have a redirect using nginx or apache. We'd like to do this with a short TTL CNAME DNS entry. Ideally www.xyz.com and app.xyz.com could be CNAMEd to status.xyz.com. When I setup the CNAME and go to that URL I get a Google broken robot 404 page. I figure I must need to let Google know it should associate traffic to www.xyz.com and app.xyz.com to the blog served up by status.xyz.com. But I can't see anywhere to do this in Blogger. Does anyone know if this is possible?

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• TCP connection between PCs in home wi-fi network

  - by Nordvind

  I want to establish a connection between 2 PCs. Point is to practice in writing client-server applications and similar stuff. I've heard around, that I can access another PC in network by address like "Router IP:port number". Am I right or i got it wrong? So how do I configure router to let connections to certain ports? And what would address look like, if I'm, say, connecting to 80 port on my home server? P.S. Will be grateful for links to some tutorials on this matter, if any.

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• Excel 2010: Copy row conditionaly

  - by TimothyHeyden

  I've searched for a similar question here, but haven't been able to find something that answers my issue. I'm a mediocre user of Excel 2010 with no experience in macro's. I have a dataset where each row represents a data entry. Let's say each row can be for each of its values (the columns) the maximum or minimum of the entire dataset. How can I create a row at the top where the, for instance, maximum row is shown dynamicly? So when extra data is added to the bottom of the dataset, the new maximum (if applicable) is shown in that row at the top. Thank you in advance!

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• OS choice for functional developing

  - by Carsten König

  I'm mainly a .NET developer so I normaly use Windows/VisualStudio (that means: I'm spoiled) but I'm enjoying Haskell and other (mostly functional) languagues in my spare time. Now for Haskell the windows-support is ok (you can get the Haskell-Platform) but latley I tried to get a basic Clojure/Scheme environment set up and it's just a pain on windows. So I'm thinking about trying out another OS for better tooling and languague support. Of course that leaves me with MacOS or some Linux distribution. I never used MacOS before and of course Linux would be cheaper (free) and I don't think I can parallel-boot MacOS on your normal PC-Hardware (can you?). PLUS: I don't have a clue about the tools you can use on those (to me) forign OSs. To make it short: I want to explore more Haskell, Clojure, Scala, Scheme and of course need at least good tooling for JavaScript/HTML5/Css. Support for .NET/Mono/F# would be great but for this I will still have my Win7 boot. So I like to know: - what is your prefered OS, Distribution (is Ubuntu viable?) - what Editor/IDE are you using Thank you for your help! PS: I'm not sure if this is the right place for this question but I surely hope so - if not please let me know where I should move this to (StackOverflow don't seem to be the right place IMHO)

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• Best design for a "Command Executer" class

  - by Justin984

  Sorry for the vague title, I couldn't think of a way to condense the question. I am building an application that will run as a background service and intermittently collect data about the system its running on. A second Android controller application will query the system over tcp/ip for statistics about the system. Currently, the background service has a tcp listener class that reads/writes bytes from a socket. When data is received, it raises an event to notify the service. The service takes the bytes, feeds them into a command parser to figure out what is being requested, and then passes the parsed command to a command executer class. When the service receives a "query statistics" command, it should return statistics over the tcp/ip connection. Currently, all of these classes are fully decoupled from each other. But in order for the command executer to return statistics, it will obviously need access to the socket somehow. For reasons I can't completely articulate, it feels wrong for the command executer to have a direct reference to the socket. I'm looking for strategies and/or design patterns I can use to return data over the socket while keeping the classes decoupled, if this is possible. Hopefully this makes sense, please let me know if I can include any info that would make the question easier to understand.

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• Product Support News for Oracle Solaris, Systems, and Storage

  - by user12244613

  Hi System Support Customers, April Newsletter is now available The April, 2012 Newsletter for Oracle Solaris, Systems, and Storage is now available via document 1363390.1 *Requires a My Oracle Support account to access. Please take a few minutes to read the newsletter. The newsletter is the primary method of communication about what we in support would like you to be aware of. If you are not receiving the newsletter, it could be due to: (a) Your Oracle profile does not have the allow Oracle Communication selected (on oracle.com Sign In, or if logged in select "Account" and under your Job Role, check you have selected this box : [ ] Yes, send me e-mails in Oracle Products.... (b) you have not logged a service request during the last 12 months. Oracle is working to improve the distribution process and changes are coming and once they are ready I will write more about that. But today if you don't automatically receive the newsletter all you can do is save it as a favorite within My Oracle Support and come back on the 2nd of each month to check out the changes. This month I am really interested to find out from you is the Newsletter providing you the type of items that you are interested in. To gather some data on that, I have a small 2minute survey running on the newsletter or you can access it [ here ] Finally, if you think I am missing a topic in the Newsletter, let me know by taking the survey or suggesting a topic via this blog. Get Proactive Don't forget about being Proactive. The latest updates for Systems and Solaris pages in the Get Proactive area are now available. Check out document 432.1 and learn what proactive features are available for Systems and Solaris.

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• How to fill sequence in Excel from ranges given in another sheets?

  - by amyassin

  I have an Excel sheet where two columns (say J and K) among data in sheet1 are as follows: J ------------ K 1 ----------- 25 26 --------- 50 101 ------ 150 Which are some ranges. I have another sheet where I have column (let's say I), which I want to update it to have the values as indicated by the range; i.e. column values of I to be 1,2,3,...25,26,27,...50,101,102,103,...150 (vertically). Note that ranges in J-K are not always continuous (e.g. gap between 50 and 101) and not always in the right order. I'm trying to find some automated way to achieve that, instead of manually copying the starting value of the range (from I) and then dragging down sequentially until the ending value (from J) for every individual I and J value, which is a very huge set of data. Is there any way to help doing that? Note: I'm using Microsoft Excel 2013, but a solution for excel 2010 or 2007 is more than welcomed...

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• How to convince a client to switch to a framework *now*; also examples of great, large-scale php applications.

  - by cbrandolino

  Hi everybody. I'm about to start working on a very ambitious project that, in my opinion, has some great potential for what concerns the basic concept and the implementation ideas (implementation as in how this ideas will be implemented, not as in programming). The state of the code right now is unluckily subpar. It's vanilla php, no framework, no separation between application and visualization logic. It's been done mostly by amateur students (I know great amateur/student programmers, don't get me wrong: this was not the case though). The clients are really great, and they know the system won't scale and needs a redesign. The problem is, they would like to launch a beta ASAP and then think of rebuilding. Since just the basic functionalities are present now, I suggested it would be a great idea if we (we're a three-people shop, all very proficient) ported that code to some framework (we like CodeIgniter) before launching. We would reasonably be able to do that in < 10 days. Problem is, they don't think php would be a valid long-term solution anyway, so they would prefer to just let it be and fix the bugs for now (there's quite a bit) and then directly switch to some ruby/python based system. Porting to CI now will make future improvements incredibly easier, the current code more secure, changing the style - still being discussed with the designers - a breeze (reminder: there are database calls in template files right now); the biggest obstacle is the lack of trust in php as a valid, scalable technology. So well, I need some examples of great php applications (apart from facebook) and some suggestions on how to try to convince them to port soon. Again, they're great people - it's not like they would like ruby cause it's so hot right now; they just don't trust php since us cool programmers like bashing it, I suppose, but I'm sure going on like this for even one more day would be a mistake. Also, we have some weight in the decision process.

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• Setting up a shared media drive

  - by Sam Brightman

  I want to have a shared media drive be transparently usable to all users, whilst also sticking to FHS and Ubuntu standards. The former takes priority if necessary. I currently mount it at /media/Stuff but /media is supposed to be for external media, I believe. The main issue is setting permissions so that access to read and write to the drive can be granted to multiple users working within the same directories. InstallingANewHardDrive seems both slightly confused and not what I want. It claims that this sets ownership for the top-level directory (despite the recursion flag): sudo chown -R USERNAME:USERNAME /media/mynewdrive And that this will let multiple users create files and sub-directories but only delete their own: sudo chgrp plugdev /media/mynewdrive sudo chmod g+w /media/mynewdrive sudo chmod +t /media/mynewdrive However, the group writeable bit does not seem to get inherited, which is troublesome for keeping things organised (prevents creation inside sub-folders originally made by another user). The sticky bit is probably also unwanted for the same reason, although currently it seems that one userA (perhaps the owner of the mount-point?) can delete the userB's files, but not vice-versa. This is fine, as long as userB can create files inside the directory of userA. So: What is the correct mount point? Is plugdev the correct group? Most importantly, how to set up permissions to maintain an organised media drive? I do not want to be running cron jobs to set permissions regularly!

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