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• How to address an EC2 instance from both inside and outside datacenter?

  - by Alexandr Kurilin

  I'm trying to find a good way of being able to address my EC2 database instance from both inside and outside of the datacenter. Other EC2 instances need to be able to call into it, and other clients like pgAdmin might need to connect to it from the outside world as well. It's my understanding that using the internal and external DNS names is sustainable long term as each reboot leads to a change. I'm thinking of associating an Elastic IP with the instance and giving it an A record (say db1.mydomain.com) which I then will use both within and outside the datacenter. Further instances in the same role will get the same treatment and a DNS record of db2.mydomain.com etc. Now, is there a cleaner and more stable way of achieving this result? Am going about this the wrong way? Suggestions?

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• How can I refresh/reinstall/clear/set-to-default my bootup process?

  - by Tchalvak

  I'm currently having a problem with my bootup process that is growing progressively worse as time goes on: While booting, it does a few minutes of hard-drive reading. During that, instead of showing a boot splash screen, it shows various dashes and dots, as if the video card isn't recognizing. The splash screen actually has colors similar to the splash screen (purple), it simply is garbled. It then does a few minutes of hard-drive reads, and if I leave it long enough, sometimes it boots into the desktop (and auto-logs-in). Sometimes, unfortunately, it just hangs on that garbled screen and reads from the hard-drive forever. Notably, I've also stopped being able to access grub during bootup (perhaps it is just not displayed correctly by the video, hard to tell). This is a symptom that has grown over the course of various ubuntu upgrades, at least I suspect that the upgrade process is leaving behind cruft. So, is there a safe way for me to "refresh" the boot system so that it is clean, new, fast, and reliable? For example, to test out a cleanly configured boot, make sure that it works (try before I buy), and then apply it to the system to eliminate as much of this problem as possible? Edit: Here is the requested bootchart: http://imgur.com/9jocF

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• Java Champion Dick Wall Explores the Virtues of Scala (otn interview)

  - by Janice J. Heiss

  In a new interview up on otn/java, titled “Java Champion Dick Wall on the Virtues of Scala (Part 2),” Dick Wall explains why, after a long career in programming exploring Lisp, C, C++, Python, and Java, he has finally settled on Scala as his language of choice. From the interview: “I was always on the lookout for a language that would give me both Python-like productivity and simplicity for just writing something and quickly having it work and that also offers strong performance, toolability, and type safety (all of which I like in Java). Scala is simply the first language that offers all those features in a package that suits me. Programming in Scala feels like programming in Python (if you can think it, you can do it), but with the benefit of having a compiler looking over your shoulder and telling you that you have the wrong type here or the wrong method name there.The final ‘aha!’ moment came about a year and a half ago. I had a quick task to complete, and I started writing it in Python (as I have for many years) but then realized that I could probably write it just as fast in Scala. I tried, and indeed I managed to write it just about as fast.”Wall makes the remarkable claim that once Java developers have learned to work in Scala, when they work on large projects, they typically find themselves more productive than they are in Java. “Of course,” he points out, “people are always going to argue about these claims, but I can put my hand over my heart and say that I am much more productive in Scala than I was in Java, and I see no reason why the many people I know using Scala wouldn’t say the same without some reason.”Read the interview here.

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• C# 4.0 Optional/Named Parameters Beginner&rsquo;s Tutorial

  - by mbcrump

  One of the interesting features of C# 4.0 is for both named and optional arguments.  They are often very useful together, but are quite actually two different things.  Optional arguments gives us the ability to omit arguments to method invocations. Named arguments allows us to specify the arguments by name instead of by position.  Code using the named parameters are often more readable than code relying on argument position.  These features were long overdue, especially in regards to COM interop. Below, I have included some examples to help you understand them more in depth. Please remember to target the .NET 4 Framework when trying these samples. Code Snippet using System;   namespace ConsoleApplication3 {     class Program     {         static void Main(string[] args)         {               //C# 4.0 Optional/Named Parameters Tutorial               Foo();                              //Prints to the console | Return Nothing 0             Foo("Print Something");             //Prints to the console | Print Something 0             Foo("Print Something", 1);          //Prints to the console | Print Something 1             Foo(x: "Print Something", i: 5);    //Prints to the console | Print Something 5             Foo(i: 5, x: "Print Something");    //Prints to the console | Print Something 5             Foo("Print Something", i: 5);       //Prints to the console | Print Something 5             Foo2(i3: 77);                       //Prints to the console | 77         //  Foo(x:"Print Something", 5);        //Positional parameters must come before named arguments. This will error out.             Console.Read();         }           static void Foo(string x = "Return Nothing", int i = 0)         {             Console.WriteLine(x + " " + i + Environment.NewLine);         }           static void Foo2(int i = 1, int i2 = 2, int i3 = 3, int i4 = 4)         {             Console.WriteLine(i3);         }     } }

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• Two Copies of "Silverlight 5 In Action" to Give Away and a FREE chapter!

  - by Dave Campbell

  I know most of you have seen my post from Tuesday where I talked about giving away 2 copies of Pete's book on Monday morning July 18th. Well... I'm repeating it, because it's a smoking deal... for the cost of an email you too can take a shot at getting Pete's latest released "Silverlight 5 In Action" free. 2 Important Pieces of Information 1) The deadline: midnight Sunday night, July 17, 2012, Arizona time... if you know me, you know I've lived here too long and am timezone stupid... so don't make me calculate it out :) 2) The how: I have a special email address for submittals: mailto:[email protected]?Subject=Giveaway. 3) oh yeah... I lied about only 2 pieces of info... number 3 ... there may be other surprises on Monday morning... 'nuff said 4) and just to pump up the volume on the book... how about a Free chapter you can read right here on Working with RSS and Atom! 5) send me an email and Stay in the 'Light!

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• Enforcing Constraints Upon Data Documents of Various Formats

  - by Christopher Berman

  This seems like the sort of problem that must have been solved elegantly long ago, but I haven't the foggiest how to google it and find it. Suppose you're maintaining a large legacy system, which has a large collection of data (tens of GB) of various formats, including XML and two different internal configuration formats. Suppose further that there are abstract rules governing the values these files may or may not contain. EXAMPLE: File A defines the raw, mathematical data pertaining to the aerodynamics of a car for consumption of the physics component of the system. File B contains certain values from File A in an easily accessible, XML hierarchy for consumption of a different component of the system. There exists, therefore, an abstract rule (or constraint) such that the values from File B must match the values from File A. This is probably the simplest constraint that can be specified, but in practice, the constraints between files can become very complicated indeed. What is the best method for managing these constraints between files of arbitrary formats, short of migrating it over to an RDBMS (which simply isn't feasible for the foreseeable future)? Has this problem been solved already? To be more specific, I would expect the solution to at least produce notifications of violated constraints; the solution need not resolve the constraints. ============================== Sample file structures File A (JeepWrangler2011.emv): MODEL JeepWrangler2011 { EsotericMathValueX 11.1 EsotericMathValueY 22.2 EsotericMathValueZ 33.3 } File B (JeepWrangler2011.xml): <model name="JeepWrangler2011"> <!--These values must correspond File A's EsotericMathValues--> <modelExtent x="11.1" y="22.2" z="33.3"/> [...] </model>

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• Is it bad to put your computer in sleep mode every time? [closed]

  - by Ivo Flipse

  Possible Duplicate: What is the effect of always sleeping a laptop? Is it bad for batteries or something else? Often I have a lot of stuff open and don't feel like shutting down my laptop, so I just use sleep mode when I'm transferring it. But I have no idea if this might have any disadvantages. So my question is: is it bad to put your computer in sleep mode every time? Things I'm wondering: Should I turn off my computer every once in a while? Will continuous use of sleep mode slow down my system in any way? Are there any bad side effects (in the long term)? Any thoughts? FYI I'm using Windows 7 on a laptop

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• SMTP server to deliver mail to Rails app, how?

  - by Gunchars

  all, this is my first question and I hope I chose the right place to post it. Here's what I need help with: I've been looking for this all day and I'm having a hard time finding a SMTP mail server that would fit the following criteria: lightweight, does one thing and does it good is able to route and deliver local mail to a Rails application The second point could be accomplished in any number of ways. I'm running a VPS, so I have full freedom in how to implement this. It could, for example, put messages straight in the db, pipe them to a helper program that would then process them accordingly or also save messages in a mbox file and run a script after every received message. I'm building a small site so the traffic is not going to be a problem. If there are alternative ways to deliver messages to a Rails app, I'd gladly hear about them. Thank you. EDIT: After long searching, I think I've found what I was looking for. Exim is a mail server that can deliver local mail to pipes. Also, Rails 3 and ActionMailer can make it really easy to process the incoming mail. More info here: http://www.exim.org/exim-html-current/doc/html/spec_html/ch29.html http://guides.rubyonrails.org/action_mailer_basics.html#receiving-emails

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• Use DOS batch to move all files up 1 directory

  - by Harminoff

  I have created a batch file to be executed through the right-click menu in Win7. When I right-click on a folder, I would like the batch file to move all files (excluding folders) up 1 directory. I have this so far: PUSHHD %1 MOVE "%1\*.*" ..\ This seems to work as long as the folder I'm moving files from doesn't have any spaces. When the folder does have spaces, I get an error message: "The syntax of the command is incorrect." So my batch works on a folder titled PULLTEST but not on a folder titled PULL TEST. Again, I don't need it to move folders, just files. And I would like it to work in any directory on any drive. There will be no specific directories that I will be working in. It will be random. Below is the registry file I made if needed for reference. Windows Registry Editor Version 5.00 [HKEY_CLASSES_ROOT\Directory\shell\PullFiles] @="PullFilesUP" [HKEY_CLASSES_ROOT\Directory\shell\PullFiles\command] @="\"C:\\Program Files\\MyBatchs\\PullFiles.bat\" \"%1\""

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• How much the distance and ms can affect on the download speed ?

  - by Prix

  Let's consider A (client) and B (server) where A makes download from B. How much can a bad routing from A to B affect the download speed ? For example A does a tracert to B and get a response of 10 steps where the avg ms is around 300 with 10% packet loss at the 4 step and when the connection is normal the avg from A to B is 10 ~ 30 ms. Could this sort of impact reduce A download speed drasticaly or as long as both side and routes have enough link for the full speed of A from B and vice-versa it should maintain the same speed ? Besides tracert and the ping analyse of A to B what else is used to identify the problem ? If you need extra information please let me know.

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• A Quarter Century of SPARC

  - by kemer

  You might have missed an interesting milestone: the 25th anniversary of SPARC. Twenty-five years! Almost 40% of my life: humbling, maybe a little scary. When I joined Sun Microsystems in 1988, SPARC was just starting to shake things up. The next year we introduced the SPARCstation 1, which had basically triple the performance of our Motrolla-based Sun–3 systems. Not too long after that, our competition began a campaign of “SPARC is dead.” We really distressed them with our success, in spite of our small size. “It won’t last.” “It can’t last!” So they told themselves. For a stroll down memory lane take a look at this page. I remember the sales meeting we had in Atlanta to internally announce the SPARCstation 1. Sun hadn’t really hit the big times, yet. Our much bigger competitors viewed us as an ill-mannered pest, certain of our demise. And, why wouldn’t they be certain: other startups more our size, such as Apollo (remember them?), Silicon Graphics (they fought the good fight!), and the incredibly cool Symbolics are memories. Wait! There was also a BIG company, DEC, who scoffed at us: they are history, too. In fact, we really upset them with what was supposed to be an internal-only video production that was a take-off on Bruce Lee movies, in which we battled the evil Doctor DEC – complete with computer mice (or is that “mouses”?) wielded like nun chucks with the new SPARCstation 1 somehow in the middle of everything. The memory is vivid, but the details hazy. After all, that was almost a quarter century ago. So, here’s to Oracle’s SPARC: still going strong after all these years. – Kemer

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• Hyperlink to doc file slow opening

  - by mserioli

  I've two excel file with inside some link to .doc and .pdf file. Both excel files and linked files are on a network shared folder. The first excel file is an .xls, the second an .xlsm. While opening link to .pdf file is very fast (the file is open in few seconds) it take a long time to open .doc files (about 40 secs.). I have searched on internet but found no solution at the moment. I have this problem with both excel 2007 and 2010. Does anyone know how to solve this problem? Thanks a lot Marco

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• Oracle Users - Are You Ready?!?!?

  - by Oracle OpenWorld Blog Team

   By Karen Shamban At long last, it's time for Oracle OpenWorld 2012 to begin. After months of planning by attendees and at Oracle, the conference is about to begin. What's happening on the first day, Sunday, September 30? Registration Moscone West, Moscone South, and Hilton San Francisco, 7:00 a.m. - 8:00 p.m. Westin St. Francis, 3:00 p.m. - 6:30 p.m. Oracle University Pre-Conference Training Hotel Nikko and Hilton San Francisco, 8:00 a.m. - 3:30 p.m. Oracle Users Forum Moscone West, 8:00 a.m. - 4:30 p.m. Oracle OpenWorld Opening Keynote, featuring Oracle CEO Larry Ellison Moscone North Hall D, 5:00 p.m. - 7:00 p.m. Oracle OpenWorld Welcome Reception sponsored by Fujitsu Howard Street Tent and Yerba Buena Gardens, 7:00 p.m. - 8:30 p.m. Oracle OpenWorld Music Festival Various times and locations It's never too late to attend Oracle OpenWorld - hope to see you there!

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• Windows 7 Index Search does not work in Google Drive folder

  - by Joel

  I recently installed Google Drive on my Windows 7 laptop and began syncing all my files a few days ago. All was well until I needed to search for some documents in my local copy of Google Drive using Windows 7 Search feature. Windows did not return any results at all. Weirdly, when I turned off Windows indexing for that folder, it began returning results. I don't mind using windows search w/o the index but sometimes it takes too long to search (especially for keywords inside documents like Word and Excel). It's driving me nuts to the point where I have given up on Windows Search and switched to Google Drive's online search to look for files (not as convenient as I still have to go back go google drive in Windows to locate the folder). Any help appreciated!

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• See network computer description in Explorer

  - by John Gardeniers

  When viewing the list of network computers in Windows Explorer on a Win 7 machine there appears to be no way of readily seeing the description field, which makes that pretty well useless. I believe this problem started with Vista but I'm seeing it for the first time because I was fortunate enough to skip over Vista. We're currently rolling out Win 7 on new boxes and although I'm changing the naming system to something more sensible, the old boxes have names such as FWS01, FWS02, etc. Managing a network of computers with such names is made more difficult when you can't readily see who's machine each one is. Googling the problem brought up a workaround involving creating a shortcut on an XP machine and copying that to the Win 7 box but that's a long way from ideal. Is there some kind of hack that can be applied to machines, the operator of which needs to be able to see the description field?

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• How can I change ACLs recursively using cacls.exe?

  - by maaartinus

  I want to restrict the access for everything inside the work directory to me and the system only. I tried this with the following command: cacls.exe work /t /p 'PIXLA09\Maaartin:f' 'NT AUTHORITY\SYSTEM':f However it doesn't work at all. The following command should show only the two specified users but instead shows a very long list of permissions: cacls.exe work/somedirectory I tried to use /g instead of /p, too. Since I didn't use /e the permissions shouldn't get edited but replaced. Any ideas what's wrong?

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• Switching PHP to FastCGI from mod_php broke AMFPHP

  - by wezzy

  Hi, i've just switched my debian server from mod_php to fastcgi following this tutorial everything goes right but now i've found that one of the hosted application that using AMFPHP for flash remoting is broken. I'm trying to understand what's happend. Looking at it with FireBug and FireAMF it seems that the responses has a content but the Flash callbacks never get called and if i try to open the service browser it displays this error: (mx.rpc::Fault)#0 errorID = 0 faultCode = "Client.Error.RequestTimeout" faultDetail = "The request timeout for the sent message was reached without receiving a response from the server." faultString = "Request timed out" message = "faultCode:Client.Error.RequestTimeout faultString:'Request timed out' faultDetail:'The request timeout for the sent message was reached without receiving a response from the server.'" name = "Error" rootCause = (null) It's strange it seems that the server takes a long time to responde, then (in the service browser) flash made a new call to the server and the old one get a response. Some problem with sessions ? Really no idea ....

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• Remote access not working without connected monitor

  - by winSharp93

  I am trying to configure a Windows Server 2008 as a Home Server for my personal use (mainly for storing documents, hosting source-control, etc.). The "server" consists of an Intel Atom 2700DC board and an Intel SSD. Configuring remote access to the server, I am confronted with a very strange problem: As long as a monitor is connected to my server, remote access works without any problems. However, when no monitor is connected at boot-time, remote access simply won't work (I keep getting errors when trying to connect that the remote server was not found or that remote access is disabled). Windows definitely boots when no monitor is connected as I receive a message asking me whether to enter safe mode when booting after powering the server down by plugging the power cord. When I plug in a monitor after boot, it stays turned off and remote desktop connections still fail. Do you have any ideas about what I could try?

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• Graduating soon with a computer science degree, but have unique circumstances [closed]

  - by Donnie

  I joined the Navy in 1998, and was admitted into Nuclear Power Training. I got my electrician's mate certificate, but was put on medical hold when I was in Nuclear Power Training. I was sent to the Naval Hospital, and received a medical (honorable) discharge in the middle of 2000. I decided to stay at home and raise my son, and my girlfriend worked. a few years ago, I decided that I want to work as a programmer, so I went to college and will soon be graduating with a degree in computer science. I hope to finish with a relatively high GPA, 3.8 or 3.9. My question is this: How much, if any, of my Navy experience should I put on my resume? And how do I explain my nine year gap as a stay at home dad? Do I even try to explain it? I know recent college graduates typically have no experience, but obviously I'm not the typical college graduate. Will my long absence from working, or my relatively short duration in the Navy hurt my chances? Should I just put the college on my resume, and hope that HR thinks I'm younger than I am? Obviously, then, my age would show at the interview and there would be questions. Any help is appreciated.

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• Running "ipconfig /displaydns" in cmd prompt still displays results even after I run "ipconfig /flushdns"

  - by 400_THE_CAT

  Whenever I run "ipconfig /displaydns" I get a long list of sites even after running "/flushdns." I thought my results should be empty considering /flushdns. Is this normal behavior? I also noticed that after I run /flushdns and browse the internet for a couple of hours, my list of cached sites doesn't really change. Google.com, for example isn't on the list but a bunch of sites I've never visited do show up in my DNS cache. Can someone explain this?

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• How to delete system default printer forms?

  - by matt wilkie

  On Windows there are system default printer forms which can't be deleted from the Print Server Properties dialog. Is there some other way they can be removed? We are never going to use page sizes like Envelope, B5(JIS), US Std Fanfold, etc. and I'd like to save users (and myself!) from having to scroll through a big long list of noise. Our print servers are Windows Server 2003 if that makes any difference. thanks.

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• Internet Timeouts with TP-Link TL-WN821N v2 wireless usb stick

  - by user1622959

  A short time after accessing the internet, the browser/download times out. Before the timeout, the internet works OK briefly; afterwards, the wireless is still connected with a strong signal, but every internet access results in a timeout. When I leave the PC for a while, the internet is back just to timeout again as soon as I start using it. The same happens when I reconnect to the router. Also, when I surf the internet, it takes a couple of minutes until the timeout, but when I download something, it times out in a matter of seconds. The wireless adapter works just fine in Windows and internet via ethernet cable works just fine in Ubuntu. Does anyone have the same problem or knows a solution. I use Ubuntu 12.10 x64. The problem occurs since I installed ubuntu (which was a few days ago). Here some stuff that might be usefull: serus@serus-Ubuntu-PC:~$ lsusb Bus 002 Device 002: ID 0cf3:1002 Atheros Communications, Inc. TP-Link TL-WN821N v2 802.11n [Atheros AR9170] serus@serus-Ubuntu-PC:~$ lsmod Module Size Used by carl9170 82083 0 serus@serus-Ubuntu-PC:~$ modinfo carl9170 filename: /lib/modules/3.5.0-21- generic/kernel/drivers/net/wireless/ath/carl9170/carl9170.ko alias: arusb_lnx alias: ar9170usb firmware: carl9170-1.fw description: Atheros AR9170 802.11n USB wireless serus@serus-Ubuntu-PC:~$ iwconfig wlan0 IEEE 802.11bgn ESSID:"virginmedia0137463" Mode:Managed Frequency:2.462 GHz Access Point: A0:21:B7:F8:29:B6 Bit Rate=240 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=66/70 Signal level=-44 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:1399 Invalid misc:18 Missed beacon:0 serus@serus-Ubuntu-PC:~$ sudo lshw -C network *-network description: Wireless interface physical id: 1 bus info: usb@2:2 logical name: wlan0 serial: 00:27:19:bb:00:19 capabilities: ethernet physical wireless configuration: broadcast=yes driver=carl9170 driverversion=3.5.0-21-generic firmware=1.9.4 ip=192.168.0.6 link=yes multicast=yes wireless=IEEE 802.11bgn

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• is there a way to prespecify to overwrite files with same name?

  - by Celeritas

  Connections to network drives are ridiculously slow (e.g. 15kb/sec on really good days) and when I'm copying files I leave my desk. My problem is when there is a file with the same name to be overwritten, is there a way to specify in advanced to overwrite files? I know it has the option "do same for next x conflicts" but that doesn't popup until (in some cases) a long time after the files start copying. See my dilemma? Example: copying 500 files, estimated time 2 hours, I leave, after 10 minutes message comes up about file with same name and asks if it should overwrite (in this time copying stalls), I come back 30 minutes latter to find only the files in the 10 minutes copied. Out of curiosity how could the network speed be so bad? I asked the boss and he said because it gets routed around a lot and is just bad :(

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• WGet or cURL: Mirror Site from http://site.com And No Internal Access

  - by alharaka

  I have tried wget -m wget -r and a whole bunch of variations. I am getting some of the images on http://site.com, one of the scripts, and none of the CSS, even with the fscking -p parameter. The only HTML page is index.html and there are several more referenced, so I am at a loss. curlmirror.pl on the cURL developers website does not seem to get the job done either. Is there something I am missing? I have tried different levels of recursion with only this URL, but I get the feeling I am missing something. Long story short, some school allows its students to submit web projects, but they want to know how they can collect everything for the instructor who will grade it, instead of him going to all the externally hsoted sites.

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• Html 5 clock, part ii - CSS marker classes and getElementsByClassName

  - by Norgean

  The clock I made in part i displays the time in "long" - "It's a quarter to ten" (but in Norwegian). To save space, some letters are shared, "sevenineight" is four letters shorter than "seven nine eight". We only want to highlight the "correct" parts of this, for example "sevenineight". When I started programming the clock, each letter had its own unique ID, and my script would "get" each element individually, and highlight / hide each element according to some obscure logic. I quickly realized, despite being in a post surgery haze, …this is a stupid way to do it. And, to paraphrase NPH, if you find yourself doing something stupid, stop, and be awesome instead. We want an easy way to get all the items we want to highlight. Perhaps we can use the new getElementsByClassName function? Try to mark each element with a classname or two. So in "sevenineight": 's' is marked as 'h7', and the first 'n' is marked with both 'h7' and 'h9' (h for hour). <div class='h7 h9'>N</div><div class='h9'>I</div> getElementsByClassName('h9') will return the four letters of "nine". Notice that these classes are not backed by any CSS, they only appear directly in html (and are used in javascript). I have not seen classes used this way elsewhere, and have chosen to call them "marker classes" - similar to marker interfaces - until somebody comes up with a better name.

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