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• How does landscape calculate memory usage?

  - by David Planella

  I'm trying to debug an OOM situation in an Ubuntu 12.04 server, and looking at the Memory graphs in Landscape, I noticed that there wasn't any serious memory usage spike. Then I looked at the output of the free command and I wasn't quite sure how both memory usage results relate to each other. Here's landscape's output on the server: $ landscape-sysinfo System load: 0.0 Processes: 93 Usage of /: 5.6% of 19.48GB Users logged in: 1 Memory usage: 26% IP address for eth0: - Swap usage: 2% Then I ran the free command and I get: $ free -m total used free shared buffers cached Mem: 486 381 105 0 4 165 -/+ buffers/cache: 212 274 Swap: 255 7 248 I can understand the 2% swap usage, but where does the 26% memory usage come from?

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• What do DBAs do?

  - by Jonathan Conway

  Yes, I know they administrate databases. I asked this question because I'd like to get a further insight into the kind of day-to-day duties a DBA might perform, and the real-world business problems they solve. For example: I optimized a 'products' query so that it ran 25% faster, which made the overall application faster. Is this a typical duty? Or is there more to being a DBA than simply making things faster? In what situations does DBA work involve planning and creativity?

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• HTTPS on all pages where user is logged on

  - by Tom Gullen

  I know this is considered best practise to prevent cookie hijacking. I would like to adopt this approach, but ran across a problem on our forum where the users post images which either aren't posted with URL's over HTTPS or the url itself doesn't support HTTPS. This throws up a lot of ugly browser warnings. I see I have two options: Disable HTTPS for the forum Force all user posted content to start with // in the url so it selects the right protocol, if it doesn't support HTTPS so be it Do I have any other options? How do other sites deal with this?

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• How Microsoft Lost the API War - by Joel Spolsky

  - by TechTwaddle

  Came across another gem of an article by Joel Spolsky. It's a pretty old article written in June of 2004, has lot of tidbits and I really enjoyed reading it, so much in fact that I read it twice! So hit the link below and give it a read if you haven't already, How Microsoft Lost the API War - Joel Spolsky excerpt, "I first heard about this from one of the developers of the hit game SimCity, who told me that there was a critical bug in his application: it used memory right after freeing it, a major no-no that happened to work OK on DOS but would not work under Windows where memory that is freed is likely to be snatched up by another running application right away. The testers on the Windows team were going through various popular applications, testing them to make sure they worked OK, but SimCity kept crashing. They reported this to the Windows developers, who disassembled SimCity, stepped through it in a debugger, found the bug, and added special code that checked if SimCity was running, and if it did, ran the memory allocator in a special mode in which you could still use memory after freeing it."

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• Ubuntu black screen and icons messed up 12.04

  - by user69869

  I had a successful install when i updated from 11.10 but when i actually went to start it it hanged and the purple screen for a few seconds then flickered my boot screen then showed the desktop i cant interact its black i can see the icons marked out but no images they are just gray wireless doesnt connect it seems that it messed up all the drivers. i tried to stat the old version i had its the same exept i can interact most window close buttons are missing and most of the time it doesnt know what screen im on. any ideas on what i can do? oh and recovery mode shows alot of errors and doesnt do much i ran it for the old version and it just goes through failing and gives an error beep. Thanks in advance any advice is appreciated (note windows still works fine on this system... unfortunately ;D )

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• BASH Scripting: Check If running with sudo/superuser, if not, dont run, return error

  - by EvilPhoenix

  This is something I've been curious about. I make a lot of small bash scripts (.sh files) to do tasks that I routinely do. Some of those tasks require everything to be ran as superuser. I've been curious: Is it possible to, within the BASH script prior to everything being run, check if the script is being run as superuser, and if not, print a message saying You must be superuser to use this script, then subsequently terminate the script itself. The other side of that is I'd like to have the script run when the user is superuser, and not generate the error. Any ideas on coding (if statements, etc.) on how to execute the aforementioned?

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• Addressing a variable in VB

  - by Jeff

  Why doesn't Visual Basic.NET have the addressof operator like C#? In C#, one can int i = 123; int* addr = &i; But VB has no equivalent counter part. It seems like it should be important. UPDATE Since there's some interest, Im copying my response to Strilanc below. The case I ran into didnt necessitate pointers by any means, but I was trying to trouble shoot a unit test that was failing and there was some confusion over whether or not an object being used at one point in the stack was the same object as an object several methods away.

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• SPRoleAssignment Crazy Caviats

  - by MOSSLover

  I’m not sure if this bug exists on any other environment, but here are a few issues I ran into when trying to use SPRoleAssignment and SPGroup: When trying to use Web.Groups[“GroupName”] it basically told me the group did not exist, so I had to change the code to use Web.SiteGroups[“GroupName”]. I could not add the Role Assignment to the Web and run a Web.Update() without adding an additional Web.AllowUnsafeUpdates= true; , however on my virtual machine I could do a Web.Update() without the extra piece of code.  I kept receiving an error in my browser stating that I should hit the back button and update my permissions. So after fixing those two issues I was able to copy the permissions from a page item into a Site for my migration.  Hopefully, one of you can learn from my error messages if you have any issues in the future. Technorati Tags: SPRoleAssignment,MOSS,SPGroup

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• MYSQL – Detecting Current Version of MySQL Server Installation

  - by Pinal Dave

  Here is one of the most popular questions which I receive which is related to MySQL installation. The question is how do I know which version of the MySQL I have installed on my server. Here is the simple trick which works all the time. Connect to your MySQL engine with the help of Command Prompt or MySQL Workbench. When you execute the following command it will give us all the necessary information related to MySQL Version. SHOW VARIABLES LIKE "%version%"; Here is the screenshot of the result which I receive when I ran above command on my Test Server. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: MySQL, PostADay, SQL, SQL Authority, SQL Query, SQL Tips and Tricks, T SQL

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• Hot to get XChat to trust CA certificate?

  - by Silvio

  I have created an SSL certificate authority including a sub-authority to issue certificates. I have copied the root certificate to /usr/share/ca-certificates/extra and added it to /etc/ca-certificates, then ran dpkg-reconfigure ca-certificates and update-ca-certificates. After it said "Adding debian:.pem done." I am now fairly convinced that Ubuntu knows about my CA. Now I issued a certificate for the ZNC irc bouncer from the subca, installed it onto znc, but XChat will not trust the certificate despite all the above. I also issued a certificate to use with apache2 and that one works fine after adding the root ca to chromium. Does someone know how I can get XChat to trust the certificate?

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• R2 and Idera Idera SQL Safe (Freeware Edition)

  - by DavidWimbush

  Good news: the Freeware edition of Idera SQL Safe works on R2. You might not care but I certainly do. Here's why:  In September last year I started using Idera SQL Safe (the Freeware Edition) to get backup compression on my SQL 2005 servers. It seemed like a good idea at the time - it was free and my backups ran much faster and took up much less disk space. I really thought I'd actually scored a free lunch. Until they discontinued the product. I was thinking about what to do when I heard that R2 Standard would include native backup compression so I've just been keeping my fingers crossed since then. So I installed R2 Developer on my laptop, installed SQL Safe and kicked off a restore with it. No problem. Phew! Now I won't have to do a special, non-compressed backup and restore when we migrate.

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• Eclipse Juno, need root access everytime I change the configuration

  - by veepsk

  I am trying to install eclipse Juno on 12.04. I did all the things instructed in this link. But whenever I install any new software (Say CDT or Pydev) on Eclipse, the new softwares are gone upon opening the Eclipse app again. I then have to open Eclipse again with root privileges to install all the software. I also ran into many problems with linking the include library for Eclipse CDT. Can anyone help me with installing Juno in a way that I do not need root access every time I change configurations in Eclipse?

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• Windows Phone 7 DatePicker gotcha

  - by David Turner

  The Silverlight Toolkit for Windows Phone adds some great extra controls for Windows Phone 7, one gotcha that I ran into was that the DatePicker Application Bar icons don’t show up unless you include them in your project. The problem is that your DatePicker ends up looking like this: Tim Heuer mentions this in his blog post about the Silverlight Toolkit for WP7, and as he says, it is documented in the source code: So the problem is that the icons can’t be referenced from the Silverlight Toolkit Assembly, and the solution is that you have to add them to you project in the ‘well known’ / pre-defined location of a top level folder in your project called Toolkit.Content, and you must make sure to mark the icons with a Build Action of  ‘Content’ otherwise it wont work: The result is that your DatePicker will now look like this:

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• Display folder sizes in file manager

  - by wim

  In nautilus (or nemo) file manager, the "Size" column shows the filesize for files and the number of items contained in a folder for subdirectories: Number of items is not that important for me, it would be more useful if I could make this column show the total size contained under the directory. I had an extension on windows called foldersize which shows what I mean: I think it involved a service which ran in the background monitoring filesystem modifications in order to make sure the column was kept up to date. I am interested to know if there is any similar extension to nautilus, I would also be open to switching to another file manager to get this functionality. I am aware of the Disk Usage Analyser in Ubuntu, but what I'm looking for is a solution with file manager integration.

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• Apache 2.4 PHP 5.4 mysql not found?

  - by jurchiks

  Just tried setting up the latest Apache (2.4.1 x86 VC10 from apachelounge) and PHP (5.4 VC9 TS X86, with the php5apache2_4.dll) on my PC and ran into this weird problem; in my php.ini I have enabled all of the following: extension=php_mysql.dll extension=php_mysqli.dll extension=php_pdo_mysql.dll but when I try to print the available PDO's using this: print_r(PDO::getAvailableDrivers()); It gives me an empty array. PhpMyAdmin and MantisBT also refuse to work, saying that the mysql extension is missing. phpinfo() gives this: PDO PDO support enabled PDO drivers no value and when searching for mysql, only the mysqlnd section pops up... The DLLs are there in the D:/php/ext folder and no errors pop up when starting up Apache, as well as no errors in the Windows Event Log, and PHP itself has no error log anyway. What could possibly be the problem with this? Before this I had Apache 2.2.22 from apachelounge and PHP 5.3.9 and I had no problems. Now nothing works...

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• Recover partition after GParted resizing interrupted by unexpected shutdown

  - by user84207

  As I was resizing my partitions using GParted, my laptop battery ran out, and the process was interrupted. Now, I am unable to mount the partition which I was trying to resize. I get the following error when I click to mount the partition on nautilus: Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda3, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so How can I go about recovering my data? Is there a safe way to attempt to force-mount the partition in question? Any help towards recovering my data is sincerely appreciated.

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• Silverlight TV 19: Hidden Gems from MIX10, UFC's Multi-Touch App

  John ran into Silverlight MVP Ward Bell of IdeaBlade while at MIX10 (how could anyone miss him!). Ward was kind enough to sit and talk with John to show off the multi-touch application his company wrote for UFC using Silverlight. It uses multi-touch, Caliburn, MVVM, and, of course, Silverlight! Relevant links: John's Blog Ward's Blog Silverlight 4 RC Features (or download here) Follow us on Twitter @SilverlightTV Learn more about Silverlight with the new Silverlight Training Course...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Access denied error when adding new server to existing SharePoint 2007 Farm

  - by Kelly Jones

  I recently got an error when adding a new SharePoint 2007 (SP2) server to our existing MOSS farm.  I had run the installation fine, and was walking through the SharePoint Configuration Wizard, when I got an error on step 2: “Resource retrieved id PostSetupConfigurationFailedEventLog is Configuration of SharePoint Products and Technologies failed.” I searched the net, but didn’t really find anything. I then remembered that I had forgotten to run the latest SharePoint updates (for us, the latest applied was December 2009).  I installed the WSS update, and then the MOSS update and both worked fine.  I then ran the Configuration wizard again and it worked without any errors.

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• Does seeding torrents affect the harddisk RAM caching?

  - by satuon

  I've downloaded a lot of torrent files and while I'm seeding them, I've noticed that very often when I start the browser it's slow and the hard disk activity indicator is on. Usually when I start a program it gets cached in RAM and starting it again is very quick, and I have 3 GB of RAM so usually it stays cached nearly forever. But when my torrent client is seeding it seems that after an hour programs that I ran are no longer cached in RAM. I was thinking maybe it's because of the disk reads which the torrent client performs are cached and fill up RAM eventually. But I don't think they need to be, as they are read only once and are unlikely to be read again soon. So my questions are - is this the way I think, and if so is it possible in principle to prevent the disk reads from being cached? I can try to edit the source code of the program.

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• I need to develop a parser. Can I use Lex and Yacc for the purpose?

  - by Scrooge

  I need to extract very particular data from log files(of different types and formats). Since I am a recent college passout; my mind ran to using Lex and Yacc for the purpose. Now I have the following Questions 1. Will it be legal to do so ? (This product I am working for belongs to one of the biggest tech companies in the world.) 2. Also ; I would like to know if I am being too afraid to write my own parser? 3. How can I use Lex and Yacc if my product is Windows based? Please tell me if you need any clarification or extra information.

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• Testing with Profiler Custom Events and Database Snapshots

  We've all had them. One of those stored procedures that is huge and contains complex business logic which may or may not be executed. These procedures make it an absolute nightmare when it comes to debugging problems because they're so complex and have so many logic offshoots that it's very easy to get lost when you're trying to determine the path that the procedure code took when it ran. Fortunately Profiler lets you define custom events that you can raise in your code and capture in a trace so you get a better window into the sub events occurring in your code. I found it very useful to use custom events and a database snapshot to debug some code recently and we'll explore both in this article. I find raising these events and running Profiler to be very useful for testing my stored procedures on my own as well as when my code is going through official testing and user acceptance. It's a simple approach and a great way to catch any performance problems or logic errors.

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• How Do I interpret HDD S.M.A.R.T Results?

  - by Marty

  My laptop has recently started to become a bit unreliable, and for some reason I started to suspect that my HDD was starting to fail. After a bit of hunting on the internet, I found Ubuntu's Disk Utility in the System menu and ran the long SMART diagnostics from this. However, since the documentation for Disk Utility is very poor (palimpsest?), I'm not sure how to interpret the results: For example, the Read Error Rate is over 50 million (!), yet the Assessment is rated "Good". So would someone mind explaining to me how to interpret the results of these tests (especially the Normalized, Worst, Threshold and Value numbers)? And maybe tell me what they think of the results I got for my HDD? (Thanks)

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• Juju bootstrap, install

  - by Robert G.

  I would like to test MAAS + JUJU + OpenStack (I followed the documentation on maas.ubuntu.org) I already made a test environment: 1 MAAS server wich will also run JuJu 10 KVM servers for Openstack The KVM servers are already in "ready" state in MAAS. I would like to set up JuJu but i could not which is drives me crazy. My environments.yaml: environments: maassrv: type: maas maas-server: 'http://${192.168.1.116}/MAAS/' maas-oauth: 'my-key-from-maas' authorized-keys-path: /root/.ssh/id_rsa.pub admin-secret: 1234 default-series: trusty When I run "juju status -e maassrv` : ERROR Unable to connect to environment "maassrv". Please check your credentials or use 'juju bootstrap' to create a new environment. Error details: environment "maassrv" not found OK, it's right, so i should run juju bootstrap -e maassrv: ERROR environment "maassrv" not found When i run the command without the -e switch: error: no environment specified So, I am stuck here, I already added the required ssh keys to maas too. I ran out of ideas why it isn't working.

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• Linux DD command partition -to- partition

  - by Ben Jackson

  I just used the DD command to copy the contents of one partition over to another partition on another drive, like this: dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=noerror sda2 partition was 66GB and sdb2 was 250GB. I read that by doing this the extra space on the drive I am copying to will be wasted, is this true? I wasn't worried about loosing the extra space for the time being however, I just ran: sudo kill -USR1 (PID) to view the current status of DD and it has written over 66GB of data, will it continue to write data until it gets to 250GB? If so, is there a way to stop the process without corrupting it as waiting for it to write blank space seems like a waste of time.

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• Ubuntu suddenly won't boot on a Mac

  - by emchristiansen

  I installed 11.10 in dual-boot mode following instructions here: https://help.ubuntu.com/community/MactelSupportTeam/AppleIntelInstallation Everything worked fine, until I recently updated from Mac OS 10.6.x to the latest 10.6.x (this was a minor update prompted by OS X). The update made the rEFIt screen disappear, so I ran Boot Repair and reinstalled rEFIt and everything worked. I accidentally left my computer without power while booted into Ubuntu, until it presumably died or hibernated itself. I have been unable to boot into Ubuntu since. I didn't see the GRUB screen when I selected Linux the rEFIt chooser. Then I reinstalled rEFIt and the Linux option disappeared from the rEFIt chooser. This is a link to the boot info collected by Boot Repair: http://paste.ubuntu.com/755543/ Any help would be appreciated, especially an explanation of what all these components are (EFI, MBR, GPT, GRUB), where they live on disk, how the system knows to find each component, and how they relate to each other. Thanks!

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