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• Creating a bootable CD based on Ubuntu Server

  - by 0xC0000022L

  Note: bootable here refers to an Installation CD, not to the El Torito bootable CD standard if narrowly construed, or to a Live CD if widely construed. What tools exist to create a bootable CD based on Ubuntu 12.04? Unlike the Live CD used for the Desktop edition, the Server edition doesn't use Casper and that's exactly what I want. I.e. this question is not about a live CD! I have read InstallCDCustomization, but that only covers preseeding, adding modules etc. What I would like to achieve is rather to build a bootable CD from scratch, preferably based on the kernel of my running system, the bash and other binaries from that running system. I know how to preseed my own installation CD, so I'm comfortable with the tools involved there. However, that skips important parts such as creating the directory structure that is expected on a bootable CD. And that's what I'm looking for. I guess the question could be summed up as: what tools are the Ubuntu build masters using to author the alternate and server installation CDs and where can I find documentation for these? I would prefer doing this on the terminal (because that's how I run the Ubuntu Server installations themselves). But if I need a second machine with GUI to do it, I can certainly live with that.

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• Interpolate air drag for my game?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• Restoring GRUB2 on Software RAID 0 after Windows 7 wiped it using Ubuntu 10.10 LiveCD

  - by unknownthreat

  I have installed Ubuntu 10.10 on my system. However, I need to install Windows 7 back, and I expect that it would alter GRUB and it did. Right now, my partition on my Software RAID 0 looks like this: nvidia_acajefec1 is Ubuntu 10.10 and nvidia_acajefec3 is Windows 7. I've been following some guides around and I am always stuck at GRUB not able to detect the usual RAID content. I've tried running: sudo grub > root (hd0,0) GRUB complains it couldn't find my hard disk. So I tried: find (hd0,0) And it complains that it couldn't find anything. So I tried: find /boot/grub/stage1 It said "file not found". Here's the text from the console: ubuntu@ubuntu:~$ grub Probing devices to guess BIOS drives. This may take a long time. [ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ] grub> root (hd0,0) root (hd0,0) Error 21: Selected disk does not exist grub> find /boot/grub/stage1 find /boot/grub/stage1 Error 15: File not found Fortunately, I got one person suggesting that what I've been trying to do is for GRUB Legacy, not GRUB2. So I went to the suggested website, ** (http://grub.enbug.org/Grub2LiveCdInstallGuide) **try to look around, and try: ubuntu@ubuntu:~$ sudo fdisk -l Unable to seek on /dev/sda This is just the step 2 of the instruction in the http://grub.enbug.org/Grub2LiveCdInstallGuide and I cannot proceed because it cannot seek /dev/sda. However, ubuntu@ubuntu:~$ sudo dmraid -r /dev/sdb: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 /dev/sda: nvidia, "nvidia_acajefec", stripe, ok, 488397166 sectors, data@ 0 So what now? Do you have an idea for how to make fdisk see my RAID array on live cd (Ubuntu 10.10)? Honestly, I am lost, very lost in trying to restore GRUB2 on this software RAID 0 system right now.

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• Nothing happens when I connect my Iphone 3G to my laptop

  - by Allwar

  Hi, how do i connect my iphone to my laptop (ubuntu 10.04) so that i can sync music and be able to look at it as a usb stick? (this is what I want to do but there is a problem.) When i connect it to my laptop nothing happens, it doesn't show up as an ikon or as a mass storage device. My Iphone runs 4.2.1 it's an Iphone 3G and it's not jailbroken for the moment, is that a problem? My laptop is an Asus 1201n ubuntu 10.04 (64-bits) Bus 002 Device 005: ID 05ac:1292 Apple, Inc. iPhone 3G I connected my Ipod Video (30 gb) and that one doesn't appear as well So I'm kind of stuck now. The problem probably lies in the system, because the usb port is working. Bus 002 Device 006: ID 05ac:1209 Apple, Inc. iPod Video I have added this PPA, I have done all of the sudo update and upgrade. but my computer doesn't realize that my Iphone is connected, whish isn't related to libimobiledevice. The port is working fine, it's my computer it doesn't recognize that I have my Iphone plugged-in! and the phone is working (tested it on my mac). I have the latest versions of these programs: hipo, ipod, gtkpod, ifuse, libusmuxd1 and usbmxd. I try to mount my iphone with fuse but i got this error. ( I connected my iPhone in windows 7 and it worked annoyingly.) alvar@alvars-laptop:~$ ifuse /mnt/iphone/ ERROR: the mount point specified does not exist

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• Do licenses matter if there's nobody around to enforce them?

  - by Corey

  Suppose that the original creators can't (or won't) enforce a license on their software/code, but that work is still popular. I guess if you want to visualize it, I'll throw out a convoluted hypothetical: Imagine a very small group of developers that released a code project under an open-source license. The repository was hosted on their servers. However, the everybody on the immediate development team passed away in a tragic accident or something. Their servers shut down after this happened. The project had a fairly large user base, and so others began to host the last revision on their own servers for others to download. (Yes, I have an active imagination) Does abiding by the license simply become a matter of morality by its users, or can there still exist a legal penalty when there is no one user or group to enforce it? Could anything be done if an unscrupulous user decided to branch off the project and use it under a different license? I am not looking for legal advice -- I am simply curious about how software licenses work. I tend to think of strange situations and wonder what would happen in those scenarios.

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• Apache config file. Redirect permanent gives 403 error

  - by Homunculus Reticulli

  I am changing my domain from foo.com to foobar.org. I used a Redirect permanent in my apache config file, and then restarted apache. When I try to access the old domain foo.com, I get a 403 error. This is what my apache config file looks like: <VirtualHost *:80> ServerName foo.com #ServerAlias www.foo.com #ServerAdmin [email protected] Redirect permanent / http://www.foobar.org/ DocumentRoot /path/to/project/foo/web DirectoryIndex index.php # CustomLog with format nickname LogFormat "%h %l %u %t \"%r\" %>s %b" common CustomLog "|/usr/bin/cronolog /var/log/apache2/%Y%m.foo.access.log" common LogLevel notice ErrorLog "|/usr/bin/cronolog /var/log/apache2/%Y%m.foo.errors.log" <Directory /> Order Deny,Allow Deny from all </Directory> <Files ~ "^\.ht"> Order allow,deny Deny from all </Files> <Directory /path/to/project/foo/web> Options -Indexes -Includes AllowOverride All Allow from All RewriteEngine On # We check if the .html version is here (cacheing) RewriteRule ^$ index.html [QSA] RewriteRule ^([^.])$ $1.html [QSA] RewriteCond %{REQUEST_FILENAME} !-f # No, so we redirect to our front end controller RewriteRule ^(.*)$ index.php [QSA,L] </Directory> <Directory /path/to/project/foo/web/uploads> Options -ExecCGI -FollowSymLinks -Indexes -Includes AllowOverride None php_flag engine off </Directory> Alias /sf /lib/vendor/symfony/symfony-1.3.8/data/web/sf <Directory /lib/vendor/symfony/symfony-1.3.8/data/web/sf> # Alias /sf /lib/vendor/symfony/symfony-1.4.19/data/web/sf # <Directory /lib/vendor/symfony/symfony-1.4.19/data/web/sf> Options -Indexes -Includes AllowOverride All Allow from All </Directory> </VirtualHost> Can anyone spot what I may be doing wrong?. The site foobar.org does exist so I don't know why this error occurs - help?

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• How do I install the Cisco Anyconnect VPN client?

  - by chuck

  I installed Cisco AnyConnect for Ubuntu(64) 12.04, but it failed. It can be installed on Ubuntu 10.10(64). The error log Installing Cisco AnyConnect VPN Client ... Extracting installation files to /tmp/vpn.teuSIr/vpninst096243274.tgz... Unarchiving installation files to /tmp/vpn.teuSIr... Starting the VPN agent... /opt/cisco/vpn/bin/vpnagentd: error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory When I meet that, locate libxml2.so.2 /usr/lib/x86_64-linux-gnu/libxml2.so.2 /usr/lib/x86_64-linux-gnu/libxml2.so.2.7.8 So I create symbol link libxml2.so.2 in /user/lib and after I do: Installing Cisco AnyConnect VPN Client ... Extracting installation files to /tmp/vpn.5cz4FV/vpninst001442979.tgz... Unarchiving installation files to /tmp/vpn.5cz4FV... Starting the VPN agent... /opt/cisco/vpn/bin/vpnagentd: error while loading shared libraries: libxml2.so.2: wrong ELF class: ELFCLASS64 I ensure that there exist lib32 runtime lib on my device. How can I fix this?

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• Efficient solution for multiplayer space partioning?

  - by DevilWithin

  This question is a little tricky, but I will try to make it clear, Lets say I am building an online game, not in a mmo scale, but gladly supporting as many players as possible, in a authoritative server approach, and I want really big worlds with lots of AI simulated enemies. I am aware of a few strategies to save server's CPU by subdividing the space and not processing what doesn't need processing. I 've already split the world by regions, that will require loading times and small transitions, which i think is important to mantain the quality of gameplay when playing locally (alone or even with a couple of friends) because the players won't normally be in more than one or two regions. But even a region can become pretty big, and have a lot of NPC simulating at a time, how do I handle this without screwing the player's experience? Approaches like one server per region and alike are not in the table. I am mainly looking for data structures to hold hordes of enemies, and even peaceful NPC. To finalize the question, please note that vehicles exist, therefore its considerably fast to travel within a region, influencing the "when" to cull areas. Sorry for the confusing question, thanks

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• What is the best way to work with large databases in Java depending on context?

  - by Singletony

  Hi guys. We are trying to figure out the best practice for working with very large DBs in Java. What we do is a kind of BI, i.e analyzing very large DBs, and using them to create intermediate DBs that represent intelligent knowledge of the DBs. We are currently using JDBC, and just preforming queries using a ResultSet. As more and more data is being created, we are wondering whether more appropriate ways exist for parsing and manipulating these large DBs: We need to support 'chunk' manipulation and not an entire DB at once(e.g. limit in JDBC, very poor performance) We do not need to be constantly connected since we are just pulling results and creating new tables of our own. We want to understand JDBC alternatives, with respect to advantages and disadvantages. Whether you think JDBC is the way to go or not, what are the best practices to go by depending on context (e.g. for large DBs queried in chunks) ? If my question is not clear, I will gladly elaborate! THANK YOU SO MUCH!

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• Naming methods that do the same thing but return different types

  - by Konstantin Ð.

  Let's assume that I'm extending a graphical file chooser class (JFileChooser). This class has methods which display the file chooser dialog and return a status signature in the form of an int: APPROVE_OPTION if the user selects a file and hits Open /Save, CANCEL_OPTION if the user hits Cancel, and ERROR_OPTION if something goes wrong. These methods are called showDialog(). I find this cumbersome, so I decide to make another method that returns a File object: in the case of APPROVE_OPTION, it returns the file selected by the user; otherwise, it returns null. This is where I run into a problem: would it be okay for me to keep the showDialog() name, even though methods with that name — and a different return type — already exist? To top it off, my method takes an additional parameter: a File which denotes in which directory the file chooser should start. My question to you: Is it okay to call a method the same name as a superclass method if they return different types? Or would that be confusing to API users? (If so, what other name could I use?) Alternatively, should I keep the name and change the return type so it matches that of the other methods? public int showDialog(Component parent, String approveButtonText) // Superclass method public File showDialog(Component parent, File location) // My method

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• Acer aspire one d270 can not set brightness

  - by Marko

  I hope you can help me figure out how to set the brightness at my netbook. Following problem appears since I installed ubuntu 11.10 on my acer: I am not able to adjust the brightness by FN Keys nor manually at "systemsettings-display". After searching with google for a while, I found a way via the terminal to adjust it with the folloqing command: "sudo setpci -s 00:02.0 f4.b=7f" ( from 00-9f). That was a major breakthrough for me as I am still new to Linux OS. But still seeking a way to get the FN keys for brightness to work, I kept searching until I found "askubuntu.com". I read through various Questions by other acer users and tried there solutions, but unfortunately none worked out for me. From this thread: fn + arrow keys don't adjust actual brightness on an Acer Aspire 5740 "sudo gedit /etc/X11/xorg.conf". This command did not work because the file was not found. I also used nano instead of gedit, but the file was empty( I think it just created the file since it did not exist). These commands which i found gave me a boot loop and I had to repair ubuntu: sudo gedit /etc/default/grub Change the line GRUB_CMDLINE_LINUX="" into GRUB_CMDLINE_LINUX="acpi_osi=Linux" sudo update-grub From this post Screen Brightness not adjustable for Acer Aspire S3: I tried the solution from the last post, but it did not work either. Does anyone know what I could try? I would appreciate it, if someone could help me out with this. Thanks in advance Netbook specs: CPU: Intel Atom N2600 Memory: 2gb DDR3 Storage: 320 GB HD GPU: Intel GMA 3600

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• How to get search engines to properly index an ajax driven search page

  - by Redtopia

  I have an ajax-driven search page that will allow users to search through a large collection of records. Each search result points to index.php?id=xyz (where xyz is the id of the record). The initial view does not have any records listed, and there is no interface that allows you to browse through all records. You can only conduct a search. How do I build the page so that spiders can crawl each record? Or is there another way (outside of this specific search page) that will allow me to point spiders to a list of all records. FYI, the collection is rather large, so dumping links to every record in a single request is not a workable solution. Outputting the records must be done in multiple requests. Each record can be viewed via a single page (eg "record.php?id=xyz"). I would like all the records indexed without anything indexed from the sitemap that shows where the records exist, for example: <a href="/result.php?id=record1">Record 1</a> <a href="/result.php?id=record2">Record 2</a> <a href="/result.php?id=record3">Record 3</a> <a href="/seo.php?page=2">next</a> Assuming this is the correct approach, I have these questions: How would the search engines find the crawl page? Is it possible to prevent the search engines from indexing the words "Record 1", etc. and "next"? Can I output only the links? Or maybe something like:  

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• Back up a single table in SQL Server

  - by BuckWoody

  SQL Server doesn’t have an easy way to take a table backup, so I often use the bcp (Bulk Copy Program) to accomplish the same goal. I’ve mentioned this before, and someone told me when they tried it they couldn’t restore the table – ah the dangers of telling people half the information! I should have mentioned that you need to have a “format file” ready if the table does not exist at the destination. In my case I already had the table, in this person’s case they did not. The format file can be used to rebuild that table structure before the data is bcp’d in, and you can read more about it here: http://msdn.microsoft.com/en-us/library/ms191516.aspx There’s another way to back up a table, and that’s to create a Filegroup and place the table there. Then you can take a Filegroup backup to back up a single table. Of course, there are other methods of moving a single table’s data in an out, including SQL Server Integration Services and even the older Data Transformation Services, or simply by using hte SQLCMD or PowerShell utilities to run a query and just save the output to a file. In fact, these days I’m using a PowerShell script to build INSERT statements from that query. That could also easily be modified to create the table structure (or modify one if needed) quite easily. Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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• How do i make my existing ubuntu in a bootable installation CD? I tried remastersys but fails with 11.10

  - by YumYumYum

  I need to install 10 PC which has identical setup and hardware. So i was trying remastersys but its failing. How can i resolve this or use something else to achieve this? Updating the remastersys.log cat: /home/remastersys/remastersys/tmpusers: No such file or directory Cleaning up the install icon from the user desktops Removing the ubiquity frontend as it has been included and is not needed on the normal system Calculating the installed filesystem size for the installer Removing remastersys-firstboot from system startup Removing any system startup links for /etc/init.d/remastersys-firstboot ... /etc/rc0.d/K20remastersys-firstboot /etc/rc1.d/K20remastersys-firstboot /etc/rc2.d/S20remastersys-firstboot /etc/rc3.d/S20remastersys-firstboot /etc/rc4.d/S20remastersys-firstboot /etc/rc5.d/S20remastersys-firstboot /etc/rc6.d/K20remastersys-firstboot Making disk compatible with Ubuntu Startup Disk Creator. Creating md5sum.txt for the livecd/dvd Creating /var/tmp/custom.iso in /home/remastersys/remastersys The iso was not created. There was a problem. Exiting Follow up: 1) I am unhappy that there is nothing exist for this to recover/backup 11.10 2) Anyway i have to do it 3) I did not used the popular Clonezilla because it does not offer me iso 4) I downloaded: http://clonezilla-sysresccd.hellug.gr/download.html a) created a bootable CD from that ISO b) booted and followed those steps http://clonezilla-sysresccd.hellug.gr/restore.html c) i got a iso file with everyhing on it including boot-loaders 5) then in another system i used my same CD to restore my image Perfectly worked.

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• MySql #2002 problem

  - by Systeem Faillure

  when i try to login in apache i get #2002 error. when i try to login via terminal it ask my password mysql -u root and i get ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) i tried to remove mysql and install it again and nothing happen ( i cant even remove it) i try to reboot apache but still nothing. i tried to reboot my pc and of course still aint working. in terminal i put sudo start mysql i got this: start: Job failed to start mysql -ubob -hlocalhost -P3306 -p got me this ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) sudo service mysql stop gave me this stop: Unknown instance: my.cnf * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp lc-messages-dir = /usr/share/mysql skip-external-locking # i tried to find if there is a file in my /var/run/mysqld/ or in /var/tmp/ and dint find the file mysqld.sock .. i looked in /var/log/mysql/ and dont even have anything in it can help me???i try to find help on google for hours and dint help at all... -------EDIT---------- salem : sudo service mysql start i get start: Job failed to start cat /var/log/syslog | grep mysql here http://paste.ubuntu.com/1335984/ /var/run/mysqld/ this folder exist but it dosent have anything in it /var/run/mysqld/ i get total 0 drwxr-xr-x 2 mysql root 40 Nov 5 22:31 . drwxr-xr-x 25 root root 860 Nov 5 22:32 .. sorry that i post anything my terminal gives but i am noob at this. hope this information will do.

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• Corrupted Views when migrating document libraries from SharePoint 2003 to 2007

  - by Kelly Jones

  A coworker of mine ran into this error recently, while migrating a document library from SharePoint 2003 to 2007: “A WebPartZone can only exist on a page which contains a SPWebPartManager. The SPWebPartManager must be placed before any WebPartZones on the page.” He saw this when he tried to see the All Documents view for the library. After looking into it, we figured out what had happened.  He was migrating documents using the Explorer View in SharePoint.  He had copied the contents of the library from one server (a remote server that we didn’t have administrative access to) to his desktop.  He then opened an Explorer View of the new library and copied the files to it.  Well, it turns out he had copied the hidden “Forms” folder, which contained the files necessary to display the different views for the library. (He had set his explorer to show hidden files, which made them visible.) So, he had copied the 2003 forms to the 2007 library, which are incompatible. We fixed it, by simply deleting the new document library, recreating it, and then copied everything except that hidden Forms folder.  Another option might have been to create a new document library on 2007, and copy the Forms folder from it to the broken library.  Since we didn’t need to save anything in the broken BTW, I confirmed my suspicion with this blog post: http://palmettotq.com/blog/?p=54

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• How do I prevent skype from starting another instance when it's already running?

  - by con-f-use

  Just a little unnecessary annoyance to fix here: Suppose you have Skype for Ubuntu running. You accidentally click on the launcher again. The way it is now, Skype starts a second instance, which promptly tells you it can't log in. There is another instance already running. To make things worse: On the next regular start of Skype it you will have to re-enter your saved password, due to the "Sign in failure". I thought this would be fixed soon but neither Canonical nor Microsoft care enough. The annoyance continues to exist for the last three updates at least. So in an approach to provide a workaround I will post what I've done to prevent this behaviour. Maybe it's useful for some of you. Maybe it will rise awareness and cause a fix. I'm happy for any better solution btw. and that's the real purpose of my question. Usually I don't answer them myself. So doesn anyone know of a better solution to fix dual instancing of Skype?

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• Host is unreacheble with static networking configuration via /etc/network/interfaces while GUI NetworkManager is ok

  - by Riccardo

  I have some trouble setting-up the network interface using the static IP configuration. I run ubuntu 12.04 kernel 3.11.0-22 with the back-ports enabled. I followed these instructions from help.ubuntu.com but there seems to exist some conflict between the GUI approach (NetworkManager) and the command line approach. $ sudo nano /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 10.1.1.50 gateway 10.1.1.10 netmask 255.255.255.0 dns-nameservers 192.168.3.45 192.168.8.10 $ sudo /etc/init.d/networking restart I than try to ping for example google.com ping -c 3 www.google.com the response is that the host is unreachable. The icon on the top right of the desktop says: wired network disconnected. If I work using the GUI approach (Edit Connections and so on...) all works great. Can same one explain to me where I wrong? $ ifconfig eth0 eth0 Link encap:Ethernet HWaddr 90:e6:ba:07:4a:77 inet addr:10.1.1.50 Bcast:10.1.1.255 Mask:255.255.255.0 inet6 addr: fe80::92e6:baff:fe07:4a77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:39619 errors:0 dropped:0 overruns:0 frame:0 TX packets:18520 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:19030895 (19.0 MB) TX bytes:2768769 (2.7 MB) $ netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0

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• How to restrict paddle movement using Farseer Physics engine 3.2

  - by brainydexter

  I am new to using Farseer Physics Engine 3.2(FPE), so please bear with my questions. Also, since FPE 3.2 is based on Box2D, I have been reading Box2D manual and pieces of code scattered in samples to better understand terminology and usage. Pong is usually my testbed whenever I try to do something new. Here is one of the issue I am running into: How can I restrict paddles to move only along Y axis, because the ball comes in and knocks off the paddles and everything floats in space afterwards ? (Box = Rectangle and ball = circle) I know MKS is the unit system, but is there a recommendation for sizes/position to be used ? I know this is a very generic question, but it would be good to know a simple set of values that one could use for making a game as simple as pong. Between box2d and FPE, I have some doubts: what is the recommended way of making a body in FPE ? world.CreateBody() does not exist in FPE Box2d manual recommends never to "new" body(since Box2D uses Small Object allocators), so is there a recommended way in Farseer to create a body (apart from factories) ? In box2d, it is recommended to keep a track of the body object, since it is also the parent to fixture(s). Why is it that in most of the examples, the fixture object is tracked ? Is there a reason why body is not tracked ? Thanks

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• Error using SoapClient() in PHP [migrated]

  - by Dhaval

  I'm trying to access WSDL(Web Service Definition Language) file using SoapClient() of PHP. I found that WSDL file is authenticated. I tried with passing credentials on an array by another parameter and active SSL on my server, still I'm getting an error. Here is the code I'm using: $client = new SoapClient("https://webservices.chargepointportal.net:8081/coulomb_api_1.1.wsdl",array("trace" = "1","Username" = "username","Password" = "password")); Here is the error I'm getting: Warning: SoapClient::SoapClient(https://webservices.chargepointportal.net:8081/coulomb_api_1.1.wsdl) [soapclient.soapclient]: failed to open stream: Connection timed out in PATH_TO_FILE on line 80 Warning: SoapClient::SoapClient() [soapclient.soapclient]: I/O warning : failed to load external entity "https://webservices.chargepointportal.net:8081/coulomb_api_1.1.wsdl" in PATH_TO_FILE on line 80 Fatal error: Uncaught SoapFault exception: [WSDL] SOAP-ERROR: Parsing WSDL: Couldn't load from 'https://webservices.chargepointportal.net:8081/coulomb_api_1.1.wsdl' : failed to load external entity "https://webservices.chargepointportal.net:8081/coulomb_api_1.1.wsdl" in PATH_TO_FILE:80 Stack trace: #0 /home2/wingstec/public_html/widget/API/index.php(80): SoapClient-SoapClient('https://webserv...', Array) #1 {main} thrown in PATH_TO_FILE on line 80 It seems that error says file not exist at the path we given but when we run that path directly on browser then we're getting that file Can anyone help me to figure out what the exactly problem is?

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• Who would be the most efficacious Patron Saint of Programmers? [closed]

  - by Peter Turner

  The purpose of this question is to find someone out there to intercede for us and help our coding (not to magically align the bytes), to inspire our daily grind of software development by their lives of heroic virtue, to unite us under a common patron and to keep us on the straight and narrow path (i.e. don't be evil). In days of yore, the professional guilds had a patron saint. Regardless of whether we have a higher tendency to be atheists or not, who would you choose as the patron saint of programmers and what would be your criteria? Some people have chosen St. Isidore of Seville, but he's more like the patron saint of Wikipedia. If you're not Catholic please don't hesitate to nominate someone, just say what your criteria is. At the very least they should be dead and have lived a life of heroic virtue - or have died trying. It's a very pragmatic and noble custom which I heartily encourage. But if you find the practice off-putting, please don't be offended. I only mean to ask this question to other like minded programmers, which I have reason to believe exist. If you add a picture and a maybe make up a prayer that'd be excellent. It doesn't have to be gilded, illuminated and rhyme, although that would be sweet.

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• Recommended: IntelliCommand for Visual Studio 2010/2012

  - by WeigeltRo

  The Morning Brew is a great news source for developers for many years now. In its most recent post it mentioned an extension for Visual Studio 2010 and 2012 called IntelliCommand that implements something that I had wanted for quite some time: Some kind of dynamic help for hotkeys. IntelliCommand shows a popup when you press and hold Ctrl, Shift or Alt (or combinations thereof) for a configurable amount of time, or after you press the first key combination of a chord shortcut key (e.g. Ctrl-E) and wait for an (independently configurable) amount of time. In the following screenshot I pressed and released Ctrl-E, and after a short delay the popup appeared: The extension is available in the Visual Studio Gallery, so finding, downloading and installing it via the Extension Manager is extremely simple: The default delays (2000 / 1600 milliseconds) are a bit long for my liking, but this can be changed in Tools – Options: So far things are working great on my machine. Some known issues do seem to exist, though (e.g. that the extension doesn’t work on non-EN versions of Visual Studio). See the author’s comments in the announcement blog post and in the Visual Studio Gallery for more information.

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• Splitting up a Rails/Ruby app onto multiple servers

  - by craig.kaminsky

  We recently moved a large application to two machines, both running the same codebase. I. Machine A Web server for public facing application Receives web hook call backs from our ESP Handles a few large, list-processing jobs (uploaded spreadsheets with data) II. Machine B Manages a massive set of (background) jobs but, primarily, focuses on building and assembling newsletters Runs all integration with our NetSuite platform Runs all system maintenance (read: DB) jobs To me, having these two apps running the same codebase (a large, monolithic Rails application) seems 'wrong'. I am wondering if anyone has advice on how to better break up the code for these two apps. While they both need the same DB and, ultimately, the same model code, Machine B has no need for Controllers and Views and it feels wasteful running a full-stack Rails app for its tasks. A couple things came to mind but I'm not sure if I'm trying to solve a problem that doesn't exist: Break the models out into a sub-module on git and include into both apps Build out the Mahcine B app in plain Ruby or a lighter framework like Sinatra (where I could use ActiveRecord with Sinatra in combo with a sub-module for the model folder). I'm new to this scenario and appreciate any and all feedback or direction! Thank you.

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• EPM 11.1.2.2 Architecture: Essbase

  - by Marc Schumacher

  Since a lot of components exist to access or administer Essbase, there are also a couple of client tools available. End users typically use the Excel Add-In or SmartView nowadays. While the Excel Add-In talks to the Essbase server directly using various ports, SmartView connects to Essbase through Provider Services using HTTP protocol. The ability to communicate using a single port is one of the major advantages from SmartView over Excel Add-In. If you consider using Excel Add-In going forward, please make sure you are aware of the Statement of Direction for this component. The Administration Services Console, Integration Services Console and Essbase Studio are clients, which are mainly used by Essbase administrators or application designers. While Integration Services and Essbase Studio are used to setup Essbase applications by loading metadata or simply for data loads, Administration Services are utilized for all kind of Essbase administration. All clients are using only one or two ports to talk to their server counterparts, which makes them work through firewalls easily. Although clients for Provider Services (SmartView) and Administration Services (Administration Services Console) are only using a single port to communicate to their backend services, the backend services itself need the Essbase configured port range to talk to the Essbase server. Any communication to repository databases is done using JDBC connections. Essbase Studio and Integration Services are using different technologies to talk to the Essbase server, Integration Services uses CAPI, Essbase Studio uses JAPI. However, both are using the configured port range on the Essbase server to talk to Essbase. Connections to data sources are either based on ODBC (Integration Service, Essbase) or JDBC (Essbase Studio). As for all other components discussed previously, when setting up firewall rules, be aware of the fact that all services may need to talk to the external authentication sources, this is not only needed for Shared Services.

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• Do we really need a thousand Linux distributions?

  - by nebukadnezzar

  Pointed from an answer to a (possibly related) question, I came across this graphic, and I'm shocked how many linux distributions currently exist. However, it seems that most of these distributions are forks of already popular distributions with minimal changes, usually limited to themes, wallpapers, buttons, the kind of stuff most people probably wouldn't see as a reason to fork a Linux distribution. Of course, someone will always say "Opensource is also about the freedom of choice", and while I wholeheartedly agree, I do not believe that this is a valid reason to fork an already perfectly working Distribution into a new one, which might possibly result in less security/stability due to smaller group of developers. There's another problem: Those, who want to switch to Linux, are confronted with a neverending list of Linux distributions, and wonder rightfully which they're supposed to chose (infact, I was facing that problem before I've discovered Ubuntu). There might be (very few) valid reasons to fork a distribution: Specializing on a particular topic (FOSS Only, work-related topic (i.e., for a Hospital), etc) An exceptional architecture, that requires a special set of software Use of non-FOSS, propietary technology, and such But even with these points in mind, it would still seem easier to create a subdistribution with the required changes, such as XUbuntu with XFCE4, KUbuntu with KDE4, Fluxbuntu with Fluxbox, etc. So, why exactly do we need so many distributions?

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