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• pymatplotlib without xserver

  - by vigilant

  Is it possible to use networkx or pymatplotlib without an xserver running? I keep getting the following error with their first example (of networkx): Traceback (most recent call last): File "test.py", line 17, in <module> nx.draw(G,pos,node_color='#A0CBE2',edge_color=colors,width=4,edge_cmap=plt.cm.Blues,with_labels=False) File "/usr/local/lib/python2.6/dist-packages/networkx-1.3-py2.6.egg/networkx/drawing/nx_pylab.py", line 124, in draw cf=pylab.gcf() File "/usr/lib/pymodules/python2.6/matplotlib/pyplot.py", line 276, in gcf return figure() File "/usr/lib/pymodules/python2.6/matplotlib/pyplot.py", line 254, in figure **kwargs) File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_tkagg.py", line 90, in new_figure_manager window = Tk.Tk() File "/usr/lib/python2.6/lib-tk/Tkinter.py", line 1646, in __init__ self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use) _tkinter.TclError: couldn't connect to display ""

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• Is LSB's init script function "start_daemon" really used for real daemons or should I stick to start-stop-daemon?

  - by Fred

  In the context of init scripts, according to the LSB specification, "Each conforming init script shall execute the commands in the file /lib/lsb/init-function", which then defines a couple of functions to be used when using daemons. One of those functions is start_daemon, which obviously "runs the specified program as a daemon" while checking if the daemon is already running. I'm in the process of daemonizing a service app of mine, and I'm looking at how other daemons are run to try to "fit in". In the process of looking how it's done elsewhere, I noticed that not a single daemon on my Ubuntu 10.04 machine uses start_daemon. They all call start-stop-daemon directly. Same goes for my Fedora 14 machine. Should I try to play nice and be the first one to use start_daemon, or is there really no point and start-stop-daemon is the way to go since everybody is already using that? Why is there no daemons using LSB's functions?

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• Laptop Locking Up

  - by David

  I am having a very weird issue on a Lenovo W510 laptop. It will lock up randomly. I have had it lock up during post, during the boot-up of Linux, during login, and after the login. The following are tests that I have performed on the laptop. I ran memtest I took out the extra memory module. I swapped the HDD with another HDD that had Windows 7 on it. (It BSOD'd, and before anyone could possibly read the error line, it restarts.) I tried taking the battery out and booting with only the Power cord. The only other options I can think of the problem being are the motherboard or the PSU. If anyone has any advice, I appreciate it. If not, the HP guy will be here in a few days to fix it. I would just love to call them up and tell them that the service is no longer needed.

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• LDAP encrypt attribute that extends userpassword

  - by Foezjie

  In my current LDAP schema I have an objectclass (let's call it group) that has 2 attributes that extend userpassword. Like this: attributeType ( groupAttributes:12 NAME 'groupPassword1' SUP userPassword SINGLE-VALUE ) attributeType ( groupAttributes:13 NAME 'groupPassword2' SUP userPassword SINGLE-VALUE ) group extends organisation so already has a userpassword attribute. If I use that to enter a new group using PHPLDAPAdmin it uses SSHA (by default) and encrypts/hashes the password I entered. But the passwords I entered for groupPassword1 en groupPassword2 don't get encrypted. Is there a way to make it so that those attributes are encrypted too?

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• OpenGL Application displays only 1 frame

  - by Avi

  EDIT: I have verified that the problem is not the VBO class or the vertex array class, but rather something else. I have a problem where my vertex buffer class works the first time its called, but displays nothing any other time its called. I don't know why this is, and it's also the same in my vertex array class. I'm calling the functions in this order to set up the buffers: enable client states bind buffers set buffer / array data unbind buffers disable client states Then in the draw function, that's called every frame: enable client states bind buffers set pointers unbind buffers bind index buffer draw elements unbind index buffer disable client states Is there something wrong with the order in which I'm calling the functions, or is it a more specific code error? EDIT: here's some of the code Code for setting pointers: //element is the vertex attribute being drawn (e.g. normals, colors, etc.) static void makeElementPointer(VertexBufferElements::VBOElement element, Shader *shade, void *elementLocation) { //elementLocation is BUFFER_OFFSET(n) if a buffer is bound switch (element) { .... glVertexPointer(3, GL_FLOAT, 0, elementLocation); //changes based on element .... //but I'm only dealing with } //vertices for now } And that's basically all the code that isn't just a straight OpenGL function call.

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• IIS not listening over external network, all other traffic working

  - by Beuy

  Hello there, I have a very odd situation, I have a server (let's call it X) running 2008 R2 with two NIC's in it, one is connected to the work domain and has a subnet of 192.168.10.0/24 the other is connected to a ADSL connection and has a subnet of 192.168.1.0/24. The server has IIS installed. On the ADSL connection I have setup a dynamic dns and port forwarding to allow external HTTP, HTTPS, FTP and RDP connections. FTP and RDP are working fine however neither HTTP or HTTPS are working at all. I can browse the websites by going to localhost on the machine, the HTTP and HTTPS ports appear as "Filtered" when I try to scan them using PortQueryUI and browsers respond with a "Server took too long to load or was not responding" error. This was working fine just a few days ago, Windows firewall is disabled I don't have any software firewall on it. And I'm really lost. Any help would be great.

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• Sporadic unspecific kernel panic

  - by koma

  I'm experiencing seldom (so far about once a month) hard crashes on our ubuntu server 10.04 LTS box. The box itself is quite old (Dell PowerEdge 750 from 2004, Pentium4 2.8 GHz). I set up netconsole after it crashed twice last thursday and was able to extract the following output: [ 9354.062473] invalid opcode: 0000 [#1] SMP [ 9354.062516] last sysfs file: /sys/devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/uevent [ 9354.062555] Modules linked in: ppdev adm1026 hwmon_vid i2c_i801 bridge stp dcdbas psmouse serio_raw netconsole configfs shpchp lp parport usbhid hid e1000 [ 9354.062685] [ 9354.062704] Pid: 3988, comm: rsync Not tainted 2.6.38-12-generic-pae #51~lucid1-Ubuntu Dell Computer Corporation PowerEdge 750 /0R1479 [ 9354.062773] EIP: 0060:[<c104fef1>] EFLAGS: 00010046 CPU: 1 [ 9354.062802] EIP is at check_preempt_wakeup+0x181/0x250 [ 9354.062826] EAX: 00000002 EBX: f2a10ccc ECX: 00000000 EDX: 00000002 [ 9354.062850] ESI: f1db71cc EDI: f1db71a0 EBP: f1dbdea8 ESP: f1dbde8c [ 9354.062875] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 9354.062900] Process rsync (pid: 3988, ti=f1dbc000 task=f1db71a0 task.ti=f1dbc000) [ 9354.062933] Stack: [ 9354.062951] 0053ea60 f7907680 f28da840 f2a10ca0 c153ea60 f7907680 c153ea60 f1dbdebc [ 9354.063019] c103f98a f2a10ca0 f7907680 00000001 f1dbdef8 c104f97f 00000000 f2f0bacc [ 9354.063088] f7904338 00000001 00000003 00000000 f2f0bacc 00000001 00000001 00000086 [ 9354.063157] Call Trace: [ 9354.063183] [<c103f98a>] check_preempt_curr+0x6a/0x80 [ 9354.063210] [<c104f97f>] try_to_wake_up+0x5f/0x3f0 [ 9354.063236] [<c1077a00>] ? hrtimer_wakeup+0x0/0x30 [ 9354.063261] [<c104fd64>] wake_up_process+0x14/0x20 [ 9354.063286] [<c1077a1d>] hrtimer_wakeup+0x1d/0x30 [ 9354.063310] [<c1077f4a>] __run_hrtimer+0x7a/0x1c0 [ 9354.063336] [<c107dbad>] ? ktime_get+0x6d/0x110 [ 9354.063360] [<c1078310>] hrtimer_interrupt+0x120/0x2b0 [ 9354.063390] [<c1535c36>] smp_apic_timer_interrupt+0x56/0x8a [ 9354.063418] [<c152f459>] apic_timer_interrupt+0x31/0x38 [ 9354.063446] [<c1520000>] ? mca_attach_bus+0x5/0xc0 [ 9354.063469] Code: 8b 9b 20 01 00 00 8b 86 24 01 00 00 3b 83 24 01 00 00 75 e6 85 db 0f 84 a3 00 00 00 89 da 89 f0 e8 75 f6 fe ff 83 f8 01 0f 85 00 <fe> ff ff 89 f8 e8 95 f9 fe ff 8b 5e 1c 85 db 0f 84 e4 fe ff ff [ 9354.063804] EIP: [<c104fef1>] check_preempt_wakeup+0x181/0x250 SS:ESP 0068:f1dbde8c [ 9354.064231] ---[ end trace 290689cea65aea7f ]--- [ 9354.064290] Kernel panic - not syncing: Fatal exception in interrupt [ 9354.064352] Pid: 3988, comm: rsync Tainted: G D 2.6.38-12-generic-pae #51~lucid1-Ubuntu [ 9354.064424] Call Trace: [ 9354.064481] [<c152c057>] ? panic+0x5c/0x15b [ 9354.064539] [<c15302bd>] ? oops_end+0xcd/0xd0 [ 9354.064539] [<c100d9e4>] ? die+0x54/0x80 [ 9354.064539] [<c152f926>] ? do_trap+0x96/0xc0 [ 9354.064539] [<c100ba00>] ? do_invalid_op+0x0/0xa0 [ 9354.064539] [<c100ba8b>] ? do_invalid_op+0x8b/0xa0 [ 9354.064539] [<c104fef1>] ? check_preempt_wakeup+0x181/0x250 [ 9354.064539] [<c144884d>] ? __kfree_skb+0x3d/0x90 [ 9354.064539] [<c1042ae7>] ? update_curr+0x247/0x2a0 [ 9354.064539] [<c10447bb>] ? update_cfs_load+0x11b/0x2d0 [ 9354.064539] [<c1042a25>] ? update_curr+0x185/0x2a0 [ 9354.064539] [<c152f6bf>] ? error_code+0x67/0x6c [ 9354.064539] [<c104fef1>] ? check_preempt_wakeup+0x181/0x250 [ 9354.064539] [<c103f98a>] ? check_preempt_curr+0x6a/0x80 [ 9354.064539] [<c104f97f>] ? try_to_wake_up+0x5f/0x3f0 [ 9354.064539] [<c1077a00>] ? hrtimer_wakeup+0x0/0x30 [ 9354.064539] [<c104fd64>] ? wake_up_process+0x14/0x20 [ 9354.064539] [<c1077a1d>] ? hrtimer_wakeup+0x1d/0x30 [ 9354.064539] [<c1077f4a>] ? __run_hrtimer+0x7a/0x1c0 [ 9354.064539] [<c107dbad>] ? ktime_get+0x6d/0x110 [ 9354.064539] [<c1078310>] ? hrtimer_interrupt+0x120/0x2b0 [ 9354.064539] [<c1535c36>] ? smp_apic_timer_interrupt+0x56/0x8a [ 9354.064539] [<c152f459>] ? apic_timer_interrupt+0x31/0x38 [ 9354.064539] [<c1520000>] ? mca_attach_bus+0x5/0xc0 Googling for this issue didn't really turn up anything useful (most stuff I found was related to btrfs, but I don't use that, although the module exists and is sometimes loaded). From experience it might have to do with relatively heavy I/O, as two of the panics happened during a backup procedure. Kernel is 2.6.38-12-generic-pae, but I'm pretty sure I also saw panics on 2.6.32. I meanwhile upgraded to 3.0.0-17-generic-pae and am waiting for the next crash ;-) I'm at a loss here, so any pointers where to look for the cause or what it could be would be great :-) Thanks !

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• Combine several locations with regex in nginx

  - by AlexAtNet

  I dynamic number of Joomla installations in subfolders of the domain. For example: http://site/joomla_1/ http://site/joomla_2/ http://site/joomla_3/ ... Currently I have the follwing config that works: index index.php; location / { index index.php index.html index.htm; } location /joomla_1/ { try_files $uri $uri/ /joomla_1/index.php?q=$uri&$args; } location /joomla_2/ { try_files $uri $uri/ /joomla_2/index.php?q=$uri&$args; } location ~ \.php$ { fastcgi_pass unix:/var/run/php5-fpm/joomla.sock; ... } I'm trying to combine joomla_N rules in one: location ~ ^/(joomla_[^/]+)/ { try_files $uri $uri/ /$1/index.php?q=$uri&$args; } but server starts to return index.php as is (does not call the php-fpm). It looks like the nginx stops the processing of the regex rules after the first match. Is there any way to combine this rules with something like regex?

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• What are the risks in putting website files in the "root" folder of a shared web hosting server?

  - by Obay Ouano

  A site I've been asked to manage is hosted (shared) on GoDaddy, with this folder structure: / public_html public_ftp mail stats logs etc... However, the website files are stored in the / folder, and NOT in public_html. I'm not sure if this is how GoDaddy sets up their customers' accounts, or if the old web developer accidentally changed it from public_html to root. But when we call up GoDaddy to tell them to correct this (move files to public_html), they won't change it and insist that there is no security risk unless someone gets a hold of the FTP password. Is this true? (I have always read that website files should be inside public_html.) If not, where could this setting be changed? The .htaccess is empty.

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• Can i change the order of these OpenGL / Win32 calls?

  - by Adam Naylor

  I've been adapting the NeHe ogl/win32 code to be more object orientated and I don't like the way some of the calls are structured. The example has the following pseudo structure: Register window class Change display settings with a DEVMODE Adjust window rect Create window Get DC Find closest matching pixel format Set the pixel format to closest match Create rendering context Make that context current Show the window Set it to foreground Set it to having focus Resize the GL scene Init GL The points in bold are what I want to move into a rendering class (the rest are what I see being pure win32 calls) but I'm not sure if I can call them after the win32 calls. Essentially what I'm aiming for is to encapsulate the Win32 calls into a Platform::Initiate() type method and the rest into a sort of Renderer::Initiate() method. So my question essentially boils down to: "Would OpenGL allow these methods to be called in this order?" Register window class Adjust window rect Create window Get DC Show the window Set it to foreground Set it to having focus Change display settings with a DEVMODE Find closest matching pixel format Set the pixel format to closest match Create rendering context Make that context current Resize the GL scene Init GL (obviously passing through the appropriate window handles and device contexts.) Thanks in advance.

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• GTK app: How do I create a working indicator with Qt/C++?

  - by hakermania

  I've tried in 2 forums, but I had no luck so far. So, I am using Qt IDE in order to build my application so as to participate to the Ubuntu Showdown contest. In my application, I've done the following: void show_app(MainWindow *data) { //this works fine: app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_PASSIVE); //this crashes the application: data->show(); } void MainWindow::make_indicator() { if(appindicator){ //appindicator has already been created return; } appindicator = app_indicator_new("Format Junkie Indicator", "formatjunkie", APP_INDICATOR_CATEGORY_APPLICATION_STATUS); GtkWidget* showapp_option; GtkWidget* indicatormenu = gtk_menu_new(); GtkWidget* item = gtk_menu_item_new_with_label("Format Junkie main menu"); gtk_menu_item_set_submenu(GTK_MENU_ITEM(item), indicatormenu); showapp_option = gtk_menu_item_new_with_label("Show App!"); g_signal_connect(showapp_option, "activate", G_CALLBACK(show_app), this); gtk_menu_shell_append(GTK_MENU_SHELL(indicatormenu), showapp_option); gtk_widget_show_all(indicatormenu); app_indicator_set_status(appindicator, APP_INDICATOR_STATUS_ACTIVE); app_indicator_set_attention_icon(appindicator, "dialog-warning"); app_indicator_set_menu(appindicator, GTK_MENU (indicatormenu)); } So, basically I am trying to make a simple indicator entry, which, on click, it will hide the indicator and display the application. The indicator can be successfully hidden using the PASSIVE thingy over there, but, during the call data-show();, the application crashes. Any help on what I am doing wrong would be appreciated! Also, please help me to correct this problem I'm facing (alternatively, I will migrate to the old and good tray icon (it works fine in 12.04, anyway) which I can handle very easily and efficiently)

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• Slackware 12 - installed cairo but cannot be seen

  - by piro

  Hi. I wanted to install gtk+ 2.16.5, so i also installed glib, pango and cairo. All seemed to work well, except for cairo. At first I got an error while configuring: Requested 'cairo = 1.6' but version of cairo is 1.4.12 I installed the newest version of cairo without any problems, i rebooted the comp and when i started the configure again the same thing happened and it showed me the same error. I also can see this: Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables BASE_DEPENDENCIES_CFLAGS and BASE_DEPENDENCIES_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. Can someone help me ? Thanks.

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• What is appropriate way for managing MySQL connection through C#

  - by Sylca

  My question, at the bottom line, is what is the appropriate(best) way to manage our connection towards MySQL db with C#. Well, currently I'm working on some C# (winforms type) <- MySQL application and I've been looking at Server Connections in MySQL Administrator, been witness of execution of my mysql_queries, connection opens an closes, ... an so on! In my C# code I'm working like this and this is an example: public void InsertInto(string qs_insert) { try { conn = new MySqlConnection(cs); conn.Open(); cmd = new MySqlCommand(); cmd.Connection = conn; cmd.CommandText = qs_insert; cmd.ExecuteNonQuery(); } catch (MySqlException ex) { MessageBox.Show(ex.ToString()); } finally { if (conn != null) { conn.Close(); } } } Meaning, every time I want to insert something in db table I call this table and pass insert query string to this method. Connection is established, opened, query executed, connection closed. So, we could conclude that this is the way I manage MySQL connection. For me and my point of view, currently, this works and its enough for my requirements. Well, you have Java & Hibernate, C# & Entity Framework and I'm doing this :-/ and it's confusing me. Should I use MySQL with Entity Framework? What is the best way for collaboration between C# and MySQL? I don't want to worry about is connection that I've opened closed, can that same connection be faster, ...

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• Is there an easily configurable way to inject data into IIS 6 SMTP logs?

  - by Lorcan O'Neill

  I am using IIS 6 SMTP server to send out some mail on our behalf. I am also storing each message we send in a SQL table - with a UUID representing each message. I would like to be able to inject additional data into the SMTP logs located in SMTPSVC1 - an additional field which would contain this UUID in the event of a RCPT cs-method call. This is so that I can check a one-to-one relationship between messages sent in SQL and messages actually sent through SMTP. If possible, I would like to avoid writing a C++ custom logger as some sites I've viewed have suggested. Is there an easily configurable way to inject this data into IIS 6 logs? Even if it was only the ability to perform a regex on the data/headers of the outgoing email, that would be enough. Thanks!

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• How do I split an internet connection into 4 equal connections?

  - by luis velasco

  My 4 roomates and I have a problem: One of my roomies is downloading torrents all the time. When somebody need make a call or doing something like you tube or a quiz using the internet conection. The internet is very slow.... I can not create a network using a computer as a proxy. I just need a good router (and in the budget no more than $50).. I just want to split a 16MB connection into a separated 4 x 4 mb (theoretically)..

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• Having the same texture data in different ID3D11Texture2D

  - by bdmnd

  Sorry if this has been answered elsewhere - I'm rather new to DX. My question concerns conservation of resources - specifically textures in VRAM. I assume that upon returning from a call to CreateTexture2D, a copy of any textures data supplied has been copied elsewhere, likely VRAM. Does DX11 have any facility for having multiple ID3D11Texture2D objects which point to the same data? This might at first seem silly, but imagine a ID3D11Texture2D which is an array of textures. In one material, an artist has chosen to blend three identically sized maps, saved on disk as A.dds, B.dds, and C.dds. Then imagine they have another material which also uses three maps, but this time A.dds, B.dds, and D.dds. The shader code knows the diffuse texture is a texture array, and also has the number of layers baked (three in each case). I would essentially like to set up just two ID3D11Texture2D objects, one for each material, but I don't want to waste VRAM for two identical copies of A.dds and B.dds. I could use explicit texture arrays, of course, but this reduces the number of resources available to the shader and can complicate code somewhat more than would otherwise be needed.

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• Serve my website from different server during downtime

  - by nfedyashev.mp

  I have a VPS server running in the cloud. Fully automated server image upgrade/downgrade(by RAM/HDD plans). The problem is that server upgrade/downgrade takes time and involves total unavailability during this period(up to 30 minutes). Goal: during this downtime server my website(http://mydomain.here) from different server with some message like "Under construction". How can I do this? -- mydomain.here is hosted on godaddy and uses its DNS(If I call it right). It's pointing with A-record to my VPS's IP address now. Change in these DNS settings will take more than 30minutes, so it's not an option. How can I find mode "dynamic" DNS? What should I learn?

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• Is sending data to a server via a script tag an outdated paradigm?

  - by KingOfHypocrites

  I inherited some old javascript code for a website tracker that submits data to the server using a script url: var src = "http://domain.zzz/log/method?value1=x&value2=x" var e = document.createElement('script'); e.src = src; I guess the idea was that cross domain requests didn't haven't to be enabled perhaps. Also it was written back in 2005. I'm not sure how well XmlHttpRequests were supported at the time. Anyone could stick this on their website and send data to our server for logging and it ideally would work in most any browser with javascript. The main limitation is all the server can do is send back javascript code and each request has to wait for a response from the server (in the form of a generic acknowledgement javascript method call) to know it was received, then it sends the next. I can't find anyone doing this online or any metrics as to whether this faster or more secure than XmlHttpRequests. I don't know if this is just an old way of doing things or it's still the best way to send data to the server when you are mostly trying to send data one way and you need the best performance possible. So in summary is sending data via a script tag an outdated paradigm? Should I abandon in favor of using XmlHttpRequsts?

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• Is there a log showing why a Windows server did not restart SQL Server after a reboot?

  - by MerlinMags

  Our server was rebooted after a Windows Update scheduled for 1am, but after the restart SQL Server did not start up, so our websites were unable to display. Usually this process happens with no manual intervention. Is there a log somewhere which might indicate the reason why the Windows startup process did not call SQL Server to get going again? I've looked in the Event Viewer (Application Log) and SQL's own file E:\MSSQL\MSSQL10.MSSQLSERVER\MSSQL\Log\ERRORLOG* but these only contain records of successful startup operations....nothing mentions a failed attempt to start a service or anything like that.

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• Datenbank in a Box

  - by A&C Redaktion

  Die Oracle Database Appliance: ein zuverlässiges, einfach zu bedienendes und erschwingliches Datenbank-System. Endlich kommt ein Datenbanksystem auf den Markt, das auf die Bedürfnisse kleinerer Unternehmen zugeschnitten ist: Oracle Database Appliance (ODA). Nicht jeder, der große Datenmengen zu verwalten hat, kann schließlich gleich zu Exadata und Co. greifen. Die kompakte „Datenbank in a Box“ kombiniert Software, Server und Speicherkapazität und bietet diverse Vernetzungsmöglichkeiten. Sie beinhaltet zwei geclusterte SunFire-Server, die unter Oracle Linux laufen, vorinstalliert ist eine Oracle Database 11g Release 2. Einer der großen ODA-Vorteile: Die Datenbank wächst mit den Bedürfnissen des Unternehmens: Die Leistungsfähigkeit des Clusters lässt sich anpassen, indem per "Pay-as-you-grow" Software-Lizensierung sukzessive zwei bis 24 Cores freigeschaltet werden können. Sie bietet außerdem hohe Verfügbarkeit für Eigen- und Standard-OLTP sowie universelle Datenbanken, auch in großer Anzahl. Für den Schutz vor Server- und Speichersystemausfällen sorgen Oracle Real Application Clusters, beziehungsweise Oracle Automatic Storage Management. Proaktive Systemüberwachung, Software-Bereitstellung auf einen Klick, integrierte Patches über den gesamten Stack und ein automatischer Call-Home bei Hardware-Ausfällen sparen Kosten und Ressourcen bei der Instandhaltung. Über das Oracle PartnerNetzwerk steht Kunden eine große Anzahl an branchenübergreifenden und -spezifischen Anwendungen zur Verfügung, die von der besseren Verfügbarkeit der Oracle Database Appliance profitieren. Auch die Fachpresse setzt sich mit der neuen Oracle Database Appliance auseinander: Ausführlich berichten unter anderem die Computerwoche und heise online. Das Admin-Magazin bietet eine kurze aber treffende Übersicht. Eine ebenfalls anschauliche, etwas ausführlichere Darstellung bietet die Webseite von DOAG e.V. Im Webcast zur Oracle Database Appliance geht Judson Althoff unter anderem auf deren Bedeutung für das Partner-Business ein:

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• Exchange 2007 Email Address Policies

  - by Ryan Migita

  We have recently upgraded to Exchange 2007 (from 2003) and have noticed the change from recipient policies to email address policies. We have two separate domains (let's call them domaina.com and domainb.com) we receive email for, have email address policies and both email address policies are not applied. In our Exchange 2003 environment, domaina.com was the default email address when we created new mailboxes and due to the migration, domainb is the default (and its email address policy is a higher priority). Now, when we create a new mailbox (or edit existing ones), the primary email address becomes domainb.com. Now the question is, is this as simple as putting the email address policies in the correct order? Do I have to apply both policies? What effect will the above changes make to existing mailboxes? Since we do not have any conditions set on the policies, I assume prior to making these changes, I should force all domainb mailboxes to not automatically update email address based on policy? Thanks in advance!

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• SSH: one user logs in, other don't

  - by Co Lega

  Some users can ssh correctly, others don't. I have an admin user, which is in wheel. I used vsftpd for allowing FTP. I created a nologin user for FTP. Call this user "ftpuser". Now I want to allow sftp. It allows me to connect using admin user. I remove the nologin, by giving the user a shell via usermod -s /bin/bash ftpuser. It still doesn't allow me to connect from the ftpuser via sftp. The content of /home/ftpuser/.ssh is just the known_hosts file which contains "localhost" entry only. User permissions are (in theory) ok: ls -la /home working (admin) : drwx------ 18 admin admin 4096 Feb 6 15:33 admin non-working(ftpuser): drwx------ 3 ftpuser ftp 4096 Mar 26 15:25 ftpuser I haven't configured anything special on openssh. Does the ftpuser need anything extra than shell to enter via ssh?

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• Icon on user account desktop before the user has logged in.

  - by JHamill

  Currently working on a Windows 7 deployment project and I have a requirement to place an RDP icon on a specific users desktop, lets call this user 'Guest'. The image itself will be completely vanilla and all user accounts will be created using commands in the Unattend file. The 'Guest' account will not be a local admin and so it will not be the account used for autologon during the application of the unattend file. As a result of this, the 'Guest' profile will not have been created so I'm unable to simply place the icon at C:\Users\Guest\Desktop. Is there a way to place an icon on this specific users desktop prior to logging in with it? I know there are ways around this i.e. include this account in the base image and log in with it in order to create the profile but I'd like to keep the base image as vanilla as possible. Any ideas or pointers would be greatly appreciated. Thanks in advance.

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• Are short abbreviated method/function names that don't use full words bad practice or a matter of style?

  - by Alb

  Is there nowadays any case for brevity over clarity with method names? Tonight I came across the Python method repr() which seems like a bad name for a method to me. It's not an English word. It apparently is an abbreviation of 'representation' and even if you can deduce that, it still doesn't tell you what the method does. A good method name is subjective to a certain degree, but I had assumed that modern best practices agreed that names should be at least full words and descriptive enough to reveal enough about the method that you would easily find one when looking for it. Method names made from words help let your code read like English. repr() seems to have no advantages as a name other than being short and IDE auto-complete makes this a non-issue. An additional reason given in an answer is that python names are brief so that you can do many things on one line. Surely the better way is to just extract the many things to their own function, and repeat until lines are not too long. Are these just a hangover from the unix way of doing things? Commands with names like ls, rm, ps and du (if you could call those names) were hard to find and hard to remember. I know that the everyday usage of commands such as these is different than methods in code so the matter of whether those are bad names is a different matter.

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• Faster 2D Collision detection

  - by eShredder

  Recently I've been working on a fast-paced 2d shooter and I came across a mighty problem. Collision detection. Sure, it is working, but it is very slow. My goal is: Have lots of enemies on screen and have them to not touch each other. All of the enemies are chasing the player entity. Most of them have the same speed so sooner or later they all end up taking the same space while chasing the player. This really drops the fun factor since, for the player, it looks like you are being chased by one enemy only. To prevent them to take the same space I added a collision detection (a very basic 2D detection, the only method I know of) which is. Enemy class update method Loop through all enemies (continue; if the loop points at this object) If enemy object intersects with this object Push enemy object away from this enemy object This works fine. As long as I only have <200 enemy entities that is. When I get closer to 300-350 enemy entities my frame rate begins to drop heavily. First I thought it was bad rendering so I removed their draw call. This did not help at all so of course I realised it was the update method. The only heavy part in their update method is this each-enemy-loops-through-every-enemy part. When I get closer to 300 enemies the game does a 90000 (300x300) step itteration. My my~ I'm sure there must be another way to aproach this collision detection. Though I have no idea how. The pages I find is about how to actually do the collision between two objects or how to check collision between an object and a tile. I already know those two things. tl;dr? How do I aproach collision detection between LOTS of entities? Quick edit: If it is to any help, I'm using C# XNA.

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