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Articles indexed Friday October 26 2012

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• Passing data between Castle Windsor's Interceptors

  - by Nhím H? Báo

  I'm adopting Castle Windsor for my WCF project and feel really amazed about this. However, I'm having a scenario that I don't really know if Castle Windsor supports. For example I have the following chained Interceptors Interceptor 1 > Interceptor 2 > Interceptor 3 > Interceptor 4 > Real method Interceptor 1 returns some data and I want that to be available in Interceptor 2 Interceptor 2 in turn does it work and returns the data that I want to make avaialbe in the 3,4, interceptor. The real case scenario is that we're having a WCF service, Interceptor 1 will parse the request header into a Header object(username, password, etc.). The latter interceptors and real method will ultilize this Header object. I know that I can use Session variable to transport data, but is it a built-in, more elegant, more reliable way to handle this?

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• Routing error in rails

  - by user662503

  In my controller I have def update_project_dates p "It is end date....." @user=User.find(params[:user]) @projects=Project.find_all_by_user_id(@user) end In the view page (only some part of the code is copied and pasted) eventDrop: function() { $.ajax({ url:'/update_project_dates/', success:function(data) { alert("Hello"); } }) }, In my routes.rb I have mentioned match '/update_project_dates' => 'users#update_project_dates', :method=> :get get 'update_project_dates' But When the ajax request goes, I get the routing error as Routing Error uninitialized constant UsersController Where am I doing wrong here...Please help..

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• stop and split generated sequence at repeats - clojure

  - by fitzsnaggle

  I am trying to make a sequence that will only generate values until it finds the following conditions and return the listed results: case head = 0 - return {:origin [all generated except 0] :pattern 0} 1 - return {:origin nil :pattern [all-generated-values] } repeated-value - {:origin [values-before-repeat] :pattern [values-after-repeat] { ; n = int ; x = int ; hist - all generated values ; Keeps the head below x (defn trim-head [head x] (loop [head head] (if (> head x) (recur (- head x)) head))) ; Generates the next head (defn next-head [head x n] (trim-head (* head n) x)) (defn row [x n] (iterate #(next-head % x n) n)) ; Generates a whole row - ; Rows are a max of x - 1. (take (- x 1) (row 11 3)) Examples of cases to stop before reaching end of row: [9 8 4 5 6 7 4] - '4' is repeated so STOP. Return preceding as origin and rest as pattern. {:origin [9 8] :pattern [4 5 6 7]} [4 5 6 1] - found a '1' so STOP, so return everything as pattern {:origin nil :pattern [4 5 6 1]} [3 0] - found a '0' so STOP {:origin [3] :pattern [0]} :else if the sequences reaches a length of x - 1: {:origin [all values generated] :pattern nil} The Problem I have used partition-by with some success to split the groups at the point where a repeated value is found, but would like to do this lazily. Is there some way I can use take-while, or condp, or the :while clause of the for loop to make a condition that partitions when it finds repeats? Some Attempts (take 2 (partition-by #(= 1 %) (row 11 4))) (for [p (partition-by #(stop-match? %) head) (iterate #(next-head % x n) n) :while (or (not= (last p) (or 1 0 n) (nil? (rest p))] {:origin (first p) :pattern (concat (second p) (last p))})) # Updates What I really want to be able to do is find out if a value has repeated and partition the seq without using the index. Is that possible? Something like this - { (defn row [x n] (loop [hist [n] head (gen-next-head (first hist) x n) steps 1] (if (>= (- x 1) steps) (case head 0 {:origin [hist] :pattern [0]} 1 {:origin nil :pattern (conj hist head)} ; Speculative from here on out (let [p (partition-by #(apply distinct? %) (conj hist head))] (if-not (nil? (next p)) ; One partition if no repeats. {:origin (first p) :pattern (concat (second p) (nth 3 p))} (recur (conj hist head) (gen-next-head head x n) (inc steps))))) {:origin hist :pattern nil}))) }

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• Distributing players to tables

  - by IVlad

  Consider N = 4k players, k tables and a number of clans such that each member can belong to one clan. A clan can contain at most k players. We want to organize 3 rounds of a game such that, for each table that seats exactly 4 players, no 2 players sitting there are part of the same clan, and, for the later rounds, no 2 players sitting there have sat at the same table before. All players play all rounds. How can we do this efficiently if N can be about ~80 large? I thought of this: for each table T: repeat until 4 players have been seated at T: pick a random player X that is not currently seated anywhere if X has not sat at the same table as anyone currently at T AND X is not from the same clan as anyone currently at T seat X at T break I am not sure if this will always finish or if it can get stuck even if there is a valid assignment. Even if this works, is there a better way to do it?

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• Do Portable Class Libraries work with .net 3.5?

  - by Eric

  I am running Windows 8 and have both Visual Studio 2010 Ultimate w/sp1 and Visual Studio 2012 Ultimate and I am trying to create a Portable Class Library that supports .net 3.5 and greater. When I first try to create a PCL I get a screen like this: I noticed that .net 3.5 is not in the list so I clicked on "Install additional frameworks" and found a Targeting Pack for version 3.5. But when I download and run "dotnetfx35setup.exe" nothing happens. And when I go back into VS and try to create a new Portable Class Library, it lists the same target frameworks as before. I have also turned on the Windows Features for .NET Framework 3.5 and am now out of ideas. Here is a screen shot in case I missed something else. Thanks,

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• Future of web services

  - by Landon Ashes

  I want to know what are the possible Future research areas Regarding "Web Services" and in what direction "Web Services" are moving. I am not talking about "Microsoft Web Services". I am talking about "Web Services" in general. I did google but what ever i found was like couple of years old and obsolete. couldnt get any direction from IEEE too. Plz some expert of this line should guide me. I will be obliged like anything. Thanks in Advance.

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• How to turn off Tomcat logging in Eclipse?

  - by kirdie

  I develop a Vaadin project in Eclipse that I start through Tomcat 6 which gets started directly by Eclipse. Tomcat prints an enormous amount of log messages though on each start which makes it hard to see the output of my own Application. I have already replaced all log levels in tomcat6/conf/logging.properties by WARNING (e.g. java.util.logging.ConsoleHandler.level = WARNING) but I still get many INFO messages. How can I turn this off or restrict the log messages to WARNING? An example of the messages Okt 26, 2012 12:16:36 PM org.apache.catalina.core.AprLifecycleListener init INFO: Loaded APR based Apache Tomcat Native library 1.1.24. Okt 26, 2012 12:16:36 PM org.apache.catalina.core.AprLifecycleListener init INFO: APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. Okt 26, 2012 12:16:36 PM org.apache.tomcat.util.digester.SetPropertiesRule begin WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:saim' did not find a matching property. Okt 26, 2012 12:16:37 PM org.apache.coyote.http11.Http11AprProtocol init INFO: Initializing Coyote HTTP/1.1 on http-8080 Okt 26, 2012 12:16:37 PM org.apache.coyote.ajp.AjpAprProtocol init INFO: Initializing Coyote AJP/1.3 on ajp-8009 Okt 26, 2012 12:16:37 PM org.apache.catalina.startup.Catalina load INFO: Initialization processed in 879 ms Okt 26, 2012 12:16:37 PM org.apache.catalina.core.StandardService start INFO: Starting service Catalina Okt 26, 2012 12:16:37 PM org.apache.catalina.core.StandardEngine start INFO: Starting Servlet Engine: Apache Tomcat/6.0.32 Okt 26, 2012 12:16:37 PM org.apache.coyote.http11.Http11AprProtocol start INFO: Starting Coyote HTTP/1.1 on http-8080 Okt 26, 2012 12:16:37 PM org.apache.coyote.ajp.AjpAprProtocol start INFO: Starting Coyote AJP/1.3 on ajp-8009 Okt 26, 2012 12:16:37 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 568 ms

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• windows 2003 - why can't serial port be accessed remotely?

  - by Danny Staple

  we have recently installed the updates on some of our servers, which have a bit of hardware attached via USB that presents itself as a serial (COM) port. The strange behaviour is that if I start a cmd shell on the server via VNC, I can open the serial port. If I run a service and start it from there (telnet, jenkins) then I receive a "not found" error for it. IE: C:\Documents and Settings\some_user>echo 1 >COM4: C:\Documents and Settings\some_user> on the local cmd will work, and on the remote telnet will give: C:\Documents and Settings\some_user>echo 1 >COM4: The system cannot find the file specified. C:\Documents and Settings\some_user> I cannot see any security settings on the Device manager settings panel for this device.

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• central log-server with auditdisp

  - by johan

  I want to setup a central log-server. The log-server is running with debian 6.0.6 and the audit daemon is installed in version 1.7.13-1. The Clients are running with Red Hat 5.5 and they connect to the log-server via audispd. The connection works fine and i get all messages from each node. My questions is: is it possible that the auditd daemon from the log server write the messages from each node in a separate file? I try to transfer the messages via the syslog daemon, that works but i can not use tools like ausearch to analyze these log-files.

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• Apache redirect alias to a different domain

  - by John Magnolia

  I previous had both Web and Mail on the same server and for each of my vhosts/domains, I could visit example.com/mail or foo.com/mail which would display the Roundcube Webmail across all vhosts. E.g Alias /mail "/usr/share/apache2/roundcub/" Although now I have moved the Mail server onto a completely different server and now have a SSL for the main domain. https://mail.example.com which is now the new location of Roundcube for all vhosts/domains. Question: is it possible to redirect all alias for "/mail" from the Web server to the new URL?

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• Sql Server 2008 Create Foreign Key Manually

  - by tgriffiths

  I have inherited an old database which wasn't designed very well. It is a Sql Server 2008 database which is missing quite a lot of Foreign Key relationships. Below shows two of the tables, and I am trying to manually create a FK relationship between dbo.app_status.status_id and dbo.app_additional_info.application_id I am using SQL Server Management Studio when trying to create the relationship using the query below USE myDatabase; GO ALTER TABLE dbo.app_additional_info ADD CONSTRAINT FK_AddInfo_AppStatus FOREIGN KEY (application_id) REFERENCES dbo.app_status (status_id) ON DELETE CASCADE ON UPDATE CASCADE ; GO However, I receive this error when I run the query The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_AddInfo_AppStatus". The conflict occurred in database "myDatabase", table "dbo.app_status", column 'status_id'. I am wondering if the query is failing because each table already contains approximately 130,000 records? Please help. Thanks.

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• Preventing my postfix to send my local users spam

  - by Jack

  I have a postfix/dovecot mail server with 100 different users. When they send an email they need to be authenticated. I successfully use saslauth to achieve this. Few days ago I had a problem. One specific user, probably with a virus or a spam-bot installed in its computer, started to send out through my server thousands of emails in few hours. As result, my ip has been blocked by many isp provider (@aol, @yahoo, and others) and has been listed in many blacklist, making all my 100 users unable to send any email to anyone. What is the best practice to avoid this problem? It would be great if my server could recognize a spamming user and automatically block it. Also, have a limit of, say, 30 emails per hour could be a partial solution. Any idea how to face this problem? Thank you

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• Invalid command 'VirtualDocumentRoot'

  - by andy

  I'm unsure as to why I'm getting the following error when apache is rebooted: Invalid command 'VirtualDocumentRoot', perhaps misspelled or defined by a module not included in the server configuration Action 'start' failed. The snippet it is referring to is this: <VirtualHost *:80> ServerAdmin [email protected] VirtualDocumentRoot /local/www/staging/%1 ServerAlias *.staging.mydomain.com </VirtualHost> I assumed it was a misspelling as it said, but it was copied directly from another server of mine. It works perfect there. Any ideas?

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• Can't access to a iSCSI volume

  - by jmiguel.rodriguez

  I have a iSCSI target on a customer place I'm using from an old Fedora (Core6) server. I configured it and formatted as ext3 (mistake, now I know) and I've been working with it for some time. Now I need to access this volume from other machine. As far as I've read, I can't do it safely from two machines at the same time (yep, that's the first thing I tried). So I've umount it from original server and tried to mount it on the new server (I did it at first with Ubuntu 10 LTS but when I was unable to do it I installed another Fedora with the same configuration) with no success. The problem: I can see all target on NAS but when I do a "fdisk -l" to see all devices and know which mount I see all targets as SFS filesystem. From the original server I see all SFS (after all, they belong to my customer and don't know what he have in) except the one I manage which I see as 'Linux'. What can I do? Thank you in advanced, regards, jmiguel

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• Setting up MySQL database replication [without restarting mysql]

  - by FunkyChicken

  I'm trying to setup MySQL db replication, it seems pretty straight forward. I was using this tutorial: http://www.howtoforge.com/mysql_database_replication Now I run a rather large MySQL database for a very large website, and in this tutorial it asks me to restart MySQL to apply the new settings in the /etc/my.cnf file. I'm try to avoid that step at all costs, as I know that restarting MySQL can take a few minutes on my machine (due to large logs/dbs), and I don't want any downtime. Is there a way to apply the necessary settings WITHOUT fully restarting Mysql?

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• Automount vfat (w95 fat32 LBA) on Centos

  - by cpl

  I'm trying to mount an USB flash drive formatted as w95 fat32 LBA (as reported by dmesg) under Centos. I can easily mount it using the mount command: mount /dev/sdx1 /media/mydrive -t vfat But it seems that the system (Centos 6.3) cannot mount it automatically. It mounts all the other filesystem types automatically. I also installed fuse-ntfs and it correctly mounts NTFS drives. How can I enable automount for vfat partiotions too? Thanks

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• Ruby installed on Ubuntu 10.10 slow on one machine but not other

  - by Aaron Jensen

  I have a machine that was provisioned several months ago. RVM was used to install ruby 1.9.3-p125 as well as 1.9.3-p125-perf. When I compared raw ruby performance to another identical machine the older machine smoked them. For example: ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 3.790000 0.000000 3.790000 ( 3.800895) each 2.410000 0.000000 2.410000 ( 2.420860) any 3.960000 0.000000 3.960000 ( 3.972099) include 1.440000 0.000000 1.440000 ( 1.442862) ------------------------------------ total: 11.600000sec vs ================================================================================ With in-block needle calculation ================================================================================ Rehearsal ---------------------------------------------- detect 10.740000 0.000000 10.740000 ( 10.769366) each 6.080000 0.010000 6.090000 ( 6.106323) any 10.600000 0.000000 10.600000 ( 10.641606) include 4.160000 0.000000 4.160000 ( 4.171530) ------------------------------------ total: 31.590000sec I attempted to reinstall 1.9.3-p125 with rvm on the fast machine and that ruby is now slow. It's as if something changed in RVM, or I installed some package that made compiled versions of ruby perform significantly worse. I know this is a tough question to answer, but what things should I look into in order to track down why the performance has suffered so much? edit I just attempted to install with ruby-build and the version installed was fast. Something rvm is doing to build it in my environment is slow.

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• Linux: how to verify my network configuration before doing a restart

  - by wael34218

  I am trying to build a network bridge for my VMs on a server. So I added a new file and changed another in the /etc/sysconfig/network-scripts directory. Then I did a network reboot with the following command:/etc/init.d/network restart After that the server was not up again. I contacted the hosting provider's support for help. I need a way to verify my new configuration before a network restart. I need to make sure that it will be up again, just like apache's /etc/init.d/httpd configtest

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• RDP add domain users broken

  - by Robuust

  I have 3 servers, - domain controller with dns services - dhcp/rras - file/random server with files stored on it and nothing special so far. All servers have static IP's All servers are in the same domain (SOFTWARE) RDP is enabled for all 3 servers All servers are Windwos Server 2008 R2 I can connect to the DHCP/RRAS server via RDP I cannot connect to DC and File server When I add RPD users (both are domain admin for testing) to the File server they show up like this: What is happening what I don't see? And additional why don't I even get a login screen for RPD? Thanks in advance.

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• Nginx: Loopback connection via PHP's getimage size crashes server (Magento's CMS)

  - by Alex

  We were able to trace down a problem that is crashing our NGINX server running Magento until the following point: Background info: Magento Backend has a CMS function with a WYSIWYG editor. This editor loads some pictures via a controller in magento (cms/directive). When we set the NGINX error_log level to info, we get the following lines (line break inserted for better readability): 2012/10/22 18:05:40 [info] 14105#0: *1 client closed prematurely connection, so upstream connection is closed too while sending request to upstream, client: XXXXXXXXX, server: test.local, request: "GET index.php/admin/cms_wysiwyg/directive/___directive/BASEENCODEDIMAGEURL,,/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9024", host: "test.local" When checking the code in the debugger, the following call does never return (in ´Varien_Image_Adapter_Abstract::getMimeType()` # $this->_fileName is http://test.local/skin/adminhtml/base/default/images/demo-image-not-existing.gif` # $_SERVER['REQUEST_URI'] = http://test.local/admin/cms_wysiwyg/directive/___directive/BASEENCODEDIMAGEURL list($this->_imageSrcWidth, $this->_imageSrcHeight, $this->_fileType, ) = getimagesize($this->_fileName); The filename requests is an URL to the same server which is requesting the script a link to a static .gif that is not existing. Sample URL: http://test.local/skin/adminhtml/base/default/images/demo-image-not-existing.gif When the above line executed, any subsequent request to the NGNIX server does not respond any more. After waiting for around 10 minutes, the NGINX server starts answering requests again. I tried to reproduce the error with a simple test script that only calls getimagesize() with the given URL - but this not crash. It simple leads to an exception saying that the URL could not be loaded (which is fine as the URL is wrong)

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• Configure Nginx to render static files and rewrite file extension or proxy_pass

  - by Pardoner

  I've set up Nginx to handle all my static files else proxy_pass to a Node.js server. It's working fine but I'm having difficulty rewriting the url so that it remove the .html file extension. upstream my_upstream { server 127.0.0.1:8000; keepalive 64; } server { listen 80; server_name staging.mysite.com; root /var/www/staging.mysite.org/public; access_log /var/logs/staging.mysite.org.access.log; error_log /var/logs/staging.mysite.org.error.log; location ~ ^/(images/|javascript/|css/|robots.txt|humans.txt|favicon.ico) { rewrite (.*)\.html $1 permanent; try_files $uri.html $uri/ /index.html; access_log off; expires max; } location / { proxy_redirect off; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_set_header X-NginX-Proxy true; proxy_set_header Connection ""; proxy_http_version 1.1; proxy_cache one; proxy_cache_key sfs$request_uri$scheme; proxy_pass http://my_upstream; } }

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• HP Proliant ML115 G5 - Boot order lost after reboot

  - by Filipe YaBa Polido

  I have one HP Proliant ML 115 G5 (AMD) with the latest BIOS (07-06-2009) and recently I've installed an USB disk. This is a common problem on old Proliant servers. When you plug the USB disk, BIOS boot order changes and tries to boot via USB. So, I'll change the BIOS settings and make the SATA disk the default boot device. The problem is, when I need to unplug the usb disk, and plug it again later. I can't be always changing the BIOS settings... How can one solve this for ever?!?!

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• MySQL query very slow on Amazon RDS but really fast on my laptop?

  - by Luc

  I would love to know if anybody knows why this is happening. i've just migrated over to Amazon RDS for our website and our biggest query which takes .2 seconds to execute on my macbook takes 1.3 seconds to execute on the most expensive RDS instance. Obviously i've disabled query cache (and tested this) on my local computer and both databases are exactly the same. InnoDB, both have the same indexes etc. It's costing us a fortune ($2000 per month) for the fastest RDS instance and i'm losing faith quickly. any ideas?

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• Determining how all memory is used in Windows Server 2008

  - by Mojah

  I have a Windows Server 2008 system, which has 12GB of RAM. If I list all processes in the Task Manager, and SUM() the memory of each process (Working Set, Memory (Private Working Set), Commit Size, ...), I never reach more than 4-5GB that should be "in use". However, task manager reports this server has 11GB in use via the "Performance" tab. I'm failing in determining where all that used RAM is going. It doesn't seem to be system cache, but I can not be sure. It might be a memory leak in one of the appliances, but I'm struggling to find out which one. The server's memory keeps filing up, and eventually forces us to reboot the device to clear it. I've been reading up on how RAM assignments work on Windows Server: RAM, Virtual Memory, Pagefile and all that stuff: http://support.microsoft.com/kb/2267427 What's the best way to measure? http://www.zdnet.com/blog/bott/windows-7-memory-usage-whats-the-best-way-to-measure/1786 Configure the file system cache in Windows: http://smallvoid.com/article/winnt-system-cache.html But I fear I'm stuck without ideas at the moment.

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• Is it possible to have environment variables in the path of the working directory : PS1?

  - by mthpvg

  I am on Lubuntu and I am using bash. My PS1 (in .bashrc) is : PS1="\w> " I like it because I need to paste the working directory all the time. The problem is that the path is always very long and since I use terminator I only have half of my screen's width available to display it... it is ugly and annoying. My command prompt looks like that : /this/is/a/very/long/path/that/i/want/to/make/shorter > I'd like to set in my environment variables : $tiavl=/this/is/a/very/long And then I'll get : $tiavl/path/that/i/want/to/make/shorter > The goal is to have something shorter in the command prompt but I still want to be able to copy paste it and do : cd $tiavl/path/that/i/want/to/make/shorter It is a bit like with $HOME : ~/path/that/i/want/to/make/shorter > I know where I am and I can copy paste the ~. Thanks.

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