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• Options for header in raw byte file.

  - by Tim

  I have a large raw data file (up to 1GB) which contains raw samples from a USB data logger. I need to store extra information relating to the file (sample rate, description, trigger point, last seek position etc) and was looking into adding this as a some sort of header. The header file should ideally be human readable and flexible so I've so far ruled out some sort of binary serialization into a header. I also want to avoid two separate files as they could end up separated when copied or backed up. I remembered somebody telling me that newer *.*x Microsoft Office documents are actually a number of files in a zip. Is there a simple way to achieve this? Could I still keep the quick seek times to the raw file?

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• Click-Once deployment is leaving multiple versions (yes, more than 2)

  - by Clyde

  I've got a click once application that is leaving all old versions on my disk. It's an internal corporate application that gets frequent updates, so this is a disaster for rapidly inflating our backup size. According to the docs and other SO questions, it is supposed to only leave the current and previous versions on disk. However, each time I deploy the project and upgrade a client, I get another copy of all exe/dll/data files. I'm making no changes whatsoever to the application, just pushing deploy again in Visual Studio. Any ideas? Updates: The problem seems to happen on both Windows 7 and XP. 64 bit windows and 32. I've done a diff of the folders where the version is installed and the following files are different: MyApp.exe.manifest MyApp.exe.cdf-ms MyDll1.cdf-ms MyDll2.cdf-ms No actual executable files are different, nor the MyApp.manifest, MyDll1.manifest, etc.

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• Playing around with my Java project in Eclipse... what the crap did I just do?

  - by Daddy Warbox

  I don't even remember how, but somehow I managed to make all of my project's source files hidden in Eclipse's Package and Project Explorer panels. Go figure. 'Show Filtered Children (alt+click)' temporarily reveals the files, and only in Package Explorer can I double-click to reopen them from this view. They go back into hiding after I select another item, though. Plus, now I'm getting other annoyances, such as all of the folded non-hidden items altogether expanding when I click on an item, and the entire folder tree of my project now being shown in these panels (including my .svn subversion folders... which shouldn't be any of Eclipse's business, presently). Long story short, my Package/Project Explorers' just blew up on me, and I want to know how to fix this. Thanks in advance. P.S. What's a good guide I can use to learn my way around this silly contraption, anyway?

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• Plot multiple files

  - by LucaB

  Hi I'd like to make an animation that illustrates the positions of some agents I'm simulating under Linux. Basically, I have some files named file00001.dat, file00002.dat and so on. I have to generate "something" that get files in order, and output an animated gif, a dynamic graph or whatever, that simulates the moving reading data from file. I have control on the files, meaning that I can put identifiers or everything I want. How would you achieve that? What programs would you use?

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• rsync useful w/ encrypted files?

  - by barrycarter

  Is rsync efficient for transferring encrypted files? More specifically: I encrypt 'x' with my public key and call the result 'y'. I rsync 'y' to my backup server. 'x' changes slightly I encrypt the modified 'x' and rsync the modified 'y' to my backup server. Is this efficient? I know a small change in 'x' yields a large change in 'y', but is the change localized? Or has 'y' changed so thoroughly that rsync is not much better than scp? I currently backup my "critical" files by tarring/bzipping them nightly, then encrypting the .tar.bz file and rsync'ing it to my backup server. Many of the individual files don't change, but, of course, the tar file changes if even one of the files change. Is this efficient? Should I be encrypting and backing up each file individually? That way, unchanged files will take no time to rsync.

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• Best tools to create valid XML files from an Excel file

  - by systempuntoout

  I need to create a script that extracts some data from a complex Excel 2003 file (with multiple Sheets and different tables inside a single sheet) and produces different XML files that need to be validated against a given XSD file. My preferred language is Python; to create and validate XML files i would go with lxml. What do you suggest for parsing XSL files? Is xlrd the right tool to use for complex Excel files? Or do i need to convert all the sheets in CSV manually, and read files line by line, splitting and getting data? I accept C#, VB6 suggestions too.

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• configuration in IOS MDM

  - by PhuongMaruko

  I'm reading some docs about MDM. According to "Moile device management protocol" document, server can set config for managed devices by installing profile files onto devices. Things that can config in that file are described in https://developer.apple.com/library/ios/featuredarticles/iphoneconfigurationprofileref/Introduction/Introduction.html. My Questions are: if server install 2 profiles that have different config for the same thing, what will happen? "Moile device management protocol" documents also mention about "Managed App Configuration and Feedback". So what is different between the previous config file with this function of server. Is "Managed App Configuration and Feedback" just for specific app, not for the whole device as profile files. which fields can be config via "Managed App Configuration and Feedback" of MDM? Thank all!

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• Sending a large file over network continuously

  - by David Parunakian

  Hello, We need to write software that would continuously (i.e. new data is sent as it becomes available) send very large files (several Tb) to several destinations simultaneously. Some destinations have a dedicated fiber connection to the source, while some do not. Several questions arise: We plan to use TCP sockets for this task. What failover procedure would you recommend in order to handle network outages and dropped connections? What should happen upon upload completion: should the server close the socket? If so, then is it a good design decision to have another daemon provide file checksums on another port? Could you recommend a method to handle corrupted files, aside from downloading them again? Perhaps I could break them into 10Mb chunks and calculate checksums for each chunk separately? Thanks.

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• Lib Files and Defines

  - by Paul

  I'm using a couple of external libraries and I'd rather not have to include all their source and header files in my main source directory or in my project file. One option would be to compile the libraries as lib files and link them like that. However I'm not sure the defines get evaluated before or after the lib file gets created (which one is it?). If it's before then obviously I can't just pack them because they might not work properly on different compilers or systems. So if I can't pack the libraries as lib files, is there any way for me to link in the c or cpp source files? Probably not, since they would have to be compiled first, but maybe I'm wrong. Edit: Here's a follow-up question, based on answers. Do you think it'd be too much of a hassle to have a makefile that creates the lib files? I'd still rather not add the sources to my project or in my source directory.

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• .htaccess for multiple application in Kohana V3

  - by khairil

  Hi I have setup multiple application in Kohana v3, it works normally without enabling .htaccess (to remove index.php or admin.php) my setup + system/ + modules/ + applications/ + public/ + bootstrap.php + ... + admin/ + bootstrap.php + ... + index.php (for 'public' application) + admin.php (for 'admin' application) so to access the frontend sample url will be; http://mydomain.com/index.php/(controller_name)/... and to access administration site; http://mydomain.com/admin.php/(controller_name)/... The task is, I want to remove and replace index.php (default url) and admin.php with /admin/ using .htaccess (mod_rewrite) so it can be http://mydomain.com/(controller_name) <- 'public' application http://mydomain.com/admin/(controller_name) <- 'admin' application my current .htaccess (not working) is; # Turn on URL rewriting RewriteEngine On # Installation directory RewriteBase /ko3/ # Protect hidden files from being viewed Order Deny,Allow Deny From All # Protect application and system files from being viewed RewriteRule ^(?:web-apps|modules|core)\b.* index.php/$0 [L] # Allow any files or directories that exist to be displayed directly RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d # TODO: rewrite admin URL to admin.php/URL #RewriteRule ^admin/(.*) admin.php/$0 [L] # Rewrite all other URLs to index.php/URL RewriteRule .* index.php/$0 [PT]

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• mysql - multiple where and search

  - by Shamil

  I'm trying to write a SQL query that satisfies multiple criteria. Of these, most are connected via a column, so joins are possible, however, some queries are such that I'd have to search additional tables for the information. What would be the least expensive and best way to do this? Let's say that we have a few tables. One table contains information such as sales information for a server: the salesperson, client id, service lease term, timestamps etc. It is possible that a client has multiple sales but with a different "service". I'd need to pick up all of the different ones. Another table has the quotes for the services, I'd need to pick some information out about this, whilst another, which could be joined to this one has some more information. Those tables are linked by a common client ID, so joins are possible, but I'd also need to search the first table for multiple instances of the client ID. Of course, I'd want to restrict the search to certain timestamps, which I can easily do as the timestamps are stored in MySQL format.

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• Flash CS4/AS3 Writing local file from local game without save dialog prompt?

  - by dragonridingsorceress

  I'm writing a game to be run locally, on the user's computer. NOT over the internet. I want to have a file that will hold the usernames and avatar indices (they're in an array). I want to know if there's a way to write to files through Flash with AS3. I'm using CS4. I'd also like to know if you can delete files through Flash, though that's just optional. Thanks in advance for any help you can give.

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• PHP Zip Archive sporadically creating multiple files

  - by user516558

  I have a PHP script (running PHP 5.2 on Apache 2.2) that creates a zip archive of files for a user to download. Everything seems to work just fine; the only issue I have is that periodically multiple files will be created before the ZIP archive is successfully finished. Example: archive-name.zip archive-name.zip.a09600 archive-name.zip.b09600 archive-name.zip.c09600 This does not happen every single time; only periodically - the file is still created but sometimes these extra 'files' are left on the server after it finishes. The code that creates the ZIP archive is as follows: $zip_archive = new ZipArchive(); $zip_archive->open($archiveFullName,ZIPARCHIVE::CREATE); if(!file_exists($archiveFullName)) { foreach ($completed_file_arr as $zip_file) { $isFiller = substr($zip_file,-8) == "_err.txt"; if(!$isFiller) { $zip_archive->addFile($zip_file,$localname); } else $zip_archive->addFromString ($zip_file, "The requested source file could not be found."); } } while(!$zip_archive->close()) sleep(1); //ensure that the ZIP file finishes closing

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• CodeIgniter - Returning multiple file upload details

  - by Chris

  Hey All, Im using the codeigniter upload library to upload multiple files, which works fine ... What im having problems with is returning the information about the files. Im using the following code to print the results for testing echo '<pre>'; print_r($this->upload->data()); echo '</pre>'; A cut down version of the results are as follows Array ( [file_name] => Array ( [0] => filename1.gif [1] => filename2.jpg ) ) The way my view is setup, is that i use jquery to insert multiple dynamic file input fields so the amount of files can be 1, it can be 50 and so on. Im wondering how i would loop through that array to send each filename to the database

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• mysql count(*) left join group by - the number of files in a folder

  - by Flavius

  Hi I have the following tables CREATE TABLE `files` ( `fileid` int(11) NOT NULL AUTO_INCREMENT, `filename` varchar(255) NOT NULL, `filesize` int(11) NOT NULL, `folder` int(11) NOT NULL, PRIMARY KEY (`fileid`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; CREATE TABLE `folders` ( `directoryid` int(11) NOT NULL AUTO_INCREMENT, `directoryname` varchar(255) NOT NULL, PRIMARY KEY (`directoryid`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8; How to get a list of all folders and the number of files they hold, including folders who have no (zero) files? Recursion must not be taken into account. Found it select folders.directoryid, folders.directoryname, count(files.fileid) as no_files from folders left join files on files.folder = folders.directoryid group by folders.directoryid, folders.directoryname I hope it will help someone.

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• How to move many files in multiple different directories (on Linux)

  - by user1335982

  My problem is that I have too many files in single directory. I cannot "ls" the directory, cos is too large. I need to move all files in better directory structure. I'm using the last 3 digits from ID as folders in reverse way. For example ID 2018972 will gotta go in /2/7/9/img_2018972.jpg. I've created the directories, but now I need help with bash script. I know the IDs, there are in range 1,300,000 - 2,000,000. But I can't handle regular expressions. I wan't to move all files like this: /images/folder/img_2018972.jpg -> /images/2/7/9/img_2018972.jpg I will appreciate any help on this subject. Thanks!

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• Need Multiple Sudoku Solutions

  - by user1567909

  I'm trying to output multiple sudoku solutions in my program. For example, when You enter this as input: 8..6..9.5.............2.31...7318.6.24.....73...........279.1..5...8..36..3...... .'s denote blank spaces. Numbers represent already-filled spaces. The output should be a sudoku solution like so: 814637925325149687796825314957318462241956873638274591462793158579481236183562749 However, I want to output multiple solutions. This would be all the solutions that should be printed: 814637925325149687796825314957318462241956873638274591462793158579481236183562749 814637925325941687796825314957318462241569873638472591462793158579184236183256749 834671925125839647796425318957318462241956873368247591682793154579184236413562789 834671925125839647796524318957318462241956873368247591682793154519482736473165289 834671925125839647796524318957318462241965873368247591682793154519482736473156289 But my program only prints out one solution. Below is my recursive solution to solving a sudoku solution bool sodoku::testTheNumber(sodoku *arr[9][9], int row, int column) { if(column == 9) { column = 0; row++; if(row == 9) return true; } if(arr[row][column]->number != 0) { return testTheNumber(arr, row, column+1); } for(int k = 1; k < 10; k++) { if(k == 10) { arr[row][column]->number = 0; return false; } if(rowIsValid(arr, k, row) && columnIsValid(arr, k, column) && boxIsValid(arr, k, row, column)) { arr[row][column]->number = k; if(testTheNumber(arr, row, column+1)==true) { return true; } arr[row][column]->number = 0; } } return false; } Could anyone help me come up with a way to print out multiple solutions? Thanks.

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• How to find out how namespace got polluted?

  - by dehmann

  Consider the following little piece of code: // all of these include other headers, lots of code: #include "myheader1.h" #include "myheader2.h" #include <string> void foo() { string s("hello world"); // oh no, why does this compile?? } This compiles, so obviously some of the recursively included header files has a using namespace std; somewhere. How would you go about finding out where that offending line of code is? Just using grep on all header files won't really work because that statement is often used inside a function, where it is safe and won't pollute the rest of the code.

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• Will the program installed in a folder function properly if I remove the write permission in linux? [on hold]

  - by Kevin Powell

  I have a user account on a cluster( a server), and can only install program like python on the home folder. In case I might accidentally delete the bin, lib, share,include folders coming with the installation of python on the home folder. I change the permissions of the above folder like this chmod -w folder but I am worried when the program need to write/delete some files of the folders, it might not function because the removal of write permission. Am I right? or I the run, including write files in the folder, of a program have permissions different than the permission of user. BTW, is there a way to hide the folders without changing the names?

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• Authenticating Apache HTTPd against multiple LDAP servers with expired accounts

  - by Brian Bassett

  We're using mod_authnz_ldap and mod_authn_alias in Apache 2.2.9 (as shipped in Debian 5.0, 2.2.9-10+lenny7) to authenticate against multiple Active Directory domains for hosting a Subversion repository. Our current configuration is: # Turn up logging LogLevel debug # Define authentication providers <AuthnProviderAlias ldap alpha> AuthLDAPBindDN "CN=Subversion,OU=Service Accounts,O=Alpha" AuthLDAPBindPassword [[REDACTED]] AuthLDAPURL ldap://dc01.alpha:3268/?sAMAccountName?sub? </AuthnProviderAlias> <AuthnProviderAlias ldap beta> AuthLDAPBindDN "CN=LDAPAuth,OU=Service Accounts,O=Beta" AuthLDAPBindPassword [[REDACTED]] AuthLDAPURL ldap://ldap.beta:3268/?sAMAccountName?sub? </AuthnProviderAlias> # Subversion Repository <Location /svn> DAV svn SVNPath /opt/svn/repo AuthName "Subversion" AuthType Basic AuthBasicProvider alpha beta AuthzLDAPAuthoritative off AuthzSVNAccessFile /opt/svn/authz require valid-user </Location> We're encountering issues with users that have accounts in both Alpha and Beta, especially when their accounts in Alpha are expired (but still present; company policy is that the accounts live on for at a minimum of 1 year). For example, when the user x (which has en expired account in Alpha, and a valid account in Beta), the Apache error log reports the following: [Tue May 11 13:42:07 2010] [debug] mod_authnz_ldap.c(377): [client 10.1.1.104] [14817] auth_ldap authenticate: using URL ldap://dc01.alpha:3268/?sAMAccountName?sub? [Tue May 11 13:42:08 2010] [warn] [client 10.1.1.104] [14817] auth_ldap authenticate: user x authentication failed; URI /svn/ [ldap_simple_bind_s() to check user credentials failed][Invalid credentials] [Tue May 11 13:42:08 2010] [error] [client 10.1.1.104] user x: authentication failure for "/svn/": Password Mismatch [Tue May 11 13:42:08 2010] [debug] mod_deflate.c(615): [client 10.1.1.104] Zlib: Compressed 527 to 359 : URL /svn/ Attempting to authenticate as a non-existant user (nobodycool) results in the correct behavior of querying both LDAP servers: [Tue May 11 13:42:40 2010] [debug] mod_authnz_ldap.c(377): [client 10.1.1.104] [14815] auth_ldap authenticate: using URL ldap://dc01.alpha:3268/?sAMAccountName?sub? [Tue May 11 13:42:40 2010] [warn] [client 10.1.1.104] [14815] auth_ldap authenticate: user nobodycool authentication failed; URI /svn/ [User not found][No such object] [Tue May 11 13:42:40 2010] [debug] mod_authnz_ldap.c(377): [client 10.1.1.104] [14815] auth_ldap authenticate: using URL ldap://ldap.beta:3268/?sAMAccountName?sub? [Tue May 11 13:42:44 2010] [warn] [client 10.1.1.104] [14815] auth_ldap authenticate: user nobodycool authentication failed; URI /svn/ [User not found][No such object] [Tue May 11 13:42:44 2010] [error] [client 10.1.1.104] user nobodycool not found: /svn/ [Tue May 11 13:42:44 2010] [debug] mod_deflate.c(615): [client 10.1.1.104] Zlib: Compressed 527 to 359 : URL /svn/ How do I configure Apache to correctly query Beta if it encounters an expired account in Alpha?

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• Splitting an internet connection between multiple separate subnetworks

  - by pythonian4000

  Problem I have an internet connection that I want to split between four separate networks. My requirements are: I need to be able to monitor the amount of bandwidth and data being used by each network, and notify or control as necessary. The four networks should only be able to connect to the internet, not each other. My parents need to be able to operate it, so it needs a simple, preferably Windows-based GUI. Progress so far Server I have a mini-ITX server with six Gigabit ethernet ports - one for the ethernet internet connection, one for each of the four networks, and one for remote access to the server for administration. Bandwidth control I spent a long time researching solutions here. The majority of the control systems/software I found could control bandwidth usage via QOS, but could not monitor or control the amount of data being used. Eventually I found the SoftPerfect Bandwidth Manager, which has everything I need in terms of monitoring and control - per-interface quota management, usage statistics, a web interface for checking usage, and email notifications when quotas are exceeded. It is also Windows-based and has a simple GUI. Internet sharing This is where I am having issues. I am currently using Windows XP Pro SP2 for the server (yes, I know this is far from ideal, but it's the only spare Windows OS I currently have). I can't use the built-in Internet Connection Sharing for several reasons: The upstream internet router has an IP of 192.168.0.1 which ICS clashes with, and I cannot change the router settings. ICS can only share an internet connection with a single interface, but I have four. I have tried bridging the four network cards, but then the Bandwidth Manager cannot see the four individual interfaces - it only sees the bridge. I have tried setting up Dual DHCP DNS server (and am having issues getting DHCP offers to be received by clients), but that would still require gateway software of some sort, which I have been unable to find. My current attempt is to use OpenVPN, with a server for the internet NIC and a separate client for each of the four networks. My thought is that I could bridge the OpenVPN TAP devices to each NIC, meaning that the Bandwidth Manager would control traffic from the bridge instead of the interface. I have not made much progress here though - I've never used OpenVPN before. Questions Is there a Windows software package that does everything I need? (Unlikely, I know) Is there a Windows software package that will share internet between multiple NICs without bridging? Are either of my about attempts feasible? Would it help to have a newer/server version of Windows? Is there a non-Windows alternative that is easy to use?

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• shell script to start multiple Java programs from a directory at boot

  - by zcourts

  I'm not sure if this is the best approach to this, It's my first time doing all of this (including writing shell scripts). OS: Centos My problem: I want to start multiple shell scripts at boot. One of the shell scripts is to start my own services and 3 others are for third party services. The shell script to start my own services will be looking for jar files. I currently have two services (will change), written in Java. All services are named under convention prefix-service-servicename What I've done: I created the following directory structure /home/username/scripts init.sh boot/ boot/startthirdprtyservice1.sh boot/startthirdprtyservice2.sh boot/startthirdprtyservice3.sh boot/startmyservices.sh /home/username/services prefix-lib-libraryname.jar prefix-lib-libraryname.jar prefix-service-servicename.jar prefix-service-servicename.jar prefix-service-servicename.jar In init.sh I have the following: #!/bin/sh #This scripts run all executable scripts in the boot directory at boot #done by adding this script to the file /etc/rc.d/rc.local #nohup #run-parts /home/username/scripts/boot/* #for each file in the boot dir... # ignore the HUP (hangup) signal for s in ./boot/*;do if [ -x $s ]; then echo "Starting $s" nohup $s & fi done echo "Done starting bootup scripts " echo "\n" In the script boot/startmyservices.sh I have #!/bin/sh fnmatch () { case "$2" in $1) return 0 ;; esac ; return 1 ; } ##sub strin to match for SUBSTRING="prefix-service" for s in /home/username/services/*;do if [ -x $s ]; then #match service in the filename , i.e. only services are started if fnmatch "$SUBSTRING" "$s" ; then echo "Starting $s " nohup $s & fi fi done echo "Done starting Services" echo "\n" Finally: Usually you can stick a program in /etc/rc.d/rc.local for it to be run at boot but I don't think this works in this case, or rather I don't know what to put in there I've just learnt how to do this by reading up a bit so I'm not sure its particularly the best thing to do so any advice is appreciated. When I run init.sh nohup.out contains Starting the thirdparty daemon... thirdparty started... .... but nothing from myservices.sh and my Java services aren't running I'm not sure where to start debugging or what could be going wrong. Edit Found some issues and got it to work, used -x instead of -n to check if the string is none zero, needed the sub string check to also be if [[ $s = $SUBSTRING ]] ; then and this last one was just stupid, missing java -jar in front of $s Still unsure of how to get init.sh to run at boot though

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• Multiple SSL Certificates Running on Mac OS X 10.6

  - by frodosghost.mp

  I have been running into walls with this for a while, so I posted at stackoverflow, and I was pointed over here... I am attempting to setup multiple IP addresses on Snow Leopard so that I can develop with SSL certificates. I am running XAMPP - I don't know if that is the problem, but I guess I would run into the same problems, considering the built in apache is turned off. So first up I looked into starting up the IPs on start up. I got up an running with a new StartupItem that runs correctly, because I can ping the ip address: ping 127.0.0.2 ping 127.0.0.1 And both of them work. So now I have IP addresses, which as you may know are not standard on OSx. I edited the /etc/hosts file to include the new sites too: 127.0.0.1 site1.local 127.0.0.2 site2.local I had already changed the httpd.conf to use the httpd-vhosts.conf - because I had a few sites running on the one IP address. I have edited the vhosts file so a site looks like this: <VirtualHost 127.0.0.1:80> DocumentRoot "/Users/jim/Documents/Projects/site1/web" ServerName site1.local <Directory "/Users/jim/Documents/Projects/site1"> Order deny,allow Deny from All Allow from 127.0.0.1 AllowOverride All </Directory> </VirtualHost> <VirtualHost 127.0.0.1:443> DocumentRoot "/Users/jim/Documents/Projects/site1/web" ServerName site1.local SSLEngine On SSLCertificateFile "/Applications/XAMPP/etc/ssl-certs/myssl.crt" SSLCertificateKeyFile "/Applications/XAMPP/etc/ssl-certs/myssl.key" SetEnvIf User-Agent ".*MSIE.*" nokeepalive ssl-unclean-shutdown <Directory "/Users/jim/Documents/Projects/site1"> Order deny,allow Deny from All Allow from 127.0.0.1 AllowOverride All </Directory> </VirtualHost> In the above code, you can change the 1's to 2's and it is the setup for the second site. They do use the same certificate, which is why they are on different IP addresses. I also included the NameVirtualHost information at the top of the file: NameVirtualHost 127.0.0.1:80 NameVirtualHost 127.0.0.2:80 NameVirtualHost 127.0.0.1:443 NameVirtualHost 127.0.0.2:443 I can ping site1.local and site2.local. I can use telnet ( telnet site2.local 80 ) to get into both sites. But in Safari I can only get to the first site1.local - navigating to site2.local gives me either the localhost main page (which is included in the vhosts) or gives me a Access forbidden!. I am usure what to do, any suggestions would be awesome.

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• PowerDNS CNAME with multiple A records produces unexpected results

  - by bwight

  This problem from what i can tell is isolated to PowerDNS. The servers are running two packages pdns-static-3.0.1-1.i386.rpm and pdns-recursor-3.3-1.i386.rpm on the most recent version of Amazon Linux. The amazon ec2 loadbalancers are assigned a CNAME with multiple hosts. Below is an example of the actual behavior. Notice how the hosts are always in the same order. [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb Expected behavior is round robin for the hosts [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa [root@localhost ~]# host cache.domain.com cache.domain.com is an alias for xxxxx.us-east-1.elb.amazonaws.com. xxxxx.us-east-1.elb.amazonaws.com has address aaa.aaa.aaa.aaa xxxxx.us-east-1.elb.amazonaws.com has address bbb.bbb.bbb.bbb The addresses eventually do swap but it seems to be on a 30 minute cache timer changing the TTL of the record doesn't appear to affect anything. It appears as though the resolver has a cache of the response. This adversely affects my application because all of the load is only being sent to one of the loadbalancers (Availability Zones) so if I have servers in two zones then only one zone is under load at a time. Do you know how I can fix this so that each time the host is resolved the order of the addresses is alternating.

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• Planning trunk capacity for multiple GbE switches

  - by wuckachucka

  Without measuring throughput (it's at the top of the list; this is just theoretical), I want to know the most standard method for trunking VLANs on multiple Gigabit (GbE) switches to a core Layer 3 GbE switch. Say you have three VLANs: VLAN10 (10.0.0.0/24) Servers: your typical Windows DC/file server, Exchange, and an Accounting/SQL server. VLAN20: (10.0.1.0/24) Sales: needs access to everything on VLAN10; doesn't need access to VLAN30 and vice-versa. VLAN20: (10.0.1.0/24) Support: needs access to everything on VLAN10; doesn't need access to VLAN20 and vice-versa. Here's how I think this should work in my head: Switch #1: Ports 2-20 are assigned to VLAN20; all the Sales workstations and printers are connected here. Optional 10GbE combo port #1 is trunked to L3 switch's 10 GbE combo port #1. Switch #2: Ports 2-20 are assigned to VLAN30; all the Support workstations and printers are connected here. Optional 10GbE combo port #1 is trunked to L3 switch's 10 GbE combo port #2. Core L3 switch: Ports 2-10 are assigned to VLAN10; all three servers are connected here. With a standard 10/100 x 24 switch, it'll usually come with one or two 1 GbE uplink ports; carrying over this logic to a 10/100/1000 x 24, the "optional" 10 GbE combo ports that most higher-end switches can get shouldn't really be an option. Keep in mind I haven't tested anything yet, I'm primarily moving in this direction for growth (don't want to buy 10/100 switches and have to replace those within a couple of years) and security (being able to control access between VLANs with L3 routing/packet filtering ACLs). Does this sound right? Do I really need the 10 GbE ports? It seems very non-standard and expensive, but it "feels" right when you think about 40 or 50 workstations trunking up to the L3 switch over 1 GbE standard ports. If say 20 workstations want to download a 10 GB image from the servers concurrently, wouldn't the trunk be the bottleneck? At least if the trunk was 10 GbE, you'd have 10x1GbE nodes being able to reach their theoretical max. What about switch stacking? Some of the D-Links I've been looking at have HDMI interfaces for stacking. As far as I know, stacking two switches creates one logical switch, but is this just for management I/O or does the switches use the (assuming it's HDMI 1.3) 10.2 Gbps for carrying data back and forth?

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