Adventures in IT

I'm busy writing an application which is heavily dependent on personalized URLs.  Each visitor to the site will have a PURL which I need to communicate to the frontend so that my analytics tags can be associated with the user. Before I go any further I should note that I'm using  Piwik  as my analytics package, and it respects "Do Not Track" requests.  We're not using this to track people, but we are tying it to our clients existing database of their user interests. I want the process of identifying the user to be as magical as possible so that my controllers can stay nice and skinny.  Nobody likes a fat controller right? I decided to use middleware to trap all my web requests to assign a "responder" to the request.  Then I'll use a view composer to make sure that all of the output views have this information readily available. The only snag in this plan was that the Laravel documentation was a little sketchy on how to get the value of the ...

I'm busy migrating an existing server to the cloud and need to replicate the SFTP setup.  They're using a password to authenticate a user and then uploading data files for a web service to consume. YMMV - My use case is pretty specific to this legacy application so you'll need to give consideration to the directories you use. It took a surprising amount of reading to find a consistent set of instructions so I thought I should document the setup from start to finish. Firstly, I set up the group and user that I will be needing: groupadd sftponly useradd -G sftponly username passwd username Then I made a backup copy of and then edited /etc/ssh/sshd_config Right at the end of the file add the following: Match group sftponly ChrootDirectory /usr/share/nginx/html/website_directory/chroot X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp -d /uploads For some reason if this block appears before the UsePAM s...

The cost saving from reserving an EC2 instance is quite dramatic.  This morning I moved two web servers to reserved instances and am dropping my hosting cost by 64% for those servers. There isn't actually any effort required in moving your on demand EC2 instance to a reserved instance.  The only actual change is a billing change, you don't need to do anything in your instance configuration. The only important thing to remember is that you're reserving an instance in a particular availability zone.  The billing effect will only apply to instances launched in the same availability zone. Amazon will apply the discount of having a reserved instance to your invoice automatically.  They provide quite extensive documentation on reserved instances on their site ( here ).

I'm running an nginx server with php5-fpm and was always getting mail in /var/mail/root telling me that the cronjob running usr/lib/php5/maxlifetime was throwing warnings. The warnings were that: PHP Warning:  Module 'mcrypt' already loaded in Unknown on line 0 To fix this I had a look at the file and noticed that it was looping through the various sapi methods and running a command.  The line in the shell script looks like this: for sapi in apache2 apache2filter cgi fpm; do if [ -e /etc/php5/${sapi}/php.ini ]; then So I removed the mcrypt extension from my apache2 php.ini (/etc/php5/apache2/php.ini) and now the maxlifetime shell script runs without throwing warnings.

If you're using a staging server to test your Wordpress changes then you'll be deploying Wordpress to a new domain once your test team gives the go ahead. Unfortunately this can break Wordpress quite badly.  All the links in your content are essentially hard coded into the database content table.  There are settings in the options table that help Wordpress with deciding on redirects. Here are three useful sql statements that will make your life a little easier when migrating.  You can include them as part of your scripted deploy or just run them manually if you don't deploy Wordpress often. Edit them to suit your domain configuration, but they'll help you to change the links and settings in your database to point to the new domain.

Adding new users to Ubuntu is easy because of the convenience tools that exist. Start with the command sudo useradd -d /home/testuser -m testuser This creates the user and sets up a default home directory.  The user doesn't have a password, but you could add one with passwd if you wanted to. Then create a directory .ssh in their home directory.  Create a file called authorized_keys in the directory and copy in contents of the users public key into it. Chown the .ssh directory (and file) to the user and chmod the file to 600.  The directory should be mode 700. Make sure that /etc/sshd_config is set up to deny logging in by password. If you want to set up their bash profile you can copy the ".profile" and ".bashrc" files to their home directory.  Remember to edit /etc/passwd and set their shell to bash. The user should be able to login using their public key by setting up their .ssh/config on their home machine. Host foo HostName server.ip.addres...

Microsoft Happiness I need to use a Windows server to deploy a program I'm busy writing. I kept on getting a problem with Apache starting up that prevented it from including the MS sql server pdo drivers. The message was: the program can't start because msvcp110.dll is missing from your computer. Try reinstalling the program to fix the problem and this usually relates to the Visual C++ Redistributable for Visual Studio 2012 package not being installed. I had previously installed this (it's available on the Microsoft site ) but was still getting the error. Eventually I stumbled on this topic on the Apache friends forum which advised to copy the msvcp110.dll file to both the \xampp\apache\bin and the \xampp\php directories. Apparently Apache wasn't able to follow the OS path to find the file.  In my case it was already in the php directory but not with the other binaries for Apache. After copying it there Apache restarted without errors and the PDO dr...