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Lately I have been trying to get an openstack node up and running on an Ubuntu VM. For which, I was following a couple of the many guides available online. Everything went well until I found out that I was not able to create a user with an admin role using the nova-manage command. I was trying to run, nova-manage user admin openstack Much to my disappointment, I got the following error,  nova-manage: error: argument category: invalid choice: 'user' (choose from 'version', 'bash-completion', 'project', 'account', 'shell', 'logs', 'service', 'db', 'vm', 'agent', 'cell', 'instance_type', 'host', 'flavor', 'fixed', 'vpn', 'floating', 'network') I was a bit frustrated after going through the wiki for the nova-manage command which said that nova-manage was going away in the Folsom release of openstack, but never said anything about what is go...

I was trying out CodeIgniter  today. I found it quite lightweight and easy to get started with. MVC was fine until I came across a strange issue. Every time I tried to connect to the database, I would end up getting the infamous "500 Internal server error". Unfortunately, even after checking through all http logs, I was not able to trace it to anything that could've gone wrong. I had apache, php, mysql installed and configured correctly. Spent about 4 hours trying out different configurations, playing around with the database names, model names, etc, just to realise later that I did not have the php-mysql driver installed! This time I was on an ubuntu machine, so I had to: apt-get install php5-mysql and then although I could see that apt-get had already restarted apache2 for me, I just thought of doing it myself as well, service apache2 restart and there it was. Everything was working the way I wanted it to be. It was a very silly thing to miss out on this one. I have don...

Today, I was trying to configure nagios to monitor an asterisk setup. I installed the nagios-plugins-check_sip plugin available for CentOS. I also had check_asterisk downloaded from here just to try out both. Now, check_asterisk and check_sip are perl scipts which can be used to monitor an asterisk setup. When run through the command line, they seem to work fine, i.e: given that asterisk or any other sip server is listening and your command is correct, you should get output similar to this: ;SIP/2.0 200 OK, 0.000585 seconds response time, cnt=1 Although, that's exactly what I got, it didn't work the same way through nagios, I was getting the following as the output from the plugin. (Service check did not exit properly) After enabling debug info for nagios, I found this in the logs, HOST: remotehost, SERVICE: Asterisk, CHECK TYPE: Active, OPTIONS: 1, SCHEDULED: Yes, RESCHEDULE: Yes, EXITED OK: No, RETURN CODE: 3, OUTPUT: **ePN failed to compile /usr/lib64/nagios/plugins/chec...

Thought of trying out Drupal 7 after a long time, as much as I had used Drupal 6, I was expecting Drupal 7 to work out of the box for a system which was previously running Drupal 6.I noticed that, for some reason, there were these error messages in my httpd logs: [Wed Jul 25 17:40:13 2012] [error] [client 127.0.0.1] PHP Fatal error:  Class 'DOMDocument' not found in /home/ausmarton/Public/website/drupal-7.7/modules/filter/filter.module on line 1041 Now, since I had worked quite a bit with version 6, I knew that all that needs to be done was this: yum install php-xml and /sbin/service httpd reload  And it did work! Well, so it looks like besides the usual php extensions like php-gd, php-mysql and others, Drupal 7 also needs php-xml to be able to work properly. EDIT: I've tried this with PHP 5.3.11 on Apache 2.2.21.