It is hosted on a LAMP server virtual machine in our production VMware environment. The system has been in daily use (well, week day use) since near the end of 2008 - requiring minimal maintenance in that time (the occasional reboot after security updates have been installed).
Up until yesterday, we had been using Ubuntu 8.04 LTS Server. I decided it was time to move to the latest LTS release - 10.04 - which was released earlier this year and had just received it's first .1 refresh.
Some googling around revealed the potential for various issues with the process so I took a snapshot before beginning - just to be safe.
I then found this link which detailed how to upgrade the server to the next LTS release.
I was shocked at how simple the process appeared to be - surely not?! This is that crazy technical, awful command line operating system with a really high cost of ownership isn't it?
So, SSH'ing into the server, I took a copy of /etc (just being extra safe again), fired up a screen session and ran the command as instructed on the page above.
Various lists were obtained from the internet and upgrades calculated, I then had to press Y to show my acceptance of the results.
Everything slowed down at this point due to our internet connection speed (changing soon, yay!). I disconnected and went to sleep.
This morning, I connected back to the server and screen session to find a reboot necessary. So, Y again and a reboot later the 10.04.1 based system was up and running.
I fired up a browser and pointed to the Jira system - fail. Oh noes, I thought, now it gets difficult.
Well, no, not really. Over the course of various Ubuntu releases since 8.04, the sun-java6-* packages were moved into the partner repository.
So, I uncommented the partner repository in /etc/apt/sources.list, ran an apt-get update and reinstalled the sun-java6-jre package.
A reboot (only to test that everything would start by itself as it should) and Jira is running again, no data lost and inbound email requests to the system are working. Awesome.
Just so you get the significance of that, imagine doing an inplace upgrade (eg not a fresh install) of a Windows 2000 Server running IIS5 and SQL 2000 and have it coming out running Windows Server 2008, IIS7 and SQL 2008.
Two reboots, no data loss, no restores necessary and all done remotely. And Jira was actually still running and available for most of the time except when the box was rebooting and having java re-installed.
Yep, *really* difficult. Watch out.