I had to jump through a few hoops..
I tried the obvious “sudo gem install activerecord”, but it gave an error – it needs to install the i18n gem, but that needs rubygems version >= 1.3.6, and I had rubygems 1.3.5.
So I had to upgrade rubygems first, which would normally be :
sudo gem update --system
but that reports that it’s been disabled on Debian, and directs you to use apt-get instead (which doesn’t have a better version). So I had to use the gem-updater gem:
sudo gem install rubygems-update
after which I had rubygems 1.3.7. Then I could get active record:
sudo gem install activerecord
I still needed to get the mysql gem installed, which in turn needed the libmysql-dev stuff installed
sudo apt-get install libmysqlclient15-dev
sudo gem install mysql
Alestic and Canonical have released new Ubuntu AMIs for EC2 – the EBS version in the eu-west-1 region has AMI ID “ami-38bf954c”, and the source is “099720109477/ebs/ubuntu-images/ubuntu-lucid-10.04-i386-server-20100827”.
Ubuntu images support CloudInit, which runs scripts on startup to allow you to configure the server (set up ssh keys, update the repos etc). There’s a load of different ways to specify what should get run (see https://help.ubuntu.com/community/CloudInit for full details).
One of the simplest is just to give it a script in the User Data, like this:
echo "Hello World. The time is now $(date -R)!" | tee /root/output.txt
It runs as the root user, so you can do pretty much anything you want to configure the box.