Passenger 2.2.3 came out this week, and while up until now I was using the Ubuntu packages from Brightbox (great blokes, really), I was having some problems with serving caches files and I didn't want to wait for the package to be updated. The package itself can be found on Github if you'd like to see it in more detail.
I used a combination of two guides to get everything working: one at Slicehost's wiki and another blog post by someone whose name may or may not be Johnny Pez.
It can be a little confusing to jump back and forth between the two, so I've posted a compiled set of steps here. After working through this article, you can continue on with the second Slicehost article for setting up the rest of your environment.
I'm going to assume you have Ruby and RubyGems installed. If not, do that first before continuing.
Install the Passenger gem:
sudo gem install passenger
Then you need to build the nginx extension, which will be needed when we compile it.
cd `passenger-config --root`
sudo rake nginx
You'll need to install nginx's prerequisites:
sudo apt-get install libpcre3 libpcre3-dev libpcrecpp0 libssl-dev
Then, download the nginx source and unpack it. Everyone seems to be using the legacy stable version of nginx, and I haven't tried any of the newer ones yet.
tar xzvf nginx-0.6.37.tar.gz
Now we need to configure nginx.
./configure --sbin-path=/usr/local/sbin --with-http_ssl_module \
You can change the configure flags if you want (see the comments on the Slicehost article), but I've left them alone so the rest of Slicehost's articles can be followed without modification.
Assuming the configure succeeded, all that's left is to compile and install.
All Systems Go
To make sure everything is working, start nginx:
Visit your server's IP, and you should see the nginx welcome screen. This is good! Kill nginx:
sudo kill `cat /usr/local/nginx/logs/nginx.pid`
Now continue on with the Slicehost series to complete your nginx configuration. You'll also probably want to mirror the default configuration layout (these articles specify Intrepid, but the steps will be pretty close on most recent versions of Ubuntu).