We always want to make our system easier to use, so we recently launched our new Documentation. You can read more about this in our last blogpost. In this post we will go into the details of how we implemented our docs and where we deploy them.
Problems with Documentation and Current Infrastructure
In the past our documentation was part of our main application. Every change that gets deployed to our main application needs to be thoroughly tested and goes through code review. This made updating our documentation a major pain and very time consuming. It hindered us from getting updates to our docs out quickly.
When we decided to redo our docs we wanted to have them hosted externally. We had some experience with Jekyll in the past, so static pages looked like a great option. We looked into Jekyll and Middleman, but Middleman looked like the better option to us, as it is easier to extend.
Using Static Pages and Amazon S3
Static pages are easy to build and design. We have full control over the layout and no complicated infrastructure is required to serve the pages . Delivering static pages from S3 is cheap and fast, so a good option for our docs.
Deployment to S3 is very easy and everything can be included in a build on Codeship.
Setting up Middleman App
Our documentation is all open source on Github: https://github.com/codeship/docs For our configuration take a look at our config.rb. We use the blog extension as it enables us to do proper permalinks and adds a few other nice options.
To build the middleman app we run
bundle install bundle exec middleman build
which creates a build folder that will be later deployed to S3.
Deploying to Amazon S3
Of course here at Codeship everything is continuously deployed, including our docs. We decided early on to go with static pages hosted on S3, as it is fast, easy and cheap. We wanted to have the documentation on codeship.io/documentation, which meant we had to do proxy the pages through our application. Here’s how we did it.
Installing the Deployment Tools
As a first step we wanted to use the official awscli tool provided by Amazon. They can be installed through pip, so
pip install awscli is all we needed.
AWS Access Keys
To be able to interact with the AWS API we needed to set environment variables. You can do this by simply exporting the following variables (or set them on the Environment tab on Codeship)
AWS_DEFAULT_REGION=us-east-1 AWS_SECRET_ACCESS_KEY=YOUR_SECRET_KEY AWS_ACCESS_KEY_ID=YOUR_ACCESS_KEY
Removing Old Content from our Page
As a next step we wanted to make sure all docs were removed from the S3 bucket before we deployed the new ones, so we wouldn’t run into any left overs.
aws s3 rm s3://docs.codeship.io --recursive
Now the bucket was ready for the new docs.
Deploying to the S3 Bucket
Now we were ready for the deployment step. The following command syncs the build folder Middleman created to S3.
aws s3 sync build s3://docs.codeship.io --acl public-read --cache-control "public, max-age=86400"
As static pages typically don’t change very often we wanted to have caching in place, so the page is loaded quickly. By setting the cache-control header we make sure all parts of our documentation are cached for one day by the browser. The –acl public-read flag makes sure all files in the bucket are accessible for everyone.
Amazon S3 Static Website Hosting
Now that we deployed to our S3 bucket we needed to make sure it is treated as a static website by AWS. In our AWS Console we went to our S3 Bucket and enabled static website hosting.
You can read more about this in the AWS documentation about static website hosting
Setting up Application forwarding
So now we set up our docuemtation to be served through the S3 bucket on http://docs.codeship.io.s3-website-us-east-1.amazonaws.com/documentation/
Now we needed to move it to codeship.io/documentation
In the end we decided to go with rack-reverse-proxy by Jon Swope. In our config.ru we added the following as the first rack middleware:
require 'rack/reverse_proxy' use Rack::ReverseProxy do reverse_proxy /^\/documentation\/?(.*)$/, 'http://docs.codeship.io.s3-website-us-east-1.amazonaws.com/documentation/$1' end
This simply forwards every request to the S3 bucket and returns the result.
Set Asset Host to CDN for HTTPS
We didn’t want assets to be routed through our application, so we set up a cloudfront distribution to server files from the s3 bucket.
It has the added benefit that it works over https as well. In our config.rb we set the asset host:
activate :asset_host, host:'https://d1hmmog0ddn2l5.cloudfront.net'
Using Blitz.io Load Tests
To make sure our reverse proxy works well and doesn’t take down our application we ran a couple of tests through Blitz.io. The results were great, especially considering that those requests would be cached the second time.
Using S3 for static pages made our documentation a lot better. We can change it easily any time while paying absolutely nothing for it. We will definitely use S3 in the future as well for different pages we want to deploy.