Continuous Delivery with Blue/Green Deployment

At thetrainline.com we are always striving to deliver the best user experience for our customers. We want to get great ideas from conception to the customer as quickly as possible, to enhance our offerings and streamline our processes. This post talks about how we helped achieve this by harnessing Continuous Delivery.

Following on from the post (Moving to Multiple Deployments Per Week at thetrainline.com) that Matt Richardson and I published in December 2013 we have since evolved our deployments to allow us to achieve automated continuous delivery of our components from development through to production – with zero downtime.

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Leaving the Platform – Branching and Releasing for Independent Subsystems

For several years, much of the code for the systems at thetrainline.com has been versioned and deployed together as a single ‘platform’. Recently, we have begun to divide up the platform into smaller chunks, to enable us to deliver some parts more frequently and rapidly, leaving other parts to evolve more slowly (as needed). Moving from a single version number for all subsystems to multiple version numbers for independent subsystems has implications for how code is built and released; this blog post outlines some of the work we have done so far in this area.

My colleague Owain Perry and I recently presented on this topic at the London Continuous Delivery meetup group (http://londoncd.org.uk/) and the slides we showed relate to the details in this post:

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