JEZ HUMBLE CONTINUOUS DELIVERY PDF

In the late 90's I paid a visit to Kent Beck, then working in Switzerland for an insurance company. He showed me around his project and one of the interesting aspects of his highly disciplined team was the fact that they deployed their software into production every night. This regular deployment gave them many advantages: written software wasn't waiting uselessly before it was used, they could respond quickly to problems and opportunities, and the rapid turn-around led to a much deeper relationship between them, their business customer, and their final customers. In the last decade I've worked at ThoughtWorks and a common theme of our projects has been reducing that cycle time between idea and usable software. I see plenty of project stories and they almost all involve a determined shortening of that cycle.

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Continuous Delivery is the ability to get changes of all types—including new features, configuration changes, bug fixes and experiments—into production, or into the hands of users, safely and quickly in a sustainable way.

Our goal is to make deployments—whether of a large-scale distributed system, a complex production environment, an embedded system, or an app—predictable, routine affairs that can be performed on demand. We achieve all this by ensuring our code is always in a deployable state, even in the face of teams of thousands of developers making changes on a daily basis.

It is often assumed that if we want to deploy software more frequently, we must accept lower levels of stability and reliability in our systems. In fact, peer-reviewed research shows that this is not the case—high performance teams consistently deliver services faster and more reliably than their low performing competition. This is true even in highly regulated domains such as financial services and government. This capability provides an incredible competitive advantage for organizations that are willing to invest the effort to pursue it.

Low risk releases. The primary goal of continuous delivery is to make software deployments painless, low-risk events that can be performed at any time, on demand. By applying patterns such as blue-green deployments it is relatively straightforward to achieve zero-downtime deployments that are undetectable to users. Faster time to market. When teams work together to automate the build and deployment, environment provisioning, and regression testing processes, developers can incorporate integration and regression testing into their daily work and completely remove these phases.

We also avoid the large amounts of re-work that plague the phased approach. Higher quality. When developers have automated tools that discover regressions within minutes, teams are freed to focus their effort on user research and higher level testing activities such as exploratory testing, usability testing, and performance and security testing.

By building a deployment pipeline , these activities can be performed continuously throughout the delivery process, ensuring quality is built in to products and services from the beginning. Lower costs. Any successful software product or service will evolve significantly over the course of its lifetime.

By investing in build, test, deployment and environment automation, we substantially reduce the cost of making and delivering incremental changes to software by eliminating many of the fixed costs associated with the release process. Better products. Continuous delivery makes it economic to work in small batches. This means we can get feedback from users throughout the delivery lifecycle based on working software.

Happier teams. Peer-reviewed research has shown continuous delivery makes releases less painful and reduces team burnout. By removing the low-value painful activities associated with software delivery, we can focus on what we care about most—continuously delighting our users.

If this sounds too good to be true, bear in mind: continuous delivery is not magic. Why continuous delivery? The practices at the heart of continuous delivery help us achieve several important benefits: Low risk releases.

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Continuous Delivery: Reliable Software Releases Through Build, Test, and Deployment Automation

Continuous Delivery is the ability to get changes of all types—including new features, configuration changes, bug fixes and experiments—into production, or into the hands of users, safely and quickly in a sustainable way. Our goal is to make deployments—whether of a large-scale distributed system, a complex production environment, an embedded system, or an app—predictable, routine affairs that can be performed on demand. We achieve all this by ensuring our code is always in a deployable state, even in the face of teams of thousands of developers making changes on a daily basis. It is often assumed that if we want to deploy software more frequently, we must accept lower levels of stability and reliability in our systems. In fact, peer-reviewed research shows that this is not the case—high performance teams consistently deliver services faster and more reliably than their low performing competition.

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Continuous Delivery

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Continuous Delivery is a software development discipline where you build software in such a way that the software can be released to production at any time. You achieve continuous delivery by continuously integrating the software done by the development team, building executables, and running automated tests on those executables to detect problems. Furthermore you push the executables into increasingly production-like environments to ensure the software will work in production. To do this you use a DeploymentPipeline. The key test is that a business sponsor could request that the current development version of the software can be deployed into production at a moment's notice - and nobody would bat an eyelid, let alone panic. Continuous Delivery is sometimes confused with Continuous Deployment. Continuous Deployment means that every change goes through the pipeline and automatically gets put into production, resulting in many production deployments every day.

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