Continuous delivery and devops a quickstart guide pdf


It aims at building, continuous delivery and devops a quickstart guide pdf, and releasing software faster and more frequently. The approach helps reduce the cost, time, and risk of delivering changes by allowing for more incremental updates to applications in production.

A straightforward and repeatable deployment process is important for continuous delivery. Continuous delivery, on the other hand, is an approach to automate the delivery aspect, and focuses on bringing together different processes and executing them more quickly and more frequently. Continuous delivery is sometimes confused with continuous deployment.

Continuous deployment means that every change is automatically deployed to production. Continuous delivery means that the team ensures every change can be deployed to production but may choose not to do it, usually due to business reasons.

In order to do continuous deployment one must be doing continuous delivery. Continuous delivery treats the commonplace notion of a deployment pipeline as a lean Poka-Yoke: a set of validations through which a piece of software must pass on its way to release.

Developers used to a long cycle time may need to change their mindset when working in a CD environment. It is important to understand that any code commit may be released to customers at any point. Patterns such as feature toggles can be very useful for committing code early which is not yet ready for use by end users.

Using NoSQL can eliminate the step of data migrations and schema changes, often manual steps or exceptions to a continuous delivery workflow. Other useful techniques for developing code in isolation such as code branching are not obsolete in a CD world, but must be adapted to fit the principles of CD – for example, running multiple long-lived code branches can prove impractical, as a releasable artifact must be built early in the CD process from a single code branch if it is to pass through all phases of the pipeline.

Continuous delivery is enabled through the deployment pipeline. The purpose of the deployment pipeline has three components: visibility, feedback, and continually deploy. All aspects of the delivery system including building, deploying, testing, and releasing are visible to every member of the team to promote collaboration. Team members learn of problems as soon as possible when they occur so that they are able to fix them as quickly as possible.

Through a fully automated process, you can deploy and release any version of the software to any environment. Continuous delivery takes automation from source control all the way through production. There are various tools that help accomplish all or part of this process.

These tools are part of the deployment pipeline which includes continuous delivery. The types of tools that execute various parts of the process include: continuous integration, application release automation, build automation, application lifecycle management.