Continuous deployment

Continuous deployment (CD) is a software engineering approach in which software functionalities are delivered frequently and through automated deployments.[1][2][3] Continuous deployment contrasts with continuous delivery (also abbreviated CD), a similar approach in which software functionalities are also frequently delivered and deemed to be potentially capable of being deployed, but are actually not deployed.[4] As such, continuous deployment can be viewed as a more complete form of automation than continuous delivery.[5]

## Contents

* 1 Motivation
* 2 Example
* 3 See also
* 4 References

## Motivation

A major motivation for continuous deployment is that deploying software into the field more often makes it easier to find, catch, and fix bugs. A bug is easier to fix when it comes from code deployed five minutes ago instead of five days ago. [6]

## Example

In an environment in which data-centric microservices provide the functionality, and where the microservices can have multiple instances, continuous deployment consists of instantiating the new version of a microservice and retiring the old version once it has drained all the requests in flight.[7][8][9]

## See also

* CI/CD, the combined practices of either (more often) continuous integration and continuous delivery, or (less often) continuous integration and continuous deployment
* Canary release
* Blue–green deployment

## References

1. ↑ Shahin, Mojtaba; Ali Babara, Muhammad; Zhu, Liming (2017). "Continuous Integration, Delivery and Deployment: A Systematic Review on Approaches, Tools, Challenges and Practices". IEEE Access 5: 3909–3943. doi:10.1109/ACCESS.2017.2685629. Bibcode: 2017arXiv170307019S.
2. ↑ Holmstrom Olsson, Helena; Alahyari, Hiva; Bosch, Jan (2012). "Climbing the "Stairway to Heaven" -- A Mulitiple-Case Study Exploring Barriers in the Transition from Agile Development towards Continuous Deployment of Software". 2012 38th Euromicro Conference on Software Engineering and Advanced Applications. IEEE Computer Society. pp. 392–399. doi:10.1109/SEAA.2012.54. ISBN 978-0-7695-4790-9.
3. ↑ Claps, Gerry Gerard; Berntsson Svenssonb, Richard; Aurum, Aybüke (2014). "On the journey to continuous deployment: Technical and social challenges along the way". Information and Software Technology 57: 21–31. doi:10.1016/j.infsof.2014.07.009.
4. ↑ Shahin, Mojtaba; Babar, Muhammad Ali; Zahedi, Mansooreh; Zhu, Liming (2017). "Beyond Continuous Delivery: An Empirical Investigation of Continuous Deployment Challenges". 2017 ACM/IEEE International Symposium on Empirical Software Engineering and Measurement (ESEM). pp. 111–120. doi:10.1109/ESEM.2017.18. ISBN 978-1-5090-4039-1.
5. ↑ "Continuous Deployment: An Essential Guide". IBM. 2019-10-02. https://www.ibm.com/cloud/learn/continuous-deployment. "Continuous deployment is the natural outcome of continuous delivery done well. Eventually, the manual approval delivers little or no value and is merely slowly things down. At that point, it is done away with and continuous delivery becomes continuous deployment."
6. ↑ Rossel, Sander (2017). Continuous Integration, Delivery, and Deployment.
7. ↑ Vera-Rivera, F. H. (2018). "A development process of enterprise applications with microservices" (in en). Journal of Physics: Conference Series 1126 (1): 012017. doi:10.1088/1742-6596/1126/1/012017. ISSN 1742-6596. Bibcode: 2018JPhCS1126a2017V.
8. ↑ Serlet, Bertrand (2019). "Data-centric Software Manifesto" (in en-US). https://www.fungible.com/tech/data-centric-sw-manifesto/.
9. ↑ Butler, Brandon (2016-11-09). "What you should know about microservices" (in en). https://www.computerworld.com/article/3140198/what-you-should-know-about-microservices.html.

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