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Serverless Architectures with Kubernetes

You're reading from   Serverless Architectures with Kubernetes Create production-ready Kubernetes clusters and run serverless applications on them

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Product type Paperback
Published in Nov 2019
Publisher
ISBN-13 9781838983277
Length 474 pages
Edition 1st Edition
Concepts
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Authors (2):
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Onur Yılmaz Onur Yılmaz
Author Profile Icon Onur Yılmaz
Onur Yılmaz
Sathsara Sarathchandra Sathsara Sarathchandra
Author Profile Icon Sathsara Sarathchandra
Sathsara Sarathchandra
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Toc

Table of Contents (11) Chapters Close

Preface 1. Introduction to Serverless FREE CHAPTER 2. Introduction to Serverless in the Cloud 3. Introduction to Serverless Frameworks 4. Kubernetes Deep Dive 5. Production-Ready Kubernetes Clusters 6. Upcoming Serverless Features in Kubernetes 7. Kubernetes Serverless with Kubeless 8. Introduction to Apache OpenWhisk 9. Going Serverless with OpenFaaS Appendix

OpenWhisk Feeds, Triggers, and Rules

In the previous sections, we learned how to invoke actions either with the wsk CLI or with HTTP requests using web actions. In this section, we are going to learn how to automate action invocation with OpenWhisk feeds, triggers, and rules. The following diagram illustrates how actions are invoked with events from external event sources using feeds, triggers, and rules:

Figure 8.53: OpenWhisk Feeds, triggers, and rules

Triggers are different types of events sent from event sources. These triggers can be fired either manually with the wsk CLI or automatically from events occurring in external event sources. Some examples of an event source are a Git repository, an email account, or a Slack channel. As illustrated in the preceding diagram, feeds are used to connect the triggers to external event sources. Examples for feeds are as follows:

  • A commit is made to a Git repository.
  • Incoming email messages to a particular...
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