Short journey into the serverless world
- 2. Short Journey into Serverless World Introduction to Serverless bit.ly/faas-tutorial https://learn.openshift.com/serverless https://github.com/knative/
- 3. I am a Developer ! ● Active Open Source Contributor ○ OpenWhisk ○ Eclipse Che ○ fabric8 Platform https://fabric8.io/ ● Creator vert.x-maven-plugin → https://vmp.fabric8.io/ kameshsampath Kamesh Sampath Director of Developer Experience at Red Hat @kamesh_sampath [email protected] [email protected]
- 4. What is Serverless ? Serverless computing refers to the concept of building and running applications that do not require server management. It describes a finer-grained deployment model where applications, bundled as one or more functions, are uploaded to a platform and then executed, scaled, and billed in response to the exact demand needed at the moment. https://www.cncf.io/blog/2018/02/14/cncf-takes-first-step-towards-serverless-computing
- 6. Good and Bad about Serverless ● Automatic Scalability ● Automatic Cost Reduction ● Quicker and Easier Development ● Better Capacity planning ● Delivery speed ● Debugging ● Deployment and Architectural complexity ● Deep learning curve ● Vendor Lock-in ● Monitoring https://hackernoon.com/serverless-survey-77-delivery-speed-4-dev-workdays-mo-saved-26-aws-monthly-bill-d99174f70663
- 7. Microservices Serverless Functions Your Control Long-Lived Processes Known Programming Model Often Sync Request-Response Mature: IDE Integration Debuggers Tracers Monitoring CI/CD Cloud Control Short-Lived Processes New Programming Model Event-Driven Async Immature: ?
- 8. Business Logic Application Data Containers OS Virtualization Server, Storage, Network Container as a Service Business Logic Application Data Runtime OS Virtualization Server, Storage, Network Infrastructure as a Service Business Logic Application Data Containers OS Virtualization Server, Storage, Network Platform as a Service Business Logic Application Data Containers OS Virtualization Server, Storage, Network Backend as a Service Business Logic Application Data Containers OS Virtualization Server, Storage, Network Function as a Service Platform Responsibilities Business Logic Application Data Runtime OS Virtualization Server, Storage, Network On Premises
- 9. KNative Knative provides a set of middleware components that are essential to build modern, source-centric, and container-based applications that can run anywhere: on premises, in the cloud, or even in a third-party data center. Knative components are built on Kubernetes and codify the best practices shared by successful real-world . ● Essential base primitives for all ● Developer-friendly software ● Supports popular development patterns ● Best of both worlds: Flexibility and control ● Operator-friendly https://cloud.google.com/knative/
- 10. Apache OpenWhisk ● Open Source incubating under Apache ● A Cloud platform to execute functions written in: ○ JavaScript ○ Swift ○ Java ○ Python ○ PHP ○ Docker ○ Go ● Deployable on ○ Any platform where docker can be run ○ Kubernetes/OpenShift
- 11. Some theory ● Actions ○ A stateless code snippet that gets executed ● Package ○ A bundle of actions and feeds synonymous to Java Packages ● Feeds ○ Acts as Interface between external Event Sources and OpenWhisk Actions ● Triggers ○ Stimulus of external Events via Feeds ● Rules ○ Ties one or more Triggers to an Action or vice-versa ● Activation ○ Records the output/response of Running/Ran actions
- 12. Tooling ● wsk ○ The core command line interface to work OpenWhisk ● wskdeploy ○ The command line tool to allow deploying OpenWhisk actions, functions etc., using YAML base manifest ● Maven (only for Java) ○ Generate OpenWhisk Java Functions ● Serverless Framework ○ JavaScript based template framework ○ Support for generating OpenWhisk Templated project ○ Ability to deploy functions to OpenWhisk
- 14. Apache OpenWhisk - How does it work ? Controller Kafka nginx Invoker Invoker
- 15. Get the feel
- 16. Action Chaining ● Actions can be chained ● Pre-defined chain of actions ○ Sequences ● Action Chaining could also be determined at runtime ○ Conductors ● Only first function in Sequence can accept parameter ○ The output of previous step(Action) is input to next
- 17. Demo - Action Chaining
- 18. Event Driven Capabilities ● OpenWhisk functions can respond to Events ● Events could be ○ Another function ○ External event source called as Feed Provider ● Event Action is OpenWhisk Function that’s invoked for a Trigger ● Event Actions are invoked via Triggers ○ Rules tie Actions to Triggers ● Trigger can be registered to Event Provider via Feeds (Stream of Events) ○ Feed can be: ■ Polling ■ Webhook ■ Persistent Connection
- 19. Cloud Events ● Define specification for Cloud Events ○ Effort via CNCF’s Serverless Working Group ● Major Cloud Providers, SaaS providers are part of working committee ● https://cloudevents.io/
- 20. Feed the Trigger to Rule your Action
- 21. Demo - Feeds and Events