Serverless on OpenShift - Developer Experience Office Hours

What new in OpenShift 4.7 with Serverless
Release notes: https://docs.openshift.com/container-platform/4.7/serverless/serverless-release-notes.html

What’s in pipeline for OpenShift upcoming release

Transcript

1. OpenShift Developer Experience Office Hours
   March 2, 2021
   Serverless on
   OpenShift
   

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2. CONFIDENTIAL Designator
   What’s we are going to talk about?
   2
   What new in OpenShift 4.7 with Serverless
   What’s in pipeline for OpenShift upcoming release
   

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3. CONFIDENTIAL Designator
   Serverless
   3
   “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”
   -- CNCF Definition, https://www.cncf.io/blog/2018/02/14/cncf-takes-first-step-towards-serverless-computing/
   Serverless
   

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4. Kubernetes-based platform to
   deploy and manage modern
   serverless workloads.
   Knative
   4
   https://knative.dev
   

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5. 5
   Serving
   A request-driven model
   that serves the container
   with your application and
   can "scale to zero".
   Eventing
   Common infrastructure for
   consuming and producing
   events that will stimulate
   applications.
   Knative
   Serverless Components
   

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6. New features added in 4.7
   Serverless
   6
   ● Ability to list/create serving and eventing resources from Admin
   Perspective
   

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7. New features added in 4.7
   Serverless
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   ● Event Source Catalog: EventSources are part of catalog now to
   improve scalability for better user experience
   ● Camel Connector: Added support for kamelets (Camel Connector)
   as part of EventSource catalog
   

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8. New features added in 4.7
   Serverless
   8
   ● Event Sources Catalog
   

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9. New features added in 4.7
   Serverless
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   ● Channels and Subscriptions
   

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10. Source → Service : Channel & Subscription
    Serverless
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    ● Multiple Services can consume the same event
    ● Subscription can point to a reply channel (not shown here)
    ● Various Channel Backends available
    ○ In-Memory, Kafka, GCP PubSub, (write your own)
    ● Drawbacks:
    ○ No filtering, Service gets always all events
    Source Sink
    Sink
    Subscription
    Subscription
    Source
    Channel
    

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11. New features added in 4.7
    Serverless
    11
    ● Brokers and Triggers
    

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12. 12
    Serverless
    Source → Service: Broker & Trigger
    Broker
    ● Eventing Mesh for distributing Events
    ● Addressed by sources as sink
    Broker
    Source
    Source
    Sink
    Sink
    Trigger
    filter =
    Trigger
    filter =
    Trigger
    ● Filter on CloudEvent attributes (e.g. type)
    ● Connects a Sink with Broker
    

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13. Upcoming features
    Serverless
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    ● Visualize Serverless functions
    

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14. Upcoming features
    Serverless
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    ● Advance Scaling options for knative Service
    

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15. Upcoming features
    Serverless
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    ● Migrate existing workloads to serverless (knative service) with a click
    

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16. From Deployment to KService
    Serverless
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    apiVersion: apps/v1
    kind: Deployment
    metadata:
    name: random
    spec:
    replicas: 1
    selector:
    matchLabels:
    app: random
    template:
    metadata:
    labels:
    app: random
    spec:
    containers:
    - image: rhuss/random
    name: random
    ports:
    - containerPort: 8080
    apiVersion: serving.knative.dev/v1
    kind: Service
    metadata:
    name: random
    spec:
    replicas: 1
    selector:
    matchLabels:
    app: random
    template:
    metadata:
    labels:
    app: random
    spec:
    containers:
    - image: rhuss/random
    name: random
    ports:
    - containerPort: 8080
    No more K8s
    Service or
    Ingress/Route
    required !
    

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17. Demo
    Serverless
    17
    

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18. 18 http://dn.dev/knative-cookbook
    

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19. https://k8spatterns.io
    https://twitter.com/ro14nd
    https://twitter.com/k8spatterns
    https://twitter.com/mwessendorf
    Thank you
    19
    

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