From dd7149e805cbac449be72052f3ec37540b0f2186 Mon Sep 17 00:00:00 2001 From: Katherine Jackson Date: Mon, 26 Aug 2019 14:09:18 -0500 Subject: [PATCH] Removed a bad html file (#1736) --- docs/eventing/getting-started.html | 1526 ---------------------------- 1 file changed, 1526 deletions(-) delete mode 100644 docs/eventing/getting-started.html diff --git a/docs/eventing/getting-started.html b/docs/eventing/getting-started.html deleted file mode 100644 index 7953c6dee..000000000 --- a/docs/eventing/getting-started.html +++ /dev/null @@ -1,1526 +0,0 @@ - - -"Getting Started with Eventing"

Use this guide to learn how to create, send, and verify events in Knative. The steps in this guide demonstrate a basic developer flow for managing events in Knative, including:

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    -
  1. Installing the Knative Eventing component
    2. -
  2. Creating and configuring Knative Eventing Resources
    3. -
  3. Sending events with HTTP requests
    4. -
  4. Verifying events were sent correctly
    5. -
-

Before you begin

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To complete this guide, you will need the following installed and running:

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Installing Knative Eventing

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If you previously created a Knative cluster, you might already have Knative Eventing installed and running. You can check to see if the Eventing component exists on your cluster by running:

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kubectl get pods --namespace knative-eventing
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- -

If the knative-eventing namespace or the in-memory-channel-controller-* does not exist, use the following steps to install Knative Eventing with the in-memory channel provisioner:

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    -
  1. Make sure that you have a functioning Kubernetes cluster. See the Comprehensive Install guide for more information.
    2. -
  2. -

    Install the Eventing CRDs by running the following command:

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    kubectl apply --selector knative.dev/crd-install=true \
---filename https://github.com/knative/eventing/releases/download/{{< version >}}/release.yaml
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    - -
    3. -
  3. -

    Install the Eventing sources by running the following command:

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    kubectl apply --filename https://github.com/knative/eventing/releases/download/{{< version >}}/release.yaml
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    - -
    4. -
  4. -

    Confirm that Knative Eventing is correctly installed by running the following command:

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    kubectl get pods --namespace knative-eventing
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    -This will return the following result:

    -

    sh -NAME READY STATUS RESTARTS AGE -eventing-controller-6cdf6ff785-44k98 1/1 Running 0 29m -eventing-webhook-6c4f6699d8-qclbx 1/1 Running 0 29m -imc-controller-85cdb4946b-h2msj 1/1 Running 0 13m -imc-dispatcher-5f4689d868-fspt6 1/1 Running 0 13m -in-memory-channel-controller-d9db9d879-f2jw6 1/1 Running 0 13m -in-memory-channel-dispatcher-79bc7f46cd-4mvj6 1/1 Running 0 13m -sources-controller-5847564f4f-z59xc 1/1 Running 0 29m

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    5. -
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Setting up Knative Eventing Resources

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Before you start to manage events, you need to create the objects needed to transport the events.

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Creating and configuring an Eventing namespace

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In this section you create the event-example namespace and then add the knative-eventing-injection label to that namespace. You use namespaces to group together and organize your Knative resources, including the Eventing subcomponents.

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    -
  1. -

    Run the following command to create a namespace called event-example:

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    kubectl create namespace event-example
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    - -

    This creates an empty namespace called event-example.

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    2. -
  2. -

    Add a label to your namespace with the following command:

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    kubectl label namespace event-example knative-eventing-injection=enabled
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    - -
    3. -
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This gives the event-example namespace the knative-eventing-injection label, which adds resources that will allow you to manage your events.

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In the next section, you will need to verify that the resources you added in this section are running correctly. Then, you can create the rest of the eventing resources you need to manage events.

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Validating that the Broker is running

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The [Broker] ensures that every event sent by event producers arrives at the correct event consumers. The Broker was created when you labeled your namespace as ready for eventing, but it is important to verify that your Broker is working correctly. In this guide, you will use the default broker.

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    -
  1. -

    Run the following command to verify that the Broker is in a healthy state:

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    kubectl --namespace event-example get Broker default
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    - -
    2. -
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This shows the Broker that you created:

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```sh
-NAME      READY   REASON   HOSTNAME                                                           AGE
-default   True             default-Broker.event-example.svc.cluster.local   1m
-```
-
-When the `Broker` has the `READY=True` state, it can begin to manage any events it receives.
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- - -
    -
  1. If READY=False, wait 2 minutes and re-run the command. If you continue to receive the READY=False, see the Debugging Guide to help troubleshoot the issue.
    2. -
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Now that your Broker is ready to manage events, you can create and configure your event producers and consumers.

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Creating event consumers

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Your event consumers receive the events sent by event producers. In this step, you will create two event consumers, hello-display and goodbye-display, to demonstrate how you can configure your event producers to selectively target a specific consumer.

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  1. -

    To deploy the hello-display consumer to your cluster, run the following command:

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    kubectl --namespace event-example apply --filename - << END
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: hello-display
-spec:
-  replicas: 1
-  selector:
-    matchLabels: &labels
-      app: hello-display
-  template:
-    metadata:
-      labels: *labels
-    spec:
-      containers:
-        - name: event-display
-          # Source code: https://github.com/knative/eventing-contrib/blob/release-0.6/cmd/event_display/main.go
-          image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display@sha256:37ace92b63fc516ad4c8331b6b3b2d84e4ab2d8ba898e387c0b6f68f0e3081c4
-
----
-
-# Service pointing at the previous Deployment. This will be the target for event
-# consumption.
-kind: Service
-apiVersion: v1
-metadata:
-  name: hello-display
-spec:
-  selector:
-    app: hello-display
-  ports:
-  - protocol: TCP
-    port: 80
-    targetPort: 8080
-END
-
    - -
    2. -
  2. -

    To deploy the goodbye-display consumer to your cluster, run the following command:

    -
    kubectl --namespace event-example apply --filename - << END
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: goodbye-display
-spec:
-  replicas: 1
-  selector:
-    matchLabels: &labels
-      app: goodbye-display
-  template:
-    metadata:
-      labels: *labels
-    spec:
-      containers:
-        - name: event-display
-          # Source code: https://github.com/knative/eventing-contrib/blob/release-0.6/cmd/event_display/main.go
-          image: gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display@sha256:37ace92b63fc516ad4c8331b6b3b2d84e4ab2d8ba898e387c0b6f68f0e3081c4
-
----
-
-# Service pointing at the previous Deployment. This will be the target for event
-# consumption.
-kind: Service
-apiVersion: v1
-metadata:
-  name: goodbye-display
-spec:
-  selector:
-    app: goodbye-display
-  ports:
-  - protocol: TCP
-    port: 80
-    targetPort: 8080
-END
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    - -
    3. -
  3. -

    Just like you did with the Broker, verify that your event consumers are working by running the following command:

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    kubectl --namespace event-example get deployments hello-display goodbye-display
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    - -

    This lists the hello-display and goodbye-display consumers that you deployed:

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    sh -NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE -hello-display 1 1 1 1 26s -NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE -goodbye-display 1 1 1 1 16s

    -

    The number of replicas in your DESIRED column should match the number of replicas in your AVAILABLE column, which might take a few minutes. If after two minutes the numbers do not match, then see the Debugging Guide to help troubleshoot the issue.

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    4. -
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Creating Triggers

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A [Trigger]vdefines the events that you want each of your event consumers -to receive. Your Broker uses triggers to forward events to the right consumers. Each trigger can specify a filter to select relevant events based on the Cloud Event context attributes.

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    -
  1. -

    To create the first Trigger, run the following command:

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    kubectl --namespace event-example apply --filename - << END
-apiVersion: eventing.knative.dev/v1alpha1
-kind: Trigger
-metadata:
-  name: hello-display
-spec:
-  filter:
-    attributes:
-      type: greeting
-  subscriber:
-    ref:
-     apiVersion: v1
-     kind: Service
-     name: hello-display
-END
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    - -
    2. -
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The command creates a trigger that sends all events of type greeting to your event consumer named hello-display.

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    -
  1. -

    To add the second Trigger, run the following command:

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    kubectl --namespace event-example apply --filename - << END
-apiVersion: eventing.knative.dev/v1alpha1
-kind: Trigger
-metadata:
-  name: goodbye-display
-spec:
-  filter:
-    attributes:
-      source: sendoff
-  subscriber:
-    ref:
-     apiVersion: v1
-     kind: Service
-     name: goodbye-display
-END
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    - -
    2. -
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The command creates a trigger that sends all events of source sendoff to your event consumer named goodbye-display.

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  1. -

    Verify that the triggers are working correctly by running the following command:

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    kubectl --namespace event-example get triggers
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    This returns the hello-display and goodbye-display triggers that you created:

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    NAME                   READY   REASON   BROKER    SUBSCRIBER_URI                                                                 AGE
-goodbye-display        True             default   http://goodbye-display.event-example.svc.cluster.local/                        9s
-hello-display          True             default   http://hello-display.event-example.svc.cluster.local/                          16s
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    - -

    If the triggers are correctly configured, they will be ready and pointing to the correct Broker (the default broker) and SUBSCRIBER_URI (triggerName.namespaceName.svc.cluster.local). If this is not the case, see the Debugging Guide to help troubleshoot the issue.

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    2. -
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You have now created all of the resources needed to receive and manage events. You created the Broker, which manages the events sent to event consumers with the help of triggers. In the next section, you will make the event producer that will be used to create your events.

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Creating event producers

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In this section you will create an event producer that you can use to interact with the Knative Eventing subcomponents you created earlier. Most events are created systematically, but this guide uses curl to manually send individual events and demonstrate how these events are received by the correct event consumer. Because you can only access the Broker from within your Eventing cluster, you must create a Pod within that cluster to act as your event producer.

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In the following step, you will create a Pod that executes your curl commands to send events to the Broker in your Eventing cluster.

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To create the Pod, run the following command:

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kubectl --namespace event-example apply --filename - << END
-apiVersion: v1
-kind: Pod
-metadata:
-  labels:
-    run: curl
-  name: curl
-spec:
-  containers:
-    # This could be any image that we can SSH into and has curl.
-  - image: radial/busyboxplus:curl
-    imagePullPolicy: IfNotPresent
-    name: curl
-    resources: {}
-    stdin: true
-    terminationMessagePath: /dev/termination-log
-    terminationMessagePolicy: File
-    tty: true
-END
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Now that you’ve set up your Eventing cluster to send and consume events, you will use HTTP requests to manually send separate events and demonstrate how each of those events can target your individual event consumers in the next section.

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Sending Events to the Broker

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Now that you’ve created the Pod, you can create an event by sending an HTTP request to the Broker. SSH into the Pod by running the following command:

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  kubectl --namespace event-example attach curl -it
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You have sshed into the Pod, and can now make a HTTP request. A prompt similar to the one below will appear:

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    Defaulting container name to curl.
-    Use 'kubectl describe pod/ -n event-example' to see all of the containers in this pod.
-    If you don't see a command prompt, try pressing enter.
-    [ root@curl:/ ]$
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To show the various types of events you can send, you will make three requests:

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    -
  1. -

    To make the first request, which creates an event that has the type greeting, run the following in the SSH terminal:

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    curl -v "default-broker.event-example.svc.cluster.local" \
-  -X POST \
-  -H "Ce-Id: say-hello" \
-  -H "Ce-Specversion: 0.2" \
-  -H "Ce-Type: greeting" \
-  -H "Ce-Source: not-sendoff" \
-  -H "Content-Type: application/json" \
-  -d '{"msg":"Hello Knative!"}'
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    - -

    When the Broker receives your event, hello-display will activate and send it to the event consumer of the same name.

    -

    If the event has been received, you will receive a 202 Accepted response similar to the one below:

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    < HTTP/1.1 202 Accepted
-< Content-Length: 0
-< Date: Mon, 12 Aug 2019 19:48:18 GMT
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    - -
    2. -
  2. -

    To make the second request, which creates an event that has the source sendoff, run the following in the SSH terminal:

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    curl -v "default-broker.event-example.svc.cluster.local" \
-  -X POST \
-  -H "Ce-Id: say-goodbye" \
-  -H "Ce-Specversion: 0.2" \
-  -H "Ce-Type: not-greeting" \
-  -H "Ce-Source: sendoff" \
-  -H "Content-Type: application/json" \
-  -d '{"msg":"Goodbye Knative!"}'
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    - -
    3. -
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When the Broker receives your event, goodbye-display will activate and send the event to the event consumer of the same name.

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If the event has been received, you will receive a 202 Accepted response similar to the one below:

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```sh
-< HTTP/1.1 202 Accepted
-< Content-Length: 0
-< Date: Mon, 12 Aug 2019 19:48:18 GMT
-```
-
- - -
    -
  1. -

    To make the third request, which creates an event that has the type greeting and thesource sendoff, run the following in the SSH terminal:

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    sh -curl -v "default-broker.event-example.svc.cluster.local" \ - -X POST \ - -H "Ce-Id: say-hello-goodbye" \ - -H "Ce-Specversion: 0.2" \ - -H "Ce-Type: greeting" \ - -H "Ce-Source: sendoff" \ - -H "Content-Type: application/json" \ - -d '{"msg":"Hello Knative! Goodbye Knative!"}'

    -
    2. -
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When the Broker receives your event, hello-display and goodbye-display will activate and send the event to the event consumer of the same name.

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If the event has been received, you will receive a 202 Accepted response similar to the one below:

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```sh
-< HTTP/1.1 202 Accepted
-< Content-Length: 0
-< Date: Mon, 12 Aug 2019 19:48:18 GMT
-```
-
- - -
    -
  1. Exit SSH by typing exit into the command prompt.
    2. -
-

You have sent two events to the hello-display event consumer and two events to the goodbye-display event consumer (note that say-hello-goodbye activates the trigger conditions for both hello-display and goodbye-display). You will verify that these events were received correctly in the next section.

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Verifying events were received

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After sending events, verify that your events were received by the appropriate Subscribers.

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    -
  1. -

    Look at the logs for the hello-display event consumer by running the following command:

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    kubectl --namespace event-example logs -l app=hello-display --tail=100
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    - -

    This returns the Attributes and Data of the events you sent to hello-display:

    -
    ☁️  cloudevents.Event
-Validation: valid
-Context Attributes,
-  specversion: 0.2
-  type: greeting
-  source: not-sendoff
-  id: say-hello
-  time: 2019-05-20T17:59:43.81718488Z
-  contenttype: application/json
-Extensions,
-  knativehistory: default-broker-srk54-channel-24gls.event-example.svc.cluster.local
-Data,
-  {
-    "msg": "Hello Knative!"
-  }
-☁️  cloudevents.Event
-Validation: valid
-Context Attributes,
-  specversion: 0.2
-  type: greeting
-  source: sendoff
-  id: say-hello-goodbye
-  time: 2019-05-20T17:59:54.211866425Z
-  contenttype: application/json
-Extensions,
-  knativehistory: default-broker-srk54-channel-24gls.event-example.svc.cluster.local
-Data,
- {
-   "msg": "Hello Knative! Goodbye Knative!"
- }
-
    - -
    2. -
  2. -

    Look at the logs for the goodbye-display event consumer by running the following command:

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    kubectl --namespace event-example logs -l app=goodbye-display --tail=100
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    - -

    This returns the Attributes and Data of the events you sent to goodbye-display:

    -

    sh -☁️ cloudevents.Event -Validation: valid -Context Attributes, - specversion: 0.2 - type: not-greeting - source: sendoff - id: say-goodbye - time: 2019-05-20T17:59:49.044926148Z - contenttype: application/json - Extensions, - knativehistory: default-broker-srk54-channel-24gls.event-example.svc.cluster.local -Data, - { - "msg": "Goodbye Knative!" - } - ☁️ cloudevents.Event - Validation: valid - Context Attributes, - specversion: 0.2 - type: greeting - source: sendoff - id: say-hello-goodbye - time: 2019-05-20T17:59:54.211866425Z - contenttype: application/json - Extensions, - knativehistory: default-broker-srk54-channel-24gls.event-example.svc.cluster.local - Data, - { - "msg": "Hello Knative! Goodbye Knative!" - }

    -
    3. -
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Cleaning up

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After you finish this guide, delete your namespace to conserve resources if you do not plan to use them.

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Note: If you plan to continue learning about Knative Eventing with one of our code samples, check the requirements of the sample and make sure you do not need a namespace before you delete event-example. You can always reuse your namespaces.

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Run the following command to delete event-example:

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kubectl delete namespace event-example
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- -

This removes the namespace and all of its resources from your cluster.

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What’s next

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You’ve learned the basics of the Knative Eventing workflow. Here are some additional resources to help you continue to build with the Knative Eventing component.

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