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Image Stream

Image stream is an abstraction to container image in image registry. Image stream itself does not container any image it just a referece to actual image.

You can configure builds and deployments to watch an image stream for notifications when new images are added and react by performing a build or deployment, respectively.

Automatic trigger deployment

  • import image with schedule update ( Default is every 15 minutes)

    oc import-image backend  --scheduled --confirm --all --from quay.io/voravitl/backend
oc get istag

  • Setup image lookup for backend imagestream

    oc set image-lookup backend
oc set image-lookup --list

  • With image lookup is enabled. Imagestream name can be used in deployment

        spec:
      containers:
      - name: backend
        image: backend:v1

  • Check for latest update interval imagestream

    oc get istag backend:v1

    Output

    NAME         IMAGE REFERENCE                                                                                    UPDATED
backend:v1   quay.io/voravitl/backend@sha256:19ef0afb88a1ce5d6a4422c7ab8395eb05b672fc27d5d387d9fcd8e15a44c5d7   30 seconds ago

  • Deploy application

    oc apply -f backend.yaml

  • Set trigger

    oc set triggers deployment/backend --from-image backend:v1 -c backend

    Trigger will set following annotation to deployment for container name backend

    metadata:
  name: backend
  annotations:
    image.openshift.io/triggers: '[{"from":{"kind":"ImageStreamTag","name":"backend:v1"},"fieldPath":"spec.template.spec.containers[?(@.name==\"backend\")].image"}]'

  • When image on image registry