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Deploying Applications to Multiple Clusters

Sending an Application to the Dev Clusters

In this use case we are going to deploy a sample application prometheus-example-app to our development clusters, that means that we're going to target clusters labeled as env: dev.

NOTE: Below commands should be run in HUB Cluster (where ACM is running)

  1. Create the different ACM components we will be using in this example: Channel, PlacementRule, Application and Subscription:

    oc create -f https://raw.githubusercontent.com/lcolagio/lab-rhacm/master/usecase1/rhacm/channel.yaml
oc create -f https://raw.githubusercontent.com/lcolagio/lab-rhacm/master/usecase1/rhacm/application.yaml
oc create -f https://raw.githubusercontent.com/lcolagio/lab-rhacm/master/usecase1/rhacm/subscription.yaml
oc create -f https://raw.githubusercontent.com/lcolagio/lab-rhacm/master/usecase1/rhacm/placementrule.yaml

  2. Check ACM components:

    created project

    oc get project | grep usecase1

    created ACM Components

    oc get applications -A | grep usecase1
oc get channel -A | grep usecase1
oc get subscription -A | grep usecase1
oc get placementrule -A | grep usecase1

oc describe subscription usecase1-subscription1 -n usecase1-app
    oc get deployable -A | grep usecase1

    output:

    ocp3                      usecase1-subscription1-deployable-mbb6s                                         Subscription    apps.open-cluster-management.io/v1   83s    Deployed
ocp4                      usecase1-subscription1-deployable-7xbqw                                         Subscription    apps.open-cluster-management.io/v1   83s    Deployed
usecase1-app              usecase1-subscription1-deployable                                               Subscription    apps.open-cluster-management.io/v1   83s    Propagated
usecase1-app              usecase1-subscription1-usecase1-application-prometheus-example-app-deployment   Deployment      apps/v1                              83s
usecase1-app              usecase1-subscription1-usecase1-application-usecase1-ns-namespace               Namespace       v1                                   83s

  3. How to edit an component ACM

    # Edit subscription
oc edit subscription usecase1-subscription1 -n usecase1-app
    # Edit Placementrule to change cluster label selector from dev to qua by example
oc edit placementrule usecase1-placementrule -n usecase1-app

  4. How to Delete all created components for the sample application

    # on cluster Hub
oc delete subscription usecase1-subscription1 -n usecase1-app
oc delete placementrule usecase1-placementrule -n usecase1-app
oc delete applications usecase1-app -n usecase1-app
oc delete channel usecase1-channel -n usecase1-channel

oc delete project usecase1-channel
oc delete project usecase1-app

# on managed cluster
oc delete project usecase1-app