GitOps with Red Hat ACM
You should have three OCP managed cluster and one OCP hub cluster
# Login into hub cluster
oc login -u admin -p XXXX --insecure-skip-tls-verify https://api.YOURACMCLUSTER.DOMAIN:6443
# Set the name of the context
oc config rename-context $(oc config current-context) hubcluster
# Login into 1st cluster (A environment)
oc login -u admin -p XXXX --insecure-skip-tls-verify https://api.YOURCLUSTER1.DOMAIN:6443
# Set the name of the context
oc config rename-context $(oc config current-context) cluster1
# Login into 2nd cluster (B environment)
oc login -u admin -p XXXX --insecure-skip-tls-verify https://api.YOURCLUSTER2.DOMAIN:6443
# Set the name of the context
oc config rename-context $(oc config current-context) cluster2
# Login into 3rd cluster (C environment)
oc login -u admin -p XXXX --insecure-skip-tls-verify https://api.YOURCLUSTER3.DOMAIN:6443
# Set the name of the context
oc config rename-context $(oc config current-context) cluster3This lab will use cluster1, cluster2 and cluster3. The first step is to ensure that no resources currently exist in the simple-app namespace.
# Use the `oc` command to list deployments
oc --context cluster1 -n simple-app get deployment
No resources found.The simple application we are using is an Apache web server serving a default index page.
The simple application includes the following resources:
- A Namespace for the deployment and service.
- A Deployment of Apache web server.
- A Service.
The assets contains definitions to deploy these resources. For example: the simple Apache deployment template
1- Change the directory acm
cd acm2- Ensure to load the "hubcluster" context
oc config use-context hubcluster3- Create namespace
oc create -f 01_namespace.yaml4- Create channel
oc create -f 02_channel.yaml5- Create application
oc create -f 03_application.yaml6- Create placementrule for putting application just on Openshift cluster1
oc create -f 04_placement_cluster1.yaml
oc create -f 04_placement_cluster2.yaml
oc create -f 04_placement_cluster3.yaml7- Create subscription
oc create -f 05_subscription_cluster1.yaml
oc create -f 05_subscription_cluster2.yaml
oc create -f 05_subscription_cluster3.yamlVerify that the various resources have been deployed.
# The command below will display objects in the simple-app namespace
oc --context cluster1 -n simple-app get deployments,services,podsExpose a route to allow for external ingress and verify the application can be queried.
# Expose the route for the httpd service
oc --context=cluster1 -n simple-app expose service httpd
# Get the Route hostname
url="http://$(oc --context=cluster1 -n simple-app get route httpd -o jsonpath='{.spec.host}')"
# We will wait 5 seconds to allow for proper propagation
sleep 5
# Access the route
curl -s $url | grep "This page"We are going to delete the deployment and watch RHACM will notice that the status is unhealthy and redeploy the deployment.
# Use the `oc` command to delete the httpd deployment object
oc --context cluster1 -n simple-app delete deployment httpdAs you can see the deployment is missing.
# Use the `oc` command to list deployments in the simple-app namespace
oc --context cluster1 -n simple-app get deploymentsThe deployment is missing so let's check to ensure RHACM deploying
# Use this `oc` command to check application status
oc describe deployable -n simple-app httpd-deployable
......
.....
Statuses:
/:
Packages:
Federation - Deployment - Httpd:
Last Update Time: 2020-06-03T08:18:48Z
Phase: Subscribed
Resource Status:
Available Replicas: 1
Conditions:
Last Transition Time: 2020-06-03T08:17:15Z
Last Update Time: 2020-06-03T08:17:15Z
Message: Deployment has minimum availability.
Reason: MinimumReplicasAvailable
Status: True
Type: Available
Last Transition Time: 2020-06-03T08:16:39Z
Last Update Time: 2020-06-03T08:17:15Z
Message: ReplicaSet "httpd-54b9dfb679" has successfully progressed.
Reason: NewReplicaSetAvailable
Status: True
Type: Progressing
Observed Generation: 1
Ready Replicas: 1
Replicas: 1
Updated Replicas: 1
Verify the deployment is once again present after the synchronization.
Please note: you may have to wait few seconds before the resources are correctly re-created.
# Use the `oc` command to list deployments in the simple-app namespace
oc --context cluster1 -n simple-app get deploymentsConnecting to RHACM WebUI you should see a topology like this:
