davgordo / gitops-cluster-bvwfc

Example GitOps-managed Service Mesh

Use this repository as a starting point to manage a Service Mesh on an OpenShift cluster.

Getting Started

1. Clone this example repository.

2. Configure the example ArgoCD Application by providing your new repository URL spec.source.repoURL in the following files:

   bootstrap/instance/application.yaml
   apps/application-service-mesh.yaml
   

3. Provision the ArgoCD operator:

   oc apply -k bootstrap/operator
   

4. Provision the ArgoCD Application:

   oc apply -k bootstrap/instance
   

Observation

The demo bootstrap initiates a default ArgoCD instance hosted in the openshift-gitops namespace. In this namespace a Route is deployed which provides a URL to the ArgoCD console.

Onboarding an application to the Service Mesh

The following sections will describe how to manage applications deployed to the Service Mesh with this GitOps framework.

Requesting new namepaces

New namespaces are added by including their definitions in servicemesh/overlays/default/namespaces.yaml. The namespaces bookinfo-test and bookinfo-qa are commented out there.

Adding namespaces to a ServiceMeshMemberRoll

If you want new namespaces to be included as a member of the mesh. Add them to servicemesh/overlays/default/servicemeshmemberroll.yaml

Adding ArgoCD Applications (bookinfo example)

You can define applications in the apps directory. Example application definitions are available for the sample bookinfo namespaces. Uncomment the lines in apps/kustomization.yaml to deploy those apps.

Validating the bookinfo example

Use Kiali to visualize bookinfo traffic:

KIALI_URL=$(oc get route kiali -n istio-system -o jsonpath='{.spec.host}')

Or using openshift console: Networking->Routes->kiali

Open the URL on a browser and then click on the bookinfo-test app:

Make sure all services are healthy:

Call the productinfo page: export the ingress gateway URL into an env variable, use curl to invoke it:

BOOK_GW=$(oc get route istio-ingressgateway -n istio-system -o jsonpath="{.spec.host}{.spec.path}")

curl -v $BOOK_GW/productpage | grep '<title>Simple Bookstore App</title>'

Setup Kiali for traffic visualization by going to the left menu Graph then click on the drop down Display and select Request Rate, Request Distribution, Namespace Boxes, Traffic Animation options:

Use a simple script below to call the productpage every 10s:

while true; \
do curl -v $BOOK_GW/productpage | grep '<title>Simple Bookstore App</title>'; \
sleep 10;done

Enter Control-C to stop the script.

Switch to the graph and watch the animation, observe the statistics chosen in the graph selection:

Select the reviews service by clicking on the node and observe on the right the incoming traffic:

If you want to inspect traffic metrics even further, go to the left menu named Services and select the reviews service, then click on the Inbound Metrics tab:

In the same Kiali service view you have the ability to see more in detail metrics by jumping to Grafana, click on the blue link that reads View in Grafana and expect something like this: