第3章 Configuring the Cluster Observability Operator to monitor a service

Procedure

1. Create a YAML file named prometheus-coo-example-app.yaml that contains the following configuration details for a namespace, deployment, and service:

   apiVersion: v1
   kind: Namespace
   metadata:
     name: ns1-coo
   ---
   apiVersion: apps/v1
   kind: Deployment
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns1-coo
   spec:
     replicas: 1
     selector:
       matchLabels:
         app: prometheus-coo-example-app
     template:
       metadata:
         labels:
           app: prometheus-coo-example-app
       spec:
         containers:
         - image: ghcr.io/rhobs/prometheus-example-app:0.4.2
           imagePullPolicy: IfNotPresent
           name: prometheus-coo-example-app
   ---
   apiVersion: v1
   kind: Service
   metadata:
     labels:
       app: prometheus-coo-example-app
     name: prometheus-coo-example-app
     namespace: ns1-coo
   spec:
     ports:
     - port: 8080
       protocol: TCP
       targetPort: 8080
       name: web
     selector:
       app: prometheus-coo-example-app
     type: ClusterIP

2. Save the file.

3. Apply the configuration to the cluster by running the following command:

   $ oc apply -f prometheus-coo-example-app.yaml

4. Verify that the pod is running by running the following command and observing the output:

   $ oc -n ns1-coo get pod

   Example output

   NAME                                      READY     STATUS    RESTARTS   AGE
   prometheus-coo-example-app-0927545cb7-anskj   1/1       Running   0          81m