c) Monitoring an Oracle Unified Directory Instance

  1. Introduction
  2. Install Prometheus and Grafana
    1. Create a Kubernetes namespace
    2. Add Prometheus and Grafana Helm repositories
    3. Install the Prometheus operator
    4. View Prometheus and Grafana objects created
    5. Add the NodePort
  3. Verify using Grafana GUI

Introduction

After the Oracle Unified Directory instance (OUD) is set up you can monitor it using Prometheus and Grafana.

Install Prometheus and Grafana

Create a Kubernetes namespace

  1. Create a Kubernetes namespace to provide a scope for Prometheus and Grafana objects such as pods and services that you create in the environment. To create your namespace issue the following command:

    $ kubectl create namespace <namespace>
    

    For example:

    $ kubectl create namespace monitoring
    

    The output will look similar to the following:

    namespace/monitoring created
    

Add Prometheus and Grafana Helm repositories

  1. Add the Prometheus and Grafana Helm repositories by issuing the following command:

    $ helm repo add prometheus https://prometheus-community.github.io/helm-charts
    

    The output will look similar to the following:

    "prometheus" has been added to your repositories
    
  2. Run the following command to update the repositories:

    $ helm repo update
    

    The output will look similar to the following:

    Hang tight while we grab the latest from your chart repositories...
    ...Successfully got an update from the "stable" chart repository
    ...Successfully got an update from the "prometheus" chart repository
    ...Successfully got an update from the "prometheus-community" chart repository
    
    Update Complete.  Happy Helming!
    

Install the Prometheus operator

  1. Install the Prometheus operator using the helm command:

    $ helm install <release_name> prometheus/kube-prometheus-stack -n <namespace>
    

    For example:

    $ helm install monitoring prometheus/kube-prometheus-stack -n monitoring
    

    The output should look similar to the following:

    NAME: monitoring
    LAST DEPLOYED: Fri Mar 18 09:57:54 2022
    NAMESPACE: monitoring
    STATUS: deployed
    REVISION: 1
    NOTES:
    kube-prometheus-stack has been installed. Check its status by running:
      kubectl --namespace monitoring get pods -l "release=monitoring"
    
    Visit https://github.com/prometheus-operator/kube-prometheus for instructions on how to create & configure Alertmanager and Prometheus instances using the Operator.
    

View Prometheus and Grafana Objects created

View the objects created for Prometheus and Grafana by issuing the following command:

$ kubectl get all,service,pod -o wide -n <namespace>

For example:

$ kubectl get all,service,pod -o wide -n monitoring

The output will look similar to the following:

NAME                                                         READY   STATUS    RESTARTS   AGE   IP               NODE                 NOMINATED NODE   READINESS GATES
pod/alertmanager-monitoring-kube-prometheus-alertmanager-0   2/2     Running   0          36s   10.244.1.78      <worker-node>   <none>           <none>
pod/monitoring-grafana-578f79599c-qc9gd                      3/3     Running   0          47s   10.244.2.200     <worker-node>   <none>           <none>
pod/monitoring-kube-prometheus-operator-65cdf7995-kndgg      1/1     Running   0          47s   10.244.2.199     <worker-node>   <none>           <none>
pod/monitoring-kube-state-metrics-56bfd4f44f-85l4p           1/1     Running   0          47s   10.244.1.76      <worker-node>   <none>           <none>
pod/monitoring-prometheus-node-exporter-g2x9g                1/1     Running   0          47s   100.102.48.121   <master-node>   <none>           <none>
pod/monitoring-prometheus-node-exporter-p9kkq                1/1     Running   0          47s   100.102.48.84    <worker-node>   <none>           <none>
pod/monitoring-prometheus-node-exporter-rzhrd                1/1     Running   0          47s   100.102.48.28    <worker-node>   <none>           <none>
pod/prometheus-monitoring-kube-prometheus-prometheus-0       2/2     Running   0          35s   10.244.1.79      <worker-node>   <none>           <none>

NAME                                              TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                      AGE   SELECTOR
service/alertmanager-operated                     ClusterIP   None             <none>        9093/TCP,9094/TCP,9094/UDP   36s   app.kubernetes.io/name=alertmanager
service/monitoring-grafana                        ClusterIP   10.110.193.30    <none>        80/TCP                       47s   app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=grafana
service/monitoring-kube-prometheus-alertmanager   ClusterIP   10.104.2.37      <none>        9093/TCP                     47s   alertmanager=monitoring-kube-prometheus-alertmanager,app.kubernetes.io/name=alertmanager
service/monitoring-kube-prometheus-operator       ClusterIP   10.99.162.229    <none>        443/TCP                      47s   app=kube-prometheus-stack-operator,release=monitoring
service/monitoring-kube-prometheus-prometheus     ClusterIP   10.108.161.46    <none>        9090/TCP                     47s   app.kubernetes.io/name=prometheus,prometheus=monitoring-kube-prometheus-prometheus
service/monitoring-kube-state-metrics             ClusterIP   10.111.162.185   <none>        8080/TCP                     47s   app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=kube-state-metrics
service/monitoring-prometheus-node-exporter       ClusterIP   10.109.21.136    <none>        9100/TCP                     47s   app=prometheus-node-exporter,release=monitoring
service/prometheus-operated                       ClusterIP   None             <none>        9090/TCP                     35s   app.kubernetes.io/name=prometheus

NAME                                                 DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR   AGE   CONTAINERS      IMAGES                                    SELECTOR
daemonset.apps/monitoring-prometheus-node-exporter   3         3         3       3            3           <none>          47s   node-exporter   quay.io/prometheus/node-exporter:v1.3.1   app=prometheus-node-exporter,release=monitoring

NAME                                                  READY   UP-TO-DATE   AVAILABLE   AGE   CONTAINERS                                            IMAGES                                                                                          SELECTOR
deployment.apps/monitoring-grafana                    1/1     1            1           47s   grafana-sc-dashboard,grafana-sc-datasources,grafana   quay.io/kiwigrid/k8s-sidecar:1.15.6,quay.io/kiwigrid/k8s-sidecar:1.15.6,grafana/grafana:8.4.2   app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=grafana
deployment.apps/monitoring-kube-prometheus-operator   1/1     1            1           47s   kube-prometheus-stack                                 quay.io/prometheus-operator/prometheus-operator:v0.55.0                                         app=kube-prometheus-stack-operator,release=monitoring
deployment.apps/monitoring-kube-state-metrics         1/1     1            1           47s   kube-state-metrics                                    k8s.gcr.io/kube-state-metrics/kube-state-metrics:v2.4.1                                         app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=kube-state-metrics

NAME                                                            DESIRED   CURRENT   READY   AGE   CONTAINERS                                            IMAGES                                                                                          SELECTOR
replicaset.apps/monitoring-grafana-578f79599c                   1         1         1       47s   grafana-sc-dashboard,grafana-sc-datasources,grafana   quay.io/kiwigrid/k8s-sidecar:1.15.6,quay.io/kiwigrid/k8s-sidecar:1.15.6,grafana/grafana:8.4.2   app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=grafana,pod-template-hash=578f79599c
replicaset.apps/monitoring-kube-prometheus-operator-65cdf7995   1         1         1       47s   kube-prometheus-stack                                 quay.io/prometheus-operator/prometheus-operator:v0.55.0                                         app=kube-prometheus-stack-operator,pod-template-hash=65cdf7995,release=monitoring
replicaset.apps/monitoring-kube-state-metrics-56bfd4f44f        1         1         1       47s   kube-state-metrics                                    k8s.gcr.io/kube-state-metrics/kube-state-metrics:v2.4.1                                         app.kubernetes.io/instance=monitoring,app.kubernetes.io/name=kube-state-metrics,pod-template-hash=56bfd4f44f

NAME                                                                    READY   AGE   CONTAINERS                     IMAGES
statefulset.apps/alertmanager-monitoring-kube-prometheus-alertmanager   1/1     36s   alertmanager,config-reloader   quay.io/prometheus/alertmanager:v0.23.0,quay.io/prometheus-operator/prometheus-config-reloader:v0.55.0
statefulset.apps/prometheus-monitoring-kube-prometheus-prometheus       1/1     35s   prometheus,config-reloader     quay.io/prometheus/prometheus:v2.33.5,quay.io/prometheus-operator/prometheus-config-reloader:v0.55.0

Add the NodePort

  1. Edit the grafana service to add the NodePort:

    $ kubectl edit service/<deployment_name>-grafana -n <namespace>
    

    For example:

    $ kubectl edit service/monitoring-grafana -n monitoring
    

    Note: This opens an edit session for the domain where parameters can be changed using standard vi commands.

    Change the ports entry and add nodePort: 30091 and type: NodePort:

      ports:
      - name: http-web
        nodePort: 30091
        port: 80
        protocol: TCP
        targetPort: 3000
      selector:
        app.kubernetes.io/instance: monitoring
        app.kubernetes.io/name: grafana
      sessionAffinity: None
      type: NodePort
    
  2. Save the file and exit (:wq).

Verify Using Grafana GUI

  1. Access the Grafana GUI using http://<HostIP>:<nodeport> and login with admin/prom-operator. Change the password when prompted.

  2. Download the K8 Cluster Detail Dashboard json file from: https://grafana.com/grafana/dashboards/10856.

  3. Import the Grafana dashboard by navigating on the left hand menu to Create > Import. Click Upload JSON file and select the json downloaded file. In the Prometheus drop down box select Prometheus. Click Import. The dashboard should be displayed.

  4. Verify your installation by viewing some of the customized dashboard views.