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Getting Started with Helm Charts (Monitoring using Prometheus Operator)

This document explains how to get started with Scalar products monitoring on Kubernetes using Prometheus Operator (kube-prometheus-stack). Here, we assume that you already have a Mac or Linux environment for testing. We use Minikube in this document, but the steps we will show should work in any Kubernetes cluster.

What we create

We will deploy the following components on a Kubernetes cluster as follows.

+--------------------------------------------------------------------------------------------------+
| +------------------------------------------------------+                     +-----------------+ |
| |                kube-prometheus-stack                 |                     | Scalar Products | |
| |                                                      |                     |                 | |
| | +--------------+  +--------------+  +--------------+ | -----(Monitor)----> |  +-----------+  | |
| | |  Prometheus  |  | Alertmanager |  |   Grafana    | |                     |  | ScalarDB  |  | |
| | +-------+------+  +------+-------+  +------+-------+ |                     |  +-----------+  | |
| |         |                |                 |         |                     |  +-----------+  | |
| |         +----------------+-----------------+         |                     |  | ScalarDL  |  | |
| |                          |                           |                     |  +-----------+  | |
| +--------------------------+---------------------------+                     +-----------------+ |
|                            |                                                                     |
|                            |         Kubernetes                                                  |
+----------------------------+---------------------------------------------------------------------+
                             | <- expose to localhost (127.0.0.1) or use load balancer etc to access
                             |
              (Access Dashboard through HTTP)
                             |
                        +----+----+
                        | Browser |
                        +---------+

Step 1. Start a Kubernetes cluster

First, you need to prepare a Kubernetes cluster. If you use a minikube environment, please refer to the Getting Started with Scalar Helm Charts. If you have already started a Kubernetes cluster, you can skip this step.

Step 2. Prepare a custom values file

Save the sample file scalar-prometheus-custom-values.yaml for kube-prometheus-stack.
Add custom values in the scalar-prometheus-custom-values.yaml as follows.
- settings
  - prometheus.service.type to LoadBalancer
  - alertmanager.service.type to LoadBalancer
  - grafana.service.type to LoadBalancer
  - grafana.service.port to 3000
- Example
```
alertmanager:

  service:
    type: LoadBalancer

...

grafana:

  service:
    type: LoadBalancer
    port: 3000

...

prometheus:

  service:
    type: LoadBalancer

...
```
- Note:
  - If you want to customize the Prometheus Operator deployment by using Helm Charts, you'll need to set the following configurations to monitor Scalar products:
    - Set serviceMonitorSelectorNilUsesHelmValues and ruleSelectorNilUsesHelmValues to false (true by default) so that Prometheus Operator can detect ServiceMonitor and PrometheusRule for Scalar products.
  - If you want to use Scalar Manager, you'll need to set the following configurations to enable Scalar Manager to collect CPU and memory resources:
    - Set kubeStateMetrics.enabled, nodeExporter.enabled, and kubelet.enabled to true.

Step 3. Deploy `kube-prometheus-stack`

Add the prometheus-community helm repository.

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

Create a namespace monitoring on the Kubernetes.
```
kubectl create namespace monitoring
```

Deploy the kube-prometheus-stack.

helm install scalar-monitoring prometheus-community/kube-prometheus-stack -n monitoring -f scalar-prometheus-custom-values.yaml

Step 4. Deploy (or Upgrade) Scalar products using Helm Charts

Note:
- The following explains the minimum steps. If you want to know more details about the deployment of ScalarDB and ScalarDL, please refer to the following documents.

To enable Prometheus monitoring of Scalar products, set true to the following configurations in the custom values file.

Configurations
- *.prometheusRule.enabled
- *.grafanaDashboard.enabled
- *.serviceMonitor.enabled

Sample configuration files

ScalarDB (scalardb-custom-values.yaml)

envoy:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

scalardb:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

ScalarDL Ledger (scalardl-ledger-custom-values.yaml)

envoy:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

ledger:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

ScalarDL Auditor (scalardl-auditor-custom-values.yaml)

envoy:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

auditor:
  prometheusRule:
    enabled: true
  grafanaDashboard:
    enabled: true
  serviceMonitor:
    enabled: true

Deploy (or Upgrade) Scalar products using Helm Charts with the above custom values file.

Examples

ScalarDB

helm install scalardb scalar-labs/scalardb -f ./scalardb-custom-values.yaml

helm upgrade scalardb scalar-labs/scalardb -f ./scalardb-custom-values.yaml

ScalarDL Ledger

helm install scalardl-ledger scalar-labs/scalardl -f ./scalardl-ledger-custom-values.yaml

helm upgrade scalardl-ledger scalar-labs/scalardl -f ./scalardl-ledger-custom-values.yaml

ScalarDL Auditor

helm install scalardl-auditor scalar-labs/scalardl-audit -f ./scalardl-auditor-custom-values.yaml

helm upgrade scalardl-auditor scalar-labs/scalardl-audit -f ./scalardl-auditor-custom-values.yaml

Step 5. Access Dashboards

If you use minikube

To expose each service resource as your localhost (127.0.0.1), open another terminal, and run the minikube tunnel command.

minikube tunnel

After running the minikube tunnel command, you can see the EXTERNAL-IP of each service resource as 127.0.0.1.

kubectl get svc -n monitoring scalar-monitoring-kube-pro-prometheus scalar-monitoring-kube-pro-alertmanager scalar-monitoring-grafana

[Command execution result]

NAME                                      TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
scalar-monitoring-kube-pro-prometheus     LoadBalancer   10.98.11.12    127.0.0.1     9090:30550/TCP   26m
scalar-monitoring-kube-pro-alertmanager   LoadBalancer   10.98.151.66   127.0.0.1     9093:31684/TCP   26m
scalar-monitoring-grafana                 LoadBalancer   10.103.19.4    127.0.0.1     3000:31948/TCP   26m

Access each Dashboard.

Prometheus
```
http://localhost:9090/
```
Alertmanager
```
http://localhost:9093/
```

Grafana

http://localhost:3000/

Note:

You can see the user and password of Grafana as follows.

user

kubectl get secrets scalar-monitoring-grafana -n monitoring -o jsonpath='{.data.admin-user}' | base64 -d

password

kubectl get secrets scalar-monitoring-grafana -n monitoring -o jsonpath='{.data.admin-password}' | base64 -d

If you use other Kubernetes than minikube

If you use a Kubernetes cluster other than minikube, you need to access the LoadBalancer service according to the manner of each Kubernetes cluster. For example, using a Load Balancer provided by cloud service or the kubectl port-forward command.

Step 6. Delete all resources

After completing the Monitoring tests on the Kubernetes cluster, remove all resources.

Terminate the minikube tunnel command. (If you use minikube)
```
Ctrl + C
```

Uninstall kube-prometheus-stack.

helm uninstall scalar-monitoring -n monitoring

Delete minikube. (Optional / If you use minikube)
```
minikube delete --all
```
- Note:
  - If you deploy the ScalarDB or ScalarDL, you need to remove them before deleting minikube.

What we create​

Step 1. Start a Kubernetes cluster​

Step 2. Prepare a custom values file​

Step 3. Deploy kube-prometheus-stack​

Step 4. Deploy (or Upgrade) Scalar products using Helm Charts​

Step 5. Access Dashboards​

If you use minikube​

If you use other Kubernetes than minikube​

Step 6. Delete all resources​