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[Prometheus] Prometheus to use monitoring k8s

Posted on November 7, 2021March 30, 2023 By nim No Comments on [Prometheus] Prometheus to use monitoring k8s

Bạn có thể tham khảo helm chart sau:
https://prometheus-community.github.io/helm-charts

CHúng ta sẽ sử dụng chart prometheus (không sử dụng chart operator)

Phần dưới này đã bị outdate

helm repo add stable https://charts.helm.sh/stable

helm search repo prometheus-operator
NAME                      	CHART VERSION	APP VERSION	DESCRIPTION                                       
stable/prometheus-operator	9.3.2        	0.38.1     	DEPRECATED Provides easy monitoring definitions...

helm show values stable/prometheus-operator > prometheus-operator.yaml

get password admin grafana:

kubectl get secret --namespace <namespace> <name-deployment-grafana> -o jsonpath="{.data.admin-password}" | base64 --decode ; echo


Nếu bạn đã cài được prometheus thì việc tiếp theo là config như thế nào để monitor được application.
Minh đang có 1 workload là spin-clouddriver bằng 1 số câu lệnh hal config … thì mình đã enable metrics của spinnaker lên được

Đây là cái port để xem metrics của pod monitor
kubectl -n spin port-forward deployments/spin-clouddriver 8008:8008

Mình sử dụng câu lệnh này để forward port của pod ra laptop để test trước

chuẩn bài rồi

Tiếp theo là làm sao để prometheus đọc được metrics này.

chúng ta sẽ sửa dụng thằng ServiceMonitor

Bạn sẽ thấy là serviceMonitor sẽ connect sang service và lấy metrics.

Referent links:
https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/user-guides/getting-started.md
https://stackoverflow.com/questions/52991038/how-to-create-a-servicemonitor-for-prometheus-operator

chúng ta có service như sau:

apiVersion: v1
kind: Service
metadata:
  labels:
    app: spin
    cluster: spin-clouddriver
  name: spin-clouddriver
  namespace: spin
spec:
  ports:
  - port: 7002
    protocol: TCP
    targetPort: 7002
  selector:
    app: spin
    cluster: spin-clouddriver
  type: ClusterIP

Chúng ta sẽ config port service monitor như sau:

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    release: prometheus-operator
  name: spin-clouddriver-metrics
  namespace: spin
spec:
  endpoints:
  - interval: 30s
    path: /prometheus_metrics
    targetPort: 8008
  selector:
    matchLabels:
      cluster: spin-clouddriver
lên target của prometheus được như này là ngon!

How Prometheus Operator facilitates Prometheus configuration updates
https://nakamasato.medium.com/how-prometheus-operator-facilitates-prometheus-configuration-updates-a55844186e04

Prometheus

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