How to collect metrics and ship to existing prometheus grafana setup

MongoDB Percona Operator for MongoDB
1

Hi friends,

we are switching our mongodb deployment from using bitnami charts/bitnami/mongodb at main · bitnami/charts · GitHub to use the percona operator.
In our bitnami solution we have setup the metric server via (charts/values.yaml at main · bitnami/charts · GitHub)

We have an existing prometheus/grafana setup via kube-prometheus-stack helm-charts/charts/kube-prometheus-stack at main · prometheus-community/helm-charts · GitHub

We are wondering if its possible to install a metric server that allows us to ship metrics so we can view the state of our mongodb instance in our existing grafana solution.

Im aware of something called PMM Percona Monitoring and Management but we are unsure if we are able to use this with our existing setup or what im assuming this is an alternative to our kube-prometheus-stack setup.

–

Just reading furtheri nto the documentation i noticed its possible to have a sidecar, would the solution here to have a sidecar running mognodb-exporter. Is there an example of this somewhere?

    sidecars:
    - image: percona/mongodb_exporter:0.36
      env:
      - name: EXPORTER_USER
        valueFrom:
          secretKeyRef:
            name: psmdb-db-secrets
            key: MONGODB_CLUSTER_MONITOR_USER
      - name: EXPORTER_PASS
        valueFrom:
          secretKeyRef:
            name: psmdb-db-secrets
            key: MONGODB_CLUSTER_MONITOR_PASSWORD
      - name: POD_IP
        valueFrom:
          fieldRef:
            fieldPath: status.podIP
      - name: MONGODB_URI
        value: "mongodb://$(EXPORTER_USER):$(EXPORTER_PASS)@$(POD_IP):27017"
      args: ["--discovering-mode", "--compatible-mode", "--log.level=debug", "--mongodb.uri=$(MONGODB_URI)"]
      name: rs-sidecar-1

I installed the mongod_exporter as a sidecar, but the metrics is not being picked up by prometheus ( can’t see it in the service discovery )

What am i doing wrong here?

2

Okay i managed to get this working I think. I’ll leave the solution here incase anyone needs it.

Need to setup mongodb exporter as a sidecar. And then you must setup a service and a service monitor so prometheus can begin to scrape the data.

honestly wish creating of the service & service monitor was integrated into this helm, if i was not such a noob at helm i would make a PR myself.

psmdb-db.values.yaml

    sidecars:
    - image: percona/mongodb_exporter:0.36
      env:
      - name: EXPORTER_USER
        valueFrom:
          secretKeyRef:
            name: psmdb-db-secrets
            key: MONGODB_CLUSTER_MONITOR_USER
      - name: EXPORTER_PASS
        valueFrom:
          secretKeyRef:
            name: psmdb-db-secrets
            key: MONGODB_CLUSTER_MONITOR_PASSWORD
      - name: POD_IP
        valueFrom:
          fieldRef:
            fieldPath: status.podIP
      - name: MONGODB_URI
        value: "mongodb://$(EXPORTER_USER):$(EXPORTER_PASS)@$(POD_IP):27017"
      args: ["--discovering-mode", "--compatible-mode", "--collect-all", "--log.level=debug", "--mongodb.uri=$(MONGODB_URI)"]
      name: metrics

metrics-service.yaml

apiVersion: v1
kind: Service
metadata:
  name: psmdb-metrics
  namespace: mongodb
  labels:
    app: psmdb-metrics
    app.kubernetes.io/instance: psmdb-db
    app.kubernetes.io/component: metrics
  annotations:
    prometheus.io/path: /metrics
    prometheus.io/port: '9216'
    prometheus.io/scrape: 'true'
spec:
  ports:
  - name: http-metrics 
    port: 9216 
    targetPort: 9216
    protocol: TCP
  selector:
    app.kubernetes.io/instance: psmdb-db
---
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: psmdb-metrics-servicemonitor
  namespace: monitoring
  labels:
    app.kubernetes.io/instance: psmdb-db
    app.kubernetes.io/component: metrics
spec:
  namespaceSelector:
    matchNames:
      - mongodb
  selector:
    matchLabels:
      app.kubernetes.io/instance: psmdb-db
      app.kubernetes.io/component: metrics
  endpoints:
  - port: http-metrics
    interval: 15s

image
image2531×662 132 KB

1 Like
3

Hi @Kay_Khan, we have integration with PMM. You can deploy the PMM server and enable pmm client via CR very easily. Try to use our product and provide feedback for us. Thanks.

4

I understand.

I think you misunderstood my requirements, i wanted the ability to collect metrics and ship them to an existing prometheus/grafana setup.

If im not mistaken PMM would be an entirely new deployment, an alternative to our existing kube-prometheus-stack setup.