I want to monitor a couple applications running on a Kubernetes cluster in namespaces named development and production through prometheus-operator.
Installation command used (as per Github) is:
helm install prometheus-operator stable/prometheus-operator -n production --set prometheusOperator.enabled=true,prometheus.service.type=NodePort,prometheusOperator.service.type=NodePort,alertmanager.service.type=NodePort,grafana.service.type=NodePort,grafana.service.nodePort=30906
What parameters do I need to add to above command to have prometheus-operator discover and monitor all apps/services/pods running in all namespaces?
With this, Service Discovery only shows some prometheus-operator related services, but not the app that I am running within 'production' namespace even though prometheus-operator is installed in the same namespace.
Anything I am missing?
Note - Am running performing all actions using the same user (which uses the $HOME/.kube/config file), so I assume permissions are not an issue.
kubectl version - v1.17.3 helm version - 3.1.2
P.S. There are numerous articles on this on different forums, but am still not finding simple and direct answers for this.
no its fine but you can create new namespace for monitoring and install prometheus over there would be good to manage things related to monitoring.
helm install prometheus-operator stable/prometheus-operator -n monitoringYou need to create a service for the pod and a serviceMonitor custom resource to configure which services in which namespace need to be discovered by prometheus.
kube-state-metrics Service example
apiVersion: v1
kind: Service
metadata:
labels:
app: kube-state-metrics
k8s-app: kube-state-metrics
annotations:
alpha.monitoring.coreos.com/non-namespaced: "true"
name: kube-state-metrics
spec:
ports:
- name: http-metrics
port: 8080
targetPort: metrics
protocol: TCP
selector:
app: kube-state-metricsThis Service targets all Pods with the label k8s-app: kube-state-metrics.
Generic ServiceMonitor example
This ServiceMonitor targets all Services with the label k8s-app (spec.selector) any value, in the namespaces kube-system and monitoring (spec.namespaceSelector).
apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
name: k8s-apps-http
labels:
k8s-apps: http
spec:
jobLabel: k8s-app
selector:
matchExpressions:
- {key: k8s-app, operator: Exists}
namespaceSelector:
matchNames:
- kube-system
- monitoring
endpoints:
- port: http-metrics
interval: 15sI used values.yaml from https://github.com/helm/charts/blob/master/stable/prometheus-operator/values.yaml, modified parameters *NilUsesHelmValues to False and it seems to work fine with that. helm install prometheus-operator stable/prometheus-operator -n monitoring -f values.yaml
Also, like https://stackoverflow.com/users/7889479/anish-kumar-mourya stated, the services do show in Grafana dashboard even though they dont appear in Prometheus UI under Service Discovery or Targets.
Hope this helps other newbies like me.