Instalando graphana y prometheus en un cluster¶

Buscar el paquete en artifacts hub: kube-prometheus-stack
Instalar el paquete:

$ helm repo add prom-repo https://prometheus-community.github.io/helm-charts
    #"prom-repo" has been added to your repositories
$ helm repo  update
    # Hang tight while we grab the latest from your chart repositories...
    # ...Successfully got an update from the "prom-repo" chart repository
    # ...Successfully got an update from the "prometheus-community" chart repository
    # ...Successfully got an update from the "bitnami" chart repository
    # ...Successfully got an update from the "strimzi" chart repository
    # Update Complete. ⎈Happy Helming!⎈
$  helm install my-kube-prometheus-stack prom-repo/kube-prometheus-stack
    # NAME: my-kube-prometheus-stack
    # LAST DEPLOYED: Tue Sep  6 12:43:31 2022
    # NAMESPACE: default
    # STATUS: deployed
    # REVISION: 1
    # NOTES:
    # kube-prometheus-stack has been installed. Check its status by running:
    #   kubectl --namespace default get pods -l "release=my-kube-prometheus-stack"

    # Visit https://github.com/prometheus-operator/kube-prometheus for instructions on how to create & configure Alertmanager and Prometheus instances using the Operator.

Ver todo lo que se instalo
```
    NAME               NAME         
```
name="__codelineno-1-1" href="#__codelineno-1-1">$ kubectl get all READY STATUS RESTARTS AGE pod/alertmanager-my-kube-prometheus-stack-alertmanager-0 2/2 Running 0 75s pod/my-kube-prometheus-stack-grafana-f6f4b9bbf-4t6xx 3/3 Running 0 78s pod/my-kube-prometheus-stack-kube-state-metrics-7db8d845ff-fw6ww 1/1 Running 0 78s pod/my-kube-prometheus-stack-operator-5fc76fc95d-r8zgt 1/1 Running 0 78s pod/my-kube-prometheus-stack-prometheus-node-exporter-pdsgh 1/1 Running 0 78s pod/my-release-nginx-86445978c4-cqmgj 1/1 Running 2 (38h ago) 5d19h pod/nginx 1/1 Running 4 (38h ago) 92d pod/nginx-app-68cc968bbb-ljl99 1/1 Running 3 (38h ago) 6d20h pod/prometheus-my-kube-prometheus-stack-prometheus-0 2/2 Running 0 74s TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE service/alertmanager-operated ClusterIP None <none> 9093/TCP,9094/TCP,9094/UDP 75s service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 92d service/my-kube-prometheus-stack-alertmanager ClusterIP 10.103.81.182 <none> 9093/TCP 78s service/my-kube-prometheus-stack-grafana ClusterIP 10.109.202.64 <none> 80/TCP 78s service/my-kube-prometheus-stack-kube-state-metrics ClusterIP 10.103.232.64 <none> 8080/TCP 78s service/my-kube-prometheus-stack-operator ClusterIP 10.104.93.232 <none> 443/TCP 78s service/my-kube-prometheus-stack-prometheus ClusterIP 10.97.75.96 <none> 9090/TCP 78s service/my-kube-prometheus-stack-prometheus-node-exporter ClusterIP 10.97.206.26 <none> 9100/TCP 78s
Para poder acceder al dashboard de grapaha se debe exponer el servicio service/my-kube-prometheus-stack-grafana en este caso con un NodePort, para eso hay que editar el servicio

$ kubectl edit  svc my-kube-prometheus-stack-grafana

Se deben hacer las siguientes modificaciones: - Cambiar spec.type por NodePort - Agregar spec.ports.nodeport con el valor 30001, este atributo no funciona con los servicios ClusterIP

Antes

apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: my-kube-prometheus-stack
    meta.helm.sh/release-namespace: default
  creationTimestamp: "2022-09-06T17:43:39Z"
  labels:
    app.kubernetes.io/instance: my-kube-prometheus-stack
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: grafana
    app.kubernetes.io/version: 9.0.5
    helm.sh/chart: grafana-6.32.10
  name: my-kube-prometheus-stack-grafana
  namespace: default
  resourceVersion: "1054945"
  uid: 6be59343-45db-4dc3-a5d0-7f1f890baf92
spec:
  clusterIP: 10.109.202.64
  clusterIPs:
  - 10.109.202.64
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - name: http-web
    port: 80
    protocol: TCP
    targetPort: 3000
  type: ClusterIP 
  selector:
    app.kubernetes.io/instance: my-kube-prometheus-stack

Despues

apiVersion: v1
kind: Service
metadata:
  annotations:
    meta.helm.sh/release-name: my-kube-prometheus-stack
    meta.helm.sh/release-namespace: default
  creationTimestamp: "2022-09-06T17:43:39Z"
  labels:
    app.kubernetes.io/instance: my-kube-prometheus-stack
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/name: grafana
    app.kubernetes.io/version: 9.0.5
    helm.sh/chart: grafana-6.32.10
  name: my-kube-prometheus-stack-grafana
  namespace: default
  resourceVersion: "1054945"
  uid: 6be59343-45db-4dc3-a5d0-7f1f890baf92
spec:
  clusterIP: 10.109.202.64
  clusterIPs:
  - 10.109.202.64
  externalTrafficPolicy: Cluster
  internalTrafficPolicy: Cluster
  ipFamilies:
  - IPv4
  ipFamilyPolicy: SingleStack
  ports:
  - name: http-web
    port: 80
    protocol: TCP
    targetPort: 3000 # (1)
    nodePort: 30001 # (2)
  type: NodePort 
  selector:
    app.kubernetes.io/instance: my-kube-prometheus-stack

obtener la ip de minikube

$ minikube ip
    # 192.168.39.104

abrir el navegador en la url 192.168.39.104:30001

Dashboard Graphana