Add Prometheus to the kubernetes cluster

[obriensystems]

on m1max mac

michaelobrien@mbp7 rag % kubectl create namespace prometheus          
namespace/prometheus created
michaelobrien@mbp7 rag % kubectl get namespaces
NAME              STATUS   AGE
default           Active   25d
kube-node-lease   Active   25d
kube-public       Active   25d
kube-system       Active   25d
prometheus        Active   11s


apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: prometheus-data-pvc
  namespace: prometheus
spec:
  accessModes:
    - ReadWriteOnce
  volumeMode: Filesystem
  resources:
    requests:
      storage: 2Gi


michaelobrien@mbp7 kubernetes % kubectl apply -f prometheus-storage.yaml 
persistentvolumeclaim/prometheus-data-pvc created
michaelobrien@mbp7 kubernetes % kubectl get pvc -n prometheus 
NAME                  STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   VOLUMEATTRIBUTESCLASS   AGE
prometheus-data-pvc   Bound    pvc-5532fd6a-4bc0-440c-8d0d-831100c231b3   2Gi        RWO            hostpath       <unset>                 28s

michaelobrien@mbp7 kubernetes % kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                            STORAGECLASS   VOLUMEATTRIBUTESCLASS   REASON   AGE
pvc-5532fd6a-4bc0-440c-8d0d-831100c231b3   2Gi        RWO            Delete           Bound    prometheus/prometheus-data-pvc   hostpath       <unset>                          60s

michaelobrien@mbp7 kubernetes % vi prometheus-configmap.yaml
michaelobrien@mbp7 kubernetes % vi prometheus-service.yaml  
michaelobrien@mbp7 kubernetes % vi prometheus-deployment.yaml

michaelobrien@mbp7 kubernetes % cat prometheus-configmap.yaml 
apiVersion: v1
data:
  prometheus.yml: |
    global:
      scrape_interval: 30s 
      scrape_timeout: 25s

    scrape_configs:
      - job_name: "proemtheus"
        static_configs:
          - targets: ["localhost:9090"]

kind: ConfigMap
metadata:
  namespace: prometheus
  name: prometheus-configmap
michaelobrien@mbp7 kubernetes % cat prometheus-service.yaml  
apiVersion: v1
kind: Service
metadata:
  name: prometheus-service
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-backend-protocol: "http"
  namespace: prometheus
  labels:
    app: prometheus
spec:
  type: LoadBalancer
  selector:
    app: prometheus
  ports:
    - protocol: TCP
      port: 9090
      targetPort: 9090
michaelobrien@mbp7 kubernetes % cat prometheus-deployment.yaml 
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: prometheus
  name: prometheus-deploy
  namespace: prometheus
spec:
  replicas: 1
  selector:
    matchLabels:
      app: prometheus
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: kubernetes.io/arch
                operator: In
                values:
                - amd64
                - arm64
      containers:
        - name: prometheus-container
          image: prom/prometheus:latest
          ports:
            - containerPort: 9090
          volumeMounts:
            - name: prometheus-config-file
              mountPath: /etc/prometheus
            - name: prometheus-data-storage
              mountPath: /prometheus
      volumes:
        - name: prometheus-config-file
          configMap:
            name: prometheus-configmap
        - name: prometheus-data-storage
          persistentVolumeClaim:
            claimName: prometheus-data-pvc

michaelobrien@mbp7 kubernetes % kubectl apply -f prometheus-configmap.yaml 
configmap/prometheus-configmap created
michaelobrien@mbp7 kubernetes % kubectl apply -f prometheus-service.yaml  
service/prometheus-service created
michaelobrien@mbp7 kubernetes % kubectl apply -f prometheus-deployment.yaml 
deployment.apps/prometheus-deploy created

michaelobrien@mbp7 kubernetes % kubectl get deployments -n prometheus
NAME                READY   UP-TO-DATE   AVAILABLE   AGE
prometheus-deploy   1/1     1            1           92s

michaelobrien@mbp7 kubernetes % kubectl describe deployment prometheus-deploy -n prometheus
Name:                   prometheus-deploy
Namespace:              prometheus
CreationTimestamp:      Wed, 28 Aug 2024 09:18:07 -0400
Labels:                 app=prometheus
Annotations:            deployment.kubernetes.io/revision: 1
Selector:               app=prometheus
Replicas:               1 desired | 1 updated | 1 total | 1 available | 0 unavailable
StrategyType:           RollingUpdate
MinReadySeconds:        0
RollingUpdateStrategy:  25% max unavailable, 25% max surge
Pod Template:
  Labels:  app=prometheus
  Containers:
   prometheus-container:
    Image:        prom/prometheus:latest
    Port:         9090/TCP
    Host Port:    0/TCP
    Environment:  <none>
    Mounts:
      /etc/prometheus from prometheus-config-file (rw)
      /prometheus from prometheus-data-storage (rw)
  Volumes:
   prometheus-config-file:
    Type:      ConfigMap (a volume populated by a ConfigMap)
    Name:      prometheus-configmap
    Optional:  false
   prometheus-data-storage:
    Type:          PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
    ClaimName:     prometheus-data-pvc
    ReadOnly:      false
  Node-Selectors:  <none>
  Tolerations:     <none>
Conditions:
  Type           Status  Reason
  ----           ------  ------
  Available      True    MinimumReplicasAvailable
  Progressing    True    NewReplicaSetAvailable
OldReplicaSets:  <none>
NewReplicaSet:   prometheus-deploy-7d7d88fd9b (1/1 replicas created)
Events:
  Type    Reason             Age   From                   Message
  ----    ------             ----  ----                   -------
  Normal  ScalingReplicaSet  2m3s  deployment-controller  Scaled up replica set prometheus-deploy-7d7d88fd9b to 1

https://squaredup.com/blog/three-ways-to-run-prometheus/

[obriensystems]

http://127.0.0.1:9090/graph?g0.expr=&g0.tab=1&g0.display_mode=lines&g0.show_exemplars=0&g0.range_input=1h