raynix 筆記

Deploy the Loki Stack in a Kubernetes Cluster with ArgoCD

Loki and Promtail from Grafana Labs are new kids in the observability community. Are they good enough to replace Elasticsearch and Logstash? I would like to see.

Here’s a sample ArgoCD Application to deploy Loki, Promtail, Prometheus and Grafana all from 1 Helm chart: grafana/loki-stack. Some settings of my installations are:

  • loki, grafana and prometheus are deployed separately in their own namespaces
  • loki, grafana and prometheus use existing PVCs. This is more portable if I want to opt out this Helm chart later and keep the data
  • do not use configMap reloader because everything is sync’ed by ArgoCD
apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  name: loki-stack-charts
  namespace: argocd
  finalizers:
  - resources-finalizer.argocd.argoproj.io
spec:
  destination:
    namespace: loki
    server: https://kubernetes.default.svc
  project: default
  source:
    chart: loki-stack
    repoURL: https://grafana.github.io/helm-charts
    targetRevision: 2.5.0
    helm:
      values: |
        loki:
          enabled: true
          persistence:
            type: pvc
            enabled: true
            existingClaim: loki
          securityContext:
            runAsGroup: 10001
            runAsUser: 10001

        promtail:
          enabled: true

        fluent-bit:
          enabled: false

        grafana:
          enabled: true
          namespaceOverride: grafana
          sidecar:
            datasources:
              enabled: false
          image:
            tag: 8.2.2
          persistence:
            type: pvc
            enabled: true
            existingClaim: grafana
          securityContext:
            runAsUser: 472
            runAsGroup: 472
          initChownData:
            enabled: false

        prometheus:
          enabled: true
          forceNamespace: prometheus
          configmapReload:
            prometheus:
              enabled: false
            alertmanager:
              enabled: false
          server:
            persistentVolume:
              enabled: true
              existingClaim: prometheus-server
              accessModes:
                - ReadWriteMany
            resources:
              limits:
                cpu: 800m
                memory: 1Gi
              requests:
                cpu: 500m
                memory: 512Mi
          alertmanager:
            persistentVolume:
              enabled: true
              existingClaim: prometheus-alertmanager
              accessModes:
                - ReadWriteMany
            resources:
              limits:
                cpu: 100m
                memory: 100Mi
              requests:
                cpu: 50m
                memory: 50Mi
          nodeExporter:
            enabled: true
            tolerations:
              - key: node-role.kubernetes.io/master
                effect: NoSchedule
            resources:
              limits:
                cpu: 200m
                memory: 50Mi
              requests:
                cpu: 100m
                memory: 30Mi

        filebeat:
          enabled: false

        logstash:
          enabled: false

For namespace, persistentVolume and Istio resources needed for loki-stack, please see these files.

🙂

admin

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