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Loki

OverviewInstall

Chart Name	Version	App version
loki	6.53.0	3.6.5

Loki is a horizontally scalable, highly available, multi-tenant log aggregation system inspired by Prometheus. Designed for cloud-native environments, Loki provides a cost-efficient and operationally simple approach to centralized logging.

Unlike traditional logging systems, Loki does not index the full contents of logs. Instead, it indexes only metadata labels associated with each log stream. This architecture significantly reduces storage and infrastructure costs while maintaining powerful query capabilities through LogQL.

Originally developed by Grafana Labs and announced at KubeCon Seattle in 2018, Loki is released under the AGPLv3 license. It integrates natively with Grafana, enabling seamless visualization, exploration, and alerting based on logs.

Key Features

• Horizontally scalable and highly available architecture
• Multi-tenant log aggregation
• Cost-efficient storage model (label-based indexing)
• Native Kubernetes integration
• LogQL query language for advanced filtering and metrics generation
• Tight integration with Grafana for dashboards and alerts

Why Deploy Loki with k0rdent

When deployed via k0rdent, Loki can be consistently installed and managed across multiple Kubernetes clusters, enabling centralized observability in multi-cluster environments. It complements Prometheus-based metrics monitoring by providing unified log visibility at scale.

Prerequisites

Deploy k0rdent v1.0.0: QuickStart

Install template to k0rdent

helm upgrade --install loki oci://ghcr.io/k0rdent/catalog/charts/kgst --set "chart=loki:6.53.0" -n kcm-system

Verify service template

kubectl get servicetemplates -A
# NAMESPACE    NAME                            VALID
# kcm-system   loki-6-53-0                     true

Deploy service template

apiVersion: k0rdent.mirantis.com/v1beta1
kind: MultiClusterService
metadata:
  name: loki
spec:
  clusterSelector:
    matchLabels:
      group: demo
  serviceSpec:
    services:
    - template: loki-6-53-0
      name: loki
      namespace: loki
      values: |
        loki:
          deploymentMode: SingleBinary
          loki:
            auth_enabled: false
            commonConfig:
              replication_factor: 1
            storage:
              type: filesystem
            schemaConfig:
              configs:
                - from: 2024-01-01
                  store: tsdb
                  object_store: filesystem
                  schema: v13
                  index:
                    prefix: index_
                    period: 24h
            storage_config:
              filesystem:
                directory: /var/loki/chunks
            compactor:
              working_directory: /var/loki/compactor
            limits_config:
              allow_structured_metadata: true
              volume_enabled: true
          singleBinary:
            replicas: 1
          read:
            replicas: 0
          write:
            replicas: 0
          backend:
            replicas: 0
          persistence:
            enabled: true
            size: 3Gi

• Official docs