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@marcos_feitoza/loki

v1.0.0

Published

Este repositório entrega o Loki para armazenamento centralizado de logs Kubernetes.

Downloads

106

Readme

Loki (Armazenamento e consulta de logs)

Este repositório entrega o Loki para armazenamento centralizado de logs Kubernetes.

Papel na arquitetura

  • Recebe logs do Vector.
  • Indexa por labels e armazena conteúdo.
  • Responde consultas LogQL para Grafana.

Integração com Vector e Grafana

Fluxo:

  • Pods -> Vector -> Loki -> Grafana

Onde:

  • Vector envia JSON com labels (namespace, app, pod, container, node).
  • Grafana usa datasource Loki (uid: loki) para dashboards e Explore.

Configuração principal

Arquivo de referência:

  • helm/prod-values.yaml

Pontos atuais:

  • Imagem: grafana/loki:3.6.5
  • Serviço: ClusterIP:3100
  • Retention: 168h (7 dias)
  • Persistência: disabled (logs efêmeros em caso de restart)

Verificação rápida

  • Pod Loki:
kubectl -n monitoring get pods -l app.kubernetes.io/name=loki -o wide
  • Logs Loki:
kubectl -n monitoring logs -l app.kubernetes.io/name=loki --tail=200
  • Teste de saúde via serviço:
kubectl -n monitoring exec <grafana-pod> -- sh -c "wget -qO- http://loki.monitoring.svc.cluster.local:3100/ready"
  • Query de teste no Grafana Explore:
{namespace="monitoring"}

Queries úteis (LogQL)

  • Logs de um app:
{namespace="app", app="personal-finance-backend-market-data-crypto"}
  • Busca por texto no payload:
{namespace="app", app=~".*crypto.*"} |= "Finished Investment Balance Calculation"
  • Busca ampla por termo:
{namespace="app"} |~ "(?i)crypto"

Troubleshooting comum

  • Explore funciona, dashboard não:
    • Revisar variáveis e filtros do painel.
    • Validar datasource do painel (Loki, uid=loki).
  • Sem ingestão:
    • Checar logs do Vector e endpoint Loki.
    • Verificar readiness de Loki.
  • Perda de histórico após restart:
    • Esperado com persistence.enabled: false.

Recomendações

  • Para retenção real em homelab, habilitar persistence.
  • Manter estratégia de labels estáveis para consultas eficientes.