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Alloy Setup

Log collection stack using Grafana Alloy, Loki, and Grafana.

Architecture

Host logs / Docker logs
        │
        ▼
   Grafana Alloy   (collector)   :12345
        │
        ▼
      Loki         (log store)   :3100
        │
        ▼
    Grafana        (dashboard)   :3000

Services

Service Image Port
Alloy grafana/alloy:latest 12345 (debug UI)
Loki grafana/loki 3100
Grafana grafana/grafana:latest 3000

What Alloy collects

  • System logs — /var/log/*.log
  • Docker container logs — via Docker socket, labeled with container and image
  • App logs (optional, commented out) — /app/logs/*.log with JSON level extraction

Deploy

Grafana + Loki

./deploy-grafana-loki.sh

Alloy

./deploy-alloy.sh

Each script prompts for confirmation before running docker compose up -d.

Configuration

File Purpose
alloy/config.alloy Alloy pipeline — sources, relabeling, Loki endpoint
loki/loki-config.yaml Loki storage and retention settings
grafana/docker-compose.yaml Grafana env vars and volume mounts

Loki endpoint

Set in alloy/config.alloy at the loki.write block:

loki.write "default" {
  endpoint {
    url = "http://<LOKI_IP>:3100/loki/api/v1/push"
  }
}

Update <LOKI_IP> to match your Loki host.

Grafana login

Field Value
URL http://localhost:3000
Username admin
Password Grafana-123