Identity

Loki unit: loki.service (binary install) or grafana-loki.service (package)
Promtail unit: promtail.service
Loki config: /etc/loki/loki-config.yaml (binary), /etc/loki/config.yaml (package)
Promtail config: /etc/promtail/promtail-config.yaml
Loki data: /var/lib/loki/ (chunks, index, WAL, compactor working dir)
Promtail positions: /tmp/positions.yaml (tracks file read offsets; persist across restarts)
Logs: journalctl -u loki, journalctl -u promtail
Install options: pre-built binary from GitHub releases, docker run grafana/loki, Grafana APT/RPM package (apt install loki), Helm chart

Key Operations

Operation	Command
Loki status	`systemctl status loki`
Promtail status	`systemctl status promtail`
Loki readiness	`curl -s http://localhost:3100/ready` → `ready`
Loki metrics endpoint	`curl -s http://localhost:3100/metrics`
Promtail metrics/targets	`curl -s http://localhost:9080/metrics`