✅ Status • Endpoints • Quick checks

Dashboard

Fast “is everything healthy?” checks: service status, first logs to review, and the go-to commands when something looks off. Keep admin services private — publish only the static site.

Repeatable Logs first Secure defaults Quick triage

Quick actions

Green-check routine

Validate Nginx config and reload safely
Check core services: nginx, docker, tailscale, cloudflared
Confirm disk space and memory aren’t pegged
Check logs: nginx + cloudflared journal

Repeatable Triage Ops

Service status checks

# validate nginx config + reload safely
sudo nginx -t && sudo systemctl reload nginx

# service status checks (no pager)
sudo systemctl status nginx --no-pager
sudo systemctl status docker --no-pager
sudo systemctl status tailscaled --no-pager
sudo systemctl status cloudflared --no-pager

Systemd Nginx Docker

Resource checks

# disk space
df -h

# memory + load
free -h
uptime

# top processes (interactive)
top

CPU RAM Disk

Ports + containers

# listening ports (top)
sudo ss -tulpn | head -n 25

# docker overview
docker ps
docker logs --tail=120 <container_name>

Networking Docker Logs

Logs (first place to look)

# nginx logs
sudo tail -n 120 /var/log/nginx/error.log
sudo tail -n 120 /var/log/nginx/access.log

# cloudflared service logs (systemd)
sudo journalctl -u cloudflared -n 120 --no-pager

# tailscale logs (systemd)
sudo journalctl -u tailscaled -n 120 --no-pager

Habit: when something breaks, capture the last ~50–120 lines of the relevant log and write the verified fix.

Monitoring stack checks (internal-only)

Compose status

cd /opt/monitoring
docker compose ps

Compose Containers

Prometheus readiness + targets

# readiness endpoint
curl -s http://localhost:9095/-/ready && echo

# quick "up" query (targets should be 1)
curl -s "http://localhost:9095/api/v1/query?query=up" | head -c 400 ; echo

Prometheus Targets API

Node Exporter metrics

curl -s http://localhost:9100/metrics | head

Node Exporter Metrics

Monitoring Stack write-up

Full notes: architecture, login, health checks, troubleshooting, and maintenance.

Docs Runbook Observability