S12 · Evidencia tecnica monitoreo con Prometheus y Grafana

Fecha local de captura: 2026-03-20 22:12:01 AST
Repositorio: DevOps.E2
Carpeta de trabajo: semana12-monitoreo/

[1] Levantar servicios
$ docker compose up -d
 Container devops-e2-s12-node-exporter Running
 Container devops-e2-s12-prometheus Running
 Container devops-e2-s12-grafana Running

[2] Verificar contenedores
$ docker compose ps
NAME                          IMAGE                       COMMAND                  SERVICE         CREATED          STATUS          PORTS
devops-e2-s12-grafana         grafana/grafana:latest      "/run.sh"                grafana         39 seconds ago   Up 38 seconds   0.0.0.0:3000->3000/tcp, [::]:3000->3000/tcp
devops-e2-s12-node-exporter   prom/node-exporter:latest   "/bin/node_exporter"     node-exporter   40 seconds ago   Up 39 seconds   0.0.0.0:9100->9100/tcp, [::]:9100->9100/tcp
devops-e2-s12-prometheus      prom/prometheus:latest      "/bin/prometheus --c…"   prometheus      40 seconds ago   Up 39 seconds   0.0.0.0:9090->9090/tcp, [::]:9090->9090/tcp

[3] Prometheus listo
$ curl -fsS http://127.0.0.1:9090/-/ready
Prometheus Server is Ready.

[4] Targets activos en Prometheus
$ curl -fsS http://127.0.0.1:9090/api/v1/targets | jq -r '.data.activeTargets[] | "\(.labels.job) -> \(.scrapeUrl) [\(.health)]"'
node-exporter -> http://node-exporter:9100/metrics [up]
prometheus -> http://prometheus:9090/metrics [up]

[5] Salud de Grafana
$ curl -fsS -u admin:admin http://127.0.0.1:3000/api/health
{
  "database": "ok",
  "version": "12.4.1",
  "commit": "46a02dc12a085445ab105b72fa159248f7d1dc9d"
}

[6] Fuente de datos aprovisionada
$ curl -fsS -u admin:admin http://127.0.0.1:3000/api/datasources | jq -r '.[] | "\(.name) type=\(.type) url=\(.url) uid=\(.uid) default=\(.isDefault)"'
Prometheus type=prometheus url=http://prometheus:9090 uid=prometheus default=true

[7] Dashboard detectado en Grafana
$ curl -fsS -u admin:admin 'http://127.0.0.1:3000/api/search?query=S12'
[{"id":4053323264102400,"uid":"s12-observabilidad-base","orgId":1,"title":"S12 - Observabilidad Base","uri":"db/s12-observabilidad-base","url":"/d/s12-observabilidad-base/s12-observabilidad-base","slug":"","type":"dash-db","tags":["devops","grafana","prometheus","s12"],"isStarred":false,"folderId":4053323207159808,"folderUid":"afgn5y67usni8f","folderTitle":"Semana 12","folderUrl":"/dashboards/f/afgn5y67usni8f/semana-12","sortMeta":0,"isDeleted":false}]

[8] Paneles cargados en el dashboard
$ curl -fsS -u admin:admin http://127.0.0.1:3000/api/dashboards/uid/s12-observabilidad-base | jq -r '.dashboard.panels[] | .title'
Node Exporter UP
Uso CPU
Uso Memoria
Uptime
CPU en el tiempo
Memoria usada
Carga del sistema
Espacio disponible en disco

[9] Consultas de ejemplo desde Prometheus
$ curl -fsSG 'http://127.0.0.1:9090/api/v1/query' --data-urlencode 'query=100 * (1 - avg(rate(node_cpu_seconds_total{mode="idle"}[5m])))' | jq -r '.data.result[] | "cpu_used_pct=\(.value[1])"'
cpu_used_pct=32.266253264692445

$ curl -fsSG 'http://127.0.0.1:9090/api/v1/query' --data-urlencode 'query=100 * (1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes))' | jq -r '.data.result[] | "mem_used_pct=\(.value[1]) instance=\(.metric.instance)"'
mem_used_pct=9.033654390144086 instance=node-exporter:9100

$ curl -fsSG 'http://127.0.0.1:9090/api/v1/query' --data-urlencode 'query=node_load1' | jq -r '.data.result[] | "load1=\(.value[1]) instance=\(.metric.instance)"'
load1=0.95 instance=node-exporter:9100

$ curl -fsSG 'http://127.0.0.1:9090/api/v1/query' --data-urlencode 'query=node_time_seconds - node_boot_time_seconds' | jq -r '.data.result[] | "uptime_seconds=\(.value[1]) instance=\(.metric.instance)"'
uptime_seconds=387.2918565273285 instance=node-exporter:9100

[10] Conclusion
- La practica S12 queda funcional.
- Prometheus recopila metricas de si mismo y de node-exporter.
- Grafana queda listo con datasource y dashboard sin configuracion manual adicional.

[11] Limpieza del entorno despues de validar
$ docker compose down
 Container devops-e2-s12-grafana Stopping
 Container devops-e2-s12-grafana Stopped
 Container devops-e2-s12-grafana Removing
 Container devops-e2-s12-grafana Removed
 Container devops-e2-s12-node-exporter Stopping
 Container devops-e2-s12-prometheus Stopping
 Container devops-e2-s12-prometheus Stopped
 Container devops-e2-s12-prometheus Removing
 Container devops-e2-s12-prometheus Removed
 Container devops-e2-s12-node-exporter Stopped
 Container devops-e2-s12-node-exporter Removing
 Container devops-e2-s12-node-exporter Removed
 Network semana12-monitoreo_default Removing
 Network semana12-monitoreo_default Removed