prometheus: move node-exporter to the host network for accurate traffic stats

docker-compose.yml

@@ -254,8 +254,9 @@ services:
       - "traefik.http.routers.prometheus_app.tls.certresolver=myresolver"
       - "traefik.http.routers.prometheus_app.middlewares=traefik_api_auth"
       - "traefik.http.services.prometheus_app.loadbalancer.server.port=9090"
-        #extra_hosts:
-        #  - "host.docker.internal:host-gateway"
+    extra_hosts:
+      # To be able to reach node-exporter which listens on the host network.
+      - "host.docker.internal:host-gateway"
 
   grafana:
     image: grafana/grafana
@@ -289,19 +290,15 @@ services:
     container_name: node-exporter
     restart: unless-stopped
     <<: *logging
-    #network_mode: host
+    # Put node-exporter on the host network to get meaningful network stats.
+    network_mode: host
     pid: host
     volumes:
-      #- /proc:/host/proc:ro
-      #- /sys:/host/sys:ro
       - /:/rootfs:ro,rslave
       - /etc/timezone:/etc/timezone:ro
       - /etc/localtime:/etc/localtime:ro
     command:
-      #- '--path.procfs=/host/proc'
       - '--path.rootfs=/rootfs'
-      #- '--path.sysfs=/host/sys'
-      #- '--collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc)($$|/)'
     expose:
       - 9100
 

prometheus/prometheus.yml

@@ -10,7 +10,7 @@ scrape_configs:
 
 - job_name: 'node'
   static_configs:
-  - targets: ['node-exporter:9100'] 
+  - targets: ['host.docker.internal:9100']
 
 - job_name: 'loki'
   static_configs: