make bind mounts readonly, you don't want some node-exporter vulnerability lead to write access on your node

fix collector.sysfs mistakenly use /host/sysfs eventhough sysfs is mounted on /host/sys
fix ignored mountpoints to work with bind mounts
add ignored fs-types to not display a lot of useless NaN and 0 metrics for mounts related to docker
put CLI arguments for command parameter in one value definition, seems like a bug in docker compose, only the first element in an array of commands is used

docker-compose.yml

@@ -32,18 +32,15 @@ services:
       - cadvisor
     networks:
       - back-tier
-  
+
   node-exporter:
     container_name: node-exporter
     image: prom/node-exporter
-    volumes: 
+    volumes:
-      - /proc:/host/proc
+      - /proc:/host/proc:ro
-      - /sys:/host/sys
+      - /sys:/host/sys:ro
-      - /:/rootfs
+      - /:/rootfs:ro
-    command:
+    command: '-collector.procfs=/host/proc -collector.sysfs=/host/sys -collector.filesystem.ignored-mount-points="^(/rootfs|/host|)/(sys|proc|dev|host|etc)($$|/)" collector.filesystem.ignored-fs-types="^(sys|proc|auto|cgroup|devpts|ns|au|fuse\.lxc|mqueue)(fs|)$$"'
-      - '-collector.procfs=/host/proc'
-      - '-collector.sysfs=/host/sysfs'
-      - '-collector.filesystem.ignored-mount-points="^/(sys|proc|dev|host|etc)($$|/)"'
     expose:
       - 9100
     networks:
@@ -52,14 +49,14 @@ services:
     image: prom/alertmanager
     ports:
       - 9093:9093
-    volumes: 
+    volumes:
       - ./alertmanager/:/etc/alertmanager/
     networks:
       - back-tier
     command:
       - '-config.file=/etc/alertmanager/config.yml'
       - '-storage.path=/alertmanager'
-      
+
   cadvisor:
     image: google/cadvisor
     volumes:
@@ -71,7 +68,7 @@ services:
       - 8080
     networks:
       - back-tier
-  
+
   grafana:
     image: grafana/grafana
     depends_on: