Identity

Unit: prometheus-node-exporter.service (Debian/Ubuntu), node_exporter.service (RHEL/Fedora, manual install)
Binary: /usr/bin/prometheus-node-exporter (package) or /usr/local/bin/node_exporter (manual)
Config: No config file — all configuration is via command-line flags in the systemd unit
Flags location: /etc/default/prometheus-node-exporter (Debian/Ubuntu) or ExecStart= in the unit override
Metrics endpoint: http://localhost:9100/metrics
Distro install: apt install prometheus-node-exporter / dnf install golang-github-prometheus-node-exporter

Key Operations

Operation	Command
Service status	`systemctl status prometheus-node-exporter`
Check metrics endpoint	`curl -s localhost:9100/metrics \| head -50`
Count exposed metrics	`curl -s localhost:9100/metrics \| grep -c '^node_'`
List enabled collectors	`prometheus-node-exporter --help 2>&1 \| grep 'collector\.'`
Filter CPU metrics	`curl -s localhost:9100/metrics \| grep '^node_cpu'`
Check filesystem metrics	`curl -s localhost:9100/metrics \| grep '^node_filesystem'`
Check disk I/O metrics	`curl -s localhost:9100/metrics \| grep '^node_disk'`