node_exporter/README.md

Node exporter

Prometheus exporter for machine metrics, written in Go with pluggable metric collectors.

Building and running

make
./node_exporter <flags>

Running tests

make test

Available collectors

By default the build will include the native collectors that expose information from /proc.

Which collectors are used is controlled by the --collectors.enabled flag.

Enabled by default

Name	Description
diskstats	Exposes disk I/O statistics from /proc/diskstats.
filesystem	Exposes filesystem statistics, such as disk space used.
loadavg	Exposes load average.
meminfo	Exposes memory statistics from /proc/meminfo.
netdev	Exposes network interface statistics from /proc/netstat, such as bytes transferred.
netstat	Exposes network statistics from /proc/net/netstat. This is the same information as netstat -s.
stat	Exposes various statistics from /proc/stat. This includes CPU usage, boot time, forks and interrupts.
textfile	Exposes statistics read from local disk. The --collector.textfile.directory flag must be set.
time	Exposes the current system time.

Disabled by default

Name	Description
bonding	Exposes the number of configured and active slaves of Linux bonding interfaces.
gmond	Exposes statistics from Ganglia.
interrupts	Exposes detailed interrupts statistics from /proc/interrupts.
ipvs	Exposes IPVS status from /proc/net/ip_vs and stats from /proc/net/ip_vs_stats.
lastlogin	Exposes the last time there was a login.
megacli	Exposes RAID statistics from MegaCLI.
ntp	Exposes time drift from an NTP server.
runit	Exposes service status from runit.
tcpstat	Exposes TCP connection status information from /proc/net/tcp and /proc/net/tcp6. (Warning: the current version has potential performance issues in high load situations.)

Textfile Collector

The textfile collector is similar to the Pushgateway, in that it allows exporting of statistics from batch jobs. It can also be used to export static metrics, such as what role a machine has. The Pushgateway should be used for service-level metrics. The textfile module is for metrics that are tied to a machine.

To use it, set the --collector.textfile.directory flag on the Node exporter. The collector will parse all files in that directory matching the glob *.prom using the text format.

To atomically push completion time for a cron job:

echo my_batch_job_completion_time $(date +%s) > /path/to/directory/my_batch_job.prom.$$
mv /path/to/directory/my_batch_job.prom.$$ /path/to/directory/my_batch_job.prom

To statically set roles for a machine using labels:

echo 'role{role="application_server"} 1' > /path/to/directory/role.prom.$$
mv /path/to/directory/role.prom.$$ /path/to/directory/role.prom