node_exporter/README.md

# Node exporter [![Build Status](https://travis-ci.org/prometheus/node_exporter.svg)][travis]

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

## Collectors

There is varying support for collectors on each operating system. The tables
below list all existing collectors and the supported systems.

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

### Enabled by default

Name     | Description | OS
---------|-------------|----
conntrack | Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present). | Linux
cpu | Exposes CPU statistics | Darwin, Dragonfly, FreeBSD
diskstats | Exposes disk I/O statistics from `/proc/diskstats`. | Linux
entropy | Exposes available entropy. | Linux
filefd | Exposes file descriptor statistics from `/proc/sys/fs/file-nr`. | Linux
filesystem | Exposes filesystem statistics, such as disk space used. | FreeBSD, Dragonfly, Linux, OpenBSD
hwmon | Expose hardware monitoring and sensor data from `/sys/class/hwmon/`. | Linux
loadavg | Exposes load average. | Darwin, Dragonfly, FreeBSD, Linux, NetBSD, OpenBSD, Solaris
mdadm | Exposes statistics about devices in `/proc/mdstat` (does nothing if no `/proc/mdstat` present). | Linux
meminfo | Exposes memory statistics. | Dragonfly, FreeBSD, Linux
netdev | Exposes network interface statistics such as bytes transferred. | Dragonfly, FreeBSD, Linux, OpenBSD
netstat | Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`. | Linux
stat | Exposes various statistics from `/proc/stat`. This includes CPU usage, boot time, forks and interrupts. | Linux
textfile | Exposes statistics read from local disk. The `--collector.textfile.directory` flag must be set. | _any_
time | Exposes the current system time. | _any_
vmstat | Exposes statistics from `/proc/vmstat`. | Linux


### Disabled by default

Name     | Description | OS
---------|-------------|----
bonding | Exposes the number of configured and active slaves of Linux bonding interfaces. | Linux
devstat | Exposes device statistics | Dragonfly, FreeBSD
drbd | Exposes Distributed Replicated Block Device statistics | Linux
gmond | Exposes statistics from Ganglia. | _any_
interrupts | Exposes detailed interrupts statistics. | Linux, OpenBSD
ipvs | Exposes IPVS status from `/proc/net/ip_vs` and stats from `/proc/net/ip_vs_stats`. | Linux
ksmd | Exposes kernel and system statistics from `/sys/kernel/mm/ksm`. | Linux
logind | Exposes session counts from [logind](http://www.freedesktop.org/wiki/Software/systemd/logind/). | Linux
megacli | Exposes RAID statistics from MegaCLI. | Linux
meminfo_numa | Exposes memory statistics from `/proc/meminfo_numa`. | Linux
mountstats | Exposes filesystem statistics from `/proc/self/mountstats`. Exposes detailed NFS client statistics. | Linux
nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
ntp | Exposes time drift from an NTP server. | _any_
runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
supervisord | Exposes service status from [supervisord](http://supervisord.org/). | _any_
systemd | Exposes service and system status from [systemd](http://www.freedesktop.org/wiki/Software/systemd/). | Linux
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.) | Linux

### Textfile Collector

The textfile collector is similar to the [Pushgateway](https://github.com/prometheus/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](http://prometheus.io/docs/instrumenting/exposition_formats/).

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
```

## Building and running

    make
    ./node_exporter <flags>

## Running tests

    make test


## Using Docker
The node\_exporter is designed to monitor the host system. It's not recommended
to deploy it as Docker container because it requires access to the host system.
If you need to run it on Docker, you can deploy this exporter using the
[node-exporter Docker
image](https://quay.io/repository/prometheus/node-exporter) with the following
options and bind-mounts:

```bash
docker run -d -p 9100:9100 \
  -v "/proc:/host/proc" \
  -v "/sys:/host/sys" \
  -v "/:/rootfs" \
  --net="host" \
  quay.io/prometheus/node-exporter \
    -collector.procfs /host/proc \
    -collector.sysfs /host/sys \
    -collector.filesystem.ignored-mount-points "^/(sys|proc|dev|host|etc)($|/)"
```

Be aware though that the mountpoint label in various metrics will now have
`/host` as prefix.

[travis]: https://travis-ci.org/prometheus/node_exporter
[hub]: https://hub.docker.com/r/prom/node-exporter/
[circleci]: https://circleci.com/gh/prometheus/node_exporter
[quay]: https://quay.io/repository/prometheus/node-exporter