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83 lines
3.3 KiB
83 lines
3.3 KiB
# Node exporter
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[](https://travis-ci.org/prometheus/node_exporter)
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Prometheus exporter for machine metrics, written in Go with pluggable metric
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collectors.
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## Building and running
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make
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./node_exporter <flags>
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The node_exporter uses the [glog][glog] library for logging. With the default
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parameters, nothing will be logged. Use `-logtostderr` to enable logging to
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stderr and `--help` to see more options about logging.
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[glog]: https://godoc.org/github.com/golang/glog
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## Running tests
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make test
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## Available collectors
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By default the build will include the native collectors that expose information
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from `/proc`.
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Which collectors are used is controlled by the `--collectors.enabled` flag.
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### Enabled by default
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Name | Description
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---------|------------
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diskstats | Exposes disk I/O statistics from `/proc/diskstats`.
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filesystem | Exposes filesystem statistics, such as disk space used.
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loadavg | Exposes load average.
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meminfo | Exposes memory statistics from `/proc/meminfo`.
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netdev | Exposes network interface statistics from `/proc/netstat`, such as bytes transferred.
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netstat | Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`.
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stat | Exposes various statistics from `/proc/stat`. This includes CPU usage, boot time, forks and interrupts.
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textfile | Exposes statistics read from local disk. The `--collector.textfile.directory` flag must be set.
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time | Exposes the current system time.
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### Disabled by default
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Name | Description
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---------|------------
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bonding | Exposes the number of configured and active slaves of Linux bonding interfaces.
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gmond | Exposes statistics from Ganglia.
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interrupts | Exposes detailed interrupts statistics from `/proc/interrupts`.
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ipvs | Exposes IPVS status from `/proc/net/ip_vs` and stats from `/proc/net/ip_vs_stats`.
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lastlogin | Exposes the last time there was a login.
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megacli | Exposes RAID statistics from MegaCLI.
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ntp | Exposes time drift from an NTP server.
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runit | Exposes service status from [runit](http://smarden.org/runit/).
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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.)
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## Textfile Collector
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The textfile collector is similar to the [Pushgateway](https://github.com/prometheus/pushgateway),
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in that it allows exporting of statistics from batch jobs. It can also be used
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to export static metrics, such as what role a machine has. The Pushgateway
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should be used for service-level metrics. The textfile module is for metrics
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that are tied to a machine.
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To use it, set the `--collector.textfile.directory` flag on the Node exporter. The
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collector will parse all files in that directory matching the glob `*.prom`
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using the [text
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format](http://prometheus.io/docs/instrumenting/exposition_formats/).
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To atomically push completion time for a cron job:
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```
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echo my_batch_job_completion_time $(date +%s) > /path/to/directory/my_batch_job.prom.$$
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mv /path/to/directory/my_batch_job.prom.$$ /path/to/directory/my_batch_job.prom
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```
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To statically set roles for a machine using labels:
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```
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echo 'role{role="application_server"} 1' > /path/to/directory/role.prom.$$
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mv /path/to/directory/role.prom.$$ /path/to/directory/role.prom
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```
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