172 lines
8.7 KiB
Markdown
172 lines
8.7 KiB
Markdown
# Node exporter
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[][circleci]
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[](https://buildkite.com/prometheus/node-exporter)
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[][quay]
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[][hub]
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[][goreportcard]
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Prometheus exporter for hardware and OS metrics exposed by \*NIX kernels, written
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in Go with pluggable metric collectors.
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The [WMI exporter](https://github.com/martinlindhe/wmi_exporter) is recommended for Windows users.
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## Collectors
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There is varying support for collectors on each operating system. The tables
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below list all existing collectors and the supported systems.
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Collectors are enabled by providing a `--collector.<name>` flag.
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Collectors that are enabled by default can be disabled by providing a `--no-collector.<name>` flag.
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### Enabled by default
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Name | Description | OS
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---------|-------------|----
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arp | Exposes ARP statistics from `/proc/net/arp`. | Linux
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bcache | Exposes bcache statistics from `/sys/fs/bcache/`. | Linux
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bonding | Exposes the number of configured and active slaves of Linux bonding interfaces. | Linux
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boottime | Exposes system boot time derived from the `kern.boottime` sysctl. | Darwin, Dragonfly, FreeBSD, NetBSD, OpenBSD
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conntrack | Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present). | Linux
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cpu | Exposes CPU statistics | Darwin, Dragonfly, FreeBSD, Linux
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diskstats | Exposes disk I/O statistics. | Darwin, Linux
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edac | Exposes error detection and correction statistics. | Linux
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entropy | Exposes available entropy. | Linux
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exec | Exposes execution statistics. | Dragonfly, FreeBSD
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filefd | Exposes file descriptor statistics from `/proc/sys/fs/file-nr`. | Linux
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filesystem | Exposes filesystem statistics, such as disk space used. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
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hwmon | Expose hardware monitoring and sensor data from `/sys/class/hwmon/`. | Linux
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infiniband | Exposes network statistics specific to InfiniBand and Intel OmniPath configurations. | Linux
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ipvs | Exposes IPVS status from `/proc/net/ip_vs` and stats from `/proc/net/ip_vs_stats`. | Linux
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loadavg | Exposes load average. | Darwin, Dragonfly, FreeBSD, Linux, NetBSD, OpenBSD, Solaris
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mdadm | Exposes statistics about devices in `/proc/mdstat` (does nothing if no `/proc/mdstat` present). | Linux
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meminfo | Exposes memory statistics. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
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netclass | Exposes network interface info from `/sys/class/net/` | Linux
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netdev | Exposes network interface statistics such as bytes transferred. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
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netstat | Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`. | Linux
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nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
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nfsd | Exposes NFS kernel server statistics from `/proc/net/rpc/nfsd`. This is the same information as `nfsstat -s`. | Linux
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sockstat | Exposes various statistics from `/proc/net/sockstat`. | Linux
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stat | Exposes various statistics from `/proc/stat`. This includes boot time, forks and interrupts. | Linux
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textfile | Exposes statistics read from local disk. The `--collector.textfile.directory` flag must be set. | _any_
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time | Exposes the current system time. | _any_
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timex | Exposes selected adjtimex(2) system call stats. | Linux
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uname | Exposes system information as provided by the uname system call. | Linux
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vmstat | Exposes statistics from `/proc/vmstat`. | Linux
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wifi | Exposes WiFi device and station statistics. | Linux
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xfs | Exposes XFS runtime statistics. | Linux (kernel 4.4+)
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zfs | Exposes [ZFS](http://open-zfs.org/) performance statistics. | [Linux](http://zfsonlinux.org/)
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### Disabled by default
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Name | Description | OS
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---------|-------------|----
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buddyinfo | Exposes statistics of memory fragments as reported by /proc/buddyinfo. | Linux
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devstat | Exposes device statistics | Dragonfly, FreeBSD
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drbd | Exposes Distributed Replicated Block Device statistics (to version 8.4) | Linux
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interrupts | Exposes detailed interrupts statistics. | Linux, OpenBSD
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ksmd | Exposes kernel and system statistics from `/sys/kernel/mm/ksm`. | Linux
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logind | Exposes session counts from [logind](http://www.freedesktop.org/wiki/Software/systemd/logind/). | Linux
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meminfo\_numa | Exposes memory statistics from `/proc/meminfo_numa`. | Linux
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mountstats | Exposes filesystem statistics from `/proc/self/mountstats`. Exposes detailed NFS client statistics. | Linux
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ntp | Exposes local NTP daemon health to check [time](./docs/TIME.md) | _any_
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qdisc | Exposes [queuing discipline](https://en.wikipedia.org/wiki/Network_scheduler#Linux_kernel) statistics | Linux
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runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
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supervisord | Exposes service status from [supervisord](http://supervisord.org/). | _any_
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systemd | Exposes service and system status from [systemd](http://www.freedesktop.org/wiki/Software/systemd/). | Linux
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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.) | Linux
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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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### Filtering enabled collectors
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The `node_exporter` will expose all metrics from enabled collectors by default. This is the recommended way to collect metrics to avoid errors when comparing metrics of different families.
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For advanced use the `node_exporter` can be passed an optional list of collectors to filter metrics. The `collect[]` parameter may be used multiple times. In Prometheus configuration you can use this syntax under the [scrape config](https://prometheus.io/docs/prometheus/latest/configuration/configuration/#<scrape_config>).
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```
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params:
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collect[]:
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- foo
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- bar
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```
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This can be useful for having different Prometheus servers collect specific metrics from nodes.
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## Building and running
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Prerequisites:
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* [Go compiler](https://golang.org/dl/)
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* RHEL/CentOS: `glibc-static` package.
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Building:
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go get github.com/prometheus/node_exporter
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cd ${GOPATH-$HOME/go}/src/github.com/prometheus/node_exporter
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make
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./node_exporter <flags>
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To see all available configuration flags:
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./node_exporter -h
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## Running tests
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make test
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## Using Docker
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The `node_exporter` is designed to monitor the host system. It's not recommended
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to deploy it as a Docker container because it requires access to the host system.
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Be aware that any non-root mount points you want to monitor will need to be bind-mounted
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into the container.
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If you start container for host monitoring, specify `path.rootfs` argument.
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This argument must match path in bind-mount of host root. The node\_exporter will use
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`path.rootfs` as prefix to access host filesystem.
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```bash
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docker run -d \
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--net="host" \
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--pid="host" \
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-v "/:/host:ro,rslave" \
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quay.io/prometheus/node-exporter \
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--path.rootfs /host
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```
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On some systems, the `timex` collector requires an additional Docker flag,
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`--cap-add=SYS_TIME`, in order to access the required syscalls.
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## Using a third-party repository for RHEL/CentOS/Fedora
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There is a [community-supplied COPR repository](https://copr.fedorainfracloud.org/coprs/ibotty/prometheus-exporters/) which closely follows upstream releases.
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[travis]: https://travis-ci.org/prometheus/node_exporter
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[hub]: https://hub.docker.com/r/prom/node-exporter/
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[circleci]: https://circleci.com/gh/prometheus/node_exporter
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[quay]: https://quay.io/repository/prometheus/node-exporter
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[goreportcard]: https://goreportcard.com/report/github.com/prometheus/node_exporter
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