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* Add bcache collector for Linux This collector gathers metrics related to the Linux block cache (bcache) from sysfs. * Removed commented out code * Use project comment style * Add _sectors to metric name to indicate unit * Really use project comment style * Rename bcache.go to bcache_linux.go * Keep collector namespace clean Rename: - metric -> bcacheMetric - periodStatsToMetrics -> bcachePeriodStatsToMetric * Shorten slice initialization * Change label names to backing_device, cache_device * Remove five minute metrics (keep only total) * Include units in additional metric names * Enable bcache collector by default * Provide metrics in seconds, not nanoseconds * remove metrics with label "all" * Add fixtures, update end-to-end for bcache collector * Move fixtures/sys into tar.gz This changeset moves the collector/fixtures/sys directory into collector/fixtures/sys.tar.gz and tweaks the Makefile to unpack the tarball before tests are run. The reason for this change is that Windows does not allow colons in a path (colons are present in some of the bcache fixture files), nor can it (out of the box) deal with pathnames longer than 260 characters (which we would be increasingly likely to hit if we tried to replace colons with longer codes that are guaranteed not the turn up in regular file names). * Add ttar: plain text archive, replacement for tar This changeset adds ttar, a plain text replacement for tar, and uses it for the sysfs fixture archive. The syntax is loosely based on tar(1). Using a plain text archive makes it possible to review changes without downloading and extracting the archive. Also, when working on the repo, git diff and git log become useful again, allowing a committer to verify and track changes over time. The code is written in bash, because bash is available out of the box on all major flavors of Linux and on macOS. The feature set used is restricted to bash version 3.2 because that is what Apple is still shipping. The programm also works on Windows if bash is installed. Obviously, it does not solve the Windows limitations (path length limited to 260 characters, no symbolic links) that prompted the move to an archive format in the first place.
155 lines
7.6 KiB
Markdown
155 lines
7.6 KiB
Markdown
# Node exporter [][travis]
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[][circleci]
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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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Which collectors are used is controlled by the `--collectors.enabled` 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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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 configurations. | 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
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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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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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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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bonding | Exposes the number of configured and active slaves of Linux bonding interfaces. | Linux
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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 | Linux
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interrupts | Exposes detailed interrupts statistics. | Linux, OpenBSD
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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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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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nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
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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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### Deprecated
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*These collectors will be (re)moved in the future.*
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Name | Description | OS
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gmond | Exposes statistics from Ganglia. | _any_
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megacli | Exposes RAID statistics from MegaCLI. | Linux
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ntp | Exposes time drift from an NTP server. | _any_
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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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## Building and running
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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 Docker container because it requires access to the host system.
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If you need to run it on Docker, you can deploy this exporter using the
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[node-exporter Docker
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image](https://quay.io/repository/prometheus/node-exporter) with the following
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options and bind-mounts:
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```bash
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docker run -d -p 9100:9100 \
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-v "/proc:/host/proc:ro" \
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-v "/sys:/host/sys:ro" \
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-v "/:/rootfs:ro" \
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--net="host" \
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quay.io/prometheus/node-exporter \
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-collector.procfs /host/proc \
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-collector.sysfs /host/sys \
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-collector.filesystem.ignored-mount-points "^/(sys|proc|dev|host|etc)($|/)"
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```
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Be aware though that the mountpoint label in various metrics will now have
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`/host` as prefix.
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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/). It 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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