Node_Exporter/README.md

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# Node exporter
[![CircleCI](https://circleci.com/gh/prometheus/node_exporter/tree/master.svg?style=shield)][circleci]
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[![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/node_exporter)][goreportcard]
Prometheus exporter for hardware and OS metrics exposed by \*NIX kernels, written
in Go with pluggable metric collectors.
The [Windows exporter](https://github.com/prometheus-community/windows_exporter) is recommended for Windows users.
To expose NVIDIA GPU metrics, [prometheus-dcgm
](https://github.com/NVIDIA/dcgm-exporter)
can be used.
## Installation and Usage
If you are new to Prometheus and `node_exporter` there is a [simple step-by-step guide](https://prometheus.io/docs/guides/node-exporter/).
The `node_exporter` listens on HTTP port 9100 by default. See the `--help` output for more options.
### Ansible
For automated installs with [Ansible](https://www.ansible.com/), there is the [Cloud Alchemy role](https://github.com/cloudalchemy/ansible-node-exporter).
### Docker
The `node_exporter` is designed to monitor the host system. It's not recommended
to deploy it as a Docker container because it requires access to the host system.
For situations where Docker deployment is needed, some extra flags must be used to allow
the `node_exporter` access to the host namespaces.
Be aware that any non-root mount points you want to monitor will need to be bind-mounted
into the container.
If you start container for host monitoring, specify `path.rootfs` argument.
This argument must match path in bind-mount of host root. The node\_exporter will use
`path.rootfs` as prefix to access host filesystem.
```bash
docker run -d \
--net="host" \
--pid="host" \
-v "/:/host:ro,rslave" \
quay.io/prometheus/node-exporter:latest \
--path.rootfs=/host
```
For Docker compose, similar flag changes are needed.
```yaml
---
version: '3.8'
services:
node_exporter:
image: quay.io/prometheus/node-exporter:latest
container_name: node_exporter
command:
- '--path.rootfs=/host'
network_mode: host
pid: host
restart: unless-stopped
volumes:
- '/:/host:ro,rslave'
```
On some systems, the `timex` collector requires an additional Docker flag,
`--cap-add=SYS_TIME`, in order to access the required syscalls.
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## Collectors
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There is varying support for collectors on each operating system. The tables
below list all existing collectors and the supported systems.
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Collectors are enabled by providing a `--collector.<name>` flag.
Collectors that are enabled by default can be disabled by providing a `--no-collector.<name>` flag.
To enable only some specific collector(s), use `--collector.disable-defaults --collector.<name> ...`.
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### Include & Exclude flags
A few collectors can be configured to include or exclude certain patterns using dedicated flags. The exclude flags are used to indicate "all except", while the include flags are used to say "none except". Note that these flags are mutually exclusive on collectors that support both.
Example:
```txt
--collector.filesystem.mount-points-exclude=^/(dev|proc|sys|var/lib/docker/.+|var/lib/kubelet/.+)($|/)
```
List:
Collector | Scope | Include Flag | Exclude Flag
--- | --- | --- | ---
arp | device | --collector.arp.device-include | --collector.arp.device-exclude
cpu | bugs | --collector.cpu.info.bugs-include | N/A
cpu | flags | --collector.cpu.info.flags-include | N/A
diskstats | device | --collector.diskstats.device-include | --collector.diskstats.device-exclude
ethtool | device | N/A | --collector.ethtool.device-exclude
ethtool | metrics | --collector.ethtool.metrics-include | N/A
filesystem | fs-types | N/A | --collector.filesystem.fs-types-exclude
filesystem | mount-points | N/A | --collector.filesystem.mount-points-exclude
netdev | device | --collector.netdev.device-include | --collector.netdev.device-exclude
qdisk | device | --collector.qdisk.device-include | --collector.qdisk.device-exclude
sysctl | all | --collector.sysctl.include | N/A
systemd | unit | --collector.systemd.unit-include | --collector.systemd.unit-exclude
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### Enabled by default
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Name | Description | OS
---------|-------------|----
arp | Exposes ARP statistics from `/proc/net/arp`. | Linux
Add bcache collector (#597) * 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.
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bcache | Exposes bcache statistics from `/sys/fs/bcache/`. | Linux
bonding | Exposes the number of configured and active slaves of Linux bonding interfaces. | Linux
btrfs | Exposes btrfs statistics | Linux
boottime | Exposes system boot time derived from the `kern.boottime` sysctl. | Darwin, Dragonfly, FreeBSD, NetBSD, OpenBSD, Solaris
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conntrack | Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present). | Linux
cpu | Exposes CPU statistics | Darwin, Dragonfly, FreeBSD, Linux, Solaris, OpenBSD
cpufreq | Exposes CPU frequency statistics | Linux, Solaris
diskstats | Exposes disk I/O statistics. | Darwin, Linux, OpenBSD
dmi | Expose Desktop Management Interface (DMI) info from `/sys/class/dmi/id/` | Linux
edac | Exposes error detection and correction statistics. | Linux
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entropy | Exposes available entropy. | Linux
exec | Exposes execution statistics. | Dragonfly, FreeBSD
fibrechannel | Exposes fibre channel information and statistics from `/sys/class/fc_host/`. | Linux
filefd | Exposes file descriptor statistics from `/proc/sys/fs/file-nr`. | Linux
filesystem | Exposes filesystem statistics, such as disk space used. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
hwmon | Expose hardware monitoring and sensor data from `/sys/class/hwmon/`. | Linux
infiniband | Exposes network statistics specific to InfiniBand and Intel OmniPath configurations. | Linux
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
mdadm | Exposes statistics about devices in `/proc/mdstat` (does nothing if no `/proc/mdstat` present). | Linux
meminfo | Exposes memory statistics. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
netclass | Exposes network interface info from `/sys/class/net/` | Linux
netdev | Exposes network interface statistics such as bytes transferred. | Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
netisr | Exposes netisr statistics | FreeBSD
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netstat | Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`. | Linux
nfs | Exposes NFS client statistics from `/proc/net/rpc/nfs`. This is the same information as `nfsstat -c`. | Linux
nfsd | Exposes NFS kernel server statistics from `/proc/net/rpc/nfsd`. This is the same information as `nfsstat -s`. | Linux
nvme | Exposes NVMe info from `/sys/class/nvme/` | Linux
os | Expose OS release info from `/etc/os-release` or `/usr/lib/os-release` | _any_
powersupplyclass | Exposes Power Supply statistics from `/sys/class/power_supply` | Linux
pressure | Exposes pressure stall statistics from `/proc/pressure/`. | Linux (kernel 4.20+ and/or [CONFIG\_PSI](https://www.kernel.org/doc/html/latest/accounting/psi.html))
rapl | Exposes various statistics from `/sys/class/powercap`. | Linux
schedstat | Exposes task scheduler statistics from `/proc/schedstat`. | Linux
selinux | Exposes SELinux statistics. | Linux
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sockstat | Exposes various statistics from `/proc/net/sockstat`. | Linux
softnet | Exposes statistics from `/proc/net/softnet_stat`. | Linux
stat | Exposes various statistics from `/proc/stat`. This includes boot time, forks and interrupts. | Linux
tapestats | Exposes statistics from `/sys/class/scsi_tape`. | Linux
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textfile | Exposes statistics read from local disk. The `--collector.textfile.directory` flag must be set. | _any_
thermal | Exposes thermal statistics like `pmset -g therm`. | Darwin
thermal\_zone | Exposes thermal zone & cooling device statistics from `/sys/class/thermal`. | Linux
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time | Exposes the current system time. | _any_
Add timex collector (#664) This collector is based on adjtimex(2) system call. The collector returns three values, status if time is synchronised, offset to remote reference, and local clock frequency adjustment. Values are taken from kernel time keeping data structures to avoid getting involved how the synchronisation is implemented. By that I mean one should not care if time is update using ntpd, systemd.timesyncd, ptpd, and so on. Since all time sync implementation will always end up telling to kernel what is the status with time one can simply omit the software in between, and look results of the syncing. As a positive side effect this makes collector very quick and conceptually specific, this does not monitor availability of NTP server, or network in between, or dns resolution, and other unrelated but necessary things. Minimum set of values to keep eye on are the following three: The node_timex_sync_status tells if local clock is in sync with a remote clock. Value is set to zero when synchronisation to a reliable server is lost, or a time sync software is misconfigured. The node_timex_offset_seconds tells how much local clock is off when compared to reference. In case of multiple time references this value is outcome of RFC 5905 adjustment algorithm. Ideally offset should be close to zero, and it depends about use case how large value is acceptable. For example a typical web server is probably fine if offset is about 0.1 or less, but that would not be good enough for mobile phone base station operator. The node_timex_freq tells amount of adjustment to local clock tick frequency. For example if offset is one second and growing the local clock will need instruction to tick quicker. Number value itself is not very important, and occasional small adjustments are fine. When frequency is unusually in stable one can assume quality of time stamps will not be accurate to very far in sub second range. Obviously explaining why local clock frequency behaves like a passenger in roller coaster is different matter. Explanations can vary from system load, to environmental issues such as a machine being physically too hot. Rest of the measurements can help when debugging. If you run a clock server do probably want to collect and keep track of everything. Pull-request: https://github.com/prometheus/node_exporter/pull/664
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timex | Exposes selected adjtimex(2) system call stats. | Linux
udp_queues | Exposes UDP total lengths of the rx_queue and tx_queue from `/proc/net/udp` and `/proc/net/udp6`. | Linux
uname | Exposes system information as provided by the uname system call. | Darwin, FreeBSD, Linux, OpenBSD
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vmstat | Exposes statistics from `/proc/vmstat`. | Linux
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xfs | Exposes XFS runtime statistics. | Linux (kernel 4.4+)
zfs | Exposes [ZFS](http://open-zfs.org/) performance statistics. | FreeBSD, [Linux](http://zfsonlinux.org/), Solaris
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### Disabled by default
`node_exporter` also implements a number of collectors that are disabled by default. Reasons for this vary by
collector, and may include:
* High cardinality
* Prolonged runtime that exceeds the Prometheus `scrape_interval` or `scrape_timeout`
* Significant resource demands on the host
You can enable additional collectors as desired by adding them to your
init system's or service supervisor's startup configuration for
`node_exporter` but caution is advised. Enable at most one at a time,
testing first on a non-production system, then by hand on a single
production node. When enabling additional collectors, you should
carefully monitor the change by observing the `
scrape_duration_seconds` metric to ensure that collection completes
and does not time out. In addition, monitor the
`scrape_samples_post_metric_relabeling` metric to see the changes in
cardinality.
Name | Description | OS
---------|-------------|----
buddyinfo | Exposes statistics of memory fragments as reported by /proc/buddyinfo. | Linux
cgroups | A summary of the number of active and enabled cgroups | Linux
devstat | Exposes device statistics | Dragonfly, FreeBSD
drbd | Exposes Distributed Replicated Block Device statistics (to version 8.4) | Linux
ethtool | Exposes network interface information and network driver statistics equivalent to `ethtool`, `ethtool -S`, and `ethtool -i`. | Linux
interrupts | Exposes detailed interrupts statistics. | Linux, OpenBSD
ksmd | Exposes kernel and system statistics from `/sys/kernel/mm/ksm`. | Linux
lnstat | Exposes stats from `/proc/net/stat/`. | Linux
logind | Exposes session counts from [logind](http://www.freedesktop.org/wiki/Software/systemd/logind/). | 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
network_route | Exposes the routing table as metrics | Linux
perf | Exposes perf based metrics (Warning: Metrics are dependent on kernel configuration and settings). | Linux
processes | Exposes aggregate process statistics from `/proc`. | Linux
qdisc | Exposes [queuing discipline](https://en.wikipedia.org/wiki/Network_scheduler#Linux_kernel) statistics | Linux
slabinfo | Exposes slab statistics from `/proc/slabinfo`. Note that permission of `/proc/slabinfo` is usually 0400, so set it appropriately. | Linux
supervisord | Exposes service status from [supervisord](http://supervisord.org/). | _any_
sysctl | Expose sysctl values from `/proc/sys`. Use `--collector.sysctl.include(-info)` to configure. | Linux
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
wifi | Exposes WiFi device and station statistics. | Linux
zoneinfo | Exposes NUMA memory zone metrics. | Linux
### Deprecated
These collectors are deprecated and will be removed in the next major release.
Name | Description | OS
---------|-------------|----
ntp | Exposes local NTP daemon health to check [time](./docs/TIME.md) | _any_
runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
### Perf Collector
The `perf` collector may not work out of the box on some Linux systems due to kernel
configuration and security settings. To allow access, set the following `sysctl`
parameter:
```
sysctl -w kernel.perf_event_paranoid=X
```
- 2 allow only user-space measurements (default since Linux 4.6).
- 1 allow both kernel and user measurements (default before Linux 4.6).
- 0 allow access to CPU-specific data but not raw tracepoint samples.
- -1 no restrictions.
Depending on the configured value different metrics will be available, for most
cases `0` will provide the most complete set. For more information see [`man 2
perf_event_open`](http://man7.org/linux/man-pages/man2/perf_event_open.2.html).
By default, the `perf` collector will only collect metrics of the CPUs that
`node_exporter` is running on (ie
[`runtime.NumCPU`](https://golang.org/pkg/runtime/#NumCPU). If this is
insufficient (e.g. if you run `node_exporter` with its CPU affinity set to
specific CPUs), you can specify a list of alternate CPUs by using the
`--collector.perf.cpus` flag. For example, to collect metrics on CPUs 2-6, you
would specify: `--collector.perf --collector.perf.cpus=2-6`. The CPU
configuration is zero indexed and can also take a stride value; e.g.
`--collector.perf --collector.perf.cpus=1-10:5` would collect on CPUs
1, 5, and 10.
The `perf` collector is also able to collect
[tracepoint](https://www.kernel.org/doc/html/latest/core-api/tracepoint.html)
counts when using the `--collector.perf.tracepoint` flag. Tracepoints can be
found using [`perf list`](http://man7.org/linux/man-pages/man1/perf.1.html) or
from debugfs. And example usage of this would be
`--collector.perf.tracepoint="sched:sched_process_exec"`.
### Sysctl Collector
The `sysctl` collector can be enabled with `--collector.sysctl`. It supports exposing numeric sysctl values
as metrics using the `--collector.sysctl.include` flag and string values as info metrics by using the
`--collector.sysctl.include-info` flag. The flags can be repeated. For sysctl with multiple numeric values,
an optional mapping can be given to expose each value as its own metric. Otherwise an `index` label is used
to identify the different fields.
Release 1.1.0 * Update Build - Update CircleCI orb. - Update CIrcleCI Machine image. - Use golang-builder 1.15. * Update Go modules. * Fixup fixtures for XFS bug. NOTE: We have improved some of the flag naming conventions (PR #1743). The old names are deprecated and will be removed in 2.0. They will continue to work for backwards compatibility. * [CHANGE] Improve filter flag names #1743 * [CHANGE] Add btrfs and powersupplyclass to list of exporters enabled by default #1897 * [FEATURE] Add fibre channel collector #1786 * [FEATURE] Expose cpu bugs and flags as info metrics. #1788 * [FEATURE] Add network_route collector #1811 * [FEATURE] Add zoneinfo collector #1922 * [ENHANCEMENT] Add more InfiniBand counters #1694 * [ENHANCEMENT] Add flag to aggr ipvs metrics to avoid high cardinality metrics #1709 * [ENHANCEMENT] Adding backlog/current queue length to qdisc collector #1732 * [ENHANCEMENT] Include TCP OutRsts in netstat metrics #1733 * [ENHANCEMENT] Add pool size to entropy collector #1753 * [ENHANCEMENT] Remove CGO dependencies for OpenBSD amd64 #1774 * [ENHANCEMENT] bcache: add writeback_rate_debug stats #1658 * [ENHANCEMENT] Add check state for mdadm arrays via node_md_state metric #1810 * [ENHANCEMENT] Expose XFS inode statistics #1870 * [ENHANCEMENT] Expose zfs zpool state #1878 * [ENHANCEMENT] Added an ability to pass collector.supervisord.url via SUPERVISORD_URL environment variable #1947 * [BUGFIX] filesystem_freebsd: Fix label values #1728 * [BUGFIX] Fix various procfs parsing errors #1735 * [BUGFIX] Handle no data from powersupplyclass #1747 * [BUGFIX] udp_queues_linux.go: change upd to udp in two error strings #1769 * [BUGFIX] Fix node_scrape_collector_success behaviour #1816 * [BUGFIX] Fix NodeRAIDDegraded to not use a string rule expressions #1827 * [BUGFIX] Fix node_md_disks state label from fail to failed #1862 * [BUGFIX] Handle EPERM for syscall in timex collector #1938 * [BUGFIX] bcache: fix typo in a metric name #1943 * [BUGFIX] Fix XFS read/write stats (https://github.com/prometheus/procfs/pull/343) Signed-off-by: Ben Kochie <superq@gmail.com>
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#### Examples
##### Numeric values
###### Single values
Using `--collector.sysctl.include=vm.user_reserve_kbytes`:
`vm.user_reserve_kbytes = 131072` -> `node_sysctl_vm_user_reserve_kbytes 131072`
###### Multiple values
A sysctl can contain multiple values, for example:
```
net.ipv4.tcp_rmem = 4096 131072 6291456
```
Using `--collector.sysctl.include=net.ipv4.tcp_rmem` the collector will expose:
```
node_sysctl_net_ipv4_tcp_rmem{index="0"} 4096
node_sysctl_net_ipv4_tcp_rmem{index="1"} 131072
node_sysctl_net_ipv4_tcp_rmem{index="2"} 6291456
```
If the indexes have defined meaning like in this case, the values can be mapped to multiple metrics by appending the mapping to the --collector.sysctl.include flag:
Using `--collector.sysctl.include=net.ipv4.tcp_rmem:min,default,max` the collector will expose:
```
node_sysctl_net_ipv4_tcp_rmem_min 4096
node_sysctl_net_ipv4_tcp_rmem_default 131072
node_sysctl_net_ipv4_tcp_rmem_max 6291456
```
##### String values
String values need to be exposed as info metric. The user selects them by using the `--collector.sysctl.include-info` flag.
###### Single values
`kernel.core_pattern = core` -> `node_sysctl_info{key="kernel.core_pattern_info", value="core"} 1`
###### Multiple values
Given the following sysctl:
```
kernel.seccomp.actions_avail = kill_process kill_thread trap errno trace log allow
```
Setting `--collector.sysctl.include-info=kernel.seccomp.actions_avail` will yield:
```
node_sysctl_info{key="kernel.seccomp.actions_avail", index="0", value="kill_process"} 1
node_sysctl_info{key="kernel.seccomp.actions_avail", index="1", value="kill_thread"} 1
...
```
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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
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
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that are tied to a machine.
To use it, set the `--collector.textfile.directory` flag on the `node_exporter` commandline. The
collector will parse all files in that directory matching the glob `*.prom`
using the [text
format](http://prometheus.io/docs/instrumenting/exposition_formats/). **Note:** Timestamps are not supported.
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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
```
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### Filtering enabled collectors
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.
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>).
```
params:
collect[]:
- foo
- bar
```
This can be useful for having different Prometheus servers collect specific metrics from nodes.
## Development building and running
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Prerequisites:
* [Go compiler](https://golang.org/dl/)
* RHEL/CentOS: `glibc-static` package.
Building:
git clone https://github.com/prometheus/node_exporter.git
cd node_exporter
make build
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./node_exporter <flags>
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To see all available configuration flags:
./node_exporter -h
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## Running tests
make test
## TLS endpoint
** EXPERIMENTAL **
The exporter supports TLS via a new web configuration file.
```console
./node_exporter --web.config.file=web-config.yml
```
See the [exporter-toolkit https package](https://github.com/prometheus/exporter-toolkit/blob/v0.1.0/https/README.md) for more details.
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[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
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[goreportcard]: https://goreportcard.com/report/github.com/prometheus/node_exporter