mirror of https://github.com/prometheus/node_exporter.git synced 2024-12-28 23:19:46 -08:00

ideaship 8d90276283 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.

2017-07-07 07:20:18 +02:00

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Node exporter

Prometheus exporter for hardware and OS metrics exposed by *NIX kernels, written in Go with pluggable metric collectors.

The WMI exporter is recommended for Windows users.

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
arp	Exposes ARP statistics from `/proc/net/arp`.	Linux
bcache	Exposes bcache statistics from `/sys/fs/bcache/`.	Linux
conntrack	Shows conntrack statistics (does nothing if no `/proc/sys/net/netfilter/` present).	Linux
cpu	Exposes CPU statistics	Darwin, Dragonfly, FreeBSD, Linux
diskstats	Exposes disk I/O statistics.	Darwin, Linux
edac	Exposes error detection and correction statistics.	Linux
entropy	Exposes available entropy.	Linux
exec	Exposes execution statistics.	Dragonfly, FreeBSD
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 configurations.	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.	Darwin, Dragonfly, FreeBSD, Linux
netdev	Exposes network interface statistics such as bytes transferred.	Darwin, Dragonfly, FreeBSD, Linux, OpenBSD
netstat	Exposes network statistics from `/proc/net/netstat`. This is the same information as `netstat -s`.	Linux
sockstat	Exposes various statistics from `/proc/net/sockstat`.	Linux
stat	Exposes various statistics from `/proc/stat`. This includes 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
uname	Exposes system information as provided by the uname system call.	Linux
vmstat	Exposes statistics from `/proc/vmstat`.	Linux
wifi	Exposes WiFi device and station statistics.	Linux
xfs	Exposes XFS runtime statistics.	Linux (kernel 4.4+)
zfs	Exposes ZFS performance statistics.	Linux

Disabled by default

Name	Description	OS
bonding	Exposes the number of configured and active slaves of Linux bonding interfaces.	Linux
buddyinfo	Exposes statistics of memory fragments as reported by /proc/buddyinfo.	Linux
devstat	Exposes device statistics	Dragonfly, FreeBSD
drbd	Exposes Distributed Replicated Block Device statistics	Linux
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.	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
qdisc	Exposes queuing discipline statistics	Linux
runit	Exposes service status from runit.	any
supervisord	Exposes service status from supervisord.	any
systemd	Exposes service and system status from 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

Deprecated

These collectors will be (re)moved in the future.

Name	Description	OS
gmond	Exposes statistics from Ganglia.	any
megacli	Exposes RAID statistics from MegaCLI.	Linux
ntp	Exposes time drift from an NTP server.	any

Textfile Collector

The textfile collector is similar to the 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.

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

go get github.com/prometheus/node_exporter
cd ${GOPATH-$HOME/go}/src/github.com/prometheus/node_exporter
make
./node_exporter <flags>

To see all available configuration flags:

./node_exporter -h

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 with the following options and bind-mounts:

docker run -d -p 9100:9100 \
  -v "/proc:/host/proc:ro" \
  -v "/sys:/host/sys:ro" \
  -v "/:/rootfs:ro" \
  --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.

Using a third-party repository for RHEL/CentOS/Fedora

There is a community-supplied COPR repository. It closely follows upstream releases.

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