RepoMirrors
/
node_exporter
mirror of https://github.com/prometheus/node_exporter
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Add sysctl docs to README.md 

Signed-off-by: Johannes Ziemke <github@5pi.de>
This commit is contained in:
Johannes Ziemke 2022-07-25 16:26:50 +02:00 committed by Johannes 'fish' Ziemke
parent d962e48ca2
commit bc0bff22fd
1 changed files with 77 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
README.md
View File

@ -124,7 +124,6 @@ selinux | Exposes SELinux statistics. | Linux
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
sysctl | Expose sysctl values from `/proc/sys`. Use `--collector.sysctl.include(-info)` to configure. | Linux
tapestats | Exposes statistics from `/sys/class/scsi_tape`. | Linux
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
@ -156,6 +155,35 @@ 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
ntp | Exposes local NTP daemon health to check [time](./docs/TIME.md) | _any_
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
runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
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
### 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:
@ -191,33 +219,56 @@ 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
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
ntp | Exposes local NTP daemon health to check [time](./docs/TIME.md) | _any_
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
runit | Exposes service status from [runit](http://smarden.org/runit/). | _any_
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_
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
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.
#### 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
...
```
### Textfile Collector