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# `check_lvm_thinpools`
This is a re-implementation of the Perl [`check_lvm_thinpools`](https://github.com/neingeist/check_lvm_thinpools/). That is used to check the free capacity in Linux Logical Volume Manager (LVM) [thin pools](https://www.linux.org/docs/man7/lvmthin.html).
The check uses the [nagiosplugin](https://pypi.org/project/nagiosplugin/) framework to output metrics. Multiple thin pools are supported too.
```
$ ./check_lvm_thinpools
LVMTHINPOOLS OK - data percent (workhero_nvme/nvmepool) is 61.78% | 'data_workhero_nvme/nvmepool'=61.78%;70;90;0;100 'meta_workhero_nvme/nvmepool'=34.21%;70;90;0;100 data_percent=61.78%;70;90;0;100 metadata_percent=34.21%;70;90;0;100
```
Supported command line arguments can be listed with the `--help` command line argument.
```
$ ./check_lvm_thinpools --help
usage: check_lvm_thinpools [-h] [--dpw RANGE] [--dpc RANGE] [--mpw RANGE] [--mpc RANGE] [-v]
options:
-h, --help show this help message and exit
--dpw RANGE, --data-warning-percent RANGE
--dpc RANGE, --data-critical-percent RANGE
--mpw RANGE, --metadata-warning-percent RANGE
--mpc RANGE, --metadata-critical-percent RANGE
-v, --verbose increase output verbosity (use up to 3 times)
```
The user that runs the check must be allowed to execute `/sbin/lvs` via `sudo`.

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#!/usr/bin/env python3
import argparse
from pprint import pprint
from subprocess import check_output
import nagiosplugin
def lvs_output():
return [
line.strip().split(":", 5)
for line in check_output(
[
"sudo",
"lvs",
"--noheadings",
"--separator",
":",
"--select",
"lv_attr =~ ^t",
"-o",
"lvattr,lv_name,vg_name,data_percent,metadata_percent",
],
env={"LC_ALL": "C"},
encoding="UTF-8",
).splitlines()
]
class LVMThinPools(nagiosplugin.Resource):
def __init__(self):
self.pool_data = lvs_output()
def get_lv_names(self):
return [f"{vg_name}/{lv_name}" for _, lv_name, vg_name, _, _ in self.pool_data]
def probe(self):
data_max = 0.0
metadata_max = 0.0
metrics = []
for lv_attr, lv_name, vg_name, data_percent, metadata_percent in self.pool_data:
metrics += [
nagiosplugin.Metric(
f"data_{vg_name}/{lv_name}",
float(data_percent),
"%",
0,
100,
),
nagiosplugin.Metric(
f"meta_{vg_name}/{lv_name}",
float(metadata_percent),
"%",
0,
100,
),
]
data_max = max(data_max, float(data_percent))
metadata_max = max(metadata_max, float(metadata_percent))
metrics += [
nagiosplugin.Metric("data_percent", data_max, "%", 0, 100),
nagiosplugin.Metric("metadata_percent", metadata_max, "%", 0, 100),
]
return metrics
def parse_args():
argp = argparse.ArgumentParser()
argp.add_argument("--dpw", "--data-warning-percent", metavar="RANGE", default="70")
argp.add_argument("--dpc", "--data-critical-percent", metavar="RANGE", default="90")
argp.add_argument(
"--mpw", "--metadata-warning-percent", metavar="RANGE", default="70"
)
argp.add_argument(
"--mpc", "--metadata-critical-percent", metavar="RANGE", default="90"
)
argp.add_argument(
"-v",
"--verbose",
action="count",
default=0,
help="increase output verbosity (use up to 3 times)",
)
return argp.parse_args()
@nagiosplugin.guarded
def main():
args = parse_args()
pools = LVMThinPools()
check = nagiosplugin.Check(
pools,
nagiosplugin.ScalarContext("data_percent", args.dpw, args.dpc),
nagiosplugin.ScalarContext("metadata_percent", args.mpw, args.mpc),
)
for lv_full_name in pools.get_lv_names():
check.add(nagiosplugin.ScalarContext(f"data_{lv_full_name}", args.dpw, args.dpc,
"data percent (%s) is {valueunit}" % lv_full_name))
check.add(nagiosplugin.ScalarContext(f"meta_{lv_full_name}", args.dpw, args.dpc,
"meta data percent (%s) is {valueunit}" % lv_full_name))
check.main(args.verbose)
if __name__ == "__main__":
main()

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nagios ALL = (root) NOPASSWD: /usr/lib/nagios/plugins/check_lvm_thinpools

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# This file is automatically @generated by Poetry 1.5.1 and should not be changed by hand.
[[package]]
name = "nagiosplugin"
version = "1.2.4"
description = "Class library for writing Nagios (Icinga) plugins"
optional = false
python-versions = "*"
files = [
{file = "nagiosplugin-1.2.4.tar.gz", hash = "sha256:6b020aca516f3643ad02378866d382f0296bf378fa3874d9b2e1d3cc6135f8bb"},
]
[package.extras]
test = ["setuptools"]
[metadata]
lock-version = "2.0"
python-versions = "^3.7"
content-hash = "d2559a93a0eca91fe28a4f85f78e4d42d8b8290ef9607ce0c929d53c160f3587"

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[tool.poetry]
name = "check-lvm-thinpools"
version = "0.1.0"
description = "check_lvm_thinpools in Python"
authors = ["Jan Dittberner <jandd@cacert.org>"]
license = "Apache-2.0"
readme = "README.md"
packages = [{include = "check_lvm_thinpools"}]
[tool.poetry.dependencies]
python = "^3.7"
nagiosplugin = "1.2.4"
[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"