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[disk] Add option to exclude pseudo file systems
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Lines changed: 125 additions & 4 deletions

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‎disk/assets/configuration/spec.yaml‎

Lines changed: 27 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -42,15 +42,42 @@ files:
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start matching from the beginning and therefore to match anywhere you
4343
must prepend `.*`. For exact matches append `$`.
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45+
Some Linux kernel pseudo file systems can be excluded by enabling the
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`exclude_pseudofs` option.
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4548
When conflicts arise, this will override `file_system_whitelist`.
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value:
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example:
4851
- tmpfs$
4952
- rootfs$
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- autofs$
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- overlay$
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type: array
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items:
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type: string
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- name: exclude_pseudo_file_systems
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description: |
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Instruct the check to not collect from some common pseudo file systems.
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Works on Linux only.
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The pseudo file systems excluded with this option are:
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- binfmt_misc
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- configfs
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- debugfs
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- devtmpfs
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- overlay
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- proc
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- rootfs
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- securityfs
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- sysfs
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- tmpfs
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- tracefs
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You may cease to ignore a specific pseudo file system by adding it to
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the `file_system_whitelist`.
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value:
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example: true
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type: boolean
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- name: device_whitelist
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description: |
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Instruct the check to only collect from matching devices.

‎disk/datadog_checks/disk/data/conf.yaml.default‎

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -44,12 +44,38 @@ instances:
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## start matching from the beginning and therefore to match anywhere you
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## must prepend `.*`. For exact matches append `$`.
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##
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## Some Linux kernel pseudo file systems can be excluded by enabling the
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## `exclude_pseudofs` option.
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##
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## When conflicts arise, this will override `file_system_whitelist`.
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#
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# file_system_blacklist:
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# - tmpfs$
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# - rootfs$
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# - autofs$
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# - overlay$
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## @param exclude_pseudo_file_systems - boolean - optional - default: true
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## Instruct the check to not collect from some common pseudo file systems.
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## Works on Linux only.
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##
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## The pseudo file systems excluded with this option are:
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## - binfmt_misc
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## - configfs
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## - debugfs
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## - devtmpfs
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## - overlay
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## - proc
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## - rootfs
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## - securityfs
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## - sysfs
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## - tmpfs
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## - tracefs
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##
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## You may cease to ignore a specific pseudo file system by adding it to
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## the `file_system_whitelist`.
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#
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# exclude_pseudo_file_systems: true
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## @param device_whitelist - list of strings - optional
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## Instruct the check to only collect from matching devices.

‎disk/datadog_checks/disk/disk.py‎

Lines changed: 60 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -20,13 +20,42 @@
2020
# See: https://github.com/DataDog/integrations-core/pull/1109#discussion_r167133580
2121
IGNORE_CASE = re.I
2222

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KNOWN_PSEUDO_FILE_SYSTEMS = set()
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2325
def _base_device_name(device):
2426
return device.strip('\\').lower()
2527

2628

29+
elif platform.system() == "Linux":
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IGNORE_CASE = 0
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# Remember to update the configuration specification
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# if modifying the list of pseudo file systems.
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KNOWN_PSEUDO_FILE_SYSTEMS = set(
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[
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'binfmt_msc',
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'configfs',
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'debugfs',
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'devtmpfs',
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'overlay',
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'proc',
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'rootfs',
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'securityfs',
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'sysfs',
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'tmpfs',
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'tracefs',
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]
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)
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def _base_device_name(device):
51+
return os.path.basename(device)
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2754
else:
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IGNORE_CASE = 0
2956

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KNOWN_PSEUDO_FILE_SYSTEMS = set()
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3059
def _base_device_name(device):
3160
return os.path.basename(device)
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@@ -47,6 +76,8 @@ def __init__(self, name, init_config, instances):
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self._all_partitions = is_affirmative(instance.get('all_partitions', False))
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self._file_system_whitelist = instance.get('file_system_whitelist', [])
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self._file_system_blacklist = instance.get('file_system_blacklist', [])
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# FIXME (8.X): Enable pseudo file systems exclusion by default
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self._exclude_pseudo_file_systems = instance.get('exclude_pseudo_file_systems', False)
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self._device_whitelist = instance.get('device_whitelist', [])
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self._device_blacklist = instance.get('device_blacklist', [])
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self._mount_point_whitelist = instance.get('mount_point_whitelist', [])
@@ -88,7 +119,21 @@ def check(self, instance):
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)
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continue
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except Exception as e:
91-
self.log.warning('Unable to get disk metrics for %s: %s', part.mountpoint, e)
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if not self._exclude_pseudo_file_systems and part.fstype in KNOWN_PSEUDO_FILE_SYSTEMS:
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self.log.warning(
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u'Unable to get disk metrics for %s with pseudo file system %s: %s. '
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u'Enable `exclude_pseudo_file_systems` to ignore common pseudo file systems.',
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part.mountpoint,
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part.fstype,
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e,
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)
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else:
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self.log.warning(
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u'Unable to get disk metrics for %s: %s. '
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u'You can exclude this mountpoint in the settings if it is invalid.',
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part.mountpoint,
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e,
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)
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continue
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# Exclude disks with size less than min_disk_size
@@ -147,7 +192,6 @@ def _exclude_disk(self, device, file_system, mount_point):
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"""
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Return True for disks we don't want or that match regex in the config file
149194
"""
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self.log.debug('_exclude_disk: %s, %s, %s', device, file_system, mount_point)
151195

152196
if not device or device == 'none':
153197
device = None
@@ -190,6 +234,14 @@ def _file_system_blacklisted(self, file_system):
190234
if self._file_system_blacklist is None:
191235
return False
192236

237+
# Check if it is a known pseudo file system
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if (
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self._exclude_pseudo_file_systems
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and file_system in KNOWN_PSEUDO_FILE_SYSTEMS
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and not self._file_system_whitelisted(file_system)
242+
):
243+
return True
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193245
return not not self._file_system_blacklist.match(file_system)
194246

195247
def _device_whitelisted(self, device):
@@ -245,7 +297,12 @@ def _collect_inodes_metrics(self, mountpoint):
245297
)
246298
return metrics
247299
except Exception as e:
248-
self.log.warning('Unable to get disk metrics for %s: %s', mountpoint, e)
300+
self.log.warning(
301+
u'Unable to get disk metrics for %s: %s. '
302+
u'You can exclude this mountpoint in the settings if it is invalid.',
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mountpoint,
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e,
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)
249306
return metrics
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251308
if inodes.f_files != 0:

‎disk/tests/test_filter.py‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
from datadog_checks.disk.disk import IGNORE_CASE, Disk
88

99
from .mocks import MockPart
10-
from .utils import assert_regex_equal, requires_windows
10+
from .utils import assert_regex_equal, requires_linux, requires_windows
1111

1212

1313
def test_default_casing():
@@ -104,6 +104,17 @@ def test_file_system_whitelist_blacklist():
104104
assert c.exclude_disk(MockPart(fstype='NTFS')) is True
105105

106106

107+
@requires_linux
108+
def test_exclude_pseudo_file_system():
109+
instance = {'file_system_whitelist': ['tracefs$'], 'exclude_pseudo_file_systems': True}
110+
c = Disk('disk', {}, [instance])
111+
112+
assert c.exclude_disk(MockPart(fstype='debugfs')) is True
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assert c.exclude_disk(MockPart(fstype='tempfs')) is True
114+
assert c.exclude_disk(MockPart(fstype='ext4')) is False
115+
assert c.exclude_disk(MockPart(fstype='tracefs')) is False
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117+
107118
def test_device_whitelist():
108119
instance = {'device_whitelist': ['/dev/sda[1-3]', 'c:']}
109120
c = Disk('disk', {}, [instance])

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