Sensu Plugins Filesystem Checks Plugin

• Overview
• Files
• Usage examples
• Configuration
  • Sensu Go
    • Asset registration
    • Asset definition
    • Check definition
  • Sensu Core
    • Check definition
• Installation from source
• Additional notes
• Contributing

Overview

This plugin provides native instrumentation for monitoring and metrics collection, including health, usage, and various metrics of filesystem attributes.

Files

• bin/check-checksums.rb
• bin/check-ctime.rb
• bin/check-dir-count.rb
• bin/check-dir-size.rb
• bin/check-file-exists.rb
• bin/check-file-size.rb
• bin/check-fs-writable.rb
• bin/check-mtime.rb
• bin/check-tail.rb
• bin/metrics-dirsize.rb
• bin/metrics-filesize.rb
• bin/metrics-nfsstat.rb

check-checksums
Checks a file against its checksum.

check-dir-count
Checks the number of files in a directory.

check-dir-size
Checks the size of a directory using du. Includes optional command line parameter to ignore a missing directory. WARNING: When using this with a directory with many files, there will be some lag as du recursively goes through the directory.

check-file-exists
Checks whether alerting is functioning as designed. Can be set to check for the existence of any file for which you have read-level permissions. Looks in /tmp folder for the files CRITICAL, WARNING, or UNKNOWN and if any are found, sends the corresponding status to Sensu (otherwise, sends an "ok"). This allows you to send an alert for something like touch /tmp/CRITICAL and then set it ok again with rm /tmp/CRITICAL. Supports globbing for basic wildcard matching. Wildcard charaters must be quoted or escaped to prevent shell expansion.

check-file-size
Checks the file size of a given file. Includes optional command line parameters to ignore missing files.

check-fs-writable
Checks that a filesystem is writable. Useful for checking for stale NFS mounts.

check-mtime
Checks a given file's modified time.

check-tail
Checks the tail of a file for a given patten and sends critical (or optional warning) message if found. Alternatively, failure can be triggered when the pattern is not found by passing the 'absent' flag.

metrics-dirsize
Provides a simple wrapper around du for getting directory size stats in real size, apparent size, and inodes (when supported).

metrics-filesize
Provies a simple wrapper around stat for getting file size stats in both in both, bytes and blocks.

metrics-nfsstat
Provides a simple wrapper around nfsstat for getting nfs server/client stats.

Usage examples

Help

check-dir-count.rb

Usage: check-dir-count.rb (options)
    -c, --critical NUM               Critical if count of files is greater than provided number (required)
    -d, --dir DIR                    Directory to count files in (required)
    -w, --warning NUM                Warn if count of files is greater than provided number (required)

metrics-dirsize.rb

Usage: metrics-dirsize.rb (options)
    -a, --apparent                   Report apparent size (bytes) (required)
    -d, --dir PATH                   Absolute path to directory to measure (required)
    -i, --inodes                     Report inodes used instead of bytes. Not all Linux distributions support this. (required)
    -r, --real                       Report real size (bytes) (required)
    -s, --scheme SCHEME              Metric naming scheme, text to prepend to metric (required)

Configuration

Sensu Go

Asset registration

Assets are the best way to make use of this plugin. If you're not using an asset, please consider doing so! If you're using sensuctl 5.13 or later, you can use the following command to add the asset:

sensuctl asset add sensu-plugins/sensu-plugins-logs

If you're using an earlier version of sensuctl, you can download the asset definition from this project's Bonsai asset index page.

Asset definition

---
type: Asset
api_version: core/v2
metadata:
  name: sensu-plugins-filesystem-checks
spec:
  url: https://assets.bonsai.sensu.io/ccce3fd9dd55770aeadd5034b674b763945454ac/sensu-plugins-filesystem-checks_2.0.0_centos_linux_amd64.tar.gz
  sha512: ecac91a77c2e27bb650dcb61a64d62fa92e98ffa1e754008b6b9bd94bf8e6c8862bdaf40ccf65447dd8be5e037acacb3fc2d20e39519167da05b55b0b9c3e880

Check definition

---
type: CheckConfig
spec:
  command: "check-dir-count.rb"
  handlers: []
  high_flap_threshold: 0
  interval: 10
  low_flap_threshold: 0
  publish: true
  runtime_assets:
  - sensu-plugins/sensu-plugins-filesystem-checks
  - sensu/sensu-ruby-runtime
  subscriptions:
  - linux

Sensu Core

Check definition

{
  "checks": {
    "check-dir-count": {
      "command": "check-dir-count.rb",
      "subscribers": ["linux"],
      "interval": 10,
      "refresh": 10,
      "handlers": ["influxdb"]
    }
  }
}

Installation from source

Sensu Go

See the instructions above for asset registration.

Sensu Core

Install and setup plugins on Sensu Core.

Additional notes

Sensu Go Ruby Runtime Assets

The Sensu assets packaged from this repository are built against the Sensu Ruby runtime environment. When using these assets as part of a Sensu Go resource (check, mutator, or handler), make sure to include the corresponding Sensu Ruby Runtime Asset in the list of assets needed by the resource.

Contributing

See CONTRIBUTING.md for information about contributing to this plugin.