This plugin provides native memory instrumentation for monitoring and metrics collection, including memory usage via free and vmstat, including metrics. NOTE: This plugin may have cross-platform issues.
- bin/check-memory.rb
- bin/check-memory.sh
- bin/check-memory-percent.rb
- bin/check-memory-percent.sh
- bin/check-ram.rb
- bin/check-swap-percent.rb
- bin/check-swap.sh
- bin/check-swap.rb
- bin/metrics-memory-percent.rb
- bin/metrics-memory.rb
check-memory Evaluate free system memory for Linux-based systems.
check-memory-percent Evaluate the percentage of free system memory for Linux-based systems.
check-ram Check the percentage of free RAM.
check-swap-percent Checks swap usage as a percentage of the total swap.
check-swap Evaluate swap memory usage for Linux-based systems.
metrics-memory-percent Read memory statistics as a percentage and put them in a form usable by Graphite. Metrics borrowed from HoardD.
metrics-memory-vmstat
Read memory statistics and put them in a form usable by vmstat.
metrics-memory Read memory statistics and put them in a form usable by Graphite. Metrics borrowed from HoardD.
check-ram.rb
Usage: /opt/sensu/embedded/bin/check-ram.rb (options)
-c CRIT
-f, --free checks free threshold, defaults to true
-m, --megabytes Unless --megabytes is specified the thresholds are in percentage of memory used as opposed to MB of ram left
-u, --used checks used threshold, defaults to false
-w WARN
metrics-memory-percent.rb
Usage: /opt/sensu/embedded/bin/metrics-memory-percent.rb (options)
-s, --scheme SCHEME Metric naming scheme, text to prepend to metric
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-memory-checks
If you're using an earlier version of sensuctl, you can download the asset definition from this project's Bonsai Asset Index page.
---
type: Asset
api_version: core/v2
metadata:
name: sensu-plugins-memory-checks
spec:
url: https://assets.bonsai.sensu.io/c5391d4ae186484226732344b35cf95c0b07b8ec/sensu-plugins-memory-checks_4.0.0_centos_linux_amd64.tar.gz
sha512: ea297a85aa3612da7f78d948f9784443fffac511040c5130a2dcde7191a0004044c2ef881e665520cbc64431955ab19920d84de6b5fed85c63da7091c4b93bf0---
type: CheckConfig
spec:
command: "check-memory.rb"
handlers: []
high_flap_threshold: 0
interval: 10
low_flap_threshold: 0
publish: true
runtime_assets:
- sensu-plugins/sensu-plugins-memory-checks
- sensu/sensu-ruby-runtime
subscriptions:
- linux{
"checks": {
"metrics-disk-usage": {
"command": "metric-disk-usage.rb",
"subscribers": ["linux"],
"interval": 10,
"refresh": 10,
"handlers": ["influxdb"]
}
}
}See the instructions above for asset registration
Install and setup plugins on Sensu Core
Ruby does not have a good native way to grab information on memory usage (without using C extensions or running shell commands and parsing out). For this reason, check-ram.rb uses a gem called vmstat that has a dependency on a GCC to compile the C extensions.
To avoid errors that occur when trying to compile the C extensions without GCC present, we do not install the vmstat gem by default.
Users who need to use check-ram.rb must install build tools, including GCC. This usually requires two steps but can vary based on your distribution and Ruby setup:
- Install
gcc. If you are on a Debian system, GCC is located in thebuild-essentialpackage. On RHEL systems,yum groupinstall "Development tools"will provide the required packages. - Install the
vmstatgem into the path from which Sensu gems are expected to run,sudo /opt/sensu/embedded/bin/gem install vmstat --no-rdoc --no-ri, or the equivalent for installing Sensu gems in your configuration management system.
If you are verifying certificates in the gem install you will need the certificate for the sys-filesystem gem loaded in the gem certificate store.
See CONTRIBUTING.md for information about contributing to this plugin.