sensu/sensu-ruby-runtime (11) Versions 0.0.9-pre.0.1 Community Tier
The Sensu Go Ruby Runtime Asset
The Sensu Go Ruby Runtime Asset
This project provides Sensu Go Assets containing portable Ruby
runtimes (for various platforms), based on the excellent ruby-install project
by postmodern. In practice, this Ruby runtime asset should allow
Ruby-based scripts (e.g. Sensu Community plugins) to be
packaged as separate assets containing Ruby scripts and any corresponding gem
dependencies. In this way, a single shared Ruby runtime may be delivered to
systems running the new Sensu Go Agent via the new Sensu's new Asset framework
(i.e. avoiding solutions that would require a Ruby runtime to be redundantly
packaged with every ruby-based plugin).
This same project may be used to build Sensu Assets for Ruby-based plugins via
bundler
or other similar tools. We'll share more information on
building Ruby-based assets with third-party gem depdencies using Bundler soon;
in the interim, please review the instructions below for more information on
how to get started with this project.
Please note the following instructions:
Use a Docker container to install ruby-install
, build a Ruby, and generate
a local_build Sensu Go Asset.
$ docker build --build-arg "RUBY_VERSION=2.4.4" -t sensu-ruby-runtime:2.4.4-alpine -f Dockerfile.alpine .
$ docker build --build-arg "RUBY_VERSION=2.4.4" -t sensu-ruby-runtime:2.4.4-debian -f Dockerfile.debian .
Extract your new sensu-ruby asset, and get the SHA-512 hash for your
Sensu asset!
$ mkdir assets
$ docker run -v "$PWD/assets:/assets" sensu-ruby-runtime:2.4.4-debian cp /assets/sensu-ruby-runtime_2.4.4_debian_linux_amd64.tar.gz /assets/
$ shasum -a 512 assets/sensu-ruby-runtime_2.4.4_debian_linux_amd64.tar.gz
Put that asset somewhere that your Sensu agent can fetch it. Perhaps add it to the Bonsai asset index!
Create an asset resource in Sensu Go.
First, create a configuration file called sensu-ruby-runtime-2.4.4-debian.json
with
the following contents:
{
"type": "Asset",
"api_version": "core/v2",
"metadata": {
"name": "sensu-ruby-runtime-2.4.4-debian",
"namespace": "default",
"labels": {},
"annotations": {}
},
"spec": {
"url": "http://your-asset-server-here/assets/sensu-ruby-runtime-2.4.4-debian.tar.gz",
"sha512": "4f926bf4328fbad2b9cac873d117f771914f4b837c9c85584c38ccf55a3ef3c2e8d154812246e5dda4a87450576b2c58ad9ab40c9e2edc31b288d066b195b21b",
"filters": [
"entity.system.os == 'linux'",
"entity.system.arch == 'amd64'",
"entity.system.platform == 'debian'"
]
}
}
Then create the asset via:
$ sensuctl create -f sensu-ruby-runtime-2.4.4-debian.json
Create a second asset containing a Ruby script.
To run a simple test using the Ruby runtime asset, create another asset
called helloworld-v0.1.tar.gz
with a simple ruby script at
bin/helloworld.rb
; e.g.:
#!/usr/bin/env ruby
require "date"
puts "Hello world! The time is now #{Time.now()}"
NOTE: this is a simple "hello world" example, but it shows that we have
support for basic stlib gems!
Compress this file into a g-zipped tarball and register this asset with
Sensu, and then you're all ready to run some tests!
Create a check resource in Sensu 2.0.
First, create a configuration file called helloworld.json
with
the following contents:
{
"type": "CheckConfig",
"api_version": "core/v2",
"metadata": {
"name": "helloworld",
"namespace": "default",
"labels": {},
"annotations": {}
},
"spec": {
"command": "helloworld.rb",
"runtime_assets": ["sensu-ruby-runtime-2.4.4-debian", "helloworld-v0.1"],
"publish": true,
"interval": 10,
"subscriptions": ["docker"]
}
}
Then create the asset via:
$ sensuctl create -f helloworld.json
At this point, the sensu-backend
should begin publishing your check
request. Any sensu-agent
member of the "docker" subscription should
receive the request, fetch the Ruby runtime and helloworld assets,
unpack them, and successfully execute the helloworld.rb
command by
resolving the Ruby shebang (#!/usr/bin/env ruby
) to the Ruby runtime
on the Sensu agent $PATH
.:wq
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