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#! /usr/bin/env ruby
#
# check-container
#
# DESCRIPTION:
# This is a simple check script for Sensu to check that a Docker container is
# running. You can pass in either a container id or a container name.
#
# OUTPUT:
# plain text
#
# PLATFORMS:
# Linux
#
# DEPENDENCIES:
# gem: sensu-plugin
#
# USAGE:
# check-container.rb -H /var/run/docker.sock -N c92d402a5d14
# CheckDockerContainer OK: c92d402a5d14 is running on /var/run/docker.sock.
#
# check-container.rb -H https://127.0.0.1:2376 -N circle_burglar
# CheckDockerContainer CRITICAL: circle_burglar is not running on https://127.0.0.1:2376
#
# NOTES:
# => State.running == true -> OK
# => State.running == false -> CRITICAL
# => Not Found -> CRITICAL
# => Can't connect to Docker -> WARNING
# => Other exception -> WARNING
#
# LICENSE:
# Copyright 2014 Sonian, Inc. and contributors. <support@sensuapp.org>
# Released under the same terms as Sensu (the MIT license); see LICENSE
# for details.
#
require 'sensu-plugin/check/cli'
require 'sensu-plugins-docker/client_helpers'
#
# Check Docker Container
#
class CheckDockerContainer < Sensu::Plugin::Check::CLI
option :docker_host,
short: '-H DOCKER_HOST',
long: '--docker-host DOCKER_HOST',
description: 'Docker API URI. https://host, https://host:port, http://host, http://host:port, host:port, unix:///path'
option :container,
short: '-N CONTAINER',
long: '--container-name CONTAINER',
required: true
option :tag,
short: '-t TAG',
long: '--tag TAG'
option :allowexited,
short: '-x',
long: '--allow-exited',
boolean: true,
description: 'Do not raise alert if container has exited without error'
def run
@client = DockerApi.new(config[:docker_host])
path = "/containers/#{config[:container]}/json"
response = @client.call(path, false)
if response.code.to_i == 404
critical "Container #{config[:container]} is not running on #{@client.uri}"
end
body = parse_json(response)
container_running = body['State']['Running']
if container_running
if config[:tag]
image = body['Config']['Image']
match = image.match(/^(?:([^\/]+)\/)?(?:([^\/]+)\/)?([^@:\/]+)(?:[@:](.+))?$/)
unless match && match[4] == config[:tag]
critical "#{config[:container]}'s tag is '#{match[4]}', especting '#{config[:tag]}'"
end
end
ok "#{config[:container]} is running on #{@client.uri}."
elsif config[:allowexited] && body['State']['Status'] == 'exited'
if (body['State']['ExitCode']).zero?
ok "#{config[:container]} has exited without error on #{@client.uri}."
else
critical "#{config[:container]} has exited with status code #{body['State']['ExitCode']} on #{@client.uri}."
end
else
critical "#{config[:container]} is #{body['State']['Status']} on #{@client.uri}."
end
end
end