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#! /usr/bin/env ruby
#
# check-docker-container
#
# DESCRIPTION:
# This is a simple check script for Sensu to check the number of a Docker Container
#
# OUTPUT:
# plain text
#
# PLATFORMS:
# Linux
#
# DEPENDENCIES:
# gem: sensu-plugin
# gem: net_http_unix
#
# USAGE:
# check-docker-container.rb -w 3 -c 3
# => 1 container running = OK.
# => 4 container running = CRITICAL
#
# check-docker-container.rb -H /var/run/docker.sock -w 3 -c 3
# => 1 container running = OK.
# => 4 container running = CRITICAL
#
# check-docker-container.rb -H https://127.0.0.1:2376 -w 3 -c 3
# => 1 container running = OK.
# => 4 container running = CRITICAL
#
# NOTES:
#
# LICENSE:
# Author Yohei Kawahara <inokara@gmail.com>
# 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 Containers
#
class CheckDockerContainers < Sensu::Plugin::Check::CLI
option :docker_host,
description: 'Docker API URI. https://host, https://host:port, http://host, http://host:port, host:port, unix:///path',
short: '-H DOCKER_HOST',
long: '--docker-host DOCKER_HOST'
option :warn_over,
short: '-W N',
long: '--warn-over N',
description: 'Trigger a warning if over a number',
proc: proc(&:to_i)
option :crit_over,
short: '-C N',
long: '--critical-over N',
description: 'Trigger a critical if over a number',
proc: proc(&:to_i)
option :warn_under,
short: '-w N',
long: '--warn-under N',
description: 'Trigger a warning if under a number',
proc: proc(&:to_i),
default: 1
option :crit_under,
short: '-c N',
long: '--critical-under N',
description: 'Trigger a critical if under a number',
proc: proc(&:to_i),
default: 1
def under_message(crit_under, count)
"Less than #{crit_under} containers running. #{count} running."
end
def over_message(crit_over, count)
"More than #{crit_over} containers running. #{count} running."
end
def evaluate_count(count)
# #YELLOW
if config.key?(:crit_under) && count < config[:crit_under]
critical under_message(config[:crit_under], count)
# #YELLOW
elsif config.key?(:crit_over) && count > config[:crit_over]
critical over_message(config[:crit_over], count)
# #YELLOW
elsif config.key?(:warn_under) && count < config[:warn_under]
warning under_message(config[:warn_under], count)
# #YELLOW
elsif config.key?(:warn_over) && count > config[:warn_over]
warning over_message(config[:warn_over], count)
else
ok
end
end
def run
@client = DockerApi.new(config[:docker_host])
containers = @client.parse('/containers/json')
evaluate_count containers.size
end
end