Nagios/Icinga check script for Dropwizard Healthchecks

check_dropwizard_health.py

#!/usr/bin/env python3

# Check dropwizard health check page.
# Reports the number of healthy services.

# The only parameter is the url to the healthcheck page. i.e. https://host/service/metrics/healthcheck

# for use in icinga2, define a CheckCommand:
#
# object CheckCommand "dropwizard_health" {
#	  import "plugin-check-command"
#	  command = [ SysconfDir + "/icinga2/scripts/check_dropwizard_health.py", "$url$" ]
# }
#
# and a Service:
#
# object Service "<appname>_health" {
#  import "generic-service"
#  check_command = "dropwizard_health"
#  display_name = "<Application> Health"
#  host_name = "hostname"
#  vars.url = "http://application-host/metrics/healthcheck"
# }

import os
import sys
import requests

url = sys.argv[1]

count = 0
healthy = 0

r = requests.get(url)
if r.status_code == 200:
    s = r.json()
    for part, state in s.items():
        count = count + 1
        if state['healthy'] == True:
            healthy = healthy + 1

msg = str(healthy) + " of " + str(count) + " services are healthy."
state = "UNKNOWN"
unhealthy = count - healthy

if healthy == count:
    state = "OK"
    exit = 0
else:
    state = "WARNING"
    exit = 1

print ("HEALTH " + state + ": " + msg + " |healthy=" + str(healthy) + ";" + str(unhealthy) + ";0;" + str(count))
sys.exit(exit)