This "juju nuke" plugin will not only destroy-service, it will also destroy-machine --force all machines running units of that service. Normally, juju does not reuse machines when destroying and redeploying services. This is useful when you're debugging on an OpenStack or AWS and tired of leaking instances when redeploying. This script is called…

juju-nuke

#!/usr/bin/env python

import json
import os
import sys
from subprocess import Popen, PIPE


def die(msg):
	print >>sys.stderr, msg
	os._exit(1)


if __name__ == '__main__':
	p = Popen(["juju", "status", "--format", "json"], stdin=None, stdout=PIPE, stderr=PIPE)
	out, err = p.communicate()

	if p.returncode:
		die("Failed to execute 'juju status': %s" % (err))

	data = json.loads(out)

	match_services = set(sys.argv[1:])
	if not match_services:
		die("Usage: %s <service1> [<service2> .. <serviceN>]" % (sys.argv[0]))

	nuke_machines = set()
	nuke_services = set()

	for service_name, service_info in data.get('services', {}).iteritems():
		if service_name in match_services:
			nuke_services.add(service_name)
			for unit_name, unit_info in service_info.get('units', {}).iteritems():
				if unit_info.get('machine'):
					nuke_machines.add(unit_info['machine'])

	for m in nuke_machines:
		p = Popen(["juju", "destroy-machine", "--force", m], stdin=None, stdout=PIPE, stderr=PIPE)
		out, err = p.communicate()
		if p.returncode:
			print >>sys.stderr, "Failed to destroy-machine %s: %s" % (m, err)
	for s in nuke_services:
		p = Popen(["juju", "destroy-service", s], stdin=None, stdout=PIPE, stderr=PIPE)
		out, err = p.communicate()
		if p.returncode:
			print >>sys.stderr, "Failed to destroy-service %s: %s" % (s, err)

	print "Destroyed machines: %s" % (', '.join(sorted(list(nuke_machines))))
	print "Destroyed services: %s" % (', '.join(sorted(list(nuke_services))))