Created
March 3, 2016 22:43
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update-juju-unit-hostnames.py
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#!/usr/bin/env python | |
""" | |
This script will update all the juju units using | |
the hostname defined on the provided dns server | |
Usage: | |
{0} ip-of-maas-dns-server | |
""" | |
import subprocess | |
import yaml | |
import sys | |
def juju_status(juju_env=None): | |
cmd = ['juju', 'status'] | |
if juju_env: | |
cmd.append(['-e', juju_env]) | |
status_raw = subprocess.check_output(cmd) | |
return yaml.safe_load(status_raw) | |
def dig(ip_addr, dns_server): | |
return subprocess.check_output(["dig", "-x", ip_addr, "@"+dns_server, "+short"])[0:-1] | |
def juju_run(unit, command): | |
return subprocess.check_call(["juju", "run", "--unit", unit, command]) | |
def set_hostname_to_dns_name(dns): | |
status = juju_status() | |
for service in status.get('services'): | |
try: | |
service_units = status['services'][service]['units'] | |
for unit, info in service_units.items(): | |
public_addr = info['public-address'] | |
resolved = dig(public_addr, dns) | |
if resolved != "": | |
print "Setting unit:%s hostname to: %s" % (unit, resolved) | |
juju_run(unit, "sudo hostnamectl set-hostname %s && echo '%s %s' >> /etc/hosts" % (resolved, public_addr, resolved)) | |
except KeyError: | |
pass | |
def main(): | |
if not len(sys.argv) > 1: | |
print __doc__.format(sys.argv[0]) | |
sys.exit(-1) | |
set_hostname_to_dns_name(sys.argv[1]) | |
if __name__ == "__main__": | |
main() |
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