131 lines
4.1 KiB
Python
131 lines
4.1 KiB
Python
# Copyright 2014-2016 Canonical Limited.
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#
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# This file is part of charm-helpers.
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#
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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#
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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#
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# Copyright 2016 Canonical Ltd.
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#
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# Authors:
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# Openstack Charmers <
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#
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"""
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Helpers for high availability.
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"""
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import re
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from charmhelpers.core.hookenv import (
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log,
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relation_set,
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charm_name,
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config,
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status_set,
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DEBUG,
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)
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from charmhelpers.core.host import (
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lsb_release
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)
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from charmhelpers.contrib.openstack.ip import (
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resolve_address,
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)
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class DNSHAException(Exception):
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"""Raised when an error occurs setting up DNS HA
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"""
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pass
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def update_dns_ha_resource_params(resources, resource_params,
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relation_id=None,
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crm_ocf='ocf:maas:dns'):
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""" Check for os-*-hostname settings and update resource dictionaries for
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the HA relation.
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@param resources: Pointer to dictionary of resources.
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Usually instantiated in ha_joined().
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@param resource_params: Pointer to dictionary of resource parameters.
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Usually instantiated in ha_joined()
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@param relation_id: Relation ID of the ha relation
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@param crm_ocf: Corosync Open Cluster Framework resource agent to use for
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DNS HA
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"""
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# Validate the charm environment for DNS HA
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assert_charm_supports_dns_ha()
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settings = ['os-admin-hostname', 'os-internal-hostname',
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'os-public-hostname', 'os-access-hostname']
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# Check which DNS settings are set and update dictionaries
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hostname_group = []
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for setting in settings:
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hostname = config(setting)
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if hostname is None:
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log('DNS HA: Hostname setting {} is None. Ignoring.'
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''.format(setting),
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DEBUG)
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continue
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m = re.search('os-(.+?)-hostname', setting)
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if m:
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networkspace = m.group(1)
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else:
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msg = ('Unexpected DNS hostname setting: {}. '
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'Cannot determine network space name'
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''.format(setting))
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status_set('blocked', msg)
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raise DNSHAException(msg)
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hostname_key = 'res_{}_{}_hostname'.format(charm_name(), networkspace)
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if hostname_key in hostname_group:
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log('DNS HA: Resource {}: {} already exists in '
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'hostname group - skipping'.format(hostname_key, hostname),
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DEBUG)
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continue
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hostname_group.append(hostname_key)
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resources[hostname_key] = crm_ocf
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resource_params[hostname_key] = (
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'params fqdn="{}" ip_address="{}" '
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''.format(hostname, resolve_address(endpoint_type=networkspace,
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override=False)))
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if len(hostname_group) >= 1:
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log('DNS HA: Hostname group is set with {} as members. '
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'Informing the ha relation'.format(' '.join(hostname_group)),
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DEBUG)
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relation_set(relation_id=relation_id, groups={
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'grp_{}_hostnames'.format(charm_name()): ' '.join(hostname_group)})
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else:
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msg = 'DNS HA: Hostname group has no members.'
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status_set('blocked', msg)
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raise DNSHAException(msg)
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def assert_charm_supports_dns_ha():
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"""Validate prerequisites for DNS HA
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The MAAS client is only available on Xenial or greater
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"""
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if lsb_release().get('DISTRIB_RELEASE') < '16.04':
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msg = ('DNS HA is only supported on 16.04 and greater '
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'versions of Ubuntu.')
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status_set('blocked', msg)
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raise DNSHAException(msg)
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return True
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