DNS HA
Implement DNS high availability. Pass the correct information to hacluster to register a DNS entry with MAAS 2.0 or greater rather than using a virtual IP. Charm-helpers sync to bring in DNS HA helpers Change-Id: I2d9e2b92b0ebf33dc2f62327df6edbfd1e81dcca
This commit is contained in:
David Ames
parent
dd9f4e7b71
commit
7f3cfab538
36
README.md
36
README.md
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@ -49,17 +49,37 @@ deployment:
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A minimium cluster size of three units is recommended.
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In order to access the cluster, use the hacluster charm to provide a single IP
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address:
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juju set percona-cluster vip=10.0.3.200
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juju deploy hacluster
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juju add-relation hacluster percona-cluster
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HA/Clustering
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-------------
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Clients can then access using the vip provided. This vip will be passed to
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related services:
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There are two mutually exclusive high availability options: using virtual
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IP(s) or DNS. In both cases, a relationship to hacluster is required which
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provides the corosync back end HA functionality.
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juju add-relation keystone percona-cluster
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To use virtual IP(s) the clustered nodes must be on the same subnet such that
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the VIP is a valid IP on the subnet for one of the node's interfaces and each
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node has an interface in said subnet. The VIP becomes a highly-available API
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endpoint.
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At a minimum, the config option 'vip' must be set in order to use virtual IP
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HA. If multiple networks are being used, a VIP should be provided for each
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network, separated by spaces. Optionally, vip_iface or vip_cidr may be
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specified.
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To use DNS high availability there are several prerequisites. However, DNS HA
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does not require the clustered nodes to be on the same subnet.
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Currently the DNS HA feature is only available for MAAS 2.0 or greater
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environments. MAAS 2.0 requires Juju 2.0 or greater. The clustered nodes must
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have static or "reserved" IP addresses registered in MAAS. The DNS hostname(s)
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must be pre-registered in MAAS before use with DNS HA.
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At a minimum, the config option 'dns-ha' must be set to true and
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'os-access-hostname' must be set in order to use DNS HA.
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The charm will throw an exception in the following circumstances:
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If neither 'vip' nor 'dns-ha' is set and the charm is related to hacluster
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If both 'vip' and 'dns-ha' are set as they are mutually exclusive
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If 'dns-ha' is set and os-access-hostname is not set
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Network Space support
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---------------------
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@ -6,6 +6,8 @@ include:
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- fetch
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- contrib.hahelpers.cluster
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- contrib.openstack.utils
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- contrib.openstack.ip
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- contrib.openstack.ha.utils
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- contrib.openstack.exceptions
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- contrib.storage.linux
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- contrib.python.packages
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@ -0,0 +1,111 @@
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# 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.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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settings = ['os-admin-hostname', 'os-internal-hostname',
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'os-public-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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@ -0,0 +1,182 @@
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# Copyright 2014-2015 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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from charmhelpers.core.hookenv import (
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config,
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unit_get,
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service_name,
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network_get_primary_address,
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)
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from charmhelpers.contrib.network.ip import (
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get_address_in_network,
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is_address_in_network,
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is_ipv6,
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get_ipv6_addr,
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resolve_network_cidr,
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)
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from charmhelpers.contrib.hahelpers.cluster import is_clustered
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PUBLIC = 'public'
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INTERNAL = 'int'
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ADMIN = 'admin'
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ADDRESS_MAP = {
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PUBLIC: {
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'binding': 'public',
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'config': 'os-public-network',
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'fallback': 'public-address',
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'override': 'os-public-hostname',
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},
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INTERNAL: {
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'binding': 'internal',
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'config': 'os-internal-network',
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'fallback': 'private-address',
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'override': 'os-internal-hostname',
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},
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ADMIN: {
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'binding': 'admin',
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'config': 'os-admin-network',
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'fallback': 'private-address',
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'override': 'os-admin-hostname',
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}
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}
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def canonical_url(configs, endpoint_type=PUBLIC):
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"""Returns the correct HTTP URL to this host given the state of HTTPS
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configuration, hacluster and charm configuration.
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:param configs: OSTemplateRenderer config templating object to inspect
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for a complete https context.
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:param endpoint_type: str endpoint type to resolve.
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:param returns: str base URL for services on the current service unit.
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"""
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scheme = _get_scheme(configs)
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address = resolve_address(endpoint_type)
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if is_ipv6(address):
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address = "[{}]".format(address)
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return '%s://%s' % (scheme, address)
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def _get_scheme(configs):
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"""Returns the scheme to use for the url (either http or https)
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depending upon whether https is in the configs value.
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:param configs: OSTemplateRenderer config templating object to inspect
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for a complete https context.
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:returns: either 'http' or 'https' depending on whether https is
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configured within the configs context.
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"""
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scheme = 'http'
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if configs and 'https' in configs.complete_contexts():
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scheme = 'https'
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return scheme
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def _get_address_override(endpoint_type=PUBLIC):
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"""Returns any address overrides that the user has defined based on the
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endpoint type.
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Note: this function allows for the service name to be inserted into the
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address if the user specifies {service_name}.somehost.org.
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:param endpoint_type: the type of endpoint to retrieve the override
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value for.
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:returns: any endpoint address or hostname that the user has overridden
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or None if an override is not present.
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"""
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override_key = ADDRESS_MAP[endpoint_type]['override']
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addr_override = config(override_key)
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if not addr_override:
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return None
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else:
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return addr_override.format(service_name=service_name())
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def resolve_address(endpoint_type=PUBLIC, override=True):
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"""Return unit address depending on net config.
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If unit is clustered with vip(s) and has net splits defined, return vip on
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correct network. If clustered with no nets defined, return primary vip.
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If not clustered, return unit address ensuring address is on configured net
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split if one is configured, or a Juju 2.0 extra-binding has been used.
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:param endpoint_type: Network endpoing type
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:param override: Accept hostname overrides or not
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"""
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resolved_address = None
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if override:
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resolved_address = _get_address_override(endpoint_type)
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if resolved_address:
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return resolved_address
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vips = config('vip')
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if vips:
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vips = vips.split()
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net_type = ADDRESS_MAP[endpoint_type]['config']
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net_addr = config(net_type)
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net_fallback = ADDRESS_MAP[endpoint_type]['fallback']
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binding = ADDRESS_MAP[endpoint_type]['binding']
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clustered = is_clustered()
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if clustered and vips:
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if net_addr:
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for vip in vips:
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if is_address_in_network(net_addr, vip):
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resolved_address = vip
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break
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else:
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# NOTE: endeavour to check vips against network space
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# bindings
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try:
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bound_cidr = resolve_network_cidr(
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network_get_primary_address(binding)
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)
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for vip in vips:
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if is_address_in_network(bound_cidr, vip):
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resolved_address = vip
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break
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except NotImplementedError:
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# If no net-splits configured and no support for extra
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# bindings/network spaces so we expect a single vip
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resolved_address = vips[0]
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else:
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if config('prefer-ipv6'):
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fallback_addr = get_ipv6_addr(exc_list=vips)[0]
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else:
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fallback_addr = unit_get(net_fallback)
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if net_addr:
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resolved_address = get_address_in_network(net_addr, fallback_addr)
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else:
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# NOTE: only try to use extra bindings if legacy network
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# configuration is not in use
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try:
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resolved_address = network_get_primary_address(binding)
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except NotImplementedError:
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resolved_address = fallback_addr
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if resolved_address is None:
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raise ValueError("Unable to resolve a suitable IP address based on "
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"charm state and configuration. (net_type=%s, "
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"clustered=%s)" % (net_type, clustered))
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return resolved_address
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11
config.yaml
11
config.yaml
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@ -79,6 +79,12 @@ options:
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Minimum number of units expected to exist before charm will attempt to
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bootstrap percona cluster. If no value is provided this setting is
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ignored.
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dns-ha:
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type: boolean
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default: False
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description: |
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Use DNS HA with MAAS 2.0. Note if this is set do not set vip
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settings below.
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vip:
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type: string
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default:
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@ -114,6 +120,11 @@ options:
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The IP address and netmask of the 'access' network (e.g., 192.168.0.0/24)
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.
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This network will be used for access to database services.
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os-access-hostname:
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type: string
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default:
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description: |
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The hostname or address of the access endpoint for percona-cluster.
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prefer-ipv6:
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type: boolean
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default: False
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|
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@ -25,6 +25,7 @@ from charmhelpers.core.hookenv import (
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WARNING,
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is_leader,
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network_get_primary_address,
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charm_name,
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)
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from charmhelpers.core.host import (
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service_restart,
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@ -52,6 +53,7 @@ from charmhelpers.contrib.hahelpers.cluster import (
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oldest_peer,
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DC_RESOURCE_NAME,
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peer_units,
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get_hacluster_config,
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)
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from charmhelpers.payload.execd import execd_preinstall
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from charmhelpers.contrib.network.ip import (
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@ -68,6 +70,9 @@ from charmhelpers.contrib.hardening.mysql.checks import run_mysql_checks
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from charmhelpers.contrib.openstack.utils import (
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is_unit_paused_set,
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)
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from charmhelpers.contrib.openstack.ha.utils import (
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update_dns_ha_resource_params,
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)
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from percona_utils import (
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determine_packages,
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@ -586,46 +591,55 @@ def shared_db_changed(relation_id=None, unit=None):
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@hooks.hook('ha-relation-joined')
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def ha_relation_joined():
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vip = config('vip')
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vip_iface = get_iface_for_address(vip) or config('vip_iface')
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vip_cidr = get_netmask_for_address(vip) or config('vip_cidr')
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corosync_bindiface = config('ha-bindiface')
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corosync_mcastport = config('ha-mcastport')
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if None in [vip, vip_cidr, vip_iface]:
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log('Insufficient VIP information to configure cluster')
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sys.exit(1)
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if config('prefer-ipv6'):
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res_mysql_vip = 'ocf:heartbeat:IPv6addr'
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vip_params = 'params ipv6addr="%s" cidr_netmask="%s" nic="%s"' % \
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(vip, vip_cidr, vip_iface)
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else:
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res_mysql_vip = 'ocf:heartbeat:IPaddr2'
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vip_params = 'params ip="%s" cidr_netmask="%s" nic="%s"' % \
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(vip, vip_cidr, vip_iface)
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resources = {'res_mysql_vip': res_mysql_vip,
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'res_mysql_monitor': 'ocf:percona:mysql_monitor'}
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def ha_relation_joined(relation_id=None):
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cluster_config = get_hacluster_config()
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sstpsswd = config('sst-password')
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resource_params = {'res_mysql_vip': vip_params,
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'res_mysql_monitor':
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resources = {'res_mysql_monitor': 'ocf:percona:mysql_monitor'}
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resource_params = {'res_mysql_monitor':
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RES_MONITOR_PARAMS % {'sstpass': sstpsswd}}
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groups = {'grp_percona_cluster': 'res_mysql_vip'}
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if config('dns-ha'):
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update_dns_ha_resource_params(relation_id=relation_id,
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resources=resources,
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resource_params=resource_params)
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group_name = 'grp_{}_hostnames'.format(charm_name())
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groups = {group_name: 'res_{}_access_hostname'.format(charm_name())}
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else:
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vip_iface = (get_iface_for_address(cluster_config['vip']) or
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config('vip_iface'))
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vip_cidr = (get_netmask_for_address(cluster_config['vip']) or
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config('vip_cidr'))
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if config('prefer-ipv6'):
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res_mysql_vip = 'ocf:heartbeat:IPv6addr'
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vip_params = 'params ipv6addr="%s" cidr_netmask="%s" nic="%s"' % \
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(cluster_config['vip'], vip_cidr, vip_iface)
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else:
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res_mysql_vip = 'ocf:heartbeat:IPaddr2'
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vip_params = 'params ip="%s" cidr_netmask="%s" nic="%s"' % \
|
||||
(cluster_config['vip'], vip_cidr, vip_iface)
|
||||
|
||||
resources['res_mysql_vip'] = res_mysql_vip
|
||||
|
||||
resource_params['res_mysql_vip'] = vip_params
|
||||
|
||||
group_name = 'grp_percona_cluster'
|
||||
groups = {group_name: 'res_mysql_vip'}
|
||||
|
||||
clones = {'cl_mysql_monitor': 'res_mysql_monitor meta interleave=true'}
|
||||
|
||||
colocations = {'vip_mysqld': 'inf: grp_percona_cluster cl_mysql_monitor'}
|
||||
colocations = {'colo_percona_cluster': 'inf: {} cl_mysql_monitor'
|
||||
''.format(group_name)}
|
||||
|
||||
locations = {'loc_percona_cluster':
|
||||
'grp_percona_cluster rule inf: writable eq 1'}
|
||||
'{} rule inf: writable eq 1'
|
||||
''.format(group_name)}
|
||||
|
||||
for rel_id in relation_ids('ha'):
|
||||
relation_set(relation_id=rel_id,
|
||||
corosync_bindiface=corosync_bindiface,
|
||||
corosync_mcastport=corosync_mcastport,
|
||||
corosync_bindiface=cluster_config['ha-bindiface'],
|
||||
corosync_mcastport=cluster_config['ha-mcastport'],
|
||||
resources=resources,
|
||||
resource_params=resource_params,
|
||||
groups=groups,
|
||||
|
|
|
|||
|
|
@ -28,7 +28,9 @@ TO_PATCH = ['log', 'config',
|
|||
'unit_get',
|
||||
'get_host_ip',
|
||||
'is_clustered',
|
||||
'get_ipv6_addr']
|
||||
'get_ipv6_addr',
|
||||
'get_hacluster_config',
|
||||
'update_dns_ha_resource_params']
|
||||
|
||||
|
||||
class TestHARelation(CharmTestCase):
|
||||
|
|
@ -36,18 +38,6 @@ class TestHARelation(CharmTestCase):
|
|||
CharmTestCase.setUp(self, hooks, TO_PATCH)
|
||||
self.network_get_primary_address.side_effect = NotImplementedError
|
||||
|
||||
@mock.patch('sys.exit')
|
||||
def test_relation_not_configured(self, exit_):
|
||||
self.config.return_value = None
|
||||
|
||||
class MyError(Exception):
|
||||
pass
|
||||
|
||||
def f(x):
|
||||
raise MyError(x)
|
||||
exit_.side_effect = f
|
||||
self.assertRaises(MyError, hooks.ha_relation_joined)
|
||||
|
||||
def test_resources(self):
|
||||
self.relation_ids.return_value = ['ha:1']
|
||||
password = 'ubuntu'
|
||||
|
|
@ -59,6 +49,11 @@ class TestHARelation(CharmTestCase):
|
|||
self.get_iface_for_address.return_value = None
|
||||
self.test_config.set('vip', '10.0.3.3')
|
||||
self.test_config.set('sst-password', password)
|
||||
self.get_hacluster_config.return_value = {
|
||||
'vip': '10.0.3.3',
|
||||
'ha-bindiface': 'eth0',
|
||||
'ha-mcastport': 5490,
|
||||
}
|
||||
|
||||
def f(k):
|
||||
return self.test_config.get(k)
|
||||
|
|
@ -77,7 +72,7 @@ class TestHARelation(CharmTestCase):
|
|||
|
||||
clones = {'cl_mysql_monitor': 'res_mysql_monitor meta interleave=true'}
|
||||
|
||||
colocations = {'vip_mysqld': 'inf: grp_percona_cluster cl_mysql_monitor'} # noqa
|
||||
colocations = {'colo_percona_cluster': 'inf: grp_percona_cluster cl_mysql_monitor'} # noqa
|
||||
|
||||
locations = {'loc_percona_cluster':
|
||||
'grp_percona_cluster rule inf: writable eq 1'}
|
||||
|
|
@ -101,6 +96,11 @@ class TestHARelation(CharmTestCase):
|
|||
self.test_config.set('vip', '10.0.3.3')
|
||||
self.test_config.set('vip_cidr', '16')
|
||||
self.test_config.set('vip_iface', 'eth0')
|
||||
self.get_hacluster_config.return_value = {
|
||||
'vip': '10.0.3.3',
|
||||
'ha-bindiface': 'eth0',
|
||||
'ha-mcastport': 5490,
|
||||
}
|
||||
|
||||
def f(k):
|
||||
return self.test_config.get(k)
|
||||
|
|
@ -130,6 +130,11 @@ class TestHARelation(CharmTestCase):
|
|||
self.test_config.set('vip', '10.0.3.3')
|
||||
self.test_config.set('vip_cidr', '16')
|
||||
self.test_config.set('vip_iface', 'eth1')
|
||||
self.get_hacluster_config.return_value = {
|
||||
'vip': '10.0.3.3',
|
||||
'ha-bindiface': 'eth1',
|
||||
'ha-mcastport': 5490,
|
||||
}
|
||||
|
||||
def f(k):
|
||||
return self.test_config.get(k)
|
||||
|
|
|
|||
Loading…
Reference in New Issue