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: Icc9bfb16e07ca6cf5475182b1974b09949cd89b6
This commit is contained in:
David Ames
James Page
parent
74e10c82d4
commit
3a2adbf106
46
README.md
46
README.md
@ -58,27 +58,41 @@ have already deployed Ceph using the ceph charm:
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This configuration can also be used to support Glance in HA/Scale-out
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deployments.
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Glance HA/Scale-out
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HA/Clustering
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===================
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The Glance charm can also be used in a HA/scale-out configuration using
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the hacluster charm:
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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 deploy -n 3 glance
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juju deploy hacluster haglance
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juju set glance vip=<virtual IP address to access glance over>
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juju add-relation glance haglance
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juju add-relation glance mysql
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juju add-relation glance keystone
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juju add-relation glance nova-cloud-controller
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juju add-relation glance ceph|swift-proxy
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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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In this configuration, 3 service units host the Glance image service;
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API requests are load balanced across all 3 service units via the
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configured virtual IP address (which is also registered into Keystone
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as the endpoint for Glance).
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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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Note that Glance in this configuration must be used with either Ceph or
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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 at least one
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of 'os-public-hostname', 'os-internal-hostname' or 'os-internal-hostname' must
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be set in order to use DNS HA. One or more of the above hostnames may be set.
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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 none of the os-{admin,internal,public}-hostname(s) are
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set
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Note that Glance in HA configuration must be used with either Ceph or
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Swift providing backing image storage.
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Glance metering
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@ -280,14 +280,14 @@ def get_hacluster_config(exclude_keys=None):
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for initiating a relation to hacluster:
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ha-bindiface, ha-mcastport, vip, os-internal-hostname,
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os-admin-hostname, os-public-hostname
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os-admin-hostname, os-public-hostname, os-access-hostname
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param: exclude_keys: list of setting key(s) to be excluded.
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returns: dict: A dict containing settings keyed by setting name.
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raises: HAIncompleteConfig if settings are missing or incorrect.
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'''
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settings = ['ha-bindiface', 'ha-mcastport', 'vip', 'os-internal-hostname',
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'os-admin-hostname', 'os-public-hostname']
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'os-admin-hostname', 'os-public-hostname', 'os-access-hostname']
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conf = {}
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for setting in settings:
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if exclude_keys and setting in exclude_keys:
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@ -324,7 +324,7 @@ def valid_hacluster_config():
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# If dns-ha then one of os-*-hostname must be set
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if dns:
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dns_settings = ['os-internal-hostname', 'os-admin-hostname',
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'os-public-hostname']
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'os-public-hostname', 'os-access-hostname']
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# At this point it is unknown if one or all of the possible
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# network spaces are in HA. Validate at least one is set which is
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# the minimum required.
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@ -36,6 +36,10 @@ from charmhelpers.core.hookenv import (
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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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@ -63,8 +67,11 @@ def update_dns_ha_resource_params(resources, resource_params,
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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']
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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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@ -109,3 +116,15 @@ def update_dns_ha_resource_params(resources, resource_params,
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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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@ -725,15 +725,14 @@ def git_install_requested():
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requirements_dir = None
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def git_default_repos(projects_yaml):
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def git_default_repos(projects):
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"""
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Returns default repos if a default openstack-origin-git value is specified.
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"""
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service = service_name()
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core_project = service
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for default, branch in GIT_DEFAULT_BRANCHES.iteritems():
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if projects_yaml == default:
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if projects == default:
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# add the requirements repo first
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repo = {
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@ -743,41 +742,34 @@ def git_default_repos(projects_yaml):
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}
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repos = [repo]
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# neutron-* and nova-* charms require some additional repos
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if service in ['neutron-api', 'neutron-gateway',
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'neutron-openvswitch']:
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core_project = 'neutron'
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for project in ['neutron-fwaas', 'neutron-lbaas',
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'neutron-vpnaas']:
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# neutron and nova charms require some additional repos
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if service == 'neutron':
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for svc in ['neutron-fwaas', 'neutron-lbaas', 'neutron-vpnaas']:
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repo = {
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'name': project,
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'repository': GIT_DEFAULT_REPOS[project],
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'name': svc,
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'repository': GIT_DEFAULT_REPOS[svc],
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'branch': branch,
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}
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repos.append(repo)
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elif service in ['nova-cloud-controller', 'nova-compute']:
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core_project = 'nova'
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elif service == 'nova':
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repo = {
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'name': 'neutron',
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'repository': GIT_DEFAULT_REPOS['neutron'],
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'branch': branch,
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}
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repos.append(repo)
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elif service == 'openstack-dashboard':
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core_project = 'horizon'
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# finally add the current service's core project repo
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# finally add the current service's repo
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repo = {
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'name': core_project,
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'repository': GIT_DEFAULT_REPOS[core_project],
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'name': service,
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'repository': GIT_DEFAULT_REPOS[service],
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'branch': branch,
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}
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repos.append(repo)
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return yaml.dump(dict(repositories=repos))
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return projects_yaml
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return projects
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def _git_yaml_load(projects_yaml):
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30
config.yaml
30
config.yaml
@ -112,6 +112,12 @@ options:
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effect (although it can be changed in ceph by manually configuring
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your ceph cluster).
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# HA configuration settings
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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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@ -232,6 +238,30 @@ options:
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create a public endpoint for glance of:
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.
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https://glance.example.com:9292/
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os-internal-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 internal endpoints created for glance
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in the keystone identity provider.
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.
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This value will be used for internal endpoints. For example, an
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os-internal-hostname set to 'glance.internal.example.com' with ssl enabled will
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create a internal endpoint for glance of:
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.
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https://glance.internal.example.com:9292/
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os-admin-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 admin endpoints created for glance
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in the keystone identity provider.
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.
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This value will be used for admin endpoints. For example, an
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os-admin-hostname set to 'glance.admin.example.com' with ssl enabled will
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create a admin endpoint for glance of:
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.
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https://glance.admin.example.com:9292/
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prefer-ipv6:
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type: boolean
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default: False
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@ -60,6 +60,9 @@ from charmhelpers.contrib.hahelpers.cluster import (
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is_elected_leader,
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get_hacluster_config
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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 charmhelpers.contrib.openstack.utils import (
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config_value_changed,
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configure_installation_source,
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@ -437,6 +440,11 @@ def ha_relation_joined(relation_id=None):
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'res_glance_haproxy': 'op monitor interval="5s"'
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}
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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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else:
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vip_group = []
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for vip in cluster_config['vip'].split():
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if is_ipv6(vip):
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@ -55,6 +55,8 @@ TO_PATCH = [
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'configure_installation_source',
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'os_release',
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'openstack_upgrade_available',
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# charmhelpers.contrib.openstack.ha.utils
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'update_dns_ha_resource_params',
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# charmhelpers.contrib.hahelpers.cluster_utils
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'is_elected_leader',
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# hooks.glance_utils
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@ -765,6 +767,41 @@ class GlanceRelationTests(CharmTestCase):
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}
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self.relation_set.assert_called_with(**args)
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def test_ha_joined_dns_ha(self):
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def _fake_update(resources, resource_params, relation_id=None):
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resources.update({'res_glance_public_hostname': 'ocf:maas:dns'})
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resource_params.update({'res_glance_public_hostname':
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'params fqdn="keystone.maas" '
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'ip_address="10.0.0.1"'})
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self.test_config.set('dns-ha', True)
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self.get_hacluster_config.return_value = {
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'vip': None,
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'ha-bindiface': 'em0',
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'ha-mcastport': '8080',
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'os-admin-hostname': None,
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'os-internal-hostname': None,
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'os-public-hostname': 'keystone.maas',
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}
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args = {
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'relation_id': None,
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'corosync_bindiface': 'em0',
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'corosync_mcastport': '8080',
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'init_services': {'res_glance_haproxy': 'haproxy'},
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'resources': {'res_glance_public_hostname': 'ocf:maas:dns',
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'res_glance_haproxy': 'lsb:haproxy'},
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'resource_params': {
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'res_glance_public_hostname': 'params fqdn="keystone.maas" '
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'ip_address="10.0.0.1"',
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'res_glance_haproxy': 'op monitor interval="5s"'},
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'clones': {'cl_glance_haproxy': 'res_glance_haproxy'}
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}
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self.update_dns_ha_resource_params.side_effect = _fake_update
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relations.ha_relation_joined()
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self.assertTrue(self.update_dns_ha_resource_params.called)
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self.relation_set.assert_called_with(**args)
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def test_ha_relation_changed_not_clustered(self):
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self.relation_get.return_value = False
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relations.ha_relation_changed()
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