145 lines
5.6 KiB
Markdown
145 lines
5.6 KiB
Markdown
Overview
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--------
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This charm provides the Glance image service for OpenStack. It is intended to
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be used alongside the other OpenStack components.
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Usage
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-----
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Glance may be deployed in a number of ways. This charm focuses on 3 main
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configurations. All require the existence of the other core OpenStack
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services deployed via Juju charms, specifically: mysql, keystone and
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nova-cloud-controller. The following assumes these services have already
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been deployed.
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Local Storage
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=============
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In this configuration, Glance uses the local storage available on the server
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to store image data:
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juju deploy glance
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juju add-relation glance keystone
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juju add-relation glance mysql
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juju add-relation glance nova-cloud-controller
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Swift backed storage
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====================
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Glance can also use Swift Object storage for image storage. Swift is often
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deployed as part of an OpenStack cloud and provides increased resilience and
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scale when compared to using local disk storage. This configuration assumes
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that you have already deployed Swift using the swift-proxy and swift-storage
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charms:
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juju deploy glance
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juju add-relation glance keystone
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juju add-relation glance mysql
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juju add-relation glance nova-cloud-controller
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juju add-relation glance swift-proxy
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This configuration can be used to support Glance in HA/Scale-out deployments.
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Ceph backed storage
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===================
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In this configuration, Glance uses Ceph based object storage to provide
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scalable, resilient storage of images. This configuration assumes that you
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have already deployed Ceph using the ceph charm:
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juju deploy glance
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juju add-relation glance keystone
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juju add-relation glance mysql
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juju add-relation glance nova-cloud-controller
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juju add-relation glance ceph
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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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NOTE: Glance acts as a Ceph client in this case which requires IP (L3)
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connectivity to ceph monitors and OSDs. For MAAS-based deployments this
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can be addressed with network spaces (see the relevant section below).
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HA/Clustering
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===================
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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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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 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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===============
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In order to do Glance metering with Ceilometer, an AMQP relation is required
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e.g.
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juju deploy glance
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juju deploy rabbitmq-server
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juju deploy ceilometer-agent
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...
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juju add-relation glance rabbitmq-server
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juju add-relation glance ceilometer-agent
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...
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Network Space support
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---------------------
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This charm supports the use of Juju Network Spaces, allowing the charm to be bound to network space configurations managed directly by Juju. This is only supported with Juju 2.0 and above.
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API endpoints can be bound to distinct network spaces supporting the network separation of public, internal and admin endpoints.
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Glance acts as a Ceph client and needs IP connectivity to Ceph monitors and OSDs. Binding the ceph endpoint to a space can solve this problem in case monitors and OSDs are located on a single L2 broadcast domain (if they are not, static or dynamic routes need to be used in addition to spaces).
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Access to the underlying MySQL instance can also be bound to a specific space using the shared-db relation.
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To use this feature, use the --bind option when deploying the charm:
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juju deploy glance --bind "public=public-space internal=internal-space admin=admin-space shared-db=internal-spacec ceph=ceph-access-space"
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Alternatively, these can also be provided as part of a juju native bundle configuration:
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glance:
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charm: cs:xenial/glance
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num_units: 1
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bindings:
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public: public-space
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admin: admin-space
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internal: internal-space
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shared-db: internal-space
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ceph: ceph-access-space
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NOTE: Spaces must be configured in the underlying provider prior to attempting to use them.
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NOTE: Existing deployments using os-*-network configuration options will continue to function; these options are preferred over any network space binding provided if set.
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