Cinder is a storage service for the Openstack project
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This charm provides the Cinder volume service for OpenStack. It is intended to be used alongside the other OpenStack components, starting with the Folsom release.
Cinder is made up of 3 separate services: an API service, a scheduler and a volume service. This charm allows them to be deployed in different combination, depending on user preference and requirements.
This charm was developed to support deploying Folsom on both Ubuntu Quantal and Ubuntu Precise. Since Cinder is only available for Ubuntu 12.04 via the Ubuntu Cloud Archive, deploying this charm to a Precise machine will by default install Cinder and its dependencies from the Cloud Archive.
Cinder may be deployed in a number of ways. This charm focuses on 3 main configurations. All require the existence of the other core OpenStack services deployed via Juju charms, specifically: mysql, rabbitmq-server, keystone and nova-cloud-controller. The following assumes these services have already been deployed.
Basic, all-in-one using local storage and iSCSI
The api server, scheduler and volume service are all deployed into the same unit. Local storage will be initialized as a LVM phsyical device, and a volume group initialized. Instance volumes will be created locally as logical volumes and exported to instances via iSCSI. This is ideal for small-scale deployments or testing:
cat >cinder.cfg <<END cinder: block-device: sdc overwrite: true END juju deploy --config=cinder.cfg cinder juju add-relation cinder keystone juju add-relation cinder mysql juju add-relation cinder rabbitmq-server juju add-relation cinder nova-cloud-controller
Separate volume units for scale out, using local storage and iSCSI
Separating the volume service from the API service allows the storage pool to easily scale without the added complexity that accompanies load-balancing the API server. When we've exhausted local storage on volume server, we can simply add-unit to expand our capacity. Future requests to allocate volumes will be distributed across the pool of volume servers according to the availability of storage space.
cat >cinder.cfg <<END cinder-api: enabled-services: api, scheduler cinder-volume: enabled-services: volume block-device: sdc overwrite: true END juju deploy --config=cinder.cfg cinder cinder-api juju deploy --config=cinder.cfg cinder cinder-volume juju add-relation cinder-api mysql juju add-relation cinder-api rabbitmq-server juju add-relation cinder-api keystone juju add-relation cinder-api nova-cloud-controller juju add-relation cinder-volume mysql juju add-relation cinder-volume rabbitmq-server # When more storage is needed, simply add more volume servers. juju add-unit cinder-volume
All-in-one using Ceph-backed RBD volumes
All 3 services can be deployed to the same unit, but instead of relying on local storage to back volumes an external Ceph cluster is used. This allows scalability and redundancy needs to be satisified and Cinder's RBD driver used to create, export and connect volumes to instances. This assumes a functioning Ceph cluster has already been deployed using the official Ceph charm and a relation exists between the Ceph service and the nova-compute service.
cat >cinder.cfg <<END cinder: block-device: None END juju deploy --config=cinder.cfg cinder juju add-relation cinder ceph juju add-relation cinder keystone juju add-relation cinder mysql juju add-relation cinder rabbitmq-server juju add-relation cinder nova-cloud-controller
The default value for most config options should work for most deployments.
Users should be aware of three options, in particular:
openstack-origin: Allows Cinder to be installed from a specific apt repository. See config.yaml for a list of supported sources.
block-device: When using local storage, a block device should be specified to back a LVM volume group. It's important this device exists on all nodes that the service may be deployed to.
overwrite: Whether or not to wipe local storage that of data that may prevent it from being initialized as a LVM phsyical device. This includes filesystems and partition tables. CAUTION
enabled-services: Can be used to separate cinder services between service service units (see previous section)
- (int) OpenStack Volume API listening port.
- (string) The block devices on which to create LVM volume group. May also be set to None for deployments that will not need local storage (eg, Ceph/RBD-backed volumes). This can also be a space delimited list of block devices to attempt to use in the cinder LVM volume group - each block device detected will be added to the available physical volumes in the volume group.
- (int) This value dictates the number of replicas ceph must make of any object it stores withing the cinder rbd pool. Of course, this only applies if using Ceph as a backend store. Note that once the cinder rbd pool has been created, changing this value will not have any effect (although it can be changed in ceph by manually configuring your ceph cluster).
- (string) Comma separated list of key=value config flags to be set in cinder.conf.
- (string) Database to request access.
- (string) Username to request database access.
- (boolean) Enable debug logging
- (string) If splitting cinder services between units, define which services to install and configure.
- (int) Newer storage drivers may require the v2 Glance API to perform certain actions e.g. the RBD driver requires requires this to support COW cloning of images. This option will default to v1 for backwards compatibility older glance services.
- (string) Default network interface on which HA cluster will bind to communication with the other members of the HA Cluster.
- (int) Default multicast port number that will be used to communicate between HA Cluster nodes.
- (string) Repository from which to install. May be one of the following: distro (default), ppa:somecustom/ppa, a deb url sources entry, or a supported Cloud Archive release pocket. Supported Cloud Archive sources include: cloud:precise-folsom, cloud:precise-folsom/updates, cloud:precise-folsom/staging, cloud:precise-folsom/proposed. When deploying to Precise, the default distro option will use the cloud:precise-folsom/updates repository instead, since Cinder was not available in the Ubuntu archive for Precise and is only available via the Ubuntu Cloud Archive.
- (string) If true, charm will attempt to overwrite block devices containin previous filesystems or LVM, assuming it is not in use.
- (string) Username to request access on rabbitmq-server.
- (string) RabbitMQ virtual host to request access on rabbitmq-server.
- (string) OpenStack Region
- (string) SSL CA to use with the certificate and key provided - this is only required if you are providing a privately signed ssl_cert and ssl_key.
- (string) SSL certificate to install and use for API ports. Setting this value and ssl_key will enable reverse proxying, point Glance's entry in the Keystone catalog to use https, and override any certficiate and key issued by Keystone (if it is configured to do so).
- (string) SSL key to use with certificate specified as ssl_cert.
- (boolean) By default, all services will log into their corresponding log files. Setting this to True will force all services to log to the syslog.
- (boolean) Enable verbose logging
- (string) Virtual IP to use to front cinder API in ha configuration
- (int) Netmask that will be used for the Virtual IP
- (string) Network Interface where to place the Virtual IP
- (string) Name of volume group to create and store Cinder volumes.