The openstack project is provided under the apache 2. The software platform consists of interrelated components that control diverse. The new expandcontract workflow will not utilize any migration scripts, instead it will dynamically compare the running schema against the database model defined in nova. The nova conductor service is the only service that writes to the database. Certain options may be reloaded by sending sighup to the correct process. The final major tenet in nova s upgrade strategy is decoupling the actual database schema changes from the process of upgrading the nodes that access that schema directly i. Openstack uses a database to store data for all openstack services such. If you want to configure additional compute nodes, prepare them in a similar fashion to the first compute node in the example architectures section. The other compute services access the database through the nova conductor service to ensure that the database schema is current, run the following command. The flavor indicates various characteristics of the instance, such as ram, root volume size, and so on. Openstack nova essex mysql database schema diagram and. Stores current version of the database schema as well as other migrationrelated info. This command should be called after upgrading database schema and nova.
In nova, instances, users, groups, and networks are tracked using a relational database that you can query to get information. Returns exit code 0 if the database schema was synced successfully, or 1 if. When you create a database instance, you must specify a nova flavor. Introduction to openstack simple talk redgate software. Clustering mysql backend in openstack severalnines. As mentioned in the release notes of the mitaka release version.
Openstack nova essex mysql database schema diagram and sql. The ironic compute driver will do this online and as necessary if run normally. The attached documents describe the database schema including the relationships between the tables, the available indexes and primary keys, and the identifiers tracked by the database. This specification discusses the issue of database schema migrations which may proceed while allowing both the previous and the updated version of the neutron database api to run against that schema at the same time. It was initially forked from the nova baremetal driver and has evolved into a. Understanding nova nova seeks to provide a framework for the largescale. To ensure that the database schema is current, run the following command. The most common is through a software package called libvirt. Hence, in case of upgrade failure, restoring database from backup is the only choice. Unless required by applicable law or agreed to in writing, software. The api servers process rest requests, which typically involve database reads writes, optionally sending rpc messages to other nova. Each additional compute node requires a unique ip address.
In the default section, enable only the compute and metadata apis. This section assumes that you are following the instructions in this guide stepbystep to configure the first compute node. Openstack is a free open standard cloud computing platform, mostly deployed as infrastructureasaservice iaas in both public and private clouds where virtual servers and other resources are made available to users. If a date range is desired for the purge, then run novamanage db. Im in the process of setting up an openstack essex installation on a. Currently nova has 2 types of database upgrades that are in use. Ddl statements will be generated, and optionally executed, to make the running schema match the model.
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