One of the most critical parts of OpenStack is the database. Usually, MySQL is used when there is no special configuration to prepare specifically for OpenStack to run smoothly and satisfy its multiple services. On the other hand, it becomes tough to maintain the MySQL databases when the cloud environment keeps growing. Database inconsistency constitutes one of the biggest challenges when running OpenStack in production. For example, it could happen that you have disassociated a network from an instance but the status in the database has not been changed. Nova claims that the network is associated within the instance, while Neutron claims the opposite. In this case, you will have to edit the database and change the start manually. In rare cases, manual intervention can be error-prone. Generally, it is much more difficult to keep consistency when other changes are being performed...
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