Snapshot Instance Operational Details
Nova the Snapshot backup operation is called, its working principle is the image file instance (system disk) for full backup, it generates a type of image snapshot and save it to the Glance.
Backup and recovery from the operation called Rebuild.
Below is a flow diagram of the snapshot instance
1, sends a request to nova-api
2, nova-api send message
3, nova-compute operations performed
Detailed analysis:
1 , sends a request to nova-api
Customer (end-user can be OpenStack, may also be other programs) sends a request to the API (nova-api): "This Instance to be a snapshot"
2 , Nova-API sends a message
nova-api to send a message to Messaging (RabbitMQ): "do this snapshot Instance". Source code /opt/stack/nova/nova/compute/api.py, is snapshot.
. 3 , performing the operation Compute-Nova
- Pause instance
- For instance do a snapshot image file
- Recovery instance
- Snapshots uploaded to Glance
- Snapshot successfully saved in the Glance
- instance backup success
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https://www.cnblogs.com/CloudMan6/p/5510296.html
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转载于:https://www.cnblogs.com/gsophy/p/11021709.html