Rebuild Instance Operation Details-5 minutes a day to play OpenStack (37)

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In the previous section we discussed an important role of snapshot,snapshot as a backup of instance.

If the instance is damaged, it can be restored by snapshot, which is Rebuild.

Rebuild will replace the instance current image file with snapshot, while maintaining the rest of the instance, such as the network, and the resource-allocation attribute unchanged.

Here is the flowchart of Rebuild instance

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1. Send a request to NOVA-API

2. Nova-api sending messages

3. Nova-compute Performing actions

Let's discuss each step in detail below.

send a request to Nova-api

The customer (can be an OpenStack end user, or other program) sends a request to the API (NOVA-API): "Rebuild this Instance"

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Select the image to use for recovery

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View Log/opt/stack/logs/n-api.log

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Nova-api sending Messages

Nova-api sent a message to Messaging (RabbitMQ): "Rebuild this Instance" source code in/opt/stack/nova/nova/compute/api.py, method is Rebuild.

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Nova-compute Performing Actions

View Log/opt/stack/logs/n-cpu.log

Close Instance

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download the new image and prepare the instance image file

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Start Instance

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after Rebuild, the GUI shows that instance has used the new image

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The above is the analysis of Rebuild operation, the next section we discuss the Shelve operation.

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Rebuild Instance Operation Details-5 minutes a day to play OpenStack (37)