Start Instance Operation Details-5 minutes a day to play OpenStack (31)

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This section analyzes the instance start operation in detail through a log file.

Here is the flowchart for start 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 (which can be an OpenStack end-user or other program) sends a request to the API (NOVA-API): "Start this Instance for me"

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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): "Start this Instance" to view the 2002 lines of source code/opt/stack/nova/nova/compute/api.py by start.

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The function of Self.compute_rpcapi.start_instance () is to send a start instance message to the Nova-compute message queue on RabbitMQ.

Nova-compute Performing Actions

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

start Start

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preparing the Virtual network card

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preparing the XML file for instance

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preparing the instance image file

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successfully started

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The Start operation analysis is here, and the next section continues to discuss other Nova operations.

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Start Instance Operation Details-5 minutes a day to play OpenStack (31)