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

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

here is the flowchart for start instance

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"

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

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.

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

preparing the Virtual network card

preparing the XML file for instance

preparing the instance image file

successfully started

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

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