07.计算Nova→3.场景学习→4.Start Instance

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背景：

描述	详细
向 nova-api 发送请求 客户（可以是 OpenStack 最终用户，也可以是其他程序）向API（nova-api）发送请求：“帮我启动这个 Instance” 查看n-api的日志。	1 2 3 4 5 6 Jun 18 15:06:00 controller devstack@n-api.service[14704]: DEBUG nova.compute.api [None admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] {{(pid=14738) 1
nova-api 发送消息 nova-api 向 Messaging（RabbitMQ）发送了一条消息：“启动这个 Instance”。查看源代码 /opt/stack/nova/nova/compute/api.py 的 2281 行，方法是 start。 self.compute_rpcapi.start_instance() 的作用就是向 RabbitMQ 上 nova-compute 的消息队列里发送一条 start instance 的消息。
nova-compute 执行操作： 查看计算节点上n-cpu的日志	开始启动 1 2 3 4 5 6 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] network_info=[{"profile": {}, {{(pid=5685) _get_guest_xml /opt/stack/nova/nova/virt/libvirt/driver. 1 2 3 4 5 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] xml=<domain type="kvm"> 准备 instance 镜像文件 1 2 3 4 5 6 7 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG oslo_concurrency.processutils [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] CMD "/usr/bin/python -m oslo_concurrency.prlimit --as=1073741824 -... ... {{(pid=5685) execute /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:409 1 2 3 4 5 6 7 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG oslo_concurrency.processutils [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] CMD "/usr/bin/python -m oslo_concurrency.prlimit --as=1073741824 --cpu=30 -- env LC_ALL=C LANG=C --force-share" returned: 0 in 0.036s {{(pid=5685) execute /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:409 准备虚拟网卡 1 2 3 4 5 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] vif_type=bridge instance=Instance(access_ip_v4=None,access_ip_v6=None,architecture=Non... {{(pid=5685) plug /opt/stack/nova/nova/virt/libvirt/vif.py:785 1 2 3 Jun 18 15:06:01 compute nova-compute[5685]: INFO os_vif [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] vif是virtual interface(虚拟网卡)的缩写 成功启动 1 2 3 4 5 Jun 18 15:06:02 compute nova-compute[5685]: INFO nova.compute.manager [None req-55b92b99-57ee-4f39-a9dd-63dc885efbb9 None None] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] resume rɪ'zjum （使）重新开始;（使）继续进行 1 2 3 4 Jun 18 15:06:02 compute nova-compute[5685]: INFO nova.virt.libvirt.driver [-] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd]