07.計算Nova→3.場景學習→4.Start Instance

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背景：

描述	詳細
向 nova-api 發送請求 客戶（能夠是 OpenStack 最終用戶，也能夠是其餘程序）向API（nova-api）發送請求：「幫我啓動這個 Instance」 查看n-api的日誌。	1 2 3 4 5 6 Jun 18 15:06:00 controller devstack@n-api.service[14704]: DEBUG nova.compute.api [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] Going to try to start instance {{(pid=14738) start /opt/stack/nova/nova/compute/api.py:2281
nova-api 發送消息 nova-api 向 Messaging（RabbitMQ）發送了一條消息：「啓動這個 Instance」。查看源代碼 /opt/stack/nova/nova/compute/api.py 的 2281 行，方法是 start。 self.compute_rpcapi.start_instance() 的做用就是向 RabbitMQ 上 nova-compute 的消息隊列裏發送一條 start instance 的消息。
nova-compute 執行操做： 查看計算節點上n-cpu的日誌	開始啓動 1 2 3 4 5 6 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG nova.virt.libvirt.driver [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] Start _get_guest_xml 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 nova.virt.libvirt.driver [None req-b7d17888-d21d-40c5-a918-e20d02929215 admin admin] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] End _get_guest_xml xml=<domain type="kvm"> 準備 instance 鏡像文件 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 -... qemu-img info /opt/stack/data/nova/instances/0af39618-5d8c-4fc8-bb44-781246bff6dd/disk ... {{(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 qemu-img info /opt/stack/data/nova/instances/_base/f8d0b66bcf04fa163b812946b8b5e0c8af9722c2 --force-share" returned: 0 in 0.036s {{(pid=5685) execute /usr/local/lib/python2.7/dist-packages/oslo_concurrency/processutils.py:409 準備虛擬網卡 1 2 3 4 5 Jun 18 15:06:01 compute nova-compute[5685]: DEBUG nova.virt.libvirt.vif [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] Successfully plugged vif VIFBridge vif是virtual interface(虛擬網卡)的縮寫 成功啓動 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] VM Resumed (Lifecycle Event) resume rɪ'zjum （使）從新開始;（使）繼續進行 1 2 3 4 Jun 18 15:06:02 compute nova-compute[5685]: INFO nova.virt.libvirt.driver [-] [instance: 0af39618-5d8c-4fc8-bb44-781246bff6dd] Instance rebooted successfully.