相关blueprints：
https://blueprints.launchpad.net/nova/+spec/mark-host-down
https://blueprints.launchpad.net/python-novaclient/+spec/support-force-down-service
为何要新增该API
有了该API，可以让外部故障监控获得nova-compute服务down的速度更快，这将直接提高VM HA的故障恢复时间（从故障节点疏散VM到正常节点的时间）。
external fault monitoring system a possibility of telling OpenStack Nova fast that compute host is down. This will immediately enable calling of evacuation of any VM on host and further enabling faster HA actions.
REST API for forced down
request: PUT /v2.1/{tenant_id}/os-services/force-down { “binary”: “nova-compute”, “host”: “compute1”, “forced_down”: true }
response: 200 OK { “service”: { “host”: “compute1”, “binary”: “nova-compute”, “forced_down”: true } }
Example: curl -g -i -X PUT http://{service_host_ip}:8774/v2.1/{tenant_id}/os-services /force-down -H “Content-Type: application/json” -H “Accept: application/json ” -H “X-OpenStack-Nova-API-Version: 2.11” -H “X-Auth-Token: {token}” -d ‘{“b inary”: “nova-compute”, “host”: “compute1”, “forced_down”: true}’
CLI for forced down
nova service-force-down
Example: nova service-force-down compute1 nova-compute
REST API for disabling forced down
request: PUT /v2.1/{tenant_id}/os-services/force-down { “binary”: “nova-compute”, “host”: “compute1”, “forced_down”: false }
response: 200 OK { “service”: { “host”: “compute1”, “binary”: “nova-compute”, “forced_down”: false } }
Example: curl -g -i -X PUT http://{service_host_ip}:8774/v2.1/{tenant_id}/os-services /force-down -H “Content-Type: application/json” -H “Accept: application/json ” -H “X-OpenStack-Nova-API-Version: 2.11” -H “X-Auth-Token: {token}” -d ‘{“b inary”: “nova-compute”, “host”: “compute1”, “forced_down”: false}’
CLI for disabling forced down
nova service-force-down –unset
Example: nova service-force-down –unset compute1 nova-compute
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