openstack-nova源码分析(八）aggregates主机组管理 metadata

深入解析OpenStack Nova中的主机组管理与Metadata操作

最新推荐文章于 2024-11-15 15:08:57 发布

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最新推荐文章于 2024-11-15 15:08:57 发布 · 889 阅读

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文章标签：

#openstack #nova #host #metadata

本文详细介绍了OpenStack Nova中的主机组（aggregates）管理，包括如何通过命令行和URL添加、移除主机，以及如何管理metadata。分析了AggregateController中的关键函数，如add_host_to_aggregate、remove_host_from_aggregate和update_aggregate_metadata的实现，涉及到的日志记录、主机验证、主机组信息更新和调度器刷新等核心步骤。

aggregate 主机管理管理
可以向主机中添加，或者移除一个主机，也可以管理metadata

一. URL 及命令行：

/os-aggregates/{aggregate_id}/action

命令行：

[root@nova ~]# nova help | grep agg
    aggregate-add-host          Add the host to the specified aggregate.
    aggregate-remove-host       Remove the specified host from the specified aggregate.
    aggregate-set-metadata      Update the metadata associated with the aggregate.

二. 源码分析：

aggregate 主机管理功能也是定义在AggregateController 中：
class AggregateController(wsgi.Controller):

添加主机操作：

    @wsgi.action('add_host')
    @validation.schema(aggregates.add_host)
    def _add_host(self, req, id, body):
        """Adds a host to the specified aggregate."""
        host = body['add_host']['host']

        context = _get_context(req)
        context.can(aggr_policies.POLICY_ROOT % 'add_host')
        try:
            aggregate = self.api.add_host_to_aggregate(context, id, host)
        except (exception.AggregateNotFound,
                exception.ComputeHostNotFound) as e:
            raise exc.HTTPNotFound(explanation=e.format_message())
        except (exception.AggregateHostExists,
                exception.InvalidAggregateAction) as e:
            raise exc.HTTPConflict(explanation=e.format_message())
        return self._marshall_aggregate(req, aggregate)

调用add_host_to_aggregate
定义如下：

    def add_host_to_aggregate(self, context, aggregate_id, host_name):
        """Adds the host to an aggregate."""
        aggregate_payload = {'aggregate_id': aggregate_id,
                             'host_name': host_name}
        compute_utils.notify_about_aggregate_update(context,
                                                    "addhost.start",
                                                    aggregate_payload)
        # validates the host; ComputeHostNotFound is raised if in