07.计算Nova→3.场景学习→2.Launch→2.nova-scheduler

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为什么nova不像cinder一样是工作流的形式???



描述详细
  1. 日志显示初始有两个 host（在我们的实验环境中就是controller和compute），依次经过若干filter 的过滤，两个计算节点都通过了。
    1. 过滤器补充：
      1. DifferentHostFilter：allows the instance on a different host from a set of instances.选择与一组虚拟机不同位置的主机
      2. SameHostFilter：puts the instance on the same host as another instance in a set of instances选择与一组虚拟机相同位置的主机
    2. 过滤器位置\\opt\\stack\\nova\\nova\\scheduler\\filters</li>
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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Starting with 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:70


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.scheduler.filters.retry_filter 

[None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Re-scheduling is disabled 

(pid=25303) host_passes /opt/stack/nova/nova/scheduler/filters/retry_filter.py:38


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.scheduler.filters.retry_filter 

[None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Re-scheduling is disabled 

(pid=25303) host_passes /opt/stack/nova/nova/scheduler/filters/retry_filter.py:38


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter RetryFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter AvailabilityZoneFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter ComputeFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter ComputeCapabilitiesFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter ImagePropertiesFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter ServerGroupAntiAffinityFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter ServerGroupAffinityFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter SameHostFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.filters [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filter DifferentHostFilter returned 2 host(s) 

(pid=25303) get_filtered_objects /opt/stack/nova/nova/filters.py:104

  1. 接下来就该 weight 了，可以看到controller和compute内存一致，因此比较磁盘得到结果：controller(1.95...)的权重小于compute(2)，最终选择compute
    1. 要显示 DEBUG 日志，需要在 /etc/nova/nova.conf 中打开 debug 选项
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      [DEFAULT]
      
debug = True
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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.scheduler.filter_scheduler [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Filtered [

(compute, compute) ram: 7471MB disk: 41984MB io_ops: 0 instances: 0, 

(controller, controller) ram: 7471MB disk: 39936MB io_ops: 0 instances: 0] 

(pid=25303) _get_sorted_hosts /opt/stack/nova/nova/scheduler/filter_scheduler.py:404


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Jun 16 13:12:50 controller nova-scheduler[25303]: 

DEBUG nova.scheduler.filter_scheduler [None req-d9a23179-e16d-4016-9586-e68c3dfdf6a9 admin admin] 

Weighed [WeighedHost

[host: (compute, compute) ram: 7471MB disk: 41984MB io_ops: 0 instances: 0, weight: 2.0],

WeighedHost

[host: (controller, controller) ram: 7471MB disk: 39936MB io_ops: 0 instances: 0, weight: 1.9512195122]] 

(pid=25303) _get_sorted_hosts /opt/stack/nova/nova/scheduler/filter_scheduler.py:423

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