07.計算Nova→3.場景學習→2.Launch→2.nova-scheduler

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爲何nova不像cinder同樣是工做流的形式???

描述	詳細
日誌顯示初始有兩個 host（在咱們的實驗環境中就是controller和compute），依次通過若干filter 的過濾，兩個計算節點都經過了。 過濾器補充： DifferentHostFilter：allows the instance on a different host from a set of instances.選擇與一組虛擬機不一樣位置的主機 SameHostFilter：puts the instance on the same host as another instance in a set of instances選擇與一組虛擬機相同位置的主機 過濾器位置\opt\stack\nova\nova\scheduler\filters</li>	1 2 3 4 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 1 2 3 4 5 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 1 2 3 4 5 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 1 2 3 4 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 1 2 3 4 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 1 2 3 4 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 1 2 3 4 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 1 2 3 4 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}} 1 2 3 4 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}} 1 2 3 4 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}} 1 2 3 4 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}} 1 2 3 4 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}}
接下來就該 weight 了，能夠看到controller和compute內存一致，所以比較磁盤獲得結果：controller(1.95...)的權重小於compute(2)，最終選擇compute 要顯示 DEBUG 日誌，須要在 /etc/nova/nova.conf 中打開 debug 選項 1 2 [DEFAULT] debug = True	1 2 3 4 5 6 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}} 1 2 3 4 5 6 7 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}}