目录：（可以按w快捷键切换大纲视图）
自动清除镜像缓存
在一台计算节点创建虚拟机，若是第一次在该节点创建次虚拟机，会先将镜像文件复制到该计算节点目录/var/lib/nova/instances/_base。长期下来，该目录会占用比较大的磁盘空间而要清理。
可以通过修改nova的配置文件来自动清理该缓存目录。
对比remove_unused_base_images=True设定前后的不同，即设定前多余镜像不会被自动清除，设定并重启nova-compute服务后，多余的镜像文件会被自动清理，且可以正常生成云主机。
remove_unused_base_images=True设定前：
其中镜像文件be32a717ae7ea3aa039131689864a325fd634c92是没有被使用的镜像文件。
等待一段时间，文件没有变化。
remove_unused_base_images=True设定并重启nova-compute服务后:
image_cache_manager_interval=5，remove_unused_original_minimum_age_seconds=3是为了缩短测试时间作的设定，实际生产环境分别是用默认值40分钟，设定值247小时，现在改成5秒，3秒。就是说不用此缩短测试时间的设定，生产环境是40分钟检查下image cache，超过247小时无用的base镜像才会被删除。
发现很快多余的镜像被自动删除了。
检查/var/log/nova/nova-compute.log，也找到了自动删除多余镜像的log：
2017-02-07 16:01:51.678 14200 INFO nova.virt.libvirt.imagecache [req-ee1a7ad5-a021-4aad-b653-7db14191536e - - - - -] Active base files: /var/lib/nova/instances/_base/0522bc602608d45758d815b01a6899ff3e1e3e27 /var/lib/nova/instances/_base/dc1ed4ad70a573f2acea085b068b61f3cb99e195 /var/lib/nova/instances/_base/be32a717ae7ea3aa039131689864a325fd634c1c
2017-02-07 16:01:51.678 14200 INFO nova.virt.libvirt.imagecache [req-ee1a7ad5-a021-4aad-b653-7db14191536e - - - - -] Removable base files: /var/lib/nova/instances/_base/be32a717ae7ea3aa039131689864a325fd634c92
2017-02-07 16:01:51.679 14200 INFO nova.virt.libvirt.imagecache [req-ee1a7ad5-a021-4aad-b653-7db14191536e - - - - -] Removing base or swap file: /var/lib/nova/instances/_base/be32a717ae7ea3aa039131689864a325fd634c92
has allocations against this compute host but is not found in the database
现象：
创建vm报错
[root@EXTENV-194-18-2-16 nova]# cat nova-compute.log | grep 620cd801-8849-481a-80e0-2980b6c8dba6
2018-08-23 15:23:36.136 3558 INFO nova.compute.resource_tracker [req-f76d5408-00f8-4a67-854e-ad3da2098811 - - - - -] Instance 620cd801-8849-481a-80e0-2980b6c8dba6 has allocations against this compute host but is not found in the database.
解决：
感觉是node的信息数据库不同步
nova show 出错的vm，报cell错误
####每次增加一个计算节点在控制节点需要执行：
# su -s /bin/sh -c "nova-manage cell_v2 discover_hosts --verbose" nova
问题解决。
dashboard neutron报错 Invalid service catalog service: network
现象：
neutron服务是好的，命令行创建网络查看网络正常，就是dashboard不能查看网络相关的页面
dashboard neutron报错 Invalid service catalog service: network
解决：
应该是Keystone没有正常配置。导致没有找到相关的Catalog信息。
[root@EXTENV-194-18-2-11 ~]# openstack catalog list
+-----------+-----------+-----------------------------------------------+
| Name | Type | Endpoints |
+-----------+-----------+-----------------------------------------------+
| placement | placement | RegionOne |
| | | internal: http://nova-ha-vip:8778 |
| | | RegionOne |
| | | admin: http://nova-ha-vip:8778 |
| | | RegionOne |
| | | public: http://nova-ha-vip:8778 |
| | | |
| keystone | identity | RegionOne |
| | | public: http://keystone-ha-vip:5000/v3/ |
| | | RegionOne |
| | | internal: http://keystone-ha-vip:35357/v3/ |
| | | RegionOne |
| | | admin: http://keystone-ha-vip:35357/v3/ |
| | | |
| glance | image | RegionOne |
| | | admin: http://glance-ha-vip:9292 |
| | | RegionOne |
| | | internal: http://glance-ha-vip:9292 |
| | | RegionOne |
| | | public: http://glance-ha-vip:9292 |
| | | |
| nova | compute | RegionOne |
| | | public: http://nova-ha-vip:8774/v2.1 |
| | | RegionOne |
| | | admin: http://nova-ha-vip:8774/v2.1 |
| | | RegionOne |
| | | internal: http://nova-ha-vip:8774/v2.1 |
| | | |
| neutron | network | |
| neutron | network | RegionOne |
| | | public: http://neutron-server-ha-vip:9696 |
| | | RegionOne |
| | | admin: http://neutron-server-ha-vip:9696 |
| | | RegionOne |
| | | internal: http://neutron-server-ha-vip:9696 |
| | | |
+-----------+-----------+-----------------------------------------------+
所以把第一条neutron没有url的数据删掉就好了，但是发现只有openstack catalog list，没有openstack catalog delete命令，后来查看keystone的配置文件keystone.conf发现如下配置
见[catalog]
从配置文件看出catalog是从mysql里面读取的数据，然后从mysql的keystone库中的service表里找到了脏数据，然后知道了用openstack service delete去删除‘脏数据’，问题就解决了。
MariaDB [keystone]> select * from service;
+----------------------------------+-----------+---------+-------------------------------------------------------------+
| id | type | enabled | extra |
+----------------------------------+-----------+---------+-------------------------------------------------------------+
| 520f6bf8564240be9678c4ef25305cad | placement | 1 | {"description": "OpenStack Placement", "name": "placement"} |
| 960580852a594c078e68fe3683e35db5 | identity | 1 | {"name": "keystone"} |
| 98ed18fcd8104732919bb5869a5a6dc2 | image | 1 | {"description": "OpenStack Image", "name": "glance"} |
| abef1b9469d94d3ab9f27c8ed72a5a48 | compute | 1 | {"description": "OpenStack Compute", "name": "nova"} |
| e37085e8fb2a49c0921c2d24f5e4f9b5 | network | 1 | {"description": "OpenStack Networking", "name": "neutron"} |
| f1b661407ce04f79bc24605fa59bb74c | network | 1 | {"description": "OpenStack Networking", "name": "neutron"} |
+----------------------------------+-----------+---------+-------------------------------------------------------------+
6 rows in set (0.00 sec)
MariaDB [keystone]> select * from endpoint;
+----------------------------------+--------------------+-----------+----------------------------------+-----------------------------------+-------+---------+-----------+
| id | legacy_endpoint_id | interface | service_id | url | extra | enabled | region_id |
+----------------------------------+--------------------+-----------+----------------------------------+-----------------------------------+-------+---------+-----------+
| 142cb619cd2242828b0c9394d5baaea1 | NULL | public | f1b661407ce04f79bc24605fa59bb74c | http://neutron-server-ha-vip:9696 | {} | 1 | RegionOne |
| 2252d3ef840b4c5aa1184ebe8d6094f1 | NULL | public | abef1b9469d94d3ab9f27c8ed72a5a48 | http://nova-ha-vip:8774/v2.1 | {} | 1 | RegionOne |
| 476654c6e7dd4d22b290de451e3afda0 | NULL | admin | abef1b9469d94d3ab9f27c8ed72a5a48 | http://nova-ha-vip:8774/v2.1 | {} | 1 | RegionOne |
| 562a5d5443af4dfab6760204d0adf3bf | NULL | internal | 520f6bf8564240be9678c4ef25305cad | http://nova-ha-vip:8778 | {} | 1 | RegionOne |
| 58bd5f09811a4ebcb62a4b51fb7ae444 | NULL | admin | f1b661407ce04f79bc24605fa59bb74c | http://neutron-server-ha-vip:9696 | {} | 1 | RegionOne |
| 600811f8ccaf42669d4d83b897af3933 | NULL | admin | 520f6bf8564240be9678c4ef25305cad | http://nova-ha-vip:8778 | {} | 1 | RegionOne |
| 80683f619efb41dcbb6796ea04f16159 | NULL | internal | f1b661407ce04f79bc24605fa59bb74c | http://neutron-server-ha-vip:9696 | {} | 1 | RegionOne |
| 8e0a684607294a729f87d7d8b1a639ca | NULL | public | 520f6bf8564240be9678c4ef25305cad | http://nova-ha-vip:8778 | {} | 1 | RegionOne |
| 9ef0f18d891e45608ffc41985dc6afa6 | NULL | public | 960580852a594c078e68fe3683e35db5 | http://keystone-ha-vip:5000/v3/ | {} | 1 | RegionOne |
| a0b10cb04a5b4ca3859aaf2ea4ca2a3b | NULL | admin | 98ed18fcd8104732919bb5869a5a6dc2 | http://glance-ha-vip:9292 | {} | 1 | RegionOne |
| c53979becccc44f1813e9f50a619af7e | NULL | internal | 960580852a594c078e68fe3683e35db5 | http://keystone-ha-vip:35357/v3/ | {} | 1 | RegionOne |
| dadbb8dc218245bbba8c9a34237413ec | NULL | internal | 98ed18fcd8104732919bb5869a5a6dc2 | http://glance-ha-vip:9292 | {} | 1 | RegionOne |
| f4034b8c086a451caed52ac51a761fb0 | NULL | public | 98ed18fcd8104732919bb5869a5a6dc2 | http://glance-ha-vip:9292 | {} | 1 | RegionOne |
| fc150884825544baaf4912f14e76f51a | NULL | internal | abef1b9469d94d3ab9f27c8ed72a5a48 | http://nova-ha-vip:8774/v2.1 | {} | 1 | RegionOne |
| fc7132052063438895674fd7b840db68 | NULL | admin | 960580852a594c078e68fe3683e35db5 | http://keystone-ha-vip:35357/v3/ | {} | 1 | RegionOne |
+----------------------------------+--------------------+-----------+----------------------------------+-----------------------------------+-------+---------+-----------+
15 rows in set (0.00 sec)
[root@EXTENV-194-18-2-11 ~]# openstack service list
+----------------------------------+-----------+-----------+
| ID | Name | Type |
+----------------------------------+-----------+-----------+
| 520f6bf8564240be9678c4ef25305cad | placement | placement |
| 960580852a594c078e68fe3683e35db5 | keystone | identity |
| 98ed18fcd8104732919bb5869a5a6dc2 | glance | image |
| abef1b9469d94d3ab9f27c8ed72a5a48 | nova | compute |
| e37085e8fb2a49c0921c2d24f5e4f9b5 | neutron | network |
| f1b661407ce04f79bc24605fa59bb74c | neutron | network |
+----------------------------------+-----------+-----------+
[root@EXTENV-194-18-2-11 ~]# openstack service delete e37085e8fb2a49c0921c2d24f5e4f9b5
[root@EXTENV-194-18-2-11 ~]# systemctl restart httpd.service memcached.service
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