No valid host was found. There are not enough hosts available-----openstack建虚拟机直

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No valid host was found. There are not enough hosts available-----openstack建虚拟机直接报错
7 x$ Z2 p! P5 g! }0 H5 f2 P" Y一、问题现象：
二、解决思路：
. Y% S0 G  D: ^% P/ @7 E* {8 \9 x1、查看计算节点的nova-compute 日志,发现如下日志：
2、查看nova-scheduler.log
3、进数据查看数据库表
# v( \: n. S! z( I: j, |0 M+ @4、尝试将compute节点从nova service-list中删除，并重新加入到集群中
' n7 u, m  P" @" O- `* f& P5、再次进入数据库，执行 select * from resource_providers;
' z( ~: w' O5 n/ N7 {5 x6、查找官网，找到了操作 resource_providers的openstack命令,执行如下操作。
一、问题现象：
, h- o% M; N- L. T本次环境中只有一个计算节点，创建虚拟机直接报错，使用nova show 看到报错如下图：
) N% C3 \5 Z* ?5 s) C"message": "No valid host was found. There are not enough hosts available.", "code": 500
; a1 h, T& F1 F- _$ I5 o* X
  {: }1 L5 }# F+ [' t二、解决思路：
9 O0 a7 r/ E1 ^1、查看计算节点的nova-compute 日志,发现如下日志：
2019-11-21 19:47:09.484 8 ERROR nova.scheduler.client.report [req-cbc37e88-16be-4b5b-be98-d889cd1b01dc - - - - -] [req-a5a6d438-3f63-49aa-9dd2-98d061b122b4] Failed to create resource provider record in placement API for UUID d878a164-6499-43d4-9772-b77107a1bb8c. Got 409: {"errors": [
{"status": 409, "request_id": "req-a5a6d438-3f63-49aa-9dd2-98d061b122b4", "detail": "There was a conflict when trying to complete your request.\n\n Conflicting resource provider name: compute1 already exists. ", "title": "Conflict"}
+ V8 s" z6 n. ^" g2019-11-21 19:47:09.485 8 ERROR nova.compute.manager [req-cbc37e88-16be-4b5b-be98-d889cd1b01dc - - - - -] Error updating resources for node compute1.: ResourceProviderCreationFailed: Failed to create resource provider compute1
. n6 T& O6 T" J7 I发现ResourceProviderCreationFailed: Failed to create resource provider compute1 ，发现resource Provider 创建失败。怀疑数据库resource provider 表没有建出来，继续查看nova-nova-scheduler.log。
" [9 y4 T* i& I: R5 l% m2、查看nova-scheduler.log
2019-11-21 20:18:43.360 29 INFO nova.filters [req-448bd5fa-ddc8-45d9-9b8b-a63bdb691335 e0111848d3904a7288df61cac5163f4f 9be97009f556459cb1814232dbedb4a3 - default default] Filter RetryFilter returned 0 hosts
2019-11-21 20:18:43.362 29 INFO nova.filters [req-448bd5fa-ddc8-45d9-9b8b-a63bdb691335 e0111848d3904a7288df61cac5163f4f 9be97009f556459cb1814232dbedb4a3 - default default] Filtering removed all hosts for the request with instance ID 'c9542c1c-191e-49f2-815a-fdcacc081af6'. Filter results: ['RetryFilter: (start: 0, end: 0)']
: g: h9 v5 S$ t. A. k) [3、进数据查看数据库表
3 u" a5 q# I2 w8 K/ D. H* B5 Z9 Kmysql> use nova_api;
2 o; O( t7 Z! u% Q5 zmysql[nova_api] >  select * from resource_providers;
' E6 L# V& g* @% v- ^6 i; y) k+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
| created_at          | updated_at          | id | uuid                                 | name     | generation | can_host | root_provider_id | parent_provider_id |
& s, D3 a2 v0 [0 U; H+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
| 2019-11-21 06:17:39 | 2019-11-21 06:17:41 |  3 | 16d1bd53-7919-4fef-9a11-a0e98c149823 | compute1 |          1 |     NULL |                3 |               NULL |
( o, c2 D; C, {* b+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
: K" L' m1 r; J! I0 j9 \1 row in set (0.00 sec)
发现有数据。重新创建虚拟机，依然会发生报错，
# X8 z  `+ m. X, k! _' ~* O4、尝试将compute节点从nova service-list中删除，并重新加入到集群中
0 |+ K/ a5 x3 T5 k+ k% d# 停掉compute节点的nova-compute 服务
nova service-delete <计算节点的uuid>
# 开启计算节点的nova-compute服务，让计算节点重新注册
尝试创建虚拟机，发现还是报错。返回去，查看nova-compute的日志发现 There was a conflict when trying to complete your request.\n\n Conflicting resource provider name: compute1 already exists. 。提示矛盾。
5、再次进入数据库，执行 select * from resource_providers;
mysql> use nova_api;
mysql[nova_api] >  select * from resource_providers;
- c6 R$ q% t) i- f0 `$ {+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
( ?& }: Y  F4 I2 T/ U' b| created_at          | updated_at          | id | uuid                                 | name     | generation | can_host | root_provider_id | parent_provider_id |
+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
| 2019-11-21 06:17:39 | 2019-11-21 06:17:41 |  3 | 16d1bd53-7919-4fef-9a11-a0e98c149823 | compute1 |          1 |     NULL |                3 |               NULL |
+---------------------+---------------------+----+--------------------------------------+----------+------------+----------+------------------+--------------------+
* T# X2 m- Q0 W1 S) P1 row in set (0.00 sec)
发现新注册的计算节点，但是resource_providers的uuid 没有发生变化，怀疑是注册compute节点的时候，并没有更新resource_providers，尝试删除resource_providers;
7 X& T4 q8 d# e6 u) a! Y+ \
+ P+ T1 Q! `( `+ h  Y7 I

查找官网，找到了操作 resource_providers的openstack命令,执行如下操作。
相关文档：https://docs.openstack.org/osc-placement/latest/cli/index.html
相关软件包：https://cbs.centos.org/kojifiles/packages/python-osc-placement/1.3.0/1.el7/noarch/python2-osc-placement-1.3.0-1.el7.noarch.rpm
9 I8 F$ t. g" O6 O! p; X6 R4 o# q# 安装osc-placement 软件包，生成命令行工具
# 执行如下命令：
% r6 D* K4 y9 J) M6 Iexport OS_PLACEMENT_API_VERSION=1.10
openstack allocation candidate list --resource VCPU=1
2 n& e/ \' F) ^- s" O4 V6 f# 查看当前resource provider
[root@control1 ~]# openstack resource provider  list
; X( h0 D% i  I2 a/ a' g, n  D) W* |+--------------------------------------+----------+------------+
% @) h* w% n* C9 s* O1 w| uuid                                 | name     | generation |
+--------------------------------------+----------+------------+
| 16d1bd53-7919-4fef-9a11-a0e98c149823 | compute1 |          2 |
6 \/ ^) F; D, g: n& w3 J+--------------------------------------+----------+------------+
# 停止计算节点nova-compute服务
) x$ W1 w' M; H# 从service 中删除compute1
% Z* w0 I: X; n( s" W: b  u5 Dnova service-delete  <uuid>
) f  P% O% F9 V# 删除当前resource provider
openstack resource provider  delete 16d1bd53-7919-4fef-9a11-a0e98c149823
" k0 c' X9 A+ l1 ^/ q/ o# 重启nova-compute服务，让其自动注册
2 }+ o/ c5 K, `7 _; E8 U1 ~0 E7 _# 查看当前resource provider
) D" H, u; w. m[root@control1 ~]# openstack resource provider  list
# ]4 U6 k# E5 |, H1 U  O5 K+--------------------------------------+----------+------------+
| uuid                                 | name     | generation |
" X" R& ^) y- E- C9 g+ l) V+--------------------------------------+----------+------------+
| b32cd7b5-26c6-4998-97f1-79fa2315871b | compute1 |          2 |
+--------------------------------------+----------+------------+
# # 执行如下命令，验证是否更新了数据
0 k8 ]0 d1 p$ n; }export OS_PLACEMENT_API_VERSION=1.10
openstack allocation candidate list --resource VCPU=1
, \8 [; U, ]" N1 ~执行创建云主机，云主机成功创建。