openstack中彻底删除计算节点

在使用openstack的过程中，我们经常会添加好几台计算节点来部署虚拟机，在后续使用中由于某些原因，一些计算节点出现了问题，需要将这些出了问题的计算节点从openstack的控制节点中踢出去！但是很多时候，在删除计算节点的时候由于删除不彻底而导致了后面使用openstack出现了诸多问题

下面记录了在openstack中彻底删除计算节点compute2的操作：
在控制节点上操作
查看计算节点

[root@controller ~]# openstack host list
Missing value auth-url required for auth plugin password
[root@controller ~]# source /openstcak/
admin-openrc  cloud/        
[root@controller ~]# source /openstcak/admin-openrc 
[root@controller ~]# openstack host list
+------------+-------------+----------+
| Host Name  | Service     | Zone     |
+------------+-------------+----------+
| controller | conductor   | internal |
| controller | scheduler   | internal |
| controller | consoleauth | internal |
| compute1   | compute     | nova     |
| compute2   | compute     | nova     |
+------------+-------------+----------+
[root@controller ~]# nova service-list
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host       | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | controller | internal | enabled | up    | 2021-10-15T02:28:41.000000 | -               |
| 5  | nova-scheduler   | controller | internal | enabled | up    | 2021-10-15T02:28:38.000000 | -               |
| 6  | nova-consoleauth | controller | internal | enabled | up    | 2021-10-15T02:28:42.000000 | -               |
| 12 | nova-compute     | compute1   | nova     | enabled | up    | 2021-10-15T02:28:37.000000 | -               |
| 13 | nova-compute     | compute2   | nova     | enabled | down  | 2021-10-13T07:20:01.000000 | -               |
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+

虽然上面显示的一个计算节点compute2 的State状态是down，但是Status状态还是enabled可用
现在需要使它为不可用

[root@controller ~]# nova service-disable compute2 nova-compute 
+----------+--------------+----------+
| Host     | Binary       | Status   |
+----------+--------------+----------+
| compute2 | nova-compute | disabled |
+----------+--------------+----------+
[root@controller ~]# nova service-list
+----+------------------+------------+----------+----------+-------+----------------------------+-----------------+
| Id | Binary           | Host       | Zone     | Status   | State | Updated_at                 | Disabled Reason |
+----+------------------+------------+----------+----------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | controller | internal | enabled  | up    | 2021-10-15T02:55:22.000000 | -               |
| 5  | nova-scheduler   | controller | internal | enabled  | up    | 2021-10-15T02:55:19.000000 | -               |
| 6  | nova-consoleauth | controller | internal | enabled  | up    | 2021-10-15T02:55:22.000000 | -               |
| 12 | nova-compute     | compute1   | nova     | enabled  | up    | 2021-10-15T02:55:17.000000 | -               |
| 13 | nova-compute     | compute2   | nova     | disabled | down  | 2021-10-15T02:55:11.000000 | -               |
+----+------------------+------------+----------+----------+-------+----------------------------+-----------------+

在数据库里清理（nova库）

[root@controller ~]# mysql
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 101949
Server version: 10.1.20-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> use nova;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
MariaDB [nova]> delete from nova.services where host="compute2";
Query OK, 1 row affected (0.04 sec)

MariaDB [nova]> delete from compute_nodes where hypervisor_hostname="compute2";
Query OK, 1 row affected (0.04 sec)

MariaDB [nova]> select host from nova.services;
+------------+
| host       |
+------------+
| 0.0.0.0    |
| 0.0.0.0    |
| compute1   |
| controller |
| controller |
| controller |
+------------+
6 rows in set (0.00 sec)

MariaDB [nova]> select hypervisor_hostname from compute_nodes;
+---------------------+
| hypervisor_hostname |
+---------------------+
| compute1            |
+---------------------+
1 row in set (0.00 sec)

MariaDB [nova]> ^DBye

再次查看计算节点，就发现已经删除了compute2

[root@controller ~]# openstack host list
+------------+-------------+----------+
| Host Name  | Service     | Zone     |
+------------+-------------+----------+
| controller | conductor   | internal |
| controller | scheduler   | internal |
| controller | consoleauth | internal |
| compute1   | compute     | nova     |
+------------+-------------+----------+
[root@controller ~]# nova service-list
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host       | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | controller | internal | enabled | up    | 2021-10-15T02:59:03.000000 | -               |
| 5  | nova-scheduler   | controller | internal | enabled | up    | 2021-10-15T02:58:59.000000 | -               |
| 6  | nova-consoleauth | controller | internal | enabled | up    | 2021-10-15T02:59:02.000000 | -               |
| 12 | nova-compute     | compute1   | nova     | enabled | up    | 2021-10-15T02:58:57.000000 | -               |
+----+------------------+------------+----------+---------+-------+----------------------------+-----------------+