OpenStack 删除一个计算节点

思路

增加计算节点大概需要 4 个事情：

1. 加入 package 源 OpenStack packages for Ubuntu
2. 安装时间同步服务 chrony Other nodes reference the controller node for clock synchronization
3. 安装 nova 计算服务 Install and configure a compute node for Ubuntu
4. 安装 Networking service 网络服务 Install and configure compute node

删除（下线）一个计算节点的话，只需要删除 nova 计算服务 和 Networking service 网络服务

操作步骤

1. 删除 nova service
   root@controller:/home/dhbm# nova service-list

    +--------------------------------------+----------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+
    | Id                                   | Binary         | Host       | Zone     | Status  | State | Updated_at                 | Disabled Reason | Forced down |
    +--------------------------------------+----------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+
    | 8108a83f-39a4-41cb-bf66-d13d36acff1b | nova-scheduler | controller | internal | enabled | up    | 2022-11-21T06:14:46.000000 | -               | False       |
    | 77aa7e35-b7df-41f8-a5af-657100b07ea6 | nova-conductor | controller | internal | enabled | up    | 2022-11-21T06:14:46.000000 | -               | False       |
    | 5385e0fd-f5f6-4045-ab31-1a057f7324aa | nova-compute   | controller | nova     | enabled | up    | 2022-11-21T06:14:55.000000 | -               | False       |
    | 5cb981b3-96b5-42f0-b978-3ed6eb51c586 | nova-conductor | compute1   | internal | enabled | down  | -                          | -               | False       |
    | 835a0ee6-b218-4c98-96f1-966d36e1e70a | nova-scheduler | compute1   | internal | enabled | down  | -                          | -               | False       |
    | 0eb6f0a6-42b6-4210-a858-34accd88cb20 | nova-compute   | compute1   | nova     | enabled | down  | 2022-11-21T02:07:01.000000 | -               | False       |
    +--------------------------------------+----------------+------------+----------+---------+-------+----------------------------+-----------------+-------------+
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   删除其中 compute1 相关的 service ID

   root@controller:/home/dhbm# nova service-delete 5cb981b3-96b5-42f0-b978-3ed6eb51c586

   root@controller:/home/dhbm# nova service-delete 835a0ee6-b218-4c98-96f1-966d36e1e70a

   root@controller:/home/dhbm# nova service-delete 0eb6f0a6-42b6-4210-a858-34accd88cb20

   最终结果
   root@controller:/home/dhbm# openstack compute service list --service nova-compute

    +----+--------------+------------+------+---------+-------+----------------------------+
    | ID | Binary       | Host       | Zone | Status  | State | Updated At                 |
    +----+--------------+------------+------+---------+-------+----------------------------+
    |  5 | nova-compute | controller | nova | enabled | up    | 2022-11-21T06:18:25.000000 |
    +----+--------------+------------+------+---------+-------+----------------------------+
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2. 删除 network agent

   root@controller:/home/dhbm# openstack network agent list

    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
    | ID                                   | Agent Type         | Host       | Availability Zone | Alive | State | Binary                    |
    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
    | 326c6f4c-370a-4f06-abfb-6e7fa1bc6c67 | Linux bridge agent | controller | None              | :-)   | UP    | neutron-linuxbridge-agent |
    | 4b594d85-cc54-45b1-8264-2c692827d7ca | Linux bridge agent | compute1   | None              | XXX   | UP    | neutron-linuxbridge-agent |
    | 633c6363-6a63-4ac9-a589-41d28a1508ae | Metadata agent     | controller | None              | :-)   | UP    | neutron-metadata-agent    |
    | 9a8ead8b-2173-44f2-a102-8c1d4b4098da | L3 agent           | controller | nova              | :-)   | UP    | neutron-l3-agent          |
    | fce10fb1-f9a7-4f5e-862b-51955d52b149 | DHCP agent         | controller | nova              | :-)   | UP    | neutron-dhcp-agent        |
    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
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   删除 compute1 对应的 ID
   root@controller:/home/dhbm# openstack network agent delete 4b594d85-cc54-45b1-8264-2c692827d7ca

   最终结果
   root@controller:/home/dhbm# openstack network agent list

    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
    | ID                                   | Agent Type         | Host       | Availability Zone | Alive | State | Binary                    |
    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
    | 326c6f4c-370a-4f06-abfb-6e7fa1bc6c67 | Linux bridge agent | controller | None              | :-)   | UP    | neutron-linuxbridge-agent |
    | 633c6363-6a63-4ac9-a589-41d28a1508ae | Metadata agent     | controller | None              | :-)   | UP    | neutron-metadata-agent    |
    | 9a8ead8b-2173-44f2-a102-8c1d4b4098da | L3 agent           | controller | nova              | :-)   | UP    | neutron-l3-agent          |
    | fce10fb1-f9a7-4f5e-862b-51955d52b149 | DHCP agent         | controller | nova              | :-)   | UP    | neutron-dhcp-agent        |
    +--------------------------------------+--------------------+------------+-------------------+-------+-------+---------------------------+
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