1. 之前 Ubuntu 20.04 手动安装OpenStack只做到了 Networking service Installation Guide 这一步，然后就不继续了，以为最困难的都过去了

2. 今天临时想要创建一个虚拟机，发现从命令行方式和 DashBoard 创建虚拟机，都报错了！

   Host ‘compute2’ is not mapped to any cell

3. 从 DashBoard 查看错误原因
   

4. 分析：前面其他错误修改后，没有重新同步发现 compute 节点
   所以直接重新来过

   root@controller:/home/dhbm# nova-manage cell_v2 discover_hosts --verbose

    Found 2 cell mappings.
    Skipping cell0 since it does not contain hosts.
    Getting computes from cell 'cell1': acff5521-7a28-4a1d-bf04-6354dc5884eb
    Checking host mapping for compute host 'compute2': 0186d682-fbda-4c55-a6b4-950fa35ca6e2
    Creating host mapping for compute host 'compute2': 0186d682-fbda-4c55-a6b4-950fa35ca6e2
    Found 1 unmapped computes in cell: acff5521-7a28-4a1d-bf04-6354dc5884eb
   

   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    | 2022-12-06T06:26:07.000000 |
    | 13 | nova-compute | compute2   | nova | enabled | up    | 2022-12-06T06:26:10.000000 |
    +----+--------------+------------+------+---------+-------+----------------------------+
   

   再次创建虚拟机，就 OK了！

   

后记

保险起见，以上修改调整后，一定重启一下对应服务

service nova-api restart
service nova-scheduler restart
service nova-conductor restart
service nova-novncproxy restart

HTTP 服务也要重启

systemctl restart apache2

比如：我这里直接继续创建虚拟机，就报错了

消息
Build of instance aec7299c-8928-44a3-a486-5d2521869bf3 aborted: The request you have made requires authentication. (HTTP 401) (Request-ID: req-9adf4910-4225-494d-9179-0e03317fc513)