openstack中彻底删除计算节点的操作记录

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linux-node2.openstack的操作：

在控制节点上操作

查看计算节点

[root@linux-node1 src]# openstack host list
+-----------------------+-------------+----------+
| Host Name             | Service     | Zone     |
+-----------------------+-------------+----------+
| linux-node1.openstack | conductor   | internal |
| linux-node1.openstack | cert        | internal |
| linux-node1.openstack | consoleauth | internal |
| linux-node1.openstack | scheduler   | internal |
| linux-node1.openstack | compute     | nova     |
| linux-node2.openstack | compute     | nova     |
+-----------------------+-------------+----------+

[root@linux-node1 src]# nova service-list
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host                  | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:25:08.000000 | -               |
| 4  | nova-cert        | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:25:07.000000 | -               |
| 5  | nova-consoleauth | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:25:07.000000 | -               |
| 6  | nova-scheduler   | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:25:07.000000 | -               |
| 7  | nova-compute     | linux-node1.openstack | nova     | enabled | up    | 2016-11-02T11:24:59.000000 | -               |
| 8  | nova-compute     | linux-node2.openstack | nova     | enabled | down  | 2016-10-31T05:55:24.000000 | -               |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+

虽然上面显示的一个计算节点linux-node2.openstack 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@linux-node1 src]# nova service-disable linux-node2.openstack nova-compute
+-----------------------+--------------+----------+
| Host                  | Binary       | Status   |
+-----------------------+--------------+----------+
| linux-node2.openstack | nova-compute | disabled |
+-----------------------+--------------+----------+
[root@linux-node1 src]# nova service-list
+----+------------------+-----------------------+----------+----------+-------+----------------------------+-----------------+
| Id | Binary           | Host                  | Zone     | Status   | State | Updated_at                 | Disabled Reason |
+----+------------------+-----------------------+----------+----------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | linux-node1.openstack | internal | enabled  | up    | 2016-11-02T11:25:48.000000 | -               |
| 4  | nova-cert        | linux-node1.openstack | internal | enabled  | up    | 2016-11-02T11:25:47.000000 | -               |
| 5  | nova-consoleauth | linux-node1.openstack | internal | enabled  | up    | 2016-11-02T11:25:47.000000 | -               |
| 6  | nova-scheduler   | linux-node1.openstack | internal | enabled  | up    | 2016-11-02T11:25:47.000000 | -               |
| 7  | nova-compute     | linux-node1.openstack | nova     | enabled  | up    | 2016-11-02T11:25:49.000000 | -               |
| 8  | nova-compute     | linux-node2.openstack | nova     | disabled | down  | 2016-11-02T11:25:48.000000 | -               |
+----+------------------+-----------------------+----------+----------+-------+----------------------------+-----------------+

在数据库里清理（nova库）

[root@linux-node1 ~]# mysql -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 230863
Server version: 5.5.50-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;
Database changed
MariaDB [nova]> delete from nova.services where host="linux-node2.openstack";
Query OK, 1 row affected (0.00 sec)
MariaDB [nova]> delete from compute_nodes where hypervisor_hostname="linux-node2.openstack";
Query OK, 1 row affected (0.00 sec)
MariaDB [nova]> select host from nova.services;
+-----------------------+
| host                  |
+-----------------------+
| linux-node1.openstack |
| linux-node1.openstack |
| linux-node1.openstack |
| linux-node1.openstack |
| linux-node1.openstack |
+-----------------------+
5 rows in set (0.00 sec)

MariaDB [nova]> select hypervisor_hostname from compute_nodes;
+-----------------------+
| hypervisor_hostname   |
+-----------------------+
| linux-node1.openstack |
+-----------------------+
1 row in set (0.00 sec)

再次查看计算节点，就发现已经删除了linux-node2.openstack

[root@linux-node1 src]# openstack host list
+-----------------------+-------------+----------+
| Host Name             | Service     | Zone     |
+-----------------------+-------------+----------+
| linux-node1.openstack | conductor   | internal |
| linux-node1.openstack | cert        | internal |
| linux-node1.openstack | consoleauth | internal |
| linux-node1.openstack | scheduler   | internal |
| linux-node1.openstack | compute     | nova     |
+-----------------------+-------------+----------+
[root@linux-node1 src]# nova service-list
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary           | Host                  | Zone     | Status  | State | Updated_at                 | Disabled Reason |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
| 1  | nova-conductor   | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:44:08.000000 | -               |
| 4  | nova-cert        | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:44:08.000000 | -               |
| 5  | nova-consoleauth | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:44:07.000000 | -               |
| 6  | nova-scheduler   | linux-node1.openstack | internal | enabled | up    | 2016-11-02T11:44:07.000000 | -               |
| 7  | nova-compute     | linux-node1.openstack | nova     | enabled | up    | 2016-11-02T11:44:09.000000 | -               |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+