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 -pEnter password: Welcome to the MariaDB monitor. Commands end with ; or \g.Your MariaDB connection id is 230863Server version: 5.5.50-MariaDB MariaDB ServerCopyright (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 changedMariaDB [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 | - |+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+