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
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[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 | - |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
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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。
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[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 | - |
+----+------------------+-----------------------+----------+----------+-------+----------------------------+-----------------+
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在数据库里清理（nova库）
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[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)
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再次查看计算节点，就发现已经删除了linux-node2.openstack
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[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 | - |
+----+------------------+-----------------------+----------+---------+-------+----------------------------+-----------------+
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