文章目录
说明
- 冷迁移是什么应该不需要我说了吧
- 什么迁移失败的场景可以回退虚拟机？ 你失败后不能正常处理虚拟机，使虚拟机正常开机，都可以使用下面的方法来回退。
- 当然，也不止是迁移失败的场景可以使用该方法，因为其他原因导致虚拟机数据库中的数据异常都可以使用该方法来实现。 简单来说就是，下面的方法就是修改虚拟机数据库的内容的。
虚拟机回退流程
- 我这的回退以迁移失败为例，具体的报错内容可以看下面这篇文章冷迁移报错[错误:error creating snapshot nova-resize form...].处理方法【虽然迁移报错但主机名确实变了且虚拟无法开机】、迁移失败后删除生成的异常快照的流程
同理，该方法也是进入数据库修改任何参数的方法，你只需根据实际场景修改虚拟机的参数即可，我其他博客也有修改虚拟机状态之类的文章。感兴趣的可以翻翻看。
信息核实【计算节点】
- 回退之前，要确定虚拟机在哪个主机上
很简单，virsh list --all看到在哪个主机上，就去数据库中将host和node信息设置为该主机，如我这虚拟机在computer07上
bash
[root@computer07 instances]# virsh list --all
Id Name State
----------------------------------------------------
4 instance-000006a6 running
- instance-000006a9 shut off
[root@computer07 instances]#数据库修改信息流程【控制节点执行】
首先获取nova数据库的密码
控制节点执行：grep mysql /etc/nova/nova.conf ，如下，Changeme_123就是密码
bash
[root@controller01 nova]# grep mysql /etc/nova/nova.conf
connection = mysql+pymysql://nova:Changeme_123@controller01/nova_api
#connection=mysql://nova:nova@localhost/nova
# by the server configuration, set this to no value. Example: mysql_sql_mode=
#mysql_sql_mode=TRADITIONAL
connection = mysql+pymysql://nova:Changeme_123@controller01/nova
# by the server configuration, set this to no value. Example: mysql_sql_mode=
#mysql_sql_mode=TRADITIONAL
# by the server configuration, set this to no value. Example: mysql_sql_mode=
#mysql_sql_mode=TRADITIONAL- 登录数据库并进入nova表
mysql -unova -puse nova;
bash
[root@controller01 ~]# mysql -unova -p
Enter password:
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 4286927
Server version: 10.1.20-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;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
MariaDB [nova]>- 回退其实就是将错误的数据库信息修改过来而已，需要修改 host和node，修改为源宿主机就可以了
- 查看信息select * from instances where uuid='8c1fb8d2-d90d-4250-b64f-b18e2df0465c'\G
- 修改信息update instances set host='computer07',node='computer07' where uuid='8c1fb8d2-d90d-4250-b64f-b18e2df0465c'\G
bash
MariaDB [nova]> select * from instances where uuid='8c1fb8d2-d90d-4250-b64f-b18e2df0465c'\G
*************************** 1. row ***************************
created_at: 2023-09-12 16:14:21
updated_at: 2023-09-12 22:41:34
deleted_at: NULL
id: 1705
internal_id: NULL
user_id: 5357091ec61b472bb75668dfe3e2b7e5
project_id: 8d71dc6fb0f244c0875717774b66a8c2
image_ref: 47c2723b-f479-4a58-977c-e102c2b1d4ef
kernel_id:
ramdisk_id:
launch_index: 0
key_name: NULL
key_data: NULL
power_state: 0
vm_state: error
memory_mb: 8192
vcpus: 8
hostname: hegui-test-linux7.2-4
host: computer03
user_data: IyEvYmluL2Jhc2gKcGFzc3dkIHJvb3Q8PEVPRgpyb290CnJvb3QKRU9G
reservation_id: r-2mz46wcx
scheduled_at: NULL
launched_at: 2023-09-12 16:14:42
terminated_at: NULL
display_name: hegui-test-linux7.2-4
display_description: hegui-test-linux7.2-4
availability_zone: test001
locked: 0
os_type: NULL
launched_on: computer07
instance_type_id: 247
vm_mode: NULL
uuid: 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
architecture: NULL
root_device_name: /dev/vda
access_ip_v4: NULL
access_ip_v6: NULL
config_drive:
task_state: NULL
default_ephemeral_device: NULL
default_swap_device: NULL
progress: 0
auto_disk_config: 1
shutdown_terminate: 0
disable_terminate: 0
root_gb: 200
ephemeral_gb: 0
cell_name: NULL
node: computer03
deleted: 0
locked_by: NULL
cleaned: 1
ephemeral_key_uuid: NULL
1 row in set (0.00 sec)
MariaDB [nova]> update instances set host='computer07',node='computer07' where uuid='8c1fb8d2-d90d-4250-b64f-b18e2df0465c'\G
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
MariaDB [nova]> select * from instances where uuid='8c1fb8d2-d90d-4250-b64f-b18e2df0465c'\G
*************************** 1. row ***************************
created_at: 2023-09-12 16:14:21
updated_at: 2023-09-12 22:41:34
deleted_at: NULL
id: 1705
internal_id: NULL
user_id: 5357091ec61b472bb75668dfe3e2b7e5
project_id: 8d71dc6fb0f244c0875717774b66a8c2
image_ref: 47c2723b-f479-4a58-977c-e102c2b1d4ef
kernel_id:
ramdisk_id:
launch_index: 0
key_name: NULL
key_data: NULL
power_state: 0
vm_state: error
memory_mb: 8192
vcpus: 8
hostname: hegui-test-linux7.2-4
host: computer07
user_data: IyEvYmluL2Jhc2gKcGFzc3dkIHJvb3Q8PEVPRgpyb290CnJvb3QKRU9G
reservation_id: r-2mz46wcx
scheduled_at: NULL
launched_at: 2023-09-12 16:14:42
terminated_at: NULL
display_name: hegui-test-linux7.2-4
display_description: hegui-test-linux7.2-4
availability_zone: test001
locked: 0
os_type: NULL
launched_on: computer07
instance_type_id: 247
vm_mode: NULL
uuid: 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
architecture: NULL
root_device_name: /dev/vda
access_ip_v4: NULL
access_ip_v6: NULL
config_drive:
task_state: NULL
default_ephemeral_device: NULL
default_swap_device: NULL
progress: 0
auto_disk_config: 1
shutdown_terminate: 0
disable_terminate: 0
root_gb: 200
ephemeral_gb: 0
cell_name: NULL
node: computer07
deleted: 0
locked_by: NULL
cleaned: 1
ephemeral_key_uuid: NULL
1 row in set (0.00 sec)
MariaDB [nova]>
MariaDB [nova]> exit
Bye
[root@controller01 neutron]#重置虚拟机状态【控制节点】
- 查看状态：
nova show 8c1fb8d2-d90d-4250-b64f-b18e2df0465c - 修复状态为active：
nova reset-state --active 8c1fb8d2-d90d-4250-b64f-b18e2df0465c - 关机：
nova stop 8c1fb8d2-d90d-4250-b64f-b18e2df0465c【因为要去冷迁移，所以直接关机】
bash
[root@controller01 neutron]# nova show 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
+--------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Property | Value |
+--------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | test001 |
| OS-EXT-SRV-ATTR:host | computer07 |
| OS-EXT-SRV-ATTR:hostname | hegui-test-linux7.2-4 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | computer07 |
| OS-EXT-SRV-ATTR:instance_name | instance-000006a9 |
| OS-EXT-SRV-ATTR:kernel_id | |
| OS-EXT-SRV-ATTR:launch_index | 0 |
| OS-EXT-SRV-ATTR:ramdisk_id | |
| OS-EXT-SRV-ATTR:reservation_id | r-2mz46wcx |
| OS-EXT-SRV-ATTR:root_device_name | /dev/vda |
| OS-EXT-SRV-ATTR:user_data | IyEvYmluL2Jhc2gKcGFzc3dkIHJvb3Q8PEVPRgpyb290CnJvb3QKRU9G |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | error |
| OS-SRV-USG:launched_at | 2023-09-12T16:14:42.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | |
| created | 2023-09-12T16:14:21Z |
| description | hegui-test-linux7.2-4 |
| fault | {"message": "error creating snapshot nova-resize from 8c1fb8d2-d90d-4250-b64f-b18e2df0465c_disk", "code": 500, "details": " File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 375, in decorated_function |
| | return function(self, context, *args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 4054, in finish_resize |
| | self._set_instance_obj_error_state(context, instance) |
| | File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 220, in __exit__ |
| | self.force_reraise() |
| | File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 196, in force_reraise |
| | six.reraise(self.type_, self.value, self.tb) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 4042, in finish_resize |
| | disk_info, image_meta) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 4007, in _finish_resize |
| | old_instance_type) |
| | File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 220, in __exit__ |
| | self.force_reraise() |
| | File \"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py\", line 196, in force_reraise |
| | six.reraise(self.type_, self.value, self.tb) |
| | File \"/usr/lib/python2.7/site-packages/nova/compute/manager.py\", line 4002, in _finish_resize |
| | block_device_info, power_on) |
| | File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\", line 7363, in finish_migration |
| | fallback_from_host=migration.source_compute) |
| | File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py\", line 3179, in _create_image |
| | backend.create_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME) |
| | File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/imagebackend.py\", line 938, in create_snap |
| | return self.driver.create_snap(self.rbd_name, name) |
| | File \"/usr/lib/python2.7/site-packages/nova/virt/libvirt/storage/rbd_utils.py\", line 382, in create_snap |
| | tpool.execute(vol.create_snap, name) |
| | File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\", line 125, in execute |
| | six.reraise(c, e, tb) |
| | File \"/usr/lib/python2.7/site-packages/eventlet/tpool.py\", line 83, in tworker |
| | rv = meth(*args, **kwargs) |
| | File \"/usr/lib/python2.7/site-packages/rbd.py\", line 594, in create_snap |
| | raise make_ex(ret, 'error creating snapshot %s from %s' % (name, self.name)) |
| | ", "created": "2023-09-12T22:36:17Z"} |
| flavor | 8c-8g-200G (f3463d6d-5d5c-45b7-b371-29e84c8a49e9) |
| hostId | a6531d2353b9eb7730d1cee93db522b51442cf6b2df6ef58026a39fb |
| host_status | UP |
| id | 8c1fb8d2-d90d-4250-b64f-b18e2df0465c |
| image | centos7.4 (47c2723b-f479-4a58-977c-e102c2b1d4ef) |
| key_name | - |
| locked | False |
| metadata | {} |
| name | hegui-test-linux7.2-4 |
| os-extended-volumes:volumes_attached | [] |
| out-network network | 111.11.199.77 |
| own-network network | 10.233.61.44 |
| security_groups | default |
| status | ERROR |
| tenant_id | 8d71dc6fb0f244c0875717774b66a8c2 |
| updated | 2023-09-12T22:41:34Z |
| user_id | 5357091ec61b472bb75668dfe3e2b7e5 |
+--------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
[root@controller01 neutron]#
[root@controller01 neutron]# nova reset-state --active 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
Reset state for server 8c1fb8d2-d90d-4250-b64f-b18e2df0465c succeeded; new state is active
[root@controller01 neutron]#
[root@controller01 neutron]# nova show 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
+--------------------------------------+----------------------------------------------------------+
| Property | Value |
+--------------------------------------+----------------------------------------------------------+
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | test001 |
| OS-EXT-SRV-ATTR:host | computer07 |
| OS-EXT-SRV-ATTR:hostname | hegui-test-linux7.2-4 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | computer07 |
| OS-EXT-SRV-ATTR:instance_name | instance-000006a9 |
| OS-EXT-SRV-ATTR:kernel_id | |
| OS-EXT-SRV-ATTR:launch_index | 0 |
| OS-EXT-SRV-ATTR:ramdisk_id | |
| OS-EXT-SRV-ATTR:reservation_id | r-2mz46wcx |
| OS-EXT-SRV-ATTR:root_device_name | /dev/vda |
| OS-EXT-SRV-ATTR:user_data | IyEvYmluL2Jhc2gKcGFzc3dkIHJvb3Q8PEVPRgpyb290CnJvb3QKRU9G |
| OS-EXT-STS:power_state | 0 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | active |
| OS-SRV-USG:launched_at | 2023-09-12T16:14:42.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | |
| created | 2023-09-12T16:14:21Z |
| description | hegui-test-linux7.2-4 |
| flavor | 8c-8g-200G (f3463d6d-5d5c-45b7-b371-29e84c8a49e9) |
| hostId | a6531d2353b9eb7730d1cee93db522b51442cf6b2df6ef58026a39fb |
| host_status | UP |
| id | 8c1fb8d2-d90d-4250-b64f-b18e2df0465c |
| image | centos7.4 (47c2723b-f479-4a58-977c-e102c2b1d4ef) |
| key_name | - |
| locked | False |
| metadata | {} |
| name | hegui-test-linux7.2-4 |
| os-extended-volumes:volumes_attached | [] |
| out-network network | 111.11.199.77 |
| own-network network | 10.233.61.44 |
| progress | 0 |
| security_groups | default |
| status | ACTIVE |
| tenant_id | 8d71dc6fb0f244c0875717774b66a8c2 |
| updated | 2023-09-12T23:28:25Z |
| user_id | 5357091ec61b472bb75668dfe3e2b7e5 |
+--------------------------------------+----------------------------------------------------------+
[root@controller01 neutron]#
[root@controller01 neutron]# nova stop 8c1fb8d2-d90d-4250-b64f-b18e2df0465c 恢复instance的信息【源计算节点】源宿主机上操作
- 我这虚拟机是在computer07上的，所以登录上该宿主机，进入
/var/lib/nova/instances/目录【存放实例信息的目录】
bash
[root@computer07 ~]# cd /var/lib/nova/instances/
[root@computer07 instances]# ls
154f17ab-d37b-4162-a870-4016c107312a 6e5783f1-e12c-494d-bcdc-60389105b658 9bdb337a-f247-4d45-8a89-f9288b54d5dd compute_nodes
2cec04ce-5ca2-4910-ae7d-d782b8a2c23c 7e10aa19-3caa-4e95-b4e0-2df5de633023 b39a8ac9-2c20-4d4e-b820-fedc59b0385c e2e90bec-0d3a-4185-80da-0e2cf6218ed5
5b4f6012-d48a-444a-bf8b-b3acb48b054a 8c1fb8d2-d90d-4250-b64f-b18e2df0465c_resize _base locks
[root@computer07 instances]#- 可以看到迁移的虚拟机id后面多了个_resize，我们mv重命名将_resize去掉【也可以去目的主机上的instance目录下删除该虚拟机的uuid，也可以不用去删除】
bash
[root@computer07 instances]# mv 8c1fb8d2-d90d-4250-b64f-b18e2df0465c_resize 8c1fb8d2-d90d-4250-b64f-b18e2df0465c
[root@computer07 instances]#
[root@computer07 instances]# ls
154f17ab-d37b-4162-a870-4016c107312a 6e5783f1-e12c-494d-bcdc-60389105b658 9bdb337a-f247-4d45-8a89-f9288b54d5dd compute_nodes
2cec04ce-5ca2-4910-ae7d-d782b8a2c23c 7e10aa19-3caa-4e95-b4e0-2df5de633023 b39a8ac9-2c20-4d4e-b820-fedc59b0385c e2e90bec-0d3a-4185-80da-0e2cf6218ed5
5b4f6012-d48a-444a-bf8b-b3acb48b054a 8c1fb8d2-d90d-4250-b64f-b18e2df0465c _base locks
[root@computer07 instances]# 测试
此时虚拟机就已经回退完成了，可以正常开机了。