实验说明：
本文介绍把OpenStack中一个实例扩容内存和硬盘的步骤，实际整个过程是对实例做冷迁移来达到配置扩容。
实例扩容前配置：c2m4d101
实例扩容后配置：c4m8d150
OpenStack 实例扩容配置操作
步骤：
获取admin用户权限
命令：source admin-openrc
获取实例ID
命令：nova list --all
代码语言：javascript复制# nova list --all
-------------------------------------- ------ ---------------------------------- --------- ------------ ------------- -----------------------
| ID | Name | Tenant ID | Status | Task State | Power State | Networks |
-------------------------------------- ------ ---------------------------------- --------- ------------ ------------- -----------------------
| 5d5f3e84-606f-4763-b659-cf5da1f45862 | 1 | 76e5e27da0ea44b39339f219f9a3ea4b | SHUTOFF | - | Shutdown | vlan192=10.10.192.142 |
-------------------------------------- ------ ---------------------------------- --------- ------------ ------------- ----------------------- 获取到实例ID为 5d5f3e84-606f-4763-b659-cf5da1f45862
查看实例现在配置
命令：nova show 5d5f3e84-606f-4763-b659-cf5da1f45862
代码语言：javascript复制# nova show 5d5f3e84-606f-4763-b659-cf5da1f45862
-------------------------------------- ---------------------------------------------------------------------
| Property | Value |
-------------------------------------- ---------------------------------------------------------------------
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-SRV-ATTR:host | compute1 |
| OS-EXT-SRV-ATTR:hostname | 1 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | compute1 |
| OS-EXT-SRV-ATTR:instance_name | instance-00000042 |
| 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-cfsk20p6 |
| OS-EXT-SRV-ATTR:root_device_name | /dev/vda |
| OS-EXT-SRV-ATTR:user_data | - |
| OS-EXT-STS:power_state | 4 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | stopped |
| OS-SRV-USG:launched_at | 2021-12-07T10:17:18.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | True |
| created | 2021-11-26T13:45:29Z |
| description | - |
| flavor:disk | 101 |
| flavor:ephemeral | 0 |
| flavor:extra_specs | {} |
| flavor:original_name | c2m4d101 |
| flavor:ram | 4096 |
| flavor:swap | 0 |
| flavor:vcpus | 2 |
| hostId | 3578ea6c69855c946effdbeefa65af0082717e20f9f5d681e03e474e |
| host_status | UP |
| id | 5d5f3e84-606f-4763-b659-cf5da1f45862 |
| image | CentOS-7.4-x86_64-2021-08-21 (8810b721-65ee-429d-b40e-0de4de737af1) |
| key_name | - |
| locked | False |
| metadata | {} |
| name | 1 |
| os-extended-volumes:volumes_attached | [] |
| security_groups | default |
| status | SHUTOFF |
| tags | [] |
| tenant_id | 76e5e27da0ea44b39339f219f9a3ea4b |
| updated | 2021-12-07T10:22:18Z |
| user_id | e8449e95fcfe42369f9e75e77309c369 |
| vlan192 network | 10.10.192.142 |
-------------------------------------- --------------------------------------------------------------------- 从上面可以看到该实例现在配置是c2m4d101，状态为SHUTOFF
获取实例类型ID
命令：openstack flavor list
代码语言：javascript复制# openstack flavor list
-------------------------------------- ----------- ------- ------ ----------- ------- -----------
| ID | Name | RAM | Disk | Ephemeral | VCPUs | Is Public |
-------------------------------------- ----------- ------- ------ ----------- ------- -----------
| 1520e952-4ed9-4a4c-ba03-237693e0e879 | c6m10d100 | 10240 | 100 | 0 | 6 | True |
| 41e69056-48d8-48ab-902d-94863cbacfec | c4m8d80 | 8192 | 80 | 0 | 4 | True |
| 5420bbbb-33de-4764-bc78-d45cb93d4849 | c2m4d101 | 4096 | 101 | 0 | 2 | True |
| 5cc1ee41-b3c6-499a-8941-b2dd28f5136e | c4m10d50 | 10200 | 50 | 0 | 4 | True |
| 919e5c1e-7703-497f-9576-eaee29959a08 | c2m2d20 | 2048 | 20 | 0 | 2 | True |
| c56fe138-af89-4b48-b1e8-0be6366d4fe6 | c2m4d20 | 4096 | 20 | 0 | 2 | True |
| dcc7c785-833d-47b9-8582-46d96ea75b24 | c4m8d150 | 8192 | 150 | 0 | 4 | True |
| ffe7444a-b3d4-4e08-b206-59e778486e09 | c4m8d50 | 8096 | 50 | 0 | 4 | True |
-------------------------------------- ----------- ------- ------ ----------- ------- ----------- 我们需要扩容到c4m8d150的实例类型，id为dcc7c785-833d-47b9-8582-46d96ea75b24
执行扩容
命令：nova resize --poll 5d5f3e84-606f-4763-b659-cf5da1f45862 dcc7c785-833d-47b9-8582-46d96ea75b24
代码语言：javascript复制# nova resize --poll 5d5f3e84-606f-4763-b659-cf5da1f45862 dcc7c785-833d-47b9-8582-46d96ea75b24
Server resizing... 100% complete
Finished查看实例配置和状态
代码语言：javascript复制# nova show 5d5f3e84-606f-4763-b659-cf5da1f45862
-------------------------------------- ---------------------------------------------------------------------
| Property | Value |
-------------------------------------- ---------------------------------------------------------------------
| OS-DCF:diskConfig | AUTO |
| OS-EXT-AZ:availability_zone | nova |
| OS-EXT-SRV-ATTR:host | compute1 |
| OS-EXT-SRV-ATTR:hostname | 1 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | compute1 |
| OS-EXT-SRV-ATTR:instance_name | instance-00000042 |
| 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-cfsk20p6 |
| OS-EXT-SRV-ATTR:root_device_name | /dev/vda |
| OS-EXT-SRV-ATTR:user_data | - |
| OS-EXT-STS:power_state | 4 |
| OS-EXT-STS:task_state | - |
| OS-EXT-STS:vm_state | resized |
| OS-SRV-USG:launched_at | 2021-12-07T14:48:19.000000 |
| OS-SRV-USG:terminated_at | - |
| accessIPv4 | |
| accessIPv6 | |
| config_drive | True |
| created | 2021-11-26T13:45:29Z |
| description | - |
| flavor:disk | 150 |
| flavor:ephemeral | 0 |
| flavor:extra_specs | {} |
| flavor:original_name | c4m8d150 |
| flavor:ram | 8192 |
| flavor:swap | 0 |
| flavor:vcpus | 4 |
| hostId | 3578ea6c69855c946effdbeefa65af0082717e20f9f5d681e03e474e |
| host_status | UP |
| id | 5d5f3e84-606f-4763-b659-cf5da1f45862 |
| image | CentOS-7.4-x86_64-2021-08-21 (8810b721-65ee-429d-b40e-0de4de737af1) |
| key_name | - |
| locked | False |
| metadata | {} |
| name | 1 |
| os-extended-volumes:volumes_attached | [] |
| progress | 0 |
| security_groups | default |
| status | VERIFY_RESIZE |
| tags | [] |
| tenant_id | 76e5e27da0ea44b39339f219f9a3ea4b |
| updated | 2021-12-07T14:48:19Z |
| user_id | e8449e95fcfe42369f9e75e77309c369 |
| vlan192 network | 10.10.192.142 |
-------------------------------------- --------------------------------------------------------------------- 从上可以看到实际已经扩容到c4m8d150，状态为VERIFY_RESIZE
最后确认迁移
命令：nova resize-confirm <实例ID>
代码语言：javascript复制# nova resize-confirm 5d5f3e84-606f-4763-b659-cf5da1f45862执行这一步之后再查看实际状态nova show <实例id> 就可以看到状态已经变为SHUTOFF，表示扩容已经成功
