How To Migrate Running Instances From One Openstack Compute Server To Another Openstack Compute Server

Question

Hi Guys,

In AWS we can migrate our instance from one account to another account, one Dedicated host to another Dedicated host. I have one instance in OpenStack and I want to migrate it from One Openstack Compute Server To Another Openstack Compute Server. How can I do that?

Thank You

Answer 1

Hi@akhtar,

You can migrate your instance in OpenStack also. Follow the below given steps.

• Check the ID of the instance to be migrated.

$ openstack server list
+--------------------------------------+------+--------+-----------------+------------+
| ID                                   | Name | Status | Networks        | Image Name |
+--------------------------------------+------+--------+-----------------+------------+
| d1df1b5a-70c4-4fed-98b7-423362f2c47c | vm1  | ACTIVE | private=a.b.c.d | ...        |
+--------------------------------------+------+--------+-----------------+------------+
| d693db9e-a7cf-45ef-a7c9-b3ecb5f22645 | vm2  | ACTIVE | private=e.f.g.h | ...        |
+--------------------------------------+------+--------+-----------------+------------+

•  Check the information associated with the instance. In this example, vm1 is running on HostB.

$ openstack server show d1df1b5a-70c4-4fed-98b7-423362f2c47c
+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| ...                  | ...                                  |
| OS-EXT-SRV-ATTR:host | HostB                                |
| ...                  | ...                                  |
| addresses            | a.b.c.d                              |
| flavor               | m1.tiny                              |
| id                   | d1df1b5a-70c4-4fed-98b7-423362f2c47c |
| name                 | vm1                                  |
| status               | ACTIVE                               |
| ...                  | ...                                  |
+----------------------+--------------------------------------+

• Select the compute node the instance will be migrated to. In this example, we will migrate the instance to HostC.

$ openstack compute service list
+----+------------------+-------+----------+---------+-------+----------------------------+
| ID | Binary           | Host  | Zone     | Status  | State | Updated At                 |
+----+------------------+-------+----------+---------+-------+----------------------------+
|  3 | nova-conductor   | HostA | internal | enabled | up    | 2017-02-18T09:42:29.000000 |
|  4 | nova-scheduler   | HostA | internal | enabled | up    | 2017-02-18T09:42:26.000000 |
|  5 | nova-consoleauth | HostA | internal | enabled | up    | 2017-02-18T09:42:29.000000 |
|  6 | nova-compute     | HostB | nova     | enabled | up    | 2017-02-18T09:42:29.000000 |
|  7 | nova-compute     | HostC | nova     | enabled | up    | 2017-02-18T09:42:29.000000 |
+----+------------------+-------+----------+---------+-------+----------------------------+

• Check that HostC has enough resources for migration.

$ openstack host show HostC
+-------+------------+-----+-----------+---------+
| Host  | Project    | CPU | Memory MB | Disk GB |
+-------+------------+-----+-----------+---------+
| HostC | (total)    |  16 |     32232 |     878 |
| HostC | (used_now) |  22 |     21284 |     422 |
| HostC | (used_max) |  22 |     21284 |     422 |
| HostC | p1         |  22 |     21284 |     422 |
| HostC | p2         |  22 |     21284 |     422 |
+-------+------------+-----+-----------+---------+

• Migrate the instance using the openstack server migrate command.

$ openstack server migrate SERVER --live HOST_NAME

Check that the instance has been migrated successfully, using openstack server list.

Hope it will help you.

Thank You