Migrate Virtual Machines

Procedure

  1. View the OpenStack server list to determine the VM 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 | ...        |
+--------------------------------------+------+--------+-----------------+------------+
  2. Select the destination host.
    • For manual selection of the destination host, proceed to the next step.
    • For automatic selection of the destination host, go to Step 6.
  3. View the server details of the selected VM. 
    # 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                               |
| ...                  | ...                                  |
+----------------------+--------------------------------------+
  4. Determine the destination host to migrate the selected VM. 
    # 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 |
+----+------------------+-------+----------+---------+-------+----------------------------+

# 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 |
+-------+------------+-----+-----------+---------+
  5. Migrate the VM instance.
    • Manual selection of the destination host:
      # openstack server migrate d1df1b5a-70c4-4fed-98b7-423362f2c47c --live HostC
    • Automatic selection of the destination host:
      # nova live-migration d1df1b5a-70c4-4fed-98b7-423362f2c47c
  6. View the host server details of the migrated VM to confirm the status of migration. If migration fails, go to Step 8. 
    # openstack server show d1df1b5a-70c4-4fed-98b7-423362f2c47c

+----------------------+--------------------------------------+
| Field                | Value                                |
+----------------------+--------------------------------------+
| ...                  | ...                                  |
| OS-EXT-SRV-ATTR:host | HostC                                |
| ...                  | ...                                  |
+----------------------+--------------------------------------+
  7. Optional: View the log files on the controller and compute nodes for more information about migration failure.
    • nova-scheduler
    • nova-conductor
    • nova-compute
  8. Optional: Stop the migration manually. 
    # nova live-migration-abort INSTANCE_ID MIGRATION_ID
  9. Optional: Force complete the migration. 
    # nova live-migration-force-complete INSTANCE_ID MIGRATION_ID
9036928-00 Rev AA