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2025-01-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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The editor will share with you how to migrate openstack CVM manually. I hope you will get something after reading this article. Let's discuss it together.
1. Manually migrate vm data image files from one host to another (just copy it)
Generally, under the / var/lib/docker/volumes/nova_compute/_data/instances/ directory, uuid corresponds to the corresponding file directory.
Copy all the directories corresponding to the CVM to the directory where the virtual machine of the target host resides
Scp-r 767adf2f-b1ee-4121-a90d-baf025dd9e40 10.200.100.17:/var/lib/docker/volumes/nova_compute/_data/instances (UUID)
Enter the target host and change the directory to belong to the master group
Docker exec-it nova_libvirt bash
Cd / var/lib/nova/instances
Chown-R nova:nova 767adf2f-b1ee-4121-a90d-baf025dd9e40
2. Change the database
Log in to the control node database to change the contents of the three tables
Instances
Ml2_port_bindings
Ml2_port_binding_levels
Remember the previous configuration, the virtual machine is on that host (for error rollback)
Update host information for vm
Use nova / / use nova database
Select * from instances where uuid='767adf2f-b1ee-4121-a90d-baf025dd9e40'; / / read the information of the CVM behind the uuid, and find a place to copy and store it.
Update instances set launched_on='10-200-100-17 where uuid='767adf2f-b1ee-4121-a90d-baf025dd9e40';// update the host of the CVM as the target machine (10.200.100.17)
Device_id and CVM uuid are the same.
Use neutron / / use neutron database
Find the port_id used by the CVM
Select * from ports where device_id='767adf2f-b1ee-4121-a90d-baf025dd9e40'\ G//port_id is the corresponding value in the output
Find the CVM bound to the port_id
Select * from ml2_port_bindings where port_id='266fc080-cb1c-4ff3-87a6-7bd0b59c47c6'\ G / / port_id is the result of the last query / / the result is also saved.
Update bound host host
Update ml2_port_bindings set host='10-200,100-17' where port_id='266fc080-cb1c-4ff3-87a6-7bd0b59c47c6targets; / / Update host target (10.200.100.17)
Update ml2_port_binding_levels
Select * from ml2_port_binding_levels where port_id='266fc080-cb1c-4ff3-87a6-7bd0b59c47c6'\ Grabble
Update ml2_port_binding_levels set host='10-200100-17' where port_id='266fc080-cb1c-4ff3-87a6-7bd0b59c47c6'
Nova reset-state-active 767adf2f-b1ee-4121-a90d-baf025dd9e40
Finally, restart the vm and you can start the vm successfully.
If vm startup fails
Vm's instances table vm_state will be valued as error. If you want to recover at this time, you need to set this state to stopped, or some other state.
The above operation can be rolled back
After reading this article, I believe you have some understanding of "how to migrate openstack CVM manually". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!
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