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how do i keep vm running after compute reboot without controller accessability

asked 2015-06-16 10:35:41 -0500

Uzi gravatar image

updated 2015-06-16 10:37:53 -0500

Hi All i am using openstack Juno with Ubuntu controller/compute

there use cases when controller wont be accessible to compute ,

how do i keep the current compute nova/neutron state when such happen after i reboot the compute even if controller not accessible ? (that is keep the VMs active , keep the current neutron/ml2/ovs flows as they been )

post reboot if controller is accessible resume the VMs to active is via this nova.conf attribute

resume_guests_state_on_host_boot=true

thanks

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The best practice is not to reboot compute nodes during controller connection outage window. You can restart a VM by using virsh if using qemu/kvm. The VM however might not be able to get its IP unless DHCP agent is also running on that compute node.

alfredcs@yahoo.com gravatar imagealfredcs@yahoo.com ( 2015-06-17 01:53:44 -0500 )edit

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answered 2015-06-17 01:57:56 -0500

uts9 gravatar image

updated 2015-06-17 01:59:03 -0500

Sometimes compute node will have difficulty in reconnecting to control node when it is up. So it better to configure your controller node in HA.

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thanks ! , VM is at active state i encounter with yet another problem

the OVS bridges cleared from flows when controller accessible flows re populated with the correct flows derived from VMs attached networks

can i configure the ovs/neutron to keep last flows configuration after reboot ?

Uzi gravatar imageUzi ( 2015-06-17 03:10:04 -0500 )edit

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Asked: 2015-06-16 10:35:41 -0500

Seen: 568 times

Last updated: Jun 17 '15