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I had the same problem when I tried to upgrade two compute nodes from CentOS 7.2 to 7.3. You can find more details about the issue, if you google "Openstack doesn't work on CentOS 7.3 update" (question #407577).

Try CentOS 7.2 on a new compute node or downgrade kernel on your existing compute node from 3.10.0-514 to 3.10.0-327.


Update with a quick fix:

On the compute node(s) in the [libvirt] section of /etc/nova/nova.conf set hw_machine_type as follows:

hw_machine_type = x86_64=pc-i440fx-rhel7.2.0


I had the same problem when I tried to upgrade two compute nodes from CentOS 7.2 to 7.3. You can find more details about the issue, if you google "Openstack doesn't work on CentOS 7.3 update" (question #407577).

Try CentOS 7.2 on a new compute node or downgrade kernel on your existing compute node from 3.10.0-514 to 3.10.0-327.