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Problem solved with the following EPEL packages:

openstack-nova-common-2014.2-2.el7.centos.noarch.rpm openstack-nova-compute-2014.2-2.el7.centos.noarch.rpm python-nova-2014.2-2.el7.centos.noarch.rpm

I had to forcefully install them using rpm -ivh --force

Then I restarted openstack-nova-compute service

After this instances spawned correctly, yet I could not reach them (iptables rules missing, so I disabled iptables).

DHCP addresses got distributed to the instances correctly and I could reach internet from them via my Ubuntu-AIO which acts as a gateway to the internet as well.

Problem solved with the following EPEL packages:

openstack-nova-common-2014.2-2.el7.centos.noarch.rpm openstack-nova-compute-2014.2-2.el7.centos.noarch.rpm openstack-nova-common-2014.2-2.el7.centos.noarch.rpm openstack-nova-compute-2014.2-2.el7.centos.noarch.rpm python-nova-2014.2-2.el7.centos.noarch.rpm

I had to forcefully install them using rpm -ivh --force

Then I restarted openstack-nova-compute service

After this instances spawned correctly, yet I could not reach them (iptables rules missing, so I disabled iptables).

DHCP addresses got distributed to the instances correctly and I could reach internet from them via my Ubuntu-AIO which acts as a gateway to the internet as well.

Problem solved with the following EPEL packages:

openstack-nova-common-2014.2-2.el7.centos.noarch.rpm

openstack-nova-compute-2014.2-2.el7.centos.noarch.rpm

python-nova-2014.2-2.el7.centos.noarch.rpm

I had to forcefully install them using rpm -ivh --force

Then I restarted openstack-nova-compute service

After this instances spawned correctly, yet I could not reach them (iptables rules missing, so I disabled iptables).

DHCP addresses got distributed to the instances correctly and I could reach internet from them via my Ubuntu-AIO which acts as a gateway to the internet as well.