Comment 9 for bug 1869929

Think this isn't a bug but was related to SELinux. This issue happend when I upgraded nova on our compute node and then this occured. So I removed the @db.select_db_reader_mode decorator usage in nova/objects/service.py to make it start.

I then proceeded to upgrade Neutron and Ceilometer on the compute nodes, Neutron requires the following SELinux packages to be updated in order for it to work:

libselinux libselinux-python libselinux-utils selinux-policy selinux-policy-targeted

When I upgraded that, neutron and ceilometer I didn't bother testing again.
I removed the commented decorators now and restart nova-compute and it worked.

This is the install log:

Mar 31 17:22:07 Installed: 1:python2-nova-20.1.1-1.el7.noarch
Mar 31 17:22:08 Updated: 1:openstack-nova-common-20.1.1-1.el7.noarch
Mar 31 17:22:09 Updated: 1:openstack-nova-compute-20.1.1-1.el7.noarch
Mar 31 17:22:09 Erased: python-dogpile-cache-0.6.2-1.el7.noarch
Mar 31 17:22:11 Erased: 1:python-nova-18.2.3-1.el7.noarch
Mar 31 17:22:11 Erased: python-dogpile-core-0.4.1-2.el7.noarch
Apr 01 11:49:46 Updated: python2-os-traits-0.16.0-1.el7.noarch
Apr 01 11:55:16 Installed: python2-os-ken-0.4.1-1.el7.noarch
Apr 01 11:55:17 Updated: python2-neutron-lib-1.29.1-1.el7.noarch
Apr 01 11:55:17 Updated: python2-pyroute2-0.5.6-1.el7.noarch
Apr 01 11:55:19 Installed: 1:python2-neutron-15.0.2-1.el7.noarch
Apr 01 11:55:20 Updated: 1:openstack-neutron-common-15.0.2-1.el7.noarch
Apr 01 11:55:21 Updated: 1:openstack-neutron-openvswitch-15.0.2-1.el7.noarch
Apr 01 11:55:22 Updated: 1:openstack-neutron-15.0.2-1.el7.noarch
Apr 01 11:55:25 Erased: 1:python-neutron-13.0.6-1.el7.noarch
Apr 01 11:55:44 Installed: python2-zaqarclient-1.12.0-1.el7.noarch
Apr 01 11:55:45 Installed: 1:python2-ceilometer-13.1.0-1.el7.noarch
Apr 01 11:55:46 Updated: 1:openstack-ceilometer-common-13.1.0-1.el7.noarch
Apr 01 11:55:46 Updated: 1:openstack-ceilometer-polling-13.1.0-1.el7.noarch
Apr 01 11:55:48 Erased: 1:python-ceilometer-11.0.1-1.el7.noarch

The possibility of any of the additional packages after nova-compute there fixed it is very low.

The only thing I did manually except for that was to upgrade the SELinux packages mentioned above because that's required by Neutron.