Comment 5 for bug 1423790

Updated Workaround:

* Ubuntu 14.04 Upgrade Procedure For System With contrail-vrouter-3.13.0-35-generic:
        Use the following upgrade procedure for Contrail R1.20 systems based on Ubuntu 14.04 with the
        contrail-vrouter-3.13.0-35-generic installed. The command sequence upgrades the kernel version and also reboots the compute nodes when finished.

   fab install_pkg_all:/tmp/contrail-install-packages-x.xx-xxx~havana_all.deb;

   fab migrate_compute_kernel;

   fab upgrade_contrail:<from>,/tmp/contrail-install-packages-x.xx-xxx~havana_all.deb;

   fab upgrade_kernel_all;

   fab restart_openstack_compute;

* Ubuntu 14.04 Upgrade Procedure For System With contrail-vrouter-dkms:
        Use the following upgrade procedure for Contrail R1.20 systems based on Ubuntu 14.04 with the
        contrail-vrouter-dkms installed. The command sequence upgrades the kernel version and also reboots the compute nodes when finished.

   fab upgrade_contrail:<from>,/tmp/contrail-install-packages-x.xx-xxx~havana_all.deb;

All nodes in the cluster can be upgraded to kernel version 3.13.0-40 by using the following fabric-utils command​:

             fab upgrade_kernel_all