Hello Trying to re-run a Queens DPDK all-in-one using devstack which I built in August and hitting issues. The local.conf is identical between the two machines except I had to take the "stable/queens" off the end of the "networking-ovs-dpdk" plugin line as that no longer appears to work. The installation seems to proceed until it gets to setting the ip mtu on br-ex. I'm not using br-ex. I've declared OVS bridge mappings in the local.conf: #Dual socket platform with 16GB RAM,3072*2048kB hugepages leaves ~4G for the system. OVS_NUM_HUGEPAGES=3072 #Dual socket platform with 64GB RAM,14336*2048kB hugepages leaves ~6G for the system. #OVS_NUM_HUGEPAGES=14336 OVS_DATAPATH_TYPE=netdev OVS_LOG_DIR=/opt/stack/logs #OVS_DPDK_PORT_MAPPINGS=p1p1:br-dpdk1,p1p2:br-dpdk2,p2p1:br-dpdk3,p2p2:br-dpdk4 OVS_DPDK_PORT_MAPPINGS=p6p1:br-dpdk1,p6p2:br-dpdk2 #OVS_BRIDGE_MAPPINGS=physnet1:br-dpdk1,physnet2:br-dpdk2,physnet3:br-dpdk3,physnet4:br-dpdk4 OVS_BRIDGE_MAPPINGS=physnet1:br-dpdk1,physnet2:br-dpdk2 [[post-config|$NOVA_CONF]] [DEFAULT] firewall_driver=nova.virt.firewall.NoopFirewallDriver scheduler_default_filters=RamFilter,ComputeFilter,AvailabilityZoneFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,PciPassthroughFilter [[post-config|/etc/neutron/plugins/ml2/ml2_conf.ini]] [OVS] datapath_type=netdev [ml2_type_flat] #flat_networks=physnet1,physnet2,physnet3,physnet4 flat_networks=physnet1,physnet2 I cannot stress again how identical these systems are - same hardware, same base OS install (CentOS 7.5). I was (maybe erroneously!) thinking that if I had it devstack working on one system, having an identical system would be a piece of cake to install. This is the installation error: +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_bridge:21 local bridge=br-ex +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_bridge:22 local 'addbr_cmd=sudo ovs-vsctl -- --may-exist add-br br-ex' +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_bridge:24 '[' netdev '!=' system ']' +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_bridge:25 addbr_cmd='sudo ovs-vsctl -- --may-exist add-br br-ex -- set Bridge br-ex datapath_type=netdev' +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_bridge:28 sudo ovs-vsctl -- --may-exist add-br br-ex -- set Bridge br-ex datapath_type=netdev +lib/neutron_plugins/ovs_base:_neutron_ovs_base_add_public_bridge:119 set_mtu br-ex 1500 +functions:set_mtu:750 local dev=br-ex +functions:set_mtu:751 local mtu=1500 +functions:set_mtu:752 sudo ip link set mtu 1500 dev br-ex Cannot find device "br-ex" +functions:set_mtu:1 exit_trap +./stack.sh:exit_trap:522 local r=1 ++./stack.sh:exit_trap:523 jobs -p +./stack.sh:exit_trap:523 jobs= +./stack.sh:exit_trap:526 [[ -n '' ]] +./stack.sh:exit_trap:532 '[' -f /tmp/tmp.Dzbqzlk2fs ']' +./stack.sh:exit_trap:533 rm /tmp/tmp.Dzbqzlk2fs +./stack.sh:exit_trap:537 kill_spinner +./stack.sh:kill_spinner:432 '[' '!' -z '' ']' +./stack.sh:exit_trap:539 [[ 1 -ne 0 ]] +./stack.sh:exit_trap:540 echo 'Error on exit' Error on exit +./stack.sh:exit_trap:542 type -p generate-subunit +./stack.sh:exit_trap:543 generate-subunit 1545230781 1747 fail +./stack.sh:exit_trap:545 [[ -z /opt/stack/logs/screen ]] +./stack.sh:exit_trap:548 /home/stack/devstack/tools/worlddump.py -d /opt/stack/logs/screen Can someone explain what is going on here please? Thanks David