Open Stack

On 12/19/18 3:29 PM, d.lake at surrey.ac.uk wrote:
> Would appreciate some help here please.   Br-ex is not being added and 
> the mtu command causes the whole thing to not install.

Comments inline.

> *From:*Lake, David (PG/R - Elec Electronic Eng)
> *Sent:* 19 December 2018 15:22
> *To:* openstack-dev at lists.openstack.org
> *Subject:* [networking-ovs-dpdk] Issue creating br-ex...
> 
> 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

Have you tried running this by hand on the system and see what happens?

'sudo ovs-vsctl -- --may-exist add-br br-ex -- set Bridge br-ex 
datapath_type=netdev'

It works for me locally, creating br-ex.  Perhaps there is some delay on 
your system?  But I would expect the call wouldn't return successfully then.

Or perhaps I'm mis-understanding and you meant to set PUBLIC_BRIDGE in 
your local.conf as well?

Short of that you should look at what's changed in the relevant files in 
the devstack tree to see if it was caused by a recent change.

-Brian


> +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
>