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This wiki page describes how to tune Mellanox OpenStack on Ubuntu 12.04 servers


InfiniBand Network

OpenSM Node

To configure OpenSM node:

1. Edit the file /etc/opensm/partitions.conf by adding the following line:

management=0xffff,ipoib, sl=0, defmember=full : ALL, ALL_SWITCHES=full,SELF=full;

Create the file if it does not exist.

For each VLAN value in the VLAN range used for VLAN network segmentation, add the following line in the file /etc/opensm/partitions.conf (for vlan-pkey association):

vlan<decimal-value>=0x<hexadecimal-value>, ipoib, sl=0, defmember=full: ALL;

In this manual, the VLAN range is 2-10 (mlnx_agent.conf /ml2_conf.ini). Therefore, add the following lines:

vlan1=0x1, ipoib, sl=0, defmember=full : ALL;
vlan2=0x2, ipoib, sl=0, defmember=full : ALL;
vlan3=0x3, ipoib, sl=0, defmember=full : ALL;
vlan4=0x4, ipoib, sl=0, defmember=full : ALL;
vlan5=0x5, ipoib, sl=0, defmember=full : ALL;
vlan6=0x6, ipoib, sl=0, defmember=full : ALL;
vlan7=0x7, ipoib, sl=0, defmember=full : ALL;
vlan8=0x8, ipoib, sl=0, defmember=full : ALL;
vlan9=0x9, ipoib, sl=0, defmember=full : ALL;
vlan10=0xa, ipoib, sl=0, defmember=full : ALL;

2. Modify the following line in the file /etc/opensm/opensm.conf from FALSE to TRUE:

allow_both_pkeys TRUE

3. Restart OpenSM:

service opensmd restart

4. Verify that all ports on all nodes have their ib interface (i.e. ib0) active, run ibdev2netdev on all hosts, and make sure that the port is up:

mlx4_0 port 1 ==> ib0 (Up)

If the port is down, try bringing it up by running “ifconfig ib0 up”, and make sure your switch ports are of type “InfiniBand”, and that all nodes can reach the OpenSM node by running “sminfo”.

Controller Node

To configure the Controller node:

1. Ensure that the file /etc/nova/nova.conf includes the following line:


2. If the security group value is changed, restart the Nova services:

# for i in $(initctl list | grep '^nova' | awk '{print $1}'); do service $i restart; done

Neutron Server Node

NOTE: The Neutron Server can sometimes be part of the Controller node.

To configure the Neutron Server node:

1. Edit /etc/neutron/neutron.conf and make sure Neutron is using ML2 plugin:

core_plugin = neutron.plugins.ml2.plugin.Ml2Plugin

2. Edit the ML2 configuration file /etc/neutron/plugins/ml2/ml2_conf.ini as follows:

type_drivers = vlan,flat
tenant_network_types = vlan 
mechanism_drivers = linuxbridge,mlnx
network_vlan_ranges=<physical_network>:<min_vlan>:<max_vlan> //(i.e. default:2:10)

enable_security_group = True

vnic_type = hostdev
apply_profile_patch = True

3. Install the required Deb for the Mellanox Neutron plugin (from Ubuntu’s repository):

apt-get install neutron-plugin-mlnx-agent

4. Edit /etc/neutron/plugins/mlnx/mlnx_conf.ini to match your environment:

network_vlan_ranges = <physical_network>:<min_vlan:<max_vlan> //(i.e. default:2:10)
tenant_network_type = vlan

physical_interface_mappings = <physical_network>:<ib interface>  //(i.e. default:ib0)
vnic_type = hostdev

support_old_agents = True

5. Restart Neutron Server:

/etc/init.d/neutron-server start

Compute Nodes

To configure the Compute node:

1. Create the file /etc/modprobe.d/mlx4_ib.conf with this line:

options mlx4_ib sm_guid_assign=0

2. Download mlnxvif, eSwitch Daemon (eSwitchd), and mlnx-dnsmasq from this link:


3. Install the Mellanox plugin services mlnxvif and eSwitchd:

dpkg –i python-mlnxvif_2014.1.1-1_all.deb
dpkg –i python-eswitchd_0.10-1_all.deb

4. Edit /etc/eswitchd/eswitchd.conf as follows:

fabrics=<physical_network>:<ib-interface> //(i.e. default:ib0)

5. Edit /etc/nova/nova.conf as follows:

compute_driver = libvirt.LibvirtDriver
libvirt_vif_driver = mlnxvif.vif.MlxEthVIFDriver
security_group_api = nova

6. Check if “ebrctl” appears in one of Nova’s rootwrap files:

grep 'ebrctl' /etc/nova/rootwrap.d/*
If “ebrctl” does not appear in one of Nova’s rootwrap files, edit the file /etc/nova/rootwrap.d/compute.filter as follows:
ebrctl: CommandFilter, ebrctl, root

7. Install the Neutron Mellanox agent (from Ubuntu repository):

apt-get install neutron-plugin-mlnx-agent

8. Copy /etc/neutron/plugins/mlnx/mlnx_conf.ini from the Neutron Server node to the same path on each Compute node.

9. Restart the following services:

/etc/init.d/nova-compute restart
/etc/init.d/eswitchd start
/etc/init.d/neutron-plugin-mlnx-agent start

Network Node

To configure the Network node:

1. Configure eIPoIB (for Linux bridge plugin) by editing the file /etc/infiniband/openib.conf as follows:


2. Restart OFED:

service openibd restart

3. Verify that the new Ethernet interfaces now appear with ibdev2netdev:

# ibdev2netdev
mlx4_0 port 1 ==> ib0 (Up)
mlx4_0 port 2 ==> ib1 (Down)
mlx4_0 port 1 ==> eth2 (Up)
mlx4_0 port 2 ==> eth1 (Down)

In eIPoIB, every ib interface has a matching eth interface. The ib interface used here is ib0, and the matching one is eth2 (same card and port names: mlx4_0 port 1). By using Ethtool, you can verify that ib0 is working on ib_ipoib driver, and eth2 is working on eth_ipoib driver, as follows:

# ethtool -i ib0
driver: ib_ipoib
version: 2.3-1.5.4_Sep 30 2014
firmware-version: 2.32.5100
bus-info: 0000:07:00.0# ethtool -i eth2
driver: eth_ipoib
version: 2.3-1.5.4 (Sep 30 2014)
firmware-version: 1
bus-info: ib0

4. Edit /etc/neutron/plugins/linuxbridge/linuxbridge_conf.ini as follows:

physical_interface_mappings = <physical_network>:<eth_ipoib-interface> 
//(i.e. default:eth2)

5. Restart the Linux bridge agent:

service neutron-linuxbridge-agent restart

6. To allow DHCP support, download mlnx-dnsmadq from this link: http://www.mellanox.com/downloads/solutions/openstack/icehouse/debian/

7. Install the package:

dpkg –i python-mlnx-dnsmasq_2014.1.1-1_all.deb

8. Configure the file /etc/neutron/dhcp_agent.ini:

dhcp_driver = mlnx_dhcp.MlnxDnsmasq

9. Make sure that the Dnsmasq which is installed as a part of the OpenStack (not mlnx-dnsmasq) environment is of version 2.65.

10. Copy /etc/neutron/neutron.conf from the Compute node to the same path on the Network node.

11. Edit /etc/neutron/plugins/linuxbridge/linuxbridge_conf.ini as follows:

physical_interface_mappings = <physical_network>:<eth_ipoib interface> 
(i.e. default:eth2)

12. Edit /etc/neutron/dhcp_agent.ini and /etc/neutron/l3_agent.ini as follows:

interface_driver = neutron.agent.linux.interface.BridgeInterfaceDriver

13. Restart the following services:

service neutron-plugin-linuxbridge-agent restart
service neutron-dhcp-agent restart
service neutron-l3-agent restart


  • If you're seeing request timeout errors in the plugin's logs, make sure that the eswitchd service is started and try to increase the request_timeout value in the plugin configuration file.