OpenStack: Configuring OpenStack Networking on the Nova Compute Node

• Install

[root@server2-b nova]# yum -y install openstack-neutron-openvswitch openstack-neutron-ml2 openstack-selinux

• Backup conf & ini files:

[root@server2-b nova]# cd /etc/neutron/plugins/
[root@server2-b plugins]# cp openvswitch/ovs_neutron_plugin.ini openvswitch/ovs_neutron_plugin.ini.orig
[root@server2-b plugins]# cp ml2/ml2_conf.ini ml2/ml2_conf.ini.orig
[root@server2-b plugins]# cp /etc/neutron/neutron.conf /etc/neutron/neutron.conf.orig

• Copy over conf & ini files from server2-a:

[root@server2-b plugins]# scp server2-a:/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini openvswitch/
root@server2-a's password: 
ovs_neutron_plugin.ini                                                 100% 6530     6.4KB/s   00:00    
[root@server2-b plugins]# scp server2-a:/etc/neutron/plugins/ml2/ml2_conf.ini ml2/
root@server2-a's password: 
ml2_conf.ini                                                           100% 2419     2.4KB/s   00:00    
[root@server2-b plugins]# scp server2-a:/etc/neutron/neutron.conf /etc/neutron/neutron.conf
root@server2-a's password: 
neutron.conf

• Enable ML2 framework:

[root@server2-b plugins]# ln -s /etc/neutron/plugins/ml2/ml2_conf.ini /etc/neutron/plugin.ini

• Start & enable openvswitch:

[root@server2-b plugins]# systemctl start openvswitch
[root@server2-b plugins]# grep ERROR /var/log/openvswitch/ovs*
[root@server2-b plugins]# systemctl enable openvswitch
ln -s '/usr/lib/systemd/system/openvswitch.service' '/etc/systemd/system/multi-user.target.wants/openvswitch.service'

• Create bridges in openvswich:

[root@server2-b plugins]# ovs-vsctl add-br br-int
[root@server2-b plugins]# ovs-vsctl add-br br-eth1
[root@server2-b plugins]# ovs-vsctl add-port br-eth1 eth1

• Backup ifcfg files:

[root@server2-b plugins]# cp /etc/sysconfig/network-scripts/ifcfg-eth1 /root
[root@server2-b plugins]# cp /etc/sysconfig/network-scripts/ifcfg-eth1 /etc/sysconfig/network-scripts/ifcfg-br-eth1

• Edit the ifcfg-eth1 file:

DEVICE=eth1
ONBOOT=yes
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-eth1

• And the ifcfg-br-eth1 file:

DEVICE=br-eth1
BOOTPROTO=static
ONBOOT=yes
TYPE=OVSBridge
DEVICETYPE=ovs
USERCTL=yes
PEERDNS=yes
IPV6INIT=no
IPADDR=172.25.102.11
NETMASK=255.255.255.0

• Restart the network:

[root@server2-b plugins]# systemctl restart network.service

• Append /etc/sysctl.conf:

# System default settings live in /usr/lib/sysctl.d/00-system.conf.
# To override those settings, enter new settings here, or in an /etc/sysctl.d/<name>.conf file
#
# For more information, see sysctl.conf(5) and sysctl.d(5).
net.ipv4.ip_forward=1

• Validate the setting:

[root@server2-b plugins]# sysctl -p
net.ipv4.ip_forward = 1

• Start agent:

[root@server2-b plugins]# systemctl start neutron-openvswitch-agent.service
[root@server2-b plugins]# grep ERROR /var/log/neutron/openvswitch-agent.log 
[root@server2-b plugins]# systemctl enable neutron-openvswitch-agent.service 
ln -s '/usr/lib/systemd/system/neutron-openvswitch-agent.service' '/etc/systemd/system/multi-user.target.wants/neutron-openvswitch-agent.service'

• Start and enable neutron-ovs-cleanup service:

[root@server2-b plugins]# systemctl start neutron-ovs-cleanup
[root@server2-b plugins]# systemctl enable neutron-ovs-cleanup
ln -s '/usr/lib/systemd/system/neutron-ovs-cleanup.service' '/etc/systemd/system/multi-user.target.wants/neutron-ovs-cleanup.service'

• From server2-a, use the neutron command to query the status of the openvswitch agent running on server2-b using admin credentials:

[root@server2-a ~]# source /root/keystonerc_admin 
[root@server2-a ~(keystone_admin)]# neutron agent-list
+--------------------------------------+--------------------+-----------------------+-------+----------------+
| id                                   | agent_type         | host                  | alive | admin_state_up |
+--------------------------------------+--------------------+-----------------------+-------+----------------+
| 1764b22e-8ce2-4d0d-b575-544cb276376e | Metadata agent     | server2-a.example.com | :-)   | True           |
| 7a40ba76-78a8-4811-bea4-d653eec74e21 | Open vSwitch agent | server2-a.example.com | :-)   | True           |
| b04543d8-637f-4787-978f-3a017e38a7be | Open vSwitch agent | server2-b.example.com | :-)   | True           |
| f28f8b4d-906b-437b-a9b7-dc555aeb2c86 | DHCP agent         | server2-a.example.com | :-)   | True           |
| f96a75c8-63c1-468f-a0c1-8076d59c7d19 | L3 agent           | server2-a.example.com | :-)   | True           |
+--------------------------------------+--------------------+-----------------------+-------+----------------+