Network topology for HA

Types of network• OpenStack network topology resembles a traditional data center• Instances communicate internally over fixed IPs (a data center

private network)• This network is hidden from the world by NAT and a firewall

provided by the neutron component• For external presence, a public network is provided where floating

IPs are exposed (data center DMZ). • A management network is used to administer servers • We can also have a separate storage network for neutron if

necessary (data center storage network)• Two networks on eth1 are just tagged interfaces configured on top

of eth1 using a 802.1q kernel module.

Openstack daemons vs. networks