The example architecture with legacy networking (nova-network) requires a controller node and at least one compute node. The controller node contains one network interface on the management network. The compute node contains one network interface on the management network and one on the external network. Network interface names vary by distribution. Traditionally, interfaces use "eth" followed by a sequential number. To cover all variations, this guide simply refers to the first interface as the interface with the lowest number and the second interface as the interface with the highest number.

Unless you intend to use the exact configuration provided in this example architecture, you must modify the networks in this procedure to match your environment. Also, each node must resolve the other nodes by name in addition to IP address. For example, the controller name must resolve to 10.0.0.11, the IP address of the management interface on the controller node. Reconfiguring network interfaces will interrupt network connectivity. We recommend using a local terminal session for these procedures.

Configure the first interface as the management interface: IP address: 10.0.0.11 Network mask: 255.255.255.0 (or /24) Default gateway: 10.0.0.1 Set the hostname of the node to controller. Edit the /etc/hosts file to contain the following: # controller 10.0.0.11 controller # compute1 10.0.0.31 compute1 You must remove or comment the line beginning with 127.0.1.1.

Configure the first interface as the management interface: IP address: 10.0.0.31 Network mask: 255.255.255.0 (or /24) Default gateway: 10.0.0.1 Additional compute nodes should use 10.0.0.32, 10.0.0.33, and so on. The external interface uses a special configuration without an IP address assigned to it. Configure the second interface as the external interface: Replace INTERFACE_NAME with the actual interface name. For example, eth1 or ens224. Edit the /etc/network/interfaces file to contain the following: # The external network interface auto INTERFACE_NAME iface INTERFACE_NAME inet manual up ip link set dev $IFACE up down ip link set dev $IFACE down Edit the /etc/sysconfig/network-scripts/ifcfg-INTERFACE_NAME file to contain the following: Do not change the HWADDR and UUID keys. DEVICE=INTERFACE_NAME TYPE=Ethernet ONBOOT="yes" BOOTPROTO="none" Edit the /etc/sysconfig/network/ifcfg-INTERFACE_NAME file to contain the following: STARTMODE='auto' BOOTPROTO='static' Restart networking: # service networking stop && service networking start # service network restart Set the hostname of the node to compute1. Edit the /etc/hosts file to contain the following: # compute1 10.0.0.31 compute1 # controller 10.0.0.11 controller You must remove or comment the line beginning with 127.0.1.1.

We recommend that you verify network connectivity to the internet and among the nodes before proceeding further. From the controller node, ping a site on the internet: # ping -c 4 openstack.org PING openstack.org (174.143.194.225) 56(84) bytes of data. 64 bytes from 174.143.194.225: icmp_seq=1 ttl=54 time=18.3 ms 64 bytes from 174.143.194.225: icmp_seq=2 ttl=54 time=17.5 ms 64 bytes from 174.143.194.225: icmp_seq=3 ttl=54 time=17.5 ms 64 bytes from 174.143.194.225: icmp_seq=4 ttl=54 time=17.4 ms --- openstack.org ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3022ms rtt min/avg/max/mdev = 17.489/17.715/18.346/0.364 ms From the controller node, ping the management interface on the compute node: # ping -c 4 compute1 PING compute1 (10.0.0.31) 56(84) bytes of data. 64 bytes from compute1 (10.0.0.31): icmp_seq=1 ttl=64 time=0.263 ms 64 bytes from compute1 (10.0.0.31): icmp_seq=2 ttl=64 time=0.202 ms 64 bytes from compute1 (10.0.0.31): icmp_seq=3 ttl=64 time=0.203 ms 64 bytes from compute1 (10.0.0.31): icmp_seq=4 ttl=64 time=0.202 ms --- compute1 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3000ms rtt min/avg/max/mdev = 0.202/0.217/0.263/0.030 ms From the compute node, ping a site on the internet: # ping -c 4 openstack.org PING openstack.org (174.143.194.225) 56(84) bytes of data. 64 bytes from 174.143.194.225: icmp_seq=1 ttl=54 time=18.3 ms 64 bytes from 174.143.194.225: icmp_seq=2 ttl=54 time=17.5 ms 64 bytes from 174.143.194.225: icmp_seq=3 ttl=54 time=17.5 ms 64 bytes from 174.143.194.225: icmp_seq=4 ttl=54 time=17.4 ms --- openstack.org ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3022ms rtt min/avg/max/mdev = 17.489/17.715/18.346/0.364 ms From the compute node, ping the management interface on the controller node: # ping -c 4 controller PING controller (10.0.0.11) 56(84) bytes of data. 64 bytes from controller (10.0.0.11): icmp_seq=1 ttl=64 time=0.263 ms 64 bytes from controller (10.0.0.11): icmp_seq=2 ttl=64 time=0.202 ms 64 bytes from controller (10.0.0.11): icmp_seq=3 ttl=64 time=0.203 ms 64 bytes from controller (10.0.0.11): icmp_seq=4 ttl=64 time=0.202 ms --- controller ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3000ms rtt min/avg/max/mdev = 0.202/0.217/0.263/0.030 ms