I have a server with 6 NICs installed and is running Ubuntu 12.04LTS. I want to setup 4 guest VMs using kvm. Now I want to assign 2 NICs for the host(1 Public IP and 1 private IP), and 1 NIC each to 4 guest VM(all private IP). How do I do this?
/etc/network/interfaces
I am having trouble with my configuration file shown below:
# The loopback network interface
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.1.109
netmask 255.255.255.0
gateway 192.168.1.5
auto eth1
iface eth1 inet static
address 192.168.1.117
netmask 255.255.255.0
auto eth2
iface eth2 inet manual
auto br0
iface br0 inet static
address 192.168.1.118
netmask 255.255.255.0
bridge_ports eth2
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
auto eth3
iface eth3 inet manual
auto br1
iface br1 inet static
address 192.168.1.119
netmask 255.255.255.0
bridge_ports eth3
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
auto eth4
iface eth4 inet manual
auto br2
iface br2 inet static
address 192.168.1.123
netmask 255.255.255.0
bridge_ports eth4
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
auto eth5
iface eth5 inet manual
auto br3
iface br3 inet static
address 192.168.1.124
netmask 255.255.255.0
bridge_ports eth5
bridge_fd 9
bridge_hello 2
bridge_maxage 12
bridge_stp off
Update: I have it working now. The only issue is that the NICs assigned to be used with the guest still gets an IP on the host, output follows:
eth0 Link encap:Ethernet HWaddr 78:2b:cb:2b:61:ed
inet addr:192.168.1.109 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::7a2b:cbff:fe2b:61ed/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:117 errors:0 dropped:0 overruns:0 frame:0
TX packets:108 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:26221 (26.2 KB) TX bytes:17217 (17.2 KB)
Interrupt:36 Memory:d2000000-d2012800
eth1 Link encap:Ethernet HWaddr 78:2b:cb:2b:61:ee
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::7a2b:cbff:fe2b:61ee/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:40 errors:0 dropped:0 overruns:0 frame:0
TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:9898 (9.8 KB) TX bytes:3409 (3.4 KB)
Interrupt:48 Memory:d4000000-d4012800
eth2 Link encap:Ethernet HWaddr 00:10:18:a8:84:80
inet6 addr: fe80::210:18ff:fea8:8480/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:46 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11309 (11.3 KB) TX bytes:2523 (2.5 KB)
Interrupt:47 Memory:da000000-da012800
eth3 Link encap:Ethernet HWaddr 00:10:18:a8:84:82
inet6 addr: fe80::210:18ff:fea8:8482/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:51 errors:0 dropped:0 overruns:0 frame:0
TX packets:17 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:12541 (12.5 KB) TX bytes:4154 (4.1 KB)
Interrupt:46 Memory:dc000000-dc012800
eth4 Link encap:Ethernet HWaddr 00:10:18:a8:84:84
inet6 addr: fe80::210:18ff:fea8:8484/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:55 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:15136 (15.1 KB) TX bytes:3053 (3.0 KB)
Interrupt:38 Memory:d6000000-d6012800
eth5 Link encap:Ethernet HWaddr 00:10:18:a8:84:86
inet6 addr: fe80::210:18ff:fea8:8486/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:58 errors:0 dropped:0 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:14742 (14.7 KB) TX bytes:2523 (2.5 KB)
Interrupt:45 Memory:d8000000-d8012800
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:639 errors:0 dropped:0 overruns:0 frame:0
TX packets:639 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:46422 (46.4 KB) TX bytes:46422 (46.4 KB)
macvtap0 Link encap:Ethernet HWaddr 52:54:00:8d:e7:e6
inet6 addr: fe80::5054:ff:fe8d:e7e6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:57 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:14074 (14.0 KB) TX bytes:1553 (1.5 KB)
Best Answer
Easiest way to assign NICs to the guest is to leave them unconfigured in the host, and use macvtap passthrough mode for the guest NICs. Mind you, without additional, more complex settings, this will block VM live migration.
Settings:
Or you can go for a full PCI-passthrough mode (provided you have IOMMU/VT-d):