Difference between revisions of "Kvm vlans"
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The KVM host has only one NIC eth0. This nic will be bridged to br0, and this br0 interface will have the management ip addres of the KVM host: | The KVM host has only one NIC eth0. This nic will be bridged to br0, and this br0 interface will have the management ip addres of the KVM host: | ||
− | + | <pre> | |
# cat ifcfg-eth0 | # cat ifcfg-eth0 | ||
DEVICE="eth0" | DEVICE="eth0" | ||
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BRIDGE=br0 | BRIDGE=br0 | ||
UUID="0f311907-6878-42f3-8974-cecd79ea2f7c" | UUID="0f311907-6878-42f3-8974-cecd79ea2f7c" | ||
− | </pre | + | </pre> |
− | + | <pre> | |
# cat ifcfg-br0 | # cat ifcfg-br0 | ||
DEVICE="br0" | DEVICE="br0" | ||
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NETMASK=255.255.255.0 | NETMASK=255.255.255.0 | ||
GATEWAY=192.168.0.7 | GATEWAY=192.168.0.7 | ||
− | </pre | + | </pre> |
In the coreswitch I have defined some vlans, I join the eth0 port to those vlans as tagged ports (config cisco switch sg 300-10). | In the coreswitch I have defined some vlans, I join the eth0 port to those vlans as tagged ports (config cisco switch sg 300-10). | ||
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back to centos, for every vlan I need to create 2 files, and eth0.vlan_id and a br_vlan_id ifcfg- file. Here examples for vlan 10: | back to centos, for every vlan I need to create 2 files, and eth0.vlan_id and a br_vlan_id ifcfg- file. Here examples for vlan 10: | ||
− | + | <pre> | |
# cat ifcfg-eth0.10 | # cat ifcfg-eth0.10 | ||
DEVICE=eth0.10 | DEVICE=eth0.10 | ||
Line 53: | Line 53: | ||
DELAY=0 | DELAY=0 | ||
− | </pre | + | </pre> |
Add as many of those interfaces as vlan's you need to use. Then restart the network service and you will see this: | Add as many of those interfaces as vlan's you need to use. Then restart the network service and you will see this: | ||
− | + | <pre> | |
# ifconfig | # ifconfig | ||
br_v10 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F | br_v10 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F | ||
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RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) | RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) | ||
− | </pre | + | </pre> |
Use as source for the guest vnic the br_vlanid interface. See [[Kvm_change_guest_vlan| change vm vlan without reboot]] | Use as source for the guest vnic the br_vlanid interface. See [[Kvm_change_guest_vlan| change vm vlan without reboot]] |
Latest revision as of 22:21, 28 August 2015
In order to use vlans in our KVM virtual machines we need to configure the networking stack in the KVM host.
This shows how I have done it in a test lab running centos 6.3.
The KVM host has only one NIC eth0. This nic will be bridged to br0, and this br0 interface will have the management ip addres of the KVM host:
# cat ifcfg-eth0 DEVICE="eth0" HWADDR="00:9C:02:A0:37:8F" IPV6INIT="no" MTU="1500" NM_CONTROLLED="no" ONBOOT="yes" BRIDGE=br0 UUID="0f311907-6878-42f3-8974-cecd79ea2f7c"
# cat ifcfg-br0 DEVICE="br0" TYPE="Bridge" BOOTPROTO="static" IPV6INIT="no" MTU="1500" NM_CONTROLLED="no" ONBOOT="yes" UUID="0f311907-6878-42f3-8974-cecd79ea2f7c" IPADDR=192.168.0.172 NETMASK=255.255.255.0 GATEWAY=192.168.0.7
In the coreswitch I have defined some vlans, I join the eth0 port to those vlans as tagged ports (config cisco switch sg 300-10).
back to centos, for every vlan I need to create 2 files, and eth0.vlan_id and a br_vlan_id ifcfg- file. Here examples for vlan 10:
# cat ifcfg-eth0.10 DEVICE=eth0.10 VLAN=yes ONBOOT=yes BRIDGE=br_v10 cat ifcfg-br_v10 DEVICE=br_v10 TYPE=Bridge BOOTPROTO=static STP=on ONBOOT=yes DELAY=0
Add as many of those interfaces as vlan's you need to use. Then restart the network service and you will see this:
# ifconfig br_v10 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:220918 errors:0 dropped:0 overruns:0 frame:0 TX packets:13 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:10186243 (9.7 MiB) TX bytes:1046 (1.0 KiB) br_v20 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:414 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:38280 (37.3 KiB) TX bytes:468 (468.0 b) br0 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet addr:192.168.0.172 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:434016 errors:0 dropped:0 overruns:0 frame:0 TX packets:376825 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:55048227 (52.4 MiB) TX bytes:155770837 (148.5 MiB) eth0 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:314021 errors:0 dropped:0 overruns:0 frame:0 TX packets:313169 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:47985625 (45.7 MiB) TX bytes:118658184 (113.1 MiB) Interrupt:18 eth0.10 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5781 errors:0 dropped:0 overruns:0 frame:0 TX packets:6975 errors:0 dropped:3 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:368596 (359.9 KiB) TX bytes:430381 (420.2 KiB) eth0.20 Link encap:Ethernet HWaddr 00:9C:02:A0:37:8F inet6 addr: fe80::29c:2ff:fea0:378f/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1812 errors:0 dropped:0 overruns:0 frame:0 TX packets:7790 errors:0 dropped:4 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:213612 (208.6 KiB) TX bytes:860334 (840.1 KiB) 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:37818 errors:0 dropped:0 overruns:0 frame:0 TX packets:37818 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:55946604 (53.3 MiB) TX bytes:55946604 (53.3 MiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:0E:BA:27 inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Use as source for the guest vnic the br_vlanid interface. See change vm vlan without reboot