[libvirt-users] public IP for VM
I can't seem to figure out how to setup a public IP for the VM so we could use it as a second public webserver. The host machine runs our primary webserver with CentOS 6.9 and one public ipv4 address configured on physical interface eth0. Now i have configured a new bridge interface br0: DEVICE=br0 TYPE=Bridge BOOTPROTO=static The IP settings are for a second public ipv4 address in the same network. Now i setup the VM to use br0 for the NIC and set the same IP settings inside the VM... but it doesn't work. The VM can't resolve any hosts, and if i try to ssh to the second public IP, it just sends me to the host machine instead of the VM.
On 12/07/2017 05:57 AM, scar wrote:
I can't seem to figure out how to setup a public IP for the VM so we could use it as a second public webserver. The host machine runs our primary webserver with CentOS 6.9 and one public ipv4 address configured on physical interface eth0. Now i have configured a new bridge interface br0: DEVICE=br0 TYPE=Bridge BOOTPROTO=static
The IP settings are for a second public ipv4 address in the same network. Now i setup the VM to use br0 for the NIC and set the same IP settings inside the VM... but it doesn't work. The VM can't resolve any hosts, and if i try to ssh to the second public IP, it just sends me to the host machine instead of the VM.
Try using macvtap instead. A bridge is more like an internal software-based switch, it's not really a NIC. /tony -- Tony Albers Systems administrator, IT-development Royal Danish Library, Victor Albecks Vej 1, 8000 Aarhus C, Denmark. Tel: +45 2566 2383 / +45 8946 2316
scar writes:
I can't seem to figure out how to setup a public IP for the VM so we could use it as a second public webserver. The host machine runs our primary webserver with CentOS 6.9 and one public ipv4 address configured on physical interface eth0. Now i have configured a new bridge interface br0: DEVICE=br0 TYPE=Bridge BOOTPROTO=static
The IP settings are for a second public ipv4 address in the same network. Now i setup the VM to use br0 for the NIC and set the same IP settings inside the VM... but it doesn't work. The VM can't resolve any hosts, and if i try to ssh to the second public IP, it just sends me to the host machine instead of the VM.
Do you have BRIDGE=br0 In the ifcfg file for your host's network interface, with only its first, primary, IP address? Also my bridge configuration has ONBOOT=yes
Here's how I do it.. I have a VM host and a bunch of VM guests on it. Most of those guest VMS are in the same vlan as the host, which works fine with bridge. Some are in tagged vlans, but you didn't ask about that. from the guest perspective, here's an example from the .xml <interface type='network'> <mac address='52:54:00:b0:98:0b'/> <source network='default'/> <model type='rtl8139'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> </interface> host: [root@vm2 qemu]# cat networks/default.xml <!-- WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE OVERWRITTEN AND LOST. Changes to this xml configuration should be made using: virsh net-edit default or other application using the libvirt API. --> /etc/libvirt/qemu/networks/default.xml: <network> <name>default</name> <uuid>57f11311-c17e-4550-8450-bea1c69d36cc</uuid> <forward mode='bridge'/> <bridge name='br0'/> </network> host (centos) /etc/sysconfig/network-scripts/ifcfg-br0: (note br0 uses em0 on the hardware exclusively) DEVICE="br0" NAME="br0" ONBOOT="yes" BOOTPROTO="none" HWADDR=c8:1f:66:e3:de:58 IPADDR=10.0.2.36 NETMASK=255.255.255.0 DEFROUTE="yes" GATEWAY=10.0.2.1 TYPE="bridge" # virsh virsh # net-list Name State Autostart Persistent ---------------------------------------------------------- default active yes yes virsh # net-info default Name: default UUID: 57f11311-c17e-4550-8450-bea1c69d36cc Active: yes Persistent: yes Autostart: yes Bridge: br0 a guest (centos) /etc/sysconfig/network-scripts/ifcfg-eth0: TYPE=Ethernet BOOTPROTO=static HWADDR=52:54:00:6f:f7:85 USERCTL=no IPADDR=10.0.2.27 NETMASK=255.255.255.0 GATEWAY=10.0.2.1 DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=no NAME=eth0 DEVICE=eth0 ONBOOT=yes DNS1=8.8.8.8 DNS2=8.8.4.4 DOMAIN=foo.bar UUID=8c4d5363-3bea-409f-8965-f2db432a6853 On 12/6/2017 11:57 PM, scar wrote:
I can't seem to figure out how to setup a public IP for the VM so we could use it as a second public webserver. The host machine runs our primary webserver with CentOS 6.9 and one public ipv4 address configured on physical interface eth0. Now i have configured a new bridge interface br0: DEVICE=br0 TYPE=Bridge BOOTPROTO=static
The IP settings are for a second public ipv4 address in the same network. Now i setup the VM to use br0 for the NIC and set the same IP settings inside the VM... but it doesn't work. The VM can't resolve any hosts, and if i try to ssh to the second public IP, it just sends me to the host machine instead of the VM.
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-- Doug Hughes Keystone NAP Fairless Hills, PA 1.844.KEYBLOCK (539.2562)
On Thu, 2017-12-07 at 11:55 -0500, Doug Hughes wrote: [...]
from the guest perspective, here's an example from the .xml <interface type='network'> <mac address='52:54:00:b0:98:0b'/> <source network='default'/> <model type='rtl8139'/>
As a side note, you should only use rtl8139 if your guest OS literally can't be convinced to work with anything else. -- Andrea Bolognani / Red Hat / Virtualization
participants (5)
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Andrea Bolognani -
Doug Hughes -
Sam Varshavchik -
scar -
Tony Brian Albers