5:57 a.m.
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.
8:52 a.m.
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
1:02 p.m.
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
5:55 p.m.
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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libvirt-users(a)redhat.com
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--
Doug Hughes
Keystone NAP
Fairless Hills, PA
1.844.KEYBLOCK (539.2562)
6:21 p.m.
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
2475
days inactive
2475
days old
4 comments
5 participants
participants (5)
-
Andrea Bolognani -
Doug Hughes -
Sam Varshavchik -
scar -
Tony Brian Albers