Re: [libvirt] Assigning a static IP to the Linux Container through libvirt.
On Fri, Mar 05, 2010 at 01:05:51PM +0530, Kumar L Srikanth-B22348 wrote:
Hi,
I want to assign a static IP 172.16.1.20 to one of the containers
created using libvirt.
For that, I defined a network 'mynetwork' using net-define. The XML
format for that network is shown below:
The 'net-XXXX' commands are for getting up NAT/routed networking on
the host. The guest is then connected to this network & gets given
an IP from the range assigned.
<network>
<name>mynetwork</name>
<uuid>f76c44dd-bcef-6b45-4a50-00d575a369ad</uuid>
<bridge name='virbr1' stp='on' delay='0' />
<ip address='172.16.1.20' netmask='255.255.255.0'>
</ip>
</network>
This has configured your *host* to have 172.16.1.20, not the container.
I started the network 'mynetwork' using net-start.
virsh # net-list --all
Name State Autostart
-----------------------------------------
default active yes
mynetwork active no
I created a domain 'vm1_fedora' with libvirt XML:
<domain type='lxc' id='1'>
<name>vm1_fedora</name>
<memory>500000</memory>
<os>
<type>exe</type>
<init>/bin/bash</init>
</os>
<vcpu>1</vcpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/libexec/libvirt_lxc</emulator>
<filesystem type='mount'>
<source dir='/root/lxc/fedora12'/>
<target dir='/'/>
</filesystem>
<filesystem type='mount'>
<source dir='/root/lxc/fedora12/dev'/>
<target dir='/dev'/>
</filesystem>
<interface type='network'>
<source network='mynetwork'/>
</interface>
<console type='pty' />
</devices>
</domain>
But, when I start that domain and see for 'ifconfig', I am not able to
see the IP address 172.16.1.20 there.
The libvirt configuration only determines *how* a guest / container is
connected to the host. In this case you've conencted it to the virtual
network 'mynetwork'. It does not do anything to actually configure
the network inside the container - that still needs to be done using the
regular distro initscripts or manual ifconfig inside the container.
[root@localhost /]# ifconfig
eth0 Link encap:Ethernet HWaddr 52:54:00:53:4D:BF
inet6 addr: fe80::5054:ff:fe53:4dbf/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:18 errors:0 dropped:0 overruns:0 frame:0
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:840 (840.0 b) TX bytes:384 (384.0 b)
Inside your container you need to setup the config for eth0 still - it does
not happen automatically
Regards,
Daniel
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