[libvirt] Assigning a static IP to the Linux Container through libvirt.
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: <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> 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. [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) 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: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) can you please let me know, how can I assign a static IP to the Linux Container? Regards, Srikanth.
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 -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
Thanks for the quick response Daniel. If I want to assign IP address automatically through dhcp, I used 'default' network in the domain XML. I am expecting incremental IP's to the containers in the series 192.168.122.*. But, I am not able to get the IP to the container. After I start the container following is the ifconfig details in the host machine: [root@localhost lxc_devel]# ifconfig eth0 Link encap:Ethernet HWaddr 00:50:BF:27:AA:60 inet6 addr: fe80::250:bfff:fe27:aa60/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:78 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 b) TX bytes:11724 (11.4 KiB) Interrupt:21 Base address:0x1140 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:2669 errors:0 dropped:0 overruns:0 frame:0 TX packets:2669 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:434713 (424.5 KiB) TX bytes:434713 (424.5 KiB) veth0 Link encap:Ethernet HWaddr 1A:52:DA:BE:CE:DE inet6 addr: fe80::1852:daff:febe:cede/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:6 errors:0 dropped:0 overruns:0 frame:0 TX packets:16 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:384 (384.0 b) TX bytes:764 (764.0 b) virbr0 Link encap:Ethernet HWaddr 1A:52:DA:BE:CE:DE 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:36 errors:0 dropped:0 overruns:0 frame:0 TX packets:27 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2304 (2.2 KiB) TX bytes:4452 (4.3 KiB) Please let me know. Regards, Srikanth. -----Original Message----- From: Daniel P. Berrange [mailto:berrange@redhat.com] Sent: Friday, March 05, 2010 3:56 PM To: Kumar L Srikanth-B22348 Cc: Reddy B Veera-B22347; libvir-list@redhat.com Subject: Re: 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 -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://deltacloud.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|
participants (2)
-
Daniel P. Berrange -
Kumar L Srikanth-B22348