新建一个libvirt的nat网络virbr1-nic

首先virsh和brctl都是需要安装libvirt才有这两个命令

yum install libvirt -y
systemctl start libvirtd
           

[[email protected] ~]# cat testxml
<network>
  <name>test</name>  #这里修改
  <uuid>168f6909-715c-4333-a34b-f74584d26328</uuid>  #这里修改
  <forward mode='nat'/>  
  <bridge name='virbr1' stp='on' delay='0'/>  #这里修改
  <mac address='52:54:00:48:3f:0c'/>  #这里修改
  <ip address='192.168.123.1' netmask='255.255.255.0'> #这里修改
    <dhcp>
      <range start='192.168.123.2' end='192.168.123.254'/> #这里修改
    </dhcp>
  </ip>
</network>
[[email protected] ~]#
           

[[email protected] ~]# virsh net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes

[[email protected] ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.525400e93e9c       yes             virbr0-nic
           

[[email protected] ~]# virsh net-list --  #自动补全，看到如下的参数，安装了bash-completion和bash-completion-extras的用途
--all           --inactive      --no-autostart  --table         --uuid
--autostart     --name          --persistent    --transient
[[email protected] ~]#
           

[[email protected] ~]# virsh net-define testxml
Network test defined from testxml

[[email protected] ~]# virsh net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes

[[email protected] ~]# virsh net-list --all
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes
 test                 inactive   no            yes

[[email protected] ~]# virsh net-autostart test
Network test marked as autostarted
           

[[email protected] ~]# brctl show
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.525400e93e9c       yes             virbr0-nic
[[email protected] ~]# virsh net-start test
Network test started

[[email protected] ~]# virsh net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              active     yes           yes
 test                 active     yes           yes

[[email protected] ~]# brctl show #可以看到第二个nat已经完成
bridge name     bridge id               STP enabled     interfaces
virbr0          8000.525400e93e9c       yes             virbr0-nic
virbr1          8000.525400483f0c       yes             virbr1-nic
           

[[email protected] ~]# ip -4 a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    inet 192.168.0.32/24 brd 192.168.0.255 scope global noprefixroute dynamic ens33
       valid_lft 5696sec preferred_lft 5696sec
4: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
6: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    inet 192.168.123.1/24 brd 192.168.123.255 scope global virbr1
       valid_lft forever preferred_lft forever
[[email protected] ~]#
           

参考

• 建立nat参考：https://kashyapc.fedorapeople.org/virt/create-a-new-libvirt-bridge.txt
• 桥接和nat参考：https://linuxconfig.org/how-to-use-bridged-networking-with-libvirt-and-kvm

版本

• 2022-11-21 第一版