kvm-网络操作:创建、关闭、开启、删除

1、基础知识

1.1、需求

如果我们不想用默认的网络的话，可以自己定义一个专用的网络。

1.2、命令解析

1.2.1、创建网络

临时：virsh net-create <xml配置文件>
永久：virsh net-define <xml配置文件>

1.2.2、关闭网络

virsh net-destroy <网络名称> 

1.2.3、开启网络

virsh net-start <网络名称>

1.2.4、删除网络

virsh net-undefine <网络名称> 

2、实战

2.1、创建临时网络

2.1.1、复制default网络配置

cd /etc/libvirt/qemu/networks && cp default.xml copy_nat.xml

2.1.2、修改copy_nat.xml配置

cat << 'CAT_END' > copy_nat.xml
<network>
  <name>copy_nat</name>
  <uuid>178c4147-c955-4252-827d-202305221002</uuid>
  <forward mode='nat'/>
  <bridge name='virbr1' stp='on' delay='0'/>
  <mac address='52:54:00:eb:07:53'/>
  <ip address='192.168.123.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.123.2' end='192.168.123.254'/>
    </dhcp>
  </ip>
</network>
CAT_END

2.1.3、创建临时网络

virsh net-create /etc/libvirt/qemu/networks/copy_nat.xml 

2.1.4、查看效果

# virsh net-list --transient
 Name       State    Autostart   Persistent
---------------------------------------------
 copy_nat   active   no          no

2.2、创建永久网络

2.2.1、复制default网络配置

cd /etc/libvirt/qemu/networks && cp default.xml copy_nat_keep.xml

2.2.2、修改copy_nat.xml配置

cat << 'CAT_END' > copy_nat_keep.xml
<network>
  <name>copy_nat_keep</name>
  <uuid>178c4147-c955-4252-827d-202305221006</uuid>
  <forward mode='nat'/>
  <bridge name='virbr2' stp='on' delay='0'/>
  <mac address='52:54:00:eb:07:54'/>
  <ip address='192.168.124.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.124.2' end='192.168.124.254'/>
    </dhcp>
  </ip>
</network>
CAT_END

2.2.3、创建永久网络

virsh net-define /etc/libvirt/qemu/networks/copy_nat_keep.xml 

2.2.4、查看效果

# virsh net-list --persistent --all
 Name            State      Autostart   Persistent
----------------------------------------------------
 copy_nat_keep   inactive   no          yes
 default         active     yes         yes

2.3、开启网络

# virsh net-start copy_nat_keep
Network copy_nat_keep started

# virsh net-list --persistent --all
 Name            State    Autostart   Persistent
--------------------------------------------------
 copy_nat_keep   active   no          yes
 default         active   yes         yes

2.4、关闭网络

# virsh net-destroy copy_nat_keep
Network copy_nat_keep destroyed

# virsh net-list --persistent --all
 Name            State      Autostart   Persistent
----------------------------------------------------
 copy_nat_keep   inactive   no          yes

2.5、删除网络

# 注意：删除网络需要有两步：关闭网络+取消注册

# 关闭网络
ls /etc/libvirt/qemu/networks
virsh net-destroy copy_nat_keep
ifconfig

# 取消注册
virsh net-undefine copy_nat_keep
virsh net-list --all