Virsh net-edit

Internal

• virsh
• Virtual Network Concepts
• Linux Virtualization Operations
• virsh net-update

Overview

Used to edit the configuration of the specified virtual network.

virsh net-edit <virtual-network-name>

The command brings the specified network configuration in the default editor, allowing it to be edited:

<network>
  <name>default</name>
  <uuid>49a07631-ea20-4741-89ea-b0faa7b42d19</uuid>
  <forward mode='nat'/>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:15:ef:87'/>
  <ip address='192.168.122.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
    </dhcp>
  </ip>
</network>

Configuration changes applied with virsh net-edit modify the following:

• DNS and DHCP server's (dnsmasq) configuration file /var/lib/libvirt/dnsmasq/default.conf.

Changes applied with virsh net-edit won't take effect until the network is destroyed and re-started, which will cause a all guests to lose network connectivity with the host until their network interfaces are explicitly re-attached. If we need to avoid losing connectivity, changes may also be applied with virsh net-update.

Operations

Modify DHCP Range

Execute

virsh net-edit <virtual-network-name>

and modify the following section:

...
<dhcp>
    <range start='192.168.122.2' end='192.168.122.254'/>
</dhcp>
...

Upon save, libvirt will update DNS and DHCP server's (dnsmasq) configuration file /var/lib/libvirt/dnsmasq/default.conf.