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add docs/posts/add-kvm-network-with-virsh.md

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---
title: "Add KVM Network With Virsh"
date: 2021-10-16
draft: false
tags: ["linux", "kvm", "libvirt", "virsh"]
authors: ["trent"]
post: 25
---
date: 2021-10-16
## Introduction
This is a short and sweet walk-through for how to create
a new network for `libvirt` for `kvm`, from the command line,
using `virsh`.
## Name Resolution
Let's start with name resolution.
* Install `libnss-libvirt`:
```shell
apt install libnss-libvirt
```
* In `/etc/nsswitch.conf`, add `libvirt` to hosts key.
```cfg
# /etc/nsswitch.conf
# change this
...
hosts: files dns mymachines
...
# to this
...
hosts: files libvirt dns mymachines
...
```
## Starter XML
You could dumpxml on the existing _default_ network:
```shell
virsh net-dumpxml default > foonet.xml
```
Then, edit foonet.xml:
* remove the network uuid
* change the network name to taste
* remove the bridge mac
* change the bridge name to taste
* change the bridge ip address and dhcp range to taste
```xml
<!-- foonet.xml -->
<network>
<name>foonet</name>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr101' stp='on' delay='0'/>
<ip address='10.55.44.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.55.44.2' end='10.55.44.254'/>
</dhcp>
</ip>
</network>
```
## Define The Network
With the above xml file: `virsh net-define foonet.xml`
The network definition can now be found in `/etc/libvirt/qemu/networks/foonet.xml`
```xml
<!-- /etc/libvirt/qemu/networks/foonet.xml -->
<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made using:
virsh net-edit foonet
or other application using the libvirt API.
-->
<network>
<name>foonet</name>
<uuid>e6e40bfc-d449-4043-924c-ca0f0edf4210</uuid>
<forward mode='nat'>
<nat>
<port start='1024' end='65535'/>
</nat>
</forward>
<bridge name='virbr111' stp='on' delay='0'/>
<mac address='52:54:00:49:a7:f8'/>
<ip address='10.55.44.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.55.44.2' end='10.55.44.254'/>
</dhcp>
</ip>
</network>
```
You could also start the network without defining it
using `virsh net-create foonet.xml`.
## Start/Stop
* Start the network
* `virsh net-start foonet`
* Stop the network
* `virsh net-destroy foonet`
* Undefine the network
* `virsh net-undefine foonet`
* Autostart the network
* `virsh net-autostart foonet`
* Disable autostart for the network
* `virsh net-autostart foonet --disable`
Tab completion is you friend!

2
mkdocs.yml
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@ -24,6 +24,7 @@ markdown_extensions:
nav:
- Home:
- Home: index.md
- "Add KVM Network With Virsh": posts/add-kvm-network-with-virsh.md
- "KVM On Arch": posts/kvm-on-arch.md
- "RaspberryPi LTE-Failover Router With DNS Caching": posts/raspberrypi-lte-failover-router-with-dns-caching.md
- "Flutter Integration Test Server in Debian 11 Nspawn Container": posts/debian-11-nspawn-flutter-integration-test-server.md
@ -62,6 +63,7 @@ nav:
- FreeCodeCampChallenges: https://trentspalmer.github.io/fcc-challenges/
- DeviceLayout: https://trentpalmer.work/6a57bbe24d8244289610bf57533d6c6f/
- Posts:
- "Add KVM Network With Virsh": posts/add-kvm-network-with-virsh.md
- "KVM On Arch": posts/kvm-on-arch.md
- "RaspberryPi LTE-Failover Router With DNS Caching": posts/raspberrypi-lte-failover-router-with-dns-caching.md
- "Flutter Integration Test Server in Debian 11 Nspawn Container": posts/debian-11-nspawn-flutter-integration-test-server.md