VM Notes

vm_notes.md

Sane, modern setup

Bridge is a waste of time: Use the successor macvtap / macvlan "Direct Connect". The only downside is you cannot see the vm host from a vm.

Cockpit Setup for VM Host.

1. Download your ubuntu iso and copy to /opt/. Cockpit will error if it's in your /home/.
2. sudo apt install cockpit cockpit-machines
3. Want to use Direct Attachment? (no bridge)
   • Prevent bridge device creation on startup. (Auto-generated by virsh)
     • virsh net-destroy default
     • virsh net-undefine default
   • Direct Attachment has best performance: Downside is host machine and VM's cannot see each other on LAN.
     • This is okay anyway for security.
     • Host machine can still use VM tools for access.
4. Cockpit: localhost:9090
5. ⚠️ Remember to use your firewall to block 9090!
6. Virtual Machines ➡️ Create VM ➡️ Immediately Start VM: OFF
7. Click on VM. ➡️ Delete default network interface. ➡️ Add networking interface. ➡️ Direct Attachment. ➡️ Source main device. ➡️ Add.
8. Install.

Recommended Cockpit Add-ons

• Navigator
  • wget https://github.com/45Drives/cockpit-navigator/releases/download/v0.5.10/cockpit-navigator_0.5.10-1focal_all.deb
  • sudo apt install ./cockpit-navigator_0.5.10-1focal_all.deb
• sudo apt install cockpit-podman

Legacy Notes

https://www.youtube.com/watch?v=6435eNKpyYw

• Bridge is just a virtual switch.
• Bridge becomes the new main interface.
• All VM's and the host itself use the Bridge.

Auto Setup Using systemd

• sudo su
• cd /etc/systemd/network/
• nano br.netdev

[NetDev]
Name=br0
Kind=bridge

• nano 1-br0-bind.network

[Match]
Name=en*
[Network]
Bridge=br0

• nano 2-br0-dhcp.network

[Match]
Name=br0
[Network]
DHCP=ipv4

• systemctl enable systemd-networkd --now
• ip link set eno1 down
• ip a
• journalctl -f -u systemd-networkd

For netplan: https://github.com/canonical/netplan/blob/main/examples/bridge.yaml

Random Notes

General ip command notes.

* Add a device: `ip link add ...`
* Remove a device: `ip link delete dev ...`
* Set ipv4 address for device: `ip -4 address add x.x.x.x/32 dev ...`

Backing up KVM data.

* /var/lib/libvirt/qemu/snapshot
* /var/lib/libvirt/images

Not cockpit, such as virt-manager or other kvm thing

* Bridge Network
	1. sudo ip link add name br0 type bridge
	2. sudo ip link set dev br0 up
	3. sudo ip link set eno1 master br0; sudo dhclient br0
* VM Manager
	* sudo apt install virt-manager
	* sudo ip link del name virbr0
		* Removes default virt-manager bridge (uses 192...)
* Survive Reboot
	* systemd: https://wiki.archlinux.org/title/Systemd-networkd#Bridge_interface
	* Or, put the above in a startup script.
* Notes
	* https://wiki.archlinux.org/title/network_bridge
	* https://man7.org/linux/man-pages/man8/ip-link.8.html
* Remove
	* sudo ip link set dev eno1 nomaster