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kvm [2021/05/21 05:30] – [Change network settings] vissiekvm [2023/06/01 00:52] (current) – [Debian] vissie
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 Some network advanced stuff: [[https://www.linuxtechi.com/install-configure-kvm-debian-10-buster/|https://www.linuxtechi.com/install-configure-kvm-debian-10-buster/]] Some network advanced stuff: [[https://www.linuxtechi.com/install-configure-kvm-debian-10-buster/|https://www.linuxtechi.com/install-configure-kvm-debian-10-buster/]]
 <code> <code>
-sudo apt install qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils+ 
 +sudo apt install --no-install-recommends qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils virtinst dnsmasq qemu-utils ovmf 
 +#  Some apps does not get installed with --no-install-recommends and seemds to be added: qemu-utils dnsmasq 
 +# ovmf is for uf
 sudo systemctl status libvirtd.service sudo systemctl status libvirtd.service
 sudo virsh net-list --all sudo virsh net-list --all
 sudo modprobe vhost_net sudo modprobe vhost_net
 +
 </code> </code>
  
Line 17: Line 21:
 sudo virsh net-start default sudo virsh net-start default
 sudo virsh net-autostart default sudo virsh net-autostart default
 +
 </code> </code>
 +
 +=====Stop all iptables rules=====
 +I had issues where these rules were interfering with my iptables manual rules. This worked
 +  So edit your network (virsh net-edit) to <forward mode='open'/>.
 +
 +
  
 If you want to offload the mechanism of “virtio-net” and want to improve the performance of KVM VMs then add “vhost_net” kernel module on your system using the beneath command, If you want to offload the mechanism of “virtio-net” and want to improve the performance of KVM VMs then add “vhost_net” kernel module on your system using the beneath command,
Line 24: Line 35:
 echo "vhost_net" | sudo  tee -a /etc/modules echo "vhost_net" | sudo  tee -a /etc/modules
 lsmod | grep vhost lsmod | grep vhost
 +
 </code> </code>
 <code> <code>
 +
 host_net               24576  0 host_net               24576  0
 vhost                  49152  1 vhost_net vhost                  49152  1 vhost_net
 tap                    28672  1 vhost_net tap                    28672  1 vhost_net
 tun                    49152  2 vhost_net tun                    49152  2 vhost_net
 +
 </code> </code>
 +
 Note: If you want a normal user to use virsh commands then add that user to libvirt and libvirt-qemu group using the following commands Note: If you want a normal user to use virsh commands then add that user to libvirt and libvirt-qemu group using the following commands
 +
 <code> <code>
 sudo adduser pkumar libvirt sudo adduser pkumar libvirt
 sudo adduser pkumar libvirt-qemu sudo adduser pkumar libvirt-qemu
 +
 </code> </code>
 +
 To refresh or reload group membership run the followings, To refresh or reload group membership run the followings,
 +
 <code> <code>
 newgrp libvirt newgrp libvirt
 newgrp libvirt-qemu newgrp libvirt-qemu
 +
 </code> </code>
 +
 +======Setup Bridges Network======
 +  sudo vim /etc/network/interfaces
 +<sxh bash; gutter: false>  
 +# This file describes the network interfaces available on your system
 +
 +source /etc/network/interfaces.d/*
 +
 +# The loopback network interface
 +auto lo
 +iface lo inet loopback
 +
 +# The primary network interface
 +# allow-hotplug enp0s31f6
 +#iface enp0s31f6 inet dhcp
 +#auto enp0s31f6
 +
 +auto br0
 +iface br0 inet dhcp
 +    bridge_ports enp0s31f6
 +    bridge_stp off
 +    bridge_fd 0
 +    bridge_maxwait 0   
 +</sxh>
  
 ====== Allow ping in host====== ====== Allow ping in host======
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 virt-manager virt-manager
 sudo virsh edit debiantesting sudo virsh edit debiantesting
 +sudo virsh undefine paulawin10 ## Kill or destroy a domain
 </code> </code>
  
 +===== Upgrading =====
 +To increase the number of CPUs:
 +  virsh setvcpus <vm_name> <vcpu_count> --config
 +If you get an error that you exceeded the maximum number, first do:
 +  virsh setvcpus <vm_name> <vcpu_count> --config --maximum
 +Then repeat the above:
 +  virsh setvcpus <vm_name> <vcpu_count> --config
 +To increase the memory size:
 +  virsh setmaxmem <vm_name> <memsize> --config
 +  virsh setmem <vm_name> <memsize> --config
 +
 +I'll test this at some point too:
 +  sudo virsh setvcpus --domain test --maximum 2 --config
 +  sudo virsh setvcpus --domain test --count 2 --config
 +  sudo virsh reboot test
 +
 +Please remember to SWITCH OFF the VM, and back on for the changes to take affect.
 +====error: Requested operation is not valid: cannot undefine domain with nvram====
 +<code>sudo virsh undefine --nvram nameofvm</code>
 ===== List all supported os-variants ===== ===== List all supported os-variants =====
 <code> <code>
Line 138: Line 202:
 </code> </code>
  
 +
 +<code>
 +qemu-system-x86_64 \
 +  -boot d \
 +  -cdrom "Bliss-v14.10-x86_64-OFFICIAL-opengapps-20221027.iso" \
 +  -bios /usr/share/ovmf/x64/OVMF.fd \
 +  -nodefaults \
 +  -enable-kvm \
 +  -smp 8 \
 +  -device intel-hda \
 +  -device hda-duplex \
 +  -device virtio-vga-gl \
 +  -net nic \
 +  -net user,hostfwd=tcp::5555-:5555 \
 +  -cpu host \
 +  -m 4096 \
 +  -display sdl,gl=on \
 +  -hda Android.img
 +</code>
 ===== Stop a running domain ===== ===== Stop a running domain =====
 <code> <code>
Line 145: Line 228:
  
 ===== Change network settings ===== ===== Change network settings =====
 +
 To get a list of all domains and ip detail run: To get a list of all domains and ip detail run:
-<code>sudo virsh net-dhcp-leases default</code>+ 
 +<code> 
 +sudo virsh net-dhcp-leases default 
 + 
 +</code> 
 If you need the mac adress, try: If you need the mac adress, try:
-<code>sudo virsh domifaddr viswin10</code> + 
-You can edit network settings by editing the default network with  +<code> 
-<code>sudo virsh net-edit default</code>+sudo virsh domifaddr viswin10 
 + 
 +</code> 
 + 
 +You can edit network settings by editing the default network with 
 + 
 +<code> 
 +sudo virsh net-edit default 
 + 
 +</code> 
 As an example, here are my network settings for my 2 VMs (the lines starting with <host are what you're looking for): As an example, here are my network settings for my 2 VMs (the lines starting with <host are what you're looking for):
 +
 <code> <code>
 <network> <network>
Line 171: Line 271:
   </ip>   </ip>
 </network> </network>
 +
 </code> </code>
-After making the desired changes, run  + 
-<code>sudo virsh net-destroy default && sudo virsh net-start default && sudo systemctl restart libvirtd.service</code>+After making the desired changes, run 
 + 
 +<code> 
 +sudo virsh net-destroy default && sudo virsh net-start default && sudo systemctl restart libvirtd.service 
 + 
 +</code> 
 to restart the network (best done with no VMs running). to restart the network (best done with no VMs running).
 +
 +Or.....
 +
 +
 +<code>sudo virsh net-update default add-last ip-dhcp-host "<host mac='52:54:00:b0:59:5e' name='maurits-cloud' ip='192.168.122.10'/>" --live --config</code>
 +
 +
 +=====Convert=====
 +  qemu-img convert -f vdi -O qcow2 ./Lineage.vdi ./Lineage.qcow2
 +
 +
 ====== GUI ====== ====== GUI ======
  
kvm.1621600212.txt.gz · Last modified: 2021/05/21 05:30 by vissie

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