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Libvirt wrapper to spawn VMs using cloud images

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kayrus/deploy-vm

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sudo apt-get install -y libvirt-bin virtinst qemu-kvm virt-manager git wget genisoimagesudo service libvirt-bin start

For the Windows VM support installbsdtar (this tool allows to extract zip archive from stdin):

sudo apt-get install bsdtar

Install on Fedora/CentOS

sudo yum install -y libvirt virt-install qemu-kvm virt-manager git wget genisoimage NetworkManagersudo service libvirtd start

For the Windows VM support installbsdtar (this tool allows to extract zip archive from stdin):

sudo yum install bsdtar

This string inside your~/.profile will allow you to usevirsh:

export LIBVIRT_DEFAULT_URI=qemu:///system

Configure local resolver to use libvirt's dnsmasq

  • Ubuntu 18.04 (systemd-resolved(c))

The setting below is not preserved on reboot:

systemd-resolve --set-dns=192.168.122.1 --set-domain=vm --interface=virbr0

Verify:

systemd-resolve --status virbr0

Add the following section into libvirt default network (sudo virsh net-edit default):

  <domainname='vm'localOnly='yes'/>

And restart the network:

sudo virsh net-destroy defaultsudo virsh net-start default
  • Ubuntu/Debian
virsh net-dumpxml default| sed -r":a;N;\$!ba;s#.*address='([0-9.]+)'.*#nameserver \1#"| sudo tee -a /etc/resolvconf/resolv.conf.d/head&& sudo resolvconf -u
  • Fedora/CentOS
sudo systemctlenable NetworkManagerecho -e"[main]\ndns=dnsmasq"| sudo tee -a /etc/NetworkManager/NetworkManager.confvirsh net-dumpxml default| sed -r":a;N;\$!ba;s#.*address='([0-9.]+)'.*#server=\1\nall-servers#"| sudo tee /etc/NetworkManager/dnsmasq.d/libvirt_dnsmasq.confsudo systemctl restart NetworkManager

Add current user intolibvirt group (will allow you to run scripts withoutsudo)

sudo usermod -aG libvirtd$USER# for Debian/Ubuntu14.04/Ubuntu16.04sudo usermod -aG libvirt$USER# for CentOS/Fedora/Ubuntu18.04

NOTE: You have to relogin into your UI environment to apply these changes.

Allow libvirt to read VMs images in your home directory

ACL solution

Add permissions

setfacl -m"u:libvirt-qemu:--x"$HOME# for Debian/Ubuntusetfacl -m"u:qemu:--x"$HOME# for CentOS/Fedora

Remove permissions

Remove ACL entries only for libvirt
setfacl -m"u:libvirt-qemu:---"$HOME# for Debian/Ubuntusetfacl -m"u:qemu:---"$HOME# for CentOS/Fedora
Remove all custom ACL entries
setfacl -b$HOMEgetfacl$HOME

Groups solution

Add permissions

sudo usermod -aG$USER libvirt-qemu# for Debian/Ubuntusudo usermod -aG$USER qemu# for CentOS/Fedorachmod g+x$HOME

Remove permissions

sudo usermod -G"" libvirt-qemu# for Debian/Ubuntusudo usermod -G"kvm" qemu# for CentOS/Fedorachmod g-x$HOME

Configure virsh environment

echo"export LIBVIRT_DEFAULT_URI=qemu:///system">>~/.bashrc

Configure ~/.ssh/config

cat dot_ssh_config>>~/.ssh/configchmod 600~/.ssh/config

Run Flatcar VMs cluster of 3 nodes

./deploy_flatcar_cluster.sh -s 3

user_data file works only for Flatcar and contains a template for Flatcar configuration and it configuresetcd2 andfleet.

Try out Tectonic

Create Tectonoic credentials files:

  • tectonic.lic # raw base64 encoded licence
  • docker.cfg # raw base64 encoded dockercfg

Deploy cluster:

./deploy_k8s_cluster.sh --tectonic

Enter your Kubernetes master node:

ssh core@k8s-master# [-i ~/.ssh/id_rsa]

Get Tectonicadmin@example.com password:

kubectl --namespace=tectonic-system get secret tectonic-identity-admin-password -o template --template="{{.data.password}}"| base64 -d&&echo

Login Tectonic:

https://k8s-master:32000

Username:admin@example.comPassword: see above

Run other VMs

Linux

Run three CentOS VMs

./deploy_vms_cluster.sh -o centos -s 3

Windows

Run one Windows IE11.Win7 VM

./deploy_vms_cluster.sh -o windows -r IE11.Win7 -m 1024 -u 2

FreeBSD guest (experimental)

Download and run FreeBSD:

./deploy_vms_cluster.sh -o freebsd# for 10.3 RELEASE./deploy_vms_cluster.sh -o freebsd -c 11.0 -r RC1# for 11.0 RC1

FreeBSD QEMU images don't supportcloud-init, so you have to configure network and ssh manually through the console:

dhclient vtnet0echo'sshd_enable=YES'>> /etc/rc.confecho'ifconfig_DEFAULT=DHCP'>> /etc/rc.confecho'PermitRootLogin yes'>> /etc/ssh/sshd_configservice sshd startpasswd

FreeBSD host (experimental)

pkg install bash wget bzip2 gnupg cdrtools libvirt qemu virt-managerkldload vmmlibvirtd -difconfig tap createifconfig bridge createifconfig bridge0 addm tap0 up

virt-install version > 1.4 should use following parameters:

--nographic \--console nmdm,source.master=/dev/nmdm0A,source.slave=/dev/nmdm0B \--network bridge=bridge0 \

and without--vnc flag. VNC flag produces following XML:

<graphicstype="vnc"port="-1"keymap="en-us"/>

which causesinternal error: cannot determine default video type error message.

Completely destroy and remove all related VMs cluster data

./remove_cluster.sh flatcar

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