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https://github.com/kayrus/deploy-vm

Libvirt wrapper to spawn VMs using cloud images
https://github.com/kayrus/deploy-vm

centos cloud-image cloud-init coreos freebsd kvm libvirt ubuntu

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Libvirt wrapper to spawn VMs using cloud images

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## Install libvirt on Ubuntu



```sh

sudo apt-get install -y libvirt-bin virtinst qemu-kvm virt-manager git wget genisoimage

sudo service libvirt-bin start

```



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



```sh

sudo apt-get install bsdtar

```



## Install on Fedora/CentOS



```sh

sudo yum install -y libvirt virt-install qemu-kvm virt-manager git wget genisoimage NetworkManager

sudo service libvirtd start

```



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



```sh

sudo yum install bsdtar

```



This string inside your `~/.profile` will allow you to use `virsh`:



```sh

export LIBVIRT_DEFAULT_URI=qemu:///system

```



## Configure local resolver to use libvirt's dnsmasq



* Ubuntu 18.04 (`systemd-resolved` [(c)](https://wiki.ubuntu.com/SecurityTeam/TestingEnvironment#Tell_systemd-resolved_to_use_libvirt.27s_dnsmasq_for_VMs_only_.2817.04.2B-.29))



The setting below is not preserved on reboot:



```sh

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

```



Verify:



```sh

systemd-resolve --status virbr0

```



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



```xml

  

```



And restart the network:



```sh

sudo virsh net-destroy default

sudo virsh net-start default

```



* Ubuntu/Debian



```sh

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



```sh

sudo systemctl enable NetworkManager

echo -e "[main]\ndns=dnsmasq" | sudo tee -a /etc/NetworkManager/NetworkManager.conf

virsh net-dumpxml default | sed -r ":a;N;\$!ba;s#.*address='([0-9.]+)'.*#server=\1\nall-servers#" | sudo tee /etc/NetworkManager/dnsmasq.d/libvirt_dnsmasq.conf

sudo systemctl restart NetworkManager

```



## Add current user into `libvirt` group (will allow you to run scripts without `sudo`)



```sh

sudo usermod -aG libvirtd $USER # for Debian/Ubuntu14.04/Ubuntu16.04

sudo 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



```sh

setfacl -m "u:libvirt-qemu:--x" $HOME # for Debian/Ubuntu

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

```



#### Remove permissions



##### Remove ACL entries only for libvirt



```sh

setfacl -m "u:libvirt-qemu:---" $HOME # for Debian/Ubuntu

setfacl -m "u:qemu:---" $HOME # for CentOS/Fedora

```



##### Remove all custom ACL entries



```sh

setfacl -b $HOME

getfacl $HOME

```



### Groups solution



#### Add permissions



```sh

sudo usermod -aG $USER libvirt-qemu # for Debian/Ubuntu

sudo usermod -aG $USER qemu # for CentOS/Fedora

chmod g+x $HOME

```



#### Remove permissions



```sh

sudo usermod -G "" libvirt-qemu # for Debian/Ubuntu

sudo usermod -G "kvm" qemu # for CentOS/Fedora

chmod g-x $HOME

```



## Configure virsh environment



```sh

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

```



## Configure ~/.ssh/config



```sh

cat dot_ssh_config >> ~/.ssh/config

chmod 600 ~/.ssh/config

```



## Run Flatcar VMs cluster of 3 nodes



```sh

./deploy_flatcar_cluster.sh -s 3

```



`user_data` file works only for Flatcar and contains a template for Flatcar configuration and it configures `etcd2` and `fleet`.



## Try out Tectonic



Create Tectonoic credentials files:



* `tectonic.lic` # raw base64 encoded licence

* `docker.cfg` # raw base64 encoded dockercfg



Deploy cluster:



```sh

./deploy_k8s_cluster.sh --tectonic

```



Enter your Kubernetes master node:



```sh

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

```



Get Tectonic `[email protected]` password:



```sh

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

```



Login Tectonic:



[https://k8s-master:32000](https://k8s-master:32000)



Username: `[email protected]`

Password: see above



## Run other VMs



### Linux



Run three CentOS VMs



```sh

./deploy_vms_cluster.sh -o centos -s 3

```



### Windows



Run one Windows IE11.Win7 VM



```sh

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

```



### FreeBSD guest (experimental)



Download and run FreeBSD:



```sh

./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 support `cloud-init`, so you have to configure network and ssh manually through the console:



```sh

dhclient vtnet0

echo 'sshd_enable=YES' >> /etc/rc.conf

echo 'ifconfig_DEFAULT=DHCP' >> /etc/rc.conf

echo 'PermitRootLogin yes' >> /etc/ssh/sshd_config

service sshd start

passwd

```



## FreeBSD host (experimental)



```sh

pkg install bash wget bzip2 gnupg cdrtools libvirt qemu virt-manager

kldload vmm

libvirtd -d

ifconfig tap create

ifconfig bridge create

ifconfig bridge0 addm tap0 up

```



virt-install version > 1.4 should use following parameters:



```sh

--nographic \

--console nmdm,source.master=/dev/nmdm0A,source.slave=/dev/nmdm0B \

--network bridge=bridge0 \

```



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



```xml



```



which causes `internal error: cannot determine default video type` error message.



## Completely destroy and remove all related VMs cluster data



```sh

./remove_cluster.sh flatcar

```