Ubuntu uvtool : how to use a template and use-data(cloud init)

Here are samples on how to use a template and user-data with uvt-kvm.

When you create a VM as below, the VM will belong to “default” network.

$ uvt-kvm create --password=hello test01

user name : ubuntu

credentials : hello

$ virsh dumpxml test01    <interface type='network'>      <mac address='52:54:00:fc:3c:56'/>      <source network='default' bridge='virbr0'/>      <target dev='vnet0'/>      <model type='virtio'/>      <alias name='net0'/>      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>    </interface>

When you create a VM without specifying a template, uvt-kvm will create a VM by using a “template.xml”

$ pwd /usr/share/uvtool/libvirt $ ls remote-wait.sh  template.xml

If you want to customize a network which a VM belongs to, you can change that by using a template.

$ cat template02.xml <domain type='kvm'>  <os>    <type>hvm</type>    <boot dev='hd'/>  </os>  <features>    <acpi/>    <apic/>    <pae/>  </features>  <devices>    <interface type='network'>      <source network='default'/>      <model type='virtio'/>    </interface>    <interface type='network'>      <source network='a-net'/>      <model type='virtio'/>    </interface>    <interface type='network'>      <source network='b-net'/>      <model type='virtio'/>    </interface>    <serial type='pty'>      <source path='/dev/pts/3'/>      <target port='0'/>    </serial>    <graphics type='vnc' autoport='yes' listen='127.0.0.1'>      <listen type='address' address='127.0.0.1'/>    </graphics>    <video/>  </devices> </domain>

$ uvt-kvm create --password=hello --template=./template02.xml --cpu 1 --disk 5 test02

[ user-data ]

Assign static IP addresses.

$ cat user-data #cloud-config ssh_pwauth: yes chpasswd:  list: |    ubuntu:hello  expire: False write_files: #  - path: /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg #    owner: root:root #    permissions: '0644' #    content: | #      network: {config: disabled}  - path: /etc/network/interfaces.d/50-cloud-init.cfg    owner: root:root    permissions: '0644'    content: |      auto ens3      iface ens3 inet dhcp      auto ens4      iface ens4 inet static      address 192.168.130.120      netmask 255.255.255.0      auto ens5      iface ens5 inet static      address 192.168.131.120      netmask 255.255.255.0 power_state:  mode: reboot

$ uvt-kvm create --user-data=./user-data --template=./template02.xml --cpu 1 --disk 5 test05

$ uvt-kvm ip test05 192.168.122.34 $ ssh ubuntu@192.168.122.34 ubuntu@ubuntu:~$ ip a s | grep 192    inet 192.168.122.34/24 brd 192.168.122.255 scope global ens3    inet 192.168.130.120/24 brd 192.168.130.255 scope global ens4    inet 192.168.131.120/24 brd 192.168.131.255 scope global ens5 ubuntu@ubuntu:~$