cloud-init

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Cloud init guide

ref: https://cloudinit.readthedocs.io/en/latest/topics/examples.html

1. Install tools on the hypervisor machine

1.1 Install kvm qemu virt

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sudo apt install -y qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils virtinst

1.2 Install cloud init tools

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sudo apt install -y cloud-utils

download a cloud image

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wget https://cloud-images.ubuntu.com/releases/focal/release/ubuntu-20.04-server-cloudimg-amd64.img

create a vm image

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qemu-img create -f qcow2 -b ubuntu-20.04-server-cloudimg-amd64.img client.qcow2
qemu-img resize client.qcow2 +10G

create a cloud init file

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cat > cloud-init.yaml << EOF
#cloud-config
hostname: cloudimg.local
user: root
password: lab123
chpasswd: { expire: False }
ssh_pwauth: True
users:
  - name: lab
    shell: /bin/bash
    sudo: ALL=(ALL) NOPASSWD:ALL
    groups: root, sudo
    plain_text_passwd: 'lab123'
    lock_passwd: false
growpart:
  mode: auto
  devices: ['/']
locale: en_US.UTF-8
timezone: Asia/Shanghai
EOF

create network config file

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cat > network.yaml << EOF  
ethernets:
  enp1s0:
    dhcp4: false
    addresses:
    - 11.1.10.12/24
    gateway4: 11.1.10.1
  enp2s0:
    addresses: [ 192.168.122.110/24 ]
    #gateway4: 192.168.122.1
    #nameservers:
    #  addresses: [114.114.114.114]
version: 2
EOF

create the cloud-init iso file

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cloud-localds -m local -N network.yaml cloud-init.iso cloud-init.yaml

boot a vm by virt-install

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virt-install \
    --name vm1 \
    --ram=8192 \
    --vcpus 4 \
    --os-type linux \
    --os-variant ubuntu20.04 \
    --graphics none \
    --disk /home/lab/cloud/client.qcow2,device=disk,bus=virtio \
    --disk /home/lab/cloud/cloud-init.iso,device=cdrom \
    --network bridge=br10,model=virtio \
    --network bridge=virbr0,model=virtio \
    --import