create vm example by virt-install

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create vm example

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#!/bin/bash
set -e
set -x
ID=$1

BACKFILE_IMG="./ubuntu-20.04-server-cloudimg-amd64.img"
TARGET_IMG="client-${ID}.qcow2"
TARGET_IMG_SIZE="20G"


ADDFILES="http_test"

HOSTNAME="client-${ID}"
IF1_NAME="enp1s0"
IF1_IPADDRESS="11.1.11.$(( 20 + ${ID} ))/24"
IF1_GATEWAY="11.1.11.1"

IF2_NAME="enp2s0"
IF2_IPADDRESS="192.168.122.$(( 30 + ${ID} ))/24"



## create a image from backfile
qemu-img create -f qcow2 -b $BACKFILE_IMG $TARGET_IMG
## resize target image size
qemu-img resize $TARGET_IMG $TARGET_IMG_SIZE

## add user to image
#virt-customize -a ${TARGET_IMG}  --run-command 'useradd lab -s /bin/bash -m -p "" -G sudo ; chage -d 99999 lab'
## set user password
#virt-customize -a ${TARGET_IMG} --password test:password:lab123
## set root password
virt-customize -a ${TARGET_IMG} --root-password password:lab123


## upload http_test and script
http_test_script=$(mktemp /tmp/httpXXXXXXXX.sh)
cat > ${http_test_script} << EOF
#!/bin/bash
set -x
while true
do
  /http_test -c 11.1.10.10 -s 90000000
  sleep  \$(( \$RANDOM % 1 ))
done
EOF
virt-customize -a ${TARGET_IMG} --upload http_test:/http_test
virt-customize -a ${TARGET_IMG} --upload ${http_test_script}:/http.sh
virt-customize -a ${TARGET_IMG} --run-command 'chmod +x /http.sh'

## run script on image on firstboot
script=$(mktemp /tmp/scriptXXXXXXXXXX.sh)
cat > ${script} << EOF
#!/bin/bash
ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -q -N ""
ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -q -N ""
chmod 0600 /etc/ssh/ssh_host*
echo PermitRootLogin yes >> /etc/ssh/sshd_config
sed -i "s/PasswordAuthentication no/PasswordAuthentication yes/g" /etc/ssh/sshd_config
hostnamectl set-hostname ${HOSTNAME}
EOF

virt-customize -a ${TARGET_IMG} --firstboot ${script}
rm -rf ${script}

## create network config file
network_cfg_tmp=$(mktemp /tmp/networkXXXXXXXX.yaml)
cat > ${network_cfg_tmp} << EOF
network:
  ethernets:
    ${IF1_NAME}:
      dhcp4: false
      addresses:
      - ${IF1_IPADDRESS}
      gateway4: ${IF1_GATEWAY}
    ${IF2_NAME}:
      addresses: [ ${IF2_IPADDRESS} ]
  version: 2
EOF

## add network config
virt-customize -a ${TARGET_IMG} --run-command 'rm -rf /etc/netplan/*'
virt-customize -a ${TARGET_IMG} --upload ${network_cfg_tmp}:/etc/netplan/00-installer-config.yaml
rm -rf ${network_cfg_tmp}

### add start script
start_script=$(mktemp /tmp/startXXXXXXXX)

cat > ${start_script} << EOF

[Unit]
Description=start http test
After=network.target

[Service]
ExecStart=bash -c /http.sh
[Install]
WantedBy=multi-user.target
EOF

virt-customize -a ${TARGET_IMG} --upload ${start_script}:/lib/systemd/system/http_test.service
virt-customize -a ${TARGET_IMG} --run-command 'systemctl daemon-reload; systemctl enable http_test'
rm -rf ${start_script}


## boot vm
virt-install \
    --name ${HOSTNAME} \
    --ram=8192 \
    --vcpus 4 \
    --os-type linux \
    --os-variant ubuntu20.04 \
    --graphics none \
    --disk /home/lab/cloud/${TARGET_IMG},device=disk,bus=virtio \
    --network bridge=br11,model=virtio \
    --network bridge=virbr0,model=virtio \
    --noautoconsole \
    --import

resize the disk size

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growpart /dev/vda 1
resize2fs /dev/vda1