Creating a QCOW2 Image for a cVM

This section describes how to create a QCOW2 image, which is required for starting a cVM.

1. Install the dependencies.

   yum install dnf-plugins-core grub2-efi-aa64-modules libguestfs-tools qemu-img virt-install guestfs-tools cloud-utils-growpart nbdkit ncurses-devel openssl-devel elfutils-libelf-devel dwarves
   yum groupinstall "Development Tools"

2. Pull the script file.

   git clone https://gitee.com/openeuler/virtCCA_sdk.git
   cd virtCCA_sdk/cvm-image-rewriter/

3. Check that libvirtd is installed and start it. For details about how to install libvirtd, see Deploying libvirt.

   systemctl start libvirtd

4. After the libvirtd startup process is complete, check the libvirtd status. If the status is "active (running)", libvirtd has been started successfully.

   systemctl status libvirtd

   

5. After executing the create-oe-image.sh script, a QCOW2 image and the cVM image measurement baseline value file image_reference_measurement.json are generated in the current script directory.

   export LIBGUESTFS_BACKEND=direct
   sh create-oe-image.sh -v 24.03-LTS-SP2  -s 10

   The create-oe-image.sh script supports two modes: image creation mode and measurement mode. Table 1 describes the parameters.

   Table 1 Parameters for the two modes

   Script Mode	Parameter	Description
   Image creation mode	-v	Version number.
   	-p	Sets the root password for the image.
   	-s	(Optional) Expands the image space. The default image space is 40 GB. The /var/tmp folder is used by default for space expansion.
   	-o	(Optional) Specifies the image output path. If you do not set this parameter, the current script path is used by default.
   	-f	(Optional) Forcibly runs the script again and deletes the downloaded files.
   	-k	(Optional) Compiles and installs the KAE driver.
   Measurement mode	-i	Measures a specified image. After the measurement is complete, the cVM image measurement baseline value file image_reference_measurement.json is generated in the current directory of the script.

   • If an error message is displayed indicating that the space is insufficient in image creation mode, run the following command to replace the current folder with a folder with sufficient space:

     export TMPDIR=/home/xxx

     

   • The script cannot specify both the image creation mode and the measurement mode at the same time. Only one mode can be selected per execution.