Help Center/ Image Management Service/ User Guide/ Managing Private Images/ Optimizing a Linux Private Image/ Checking Whether a Private Image Needs to be Optimized
Updated on 2024-03-04 GMT+08:00
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Checking Whether a Private Image Needs to be Optimized

  • If the virtualization type is Xen, optimization is required.
  • If the virtualization type is KVM and VirtIO drivers are not installed, optimization is required.
  • If the virtualization type is KVM and VirtIO drivers are installed, optimization is not required.

Procedure

  1. Run the following command to check the virtualization type of an ECS:

    lscpu

    • If the value of Hypervisor vendor is Xen, optimize the private image as instructed in Process.
    • If the value of Hypervisor vendor is KVM, go to the next step for further check.
    Figure 1 Checking the virtualization type of a Linux ECS
  2. Check whether VirtIO drivers have been installed.
    • CentOS/EulerOS

      For initramfs, run the following command:

      lsinitrd /boot/initramfs-`uname -r`.img | grep virtio

      For initrd, run the following command:

      lsinitrd /boot/initrd-`uname -r` | grep virtio

    • Ubuntu/Debian

      lsinitramfs /boot/initrd.img-`uname -r` |grep virtio

    • SUSE/openSUSE
      • SUSE 12 SP1/openSUSE 13 or earlier:

        lsinitrd /boot/initrd-`uname -r` | grep virtio

      • SUSE 12 SP1 or later than SUSE 12 SP1/openSUSE 13:

        For initramfs, run the following command:

        lsinitrd /boot/initramfs-`uname -r`.img | grep virtio

        For initrd, run the following command:

        lsinitrd /boot/initrd-`uname -r` | grep virtio

    If virtio is displayed, VirtIO drivers have been installed. For more information, see Creating a Linux System Disk Image from an External Image File.

    Otherwise, VirtIO drivers have not been installed. Optimize the private image as instructed in Process.