What Do I Do If the Disks of an ECS Created from a CentOS Image Cannot Be Found?
Symptom
Generally, this is because the xen-blkfront.ko module is not loaded during the startup. You need to modify OS kernel startup parameters. Figure 1 shows the startup screen after the login to the ECS.
Solution
Perform the following operations to modify OS kernel boot parameters:
These operations must be performed after the OS starts. You are advised to modify kernel boot parameters in the ECS used for creating the image.
- Run the following command to log in to the OS:
lsinitrd /boot/initramfs-`uname -r`.img |grep -i xen
- If the command output contains xen-blkfront.ko, contact the customer service.
- If no command output is displayed, go to 2.
- Back up the GRUB configuration file.
- Use the vi editor to open the GRUB configuration file. Run the following command (using CentOS 7 as an example):
vi /boot/grub2/grub.cfg
- Add xen_emul_unplug=all to the default boot kernel.
Search for the line that contains root=UUID= and add xen_emul_unplug=all to the end of the line.
menuentry 'CentOS Linux (3.10.0-229.el7.x86_64) 7 (Core) with debugging' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-229.el7.x86_64-advanced-bf3cc825-7638-48d8-8222-cd2f412dd0de' { load_video set gfxpayload=keep insmod gzio insmod part_msdos insmod ext2 set root='hd0,msdos1' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint='hd0,msdos1' bf3cc825-7638-48d8-8222-cd2f412dd0de else search --no-floppy --fs-uuid --set=root bf3cc825-7638-48d8-8222-cd2f412dd0de fi linux16 /boot/vmlinuz-3.10.0-229.el7.x86_64 root=UUID=bf3cc825-7638-48d8-8222-cd2f412dd0de xen_emul_unplug=all ro crashkernel=auto rhgb quiet systemd.log_level=debug systemd.log_target=kmsg initrd16 /boot/initramfs-3.10.0-229.el7.x86_64.img }
- Press Esc, enter :wq, and press Enter to exit the vi editor.
- Create an image using the ECS, upload and register the image on the cloud platform.
ECS Creation FAQs
- Can I Change the Image of a Purchased ECS?
- Can I Use a Private Image to Create ECSs with Different Hardware Specifications from the ECS Used to Create the Private Image?
- Can I Specify the System Disk Size When I Create an ECS Using an Image?
- What Do I Do If No Partition Is Found During the Startup of an ECS Created from an Imported Private Image?
- What Do I Do If the Disks of an ECS Created from a CentOS Image Cannot Be Found?
- What Do I Do If an ECS Created from a Windows Image Failed to Start When I Have Enabled Automatic Configuration During Image Registration?
- What Do I Do If an Exception Occurs When I Start an ECS Created from an Image Using the UEFI Boot Mode?
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