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- Price Reduction in Selected Availability Zones
- OrcaTerm Proxy IP Addresses Updates
- Pay-as-you-go Price Adjustments for Standard S3 CVMs in the Silicon Valley Region
- Vulnerability repairing for Linux images
- Stopping supporting for Ubuntu 10.04 images
- Solution to Tomcat Start Failure on Ubuntu14.04
- Upgrading Virtio network card drive for Windows CVMs
- About Configuration of Security Group Port 53
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- Using Tencent Cloud Automation Tools to execute commands
- Terminating/Returning Instances
- Enabling Instance Termination Protection
- Instance Repossession or Recovering
- Spot Instances
- Querying the Repossession Status of a Spot Instance
- No Charges When Shut Down for Pay-as-You-Go Instances
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- Migrating Servers
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- Best Practice
- Best Practices
- Choosing the CVM Model
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- Building a Visual GUI
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- Uploading Local Files to CVM
- Copying Local Files to CVMs
- Uploading Files from Windows to a Windows CVM via MSTSC
- Uploading Files from MacOS to Windows CVM Using MRD
- Uploading Files from Linux to Windows CVM using RDP
- Uploading files via WinSCP to a Linux CVM from Windows
- Uploading Files from Linux or MacOS to Linux CVM via SCP
- Uploading Files from Linux to a CVM Using FTP
- Uploading Files from Windows to a CVM Using FTP
- Other CVM Operations
- CVM Access to COS via a Private Network
- Best Practices for Boot Mode Legacy BIOS and UEFI
- Recovering Data on Linux CVMs
- Managing Disk Space on Windows CVMs
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- Network Performance Test
- High-throughput Network Performance Test
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- Using AVX-512 Instructions to Accelerate AI Applications on CVM
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- System Updates
- System Shutdown
- Configuring High-performance Power Management
- Windows Recovery Mode
- Updating the Virtio ENI Driver
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- Modifying VNC Resolution
- Ensuring Unique SIDs for CVMs Using Sysprep
- Use of the atop Monitoring Tools by Linux Instances
- Introduction to Linux Kernel Parameters
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- Failing to log in to a Linux CVM due to high CPU and memory usage
- Remote Login Failure due to Port Issues
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- sshd Configuration File Permissions
- Infinite Loop Call in /etc/profile
- Login Failure Due to Server Isolation
- Login Failure Due to High Bandwidth Occupation
- Remote Connect Failure Due to Security Group Settings
- Troubleshooting Linux Instance Issues via VNC and Rescue Mode
- Failed to shut down or restart a CVM
- Network Namespace Creation Failure
- Kernel and IO Issues
- Missing System bin or lib Soft Link
- Suspected Infection with Virus
- "no space left on device" Error During File Creation
- Linux CVM Memory Issues
- Network Related Failures
- Instance-Related Failures
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Region APIs
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- DescribeInstances
- DescribeInstanceFamilyConfigs
- DescribeZoneInstanceConfigInfos
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- DescribeInstanceVncUrl
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- DescribeInstancesStatus
- PurchaseReservedInstancesOffering
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- Data Types
- Error Codes
- FAQs
- Related Agreement
- Glossary
- Tutorial
- Release Notes and Announcements
- Release Notes
- Public Image Release Notes
- Announcements
- Updating Some Image Pip Package Management Tools for CentOS 7
- CentOS 8 End of Maintenance
- Discontinuation of Support for SUSE Commercial Images
- Price Reduction in Selected Availability Zones
- OrcaTerm Proxy IP Addresses Updates
- Pay-as-you-go Price Adjustments for Standard S3 CVMs in the Silicon Valley Region
- Vulnerability repairing for Linux images
- Stopping supporting for Ubuntu 10.04 images
- Solution to Tomcat Start Failure on Ubuntu14.04
- Upgrading Virtio network card drive for Windows CVMs
- About Configuration of Security Group Port 53
- Windows Server 2003 System Images End of Support Announcement
- End of Support for Windows Server 2008 R2 Enterprise Edition SP1 64-bit System Images
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Guide Overview
- Use Limits
- Convenience Features
- Instances
- Creating Instances
- Managing Instance Launch Template
- Batch Sequential Naming or Pattern String-Based Naming
- Logging In to Linux Instances
- Logging in to Windows instance
- Adjusting Configuration
- View Instance Details
- Renaming Instances
- Resetting Instance Password
- Managing Instance IPs
- Changing Instance Subnet
- Changing Security Group
- Conversion from Pay-As-You-Go to Monthly Subscription
- Searching for Instances
- Exporting Instance List
- Renewing Instances
- Starting Up Instances
- Shutting Down Instances
- Restarting Instances
- Reinstalling System
- Using Tencent Cloud Automation Tools to execute commands
- Terminating/Returning Instances
- Enabling Instance Termination Protection
- Instance Repossession or Recovering
- Spot Instances
- Querying the Repossession Status of a Spot Instance
- No Charges When Shut Down for Pay-as-You-Go Instances
- Managing Roles
- Enabling and Disabling Hyper-Threading
- Reserved Instances
- Images
- Migrating Servers
- Maintenance Tasks
- Cloud Disks
- Networking
- Security
- Security Groups
- Protection of Sensitive Operations
- Managing Login Password
- Managing SSH Keys
- Spread Placement Group
- Unblocking Port 25
- Tags
- Monitoring and Alarms
- Sample Console Configuration
- Best Practice
- Best Practices
- Choosing the CVM Model
- Setting up a Website
- Building an Environment
- Building a Website
- Building an Application
- Building a Visual GUI
- Data Backup
- Uploading Local Files to CVM
- Copying Local Files to CVMs
- Uploading Files from Windows to a Windows CVM via MSTSC
- Uploading Files from MacOS to Windows CVM Using MRD
- Uploading Files from Linux to Windows CVM using RDP
- Uploading files via WinSCP to a Linux CVM from Windows
- Uploading Files from Linux or MacOS to Linux CVM via SCP
- Uploading Files from Linux to a CVM Using FTP
- Uploading Files from Windows to a CVM Using FTP
- Other CVM Operations
- CVM Access to COS via a Private Network
- Best Practices for Boot Mode Legacy BIOS and UEFI
- Recovering Data on Linux CVMs
- Managing Disk Space on Windows CVMs
- Changing Kernel of a Linux Instance Manually
- Setting Up Windows-based AD Domain on a CVM
- Network Performance Test
- High-throughput Network Performance Test
- Using USB/IP to Share USB Devices in Linux
- Using RemoteFx to Redirect USB Devices in Windows
- Using AVX-512 Instructions to Accelerate AI Applications on CVM
- Building Tencent SGX Confidential Computing Environment
- Configuring Persistent Memory in M6p Instances
- Calling Cloud APIs via Python to Share Custom Images in Batches
- Operations Guide
- Initializing Data Disks
- Environment Configurations
- Installing Software
- User Data
- Work with Operating Systems
- System Activation
- System Updates
- System Shutdown
- Configuring High-performance Power Management
- Windows Recovery Mode
- Updating the Virtio ENI Driver
- Modifying SID
- Modifying VNC Resolution
- Ensuring Unique SIDs for CVMs Using Sysprep
- Use of the atop Monitoring Tools by Linux Instances
- Introduction to Linux Kernel Parameters
- Others
- Troubleshooting
- Instance-Related Failures
- CVM Login Failures
- Windows Instance Login Failures
- Windows Instance Login Failures
- An authentication error occurred when you tried to log in to a Windows instance remotely
- Failed to Reset the CVM Password or the CVM Password Is Invalid
- Connection to a Windows CVM through Remote Desktop was denied
- Requires network-level identity verification
- Problems occurred when you tried to log in to a Windows CVM remotely on Mac
- Failed to log in to a Windows CVM due to high CPU and memory usage
- Failed to connect to a remote computer through Remote Desktop
- Credentials Not Work
- Windows instance: no remote Desktop license server can provide license
- Remote Login Failure Due To Port Issues
- Linux Instance Login Failures
- Linux Instance Login Failures
- Unable to Log in to a Linux Instance via SSH Key
- Failing to log in to a Linux CVM due to high CPU and memory usage
- Remote Login Failure due to Port Issues
- VNC Login Error (Module is Unknown)
- VNC Login Error (Account Locked due to XXX Failed Logins)
- VNC Login Error (Login Failed with Correct Password)
- VNC or SSH Login Error (Permission Denied)
- Login Failure Due to /etc/fstab Configuration Errors
- sshd Configuration File Permissions
- Infinite Loop Call in /etc/profile
- Login Failure Due to Server Isolation
- Login Failure Due to High Bandwidth Occupation
- Remote Connect Failure Due to Security Group Settings
- Troubleshooting Linux Instance Issues via VNC and Rescue Mode
- Failed to shut down or restart a CVM
- Network Namespace Creation Failure
- Kernel and IO Issues
- Missing System bin or lib Soft Link
- Suspected Infection with Virus
- "no space left on device" Error During File Creation
- Linux CVM Memory Issues
- Network Related Failures
- Instance-Related Failures
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Region APIs
- Instance APIs
- DescribeInstances
- DescribeInstanceFamilyConfigs
- DescribeZoneInstanceConfigInfos
- DescribeInstanceTypeConfigs
- DescribeInstancesOperationLimit
- DescribeInstanceVncUrl
- InquiryPriceRunInstances
- InquiryPriceResetInstance
- InquiryPriceResetInstancesType
- InquiryPriceResizeInstanceDisks
- RunInstances
- StartInstances
- RebootInstances
- StopInstances
- ResetInstance
- TerminateInstances
- ResetInstancesType
- ResizeInstanceDisks
- ResetInstancesPassword
- ModifyInstancesAttribute
- ModifyInstancesProject
- InquirePricePurchaseReservedInstancesOffering
- DescribeReservedInstancesConfigInfos
- DescribeInstancesStatus
- PurchaseReservedInstancesOffering
- Cloud Hosting Cluster APIs
- Placement Group APIs
- Image APIs
- Key APIs
- Security Group APIs
- Network APIs
- Instance Launch Template APIs
- Data Types
- Error Codes
- FAQs
- Related Agreement
- Glossary
Setting the GRUB File Disk Identification Method to UUID
Last updated: 2024-01-08 09:37:00
Operation Scenario
To ensure the Linux system can correctly identify the disk when launching the file system, please inspect and correctly set the GRUB file disk identification method.
The GRand Unified Bootloader (GRUB) serves as a bootloader for initiating the operating system. GRUB permits the utilization of device names (for instance,
/dev/vda1, /dev/vdb1 and so forth) to identify disk partitions. However, these device names may change due to the change in the actual operating environment after an image is imported. To guarantee the correct booting of the system even when the device name changes, you can modify the disk identification method in the GRUB file to the Universally Unique Identifier (UUID). Setting the GRUB File Disk Identification Method to UUID
Confirming the GRUB File Path
There are two common versions of GRUB: GRUB (GRUB Legacy) and GRUB2. The configuration files for GRUB and GRUB2 are located in different paths.
For GRUB, the configuration file is typically located in
/boot/grub/menu.lst or /boot/grub/grub.conf.For GRUB2, the configuration file is commonly located in
/boot/grub/grub.cfg or /boot/grub2/grub.cfg.If you find the
menu.lst or grub.conf file in the /boot/grub directory, you are probably using GRUB (GRUB Legacy). If you find the grub.cfg file in the /boot/grub or /boot/grub2 directory, you are probably using GRUB2.Obtaining the UUID
To obtain the UUID of a partition, the
blkid command can be used. Running the blkid command will display the detailed information of all the available partitions, including the UUIDs. Run the following command in the terminal: sudo blkid
The output similar to the following one indicates that the associated UUID of the device
/dev/vda1 is c0b9ecd8-f922-4e5d-bccb-83fbc94ad23b. /dev/vda1: UUID="c0b9ecd8-f922-4e5d-bccb-83fbc94ad23b" BLOCK_SIZE="4096" TYPE="ext4" PARTUUID="bcfcb5cb-01"
Modifying the GRUB configuration file
This segment highlights an example where the modification of the GRUB2 configuration file located in the
/boot/grub/grub.cfg directory is made. If you are using GRUB, or if the GRUB2 configuration file for distribution is located in the /boot/grub2/grub.cfg directory, you can adjust the configuration according to the actual situation. 1. Back up the current
/boot/grub/grub.cfg file to the /home directory.sudo cp /boot/grub/grub.cfg /home
2. Use the vi editor to open the
/boot/grub/grub.cfg file and confirm the root partition marked in the configuration file. In this case, the root partition is located on the /dev/vda1 device. sudo vi /boot/grub/grub.cfg
# /boot/grub/grub.cfg...echo 'Loading Linux 6.1.0-13-amd64 ...'linux /boot/vmlinuz-6.1.0-13-amd64 root=/dev/vda1 roecho 'Loading initial ramdisk ...'...
3. Edit the configuration starting with a device name in the
grub.cfg file, and change the root=/dev/vda1 device name to the root=UUID=xxx format. The content after root=UUID= is the UUID value corresponding to the device returned by running the blkid command. This configuration may appear for multiple times in the grub.cfg file. The modifcation is required for each configuration. # Before modification...echo 'Loading Linux 6.1.0-13-amd64 ...'linux /boot/vmlinuz-6.1.0-13-amd64 root=/dev/vda1 roecho 'Loading initial ramdisk ...'...# After modification...echo 'Loading Linux 6.1.0-13-amd64 ...'linux /boot/vmlinuz-6.1.0-13-amd64 root=UUID=c0b9ecd8-f922-4e5d-bccb-83fbc94ad23b roecho 'Loading initial ramdisk ...'...
4. Press Esc to enter :wq. Press Enter to save the configuration and exit the editor.
5. (Optional) Run the following command to ensure the modification has been successfully saved.
sudo cat /boot/grub/grub.cfg
...linux /boot/vmlinuz-6.1.0-13-amd64 root=UUID=c0b9ecd8-f922-4e5d-bccb-83fbc94ad23b ro...
6. (Optional) Delete the
grub.cfg backup file in the /home directory.
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