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Elastic Cloud Server
Elastic Cloud Server
- What's New
- Function Overview
- Service Overview
-
Billing
- Billing Overview
- Billing Modes
- Billing Items
- Billing Examples
- Billing Mode Changes
- Subscription Renewal
- Bills
- Arrears
- Billing Termination
- Cost Management
-
Billing FAQ
-
Billing Modes
- What Are the Differences Between Yearly/Monthly and Pay-per-Use Billing Modes?
- Will I Be Billed After ECSs Are Stopped?
- Can I Switch Between Yearly/Monthly and Pay-per-Use Billing Modes?
- FAQs About ECS Frozen, Deletion, and Unsubscription
- How Can I Stop an ECS from Being Billed?
- FAQs About Spot ECSs
- Renewal and Unsubscription
-
Billing Modes
- Getting Started
-
User Guide
- Using IAM to Grant Access to ECS
- Instances
- Images
- Disks
- Elastic Network Interfaces
- EIPs
- Security
- Backup Using CBR
- Passwords and Key Pairs
- Resources and Tags
-
Monitoring Using Cloud Eye
- Monitoring ECSs
- Basic ECS Metrics
- OS Monitoring Metrics Supported by ECSs with the Agent Installed
- Process Monitoring Metrics Supported by ECSs with the Agent Installed
- OS Monitoring Metrics Supported by ECSs with the Agent Installed and Using Simplified Monitoring Metrics
- Setting Alarm Rules
- Viewing ECS Metrics
- Audit Using CTS
-
Best Practices
- Best Practices Summary
- Setting Up Websites on ECSs
- Configuring an ECS
- Setting Up an Environment
- Setting Up a Website
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Setting Up an Application
- Setting Up an FTP Site
- Building Microsoft SharePoint Server 2016
- Deploying Docker
- Deploying an ECS for Handling Text Messages from an Official WeChat Account
- Manually Deploying GitLab (CentOS 7.2)
- Manually Deploying RabbitMQ (CentOS 7.4)
- Setting Up Master-Slave Replication on PostgreSQL
- Manually Installing a BT Panel (CentOS 7.2)
- Installing and Deploying Jenkins on an ECS
- Using auditd to Record File Changes (Linux)
- Restoring Accidentally Deleted Data Using Extundelete (Linux)
- Setting Up a ThinkPHP Framework
- Securing an ECS
- Migrating an ECS
- Accessing OBS from an ECS over the Intranet
- Using VNC Viewer to Access a Linux ECS
-
API Reference
- Before You Start
- API Overview
- Calling APIs
-
APIs (Recommended)
- Lifecycle Management
-
Status Management
- Reinstalling an ECS OS (Using an Image with Cloud-Init Installed)
- Changing an ECS OS (Using an Image with Cloud-Init Installed)
- Reinstalling an ECS OS (Using an Image Without Cloud-Init Installed)
- Changing an ECS OS (Using an Image Without Cloud-Init Installed)
- Cold Migrating an ECS
- Obtaining the VNC Login Address
- Modifying the Specifications of an ECS
- Modifying the Specifications of an ECS (Pay-per-Use)
- Batch Operations
- Flavor Management
- NIC Management
- Disk Management
- Metadata Management
- Tenant Quota Management
- Task Status Management
- Tag Management
- ECS Group Management
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OpenStack Nova APIs
- API Version Query
- Lifecycle Management
- Status Management
- Network Management
- Security Group Management
- Flavor Management
- NIC Management
- Disk Management
- Metadata Management
- Tenant Quota Management
- Key and Password Management
- ECS Group Management
- ECS Operation Management
- ECS Console Management
- AZ
- Tag Management
- Historical Versions
- Application Examples
- Data Structure
-
Permissions and Supported Actions
- Introduction
- Lifecycle Management
- ECS Status Management
- Batch Operations
- Network Management
- Image Management
- Security Group Management
- Specifications Query
- NIC Management
- Disk Management
- Metadata Management
- Tenant Quota Management
- SSH Key Management
- Floating IP Address Management
- ECS Group Management
- ECS Management Through Console
- AZ Management
- Tag Management
- Common Parameters
-
Out-of-Date APIs
- Status Management
- Flavor Management
- NIC Management
- Disk Management
- Tag Management
- Image Management (OpenStack Nova APIs)
- Security Group Management (OpenStack Nova APIs)
- Disk Management (OpenStack Nova APIs)
-
Floating IP Address Management (OpenStack Nova APIs)
- Binding a Floating IP Address (Discarded)
- Unbinding a Floating IP Address (Discarded)
- Assigning a Floating IP Address (Discarded)
- Querying Floating IP Addresses (Discarded)
- Querying Details About a Floating IP Address (Discarded)
- Releasing a Floating IP Address (Discarded)
- Querying Floating IP Address Pools (Discarded)
- Snapshot Management (OpenStack Nova APIs)
- Appendix
- Change History
- SDK Reference
-
FAQs
- Common FAQ
- Product Consulting FAQ
-
ECS Creation FAQ
- What Should I Do If the ECS Resources to Be Purchased Are Sold Out?
- How Can I Set Sequential ECS Names When Creating Multiple ECSs?
- What Is the Creation Time and Startup Time of an ECS?
- Why Does the Failures Area Show an ECS Creation Failure But the ECS List Displays the Created ECS?
- Why Cannot I View the ECSs Being Created Immediately After I Pay for Them?
- Why Does It Take Longer to Create ECSs When I Use a Full-ECS Image?
- What Do I Do If I Selected an Incorrect Image for My ECS?
- How Quickly Can I Obtain an ECS?
- How Can I Manage ECSs by Group?
- ECS Deletion and Unsubscription FAQ
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Remote Login FAQ
- Login Preparations
-
Remote Logins
- Why Can't I Log In to My Linux ECS?
- How Can I Change a Remote Login Port?
- Why Cannot I Use a Non-Default SSH Port to Log In to My Linux ECS?
- What Browser Version Is Required to Remotely Log In to an ECS?
- How Can I Log In to an ECS After It Exchanged the System Disk with Another ECS Running the Same OS?
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VNC Login
- Why Are Garbled Characters Displayed When I Log In to My ECS Using VNC?
- What Should I Do If I Cannot View Data After Logging In to an ECS Using VNC?
- Why Does a Blank Screen Appear After I Attempted to Log In to an ECS Using VNC?
- What Should I Do If Error Code 1006 or 1000 Is Displayed When I Log In to an ECS Through the Management Console?
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Remote Login Errors on Linux
- Why Am I Seeing the Error Message "Module is unknown" When I Remotely Log In to a Linux ECS?
- What Should I Do If Error Message "Permission denied" Is Displayed When I Remotely Log In to a Linux ECS?
- What Should I Do If Error Message "read: Connection reset by peer" Is Displayed When I Remotely Log In to a Linux ECS?
- Why Am I Seeing the Error Message "Access denied" When I Remotely Log In to a Linux ECS?
- What Should I Do If Error Message "Disconnected: No supported authentication methods available" Is Displayed When I Remotely Log In to a Linux ECS?
-
Billing FAQ
- What Are the Differences Between Yearly/Monthly and Pay-per-Use Billing Modes?
- Will I Be Billed After ECSs Are Stopped?
- Can I Switch Between Yearly/Monthly and Pay-per-Use Billing Modes?
- FAQs About ECS Frozen, Deletion, and Unsubscription
- How Can I Stop an ECS from Being Billed?
- FAQs About Spot ECSs
- How Can I Renew ECSs?
- How Can I Automatically Renew a Yearly/Monthly ECS?
- Will I Receive a Notification If My Account Balance Is Insufficient?
-
Region and AZ FAQ
- What Is AZ and How Can I Select and View an AZ?
- What Is a Region?
- Are Products Different in Different Regions?
- Is Data Transmission Between AZs Billed?
- Can I Change the Region or AZ After an ECS Is Purchased?
- Can I Migrate an ECS to Another Region, AZ, or Account?
- Can a Load Balancer Distribute Traffic to ECSs in Different Regions?
- Can Components Contained in an Application Be Distributed to Different Regions?
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OS FAQ
- Do ECSs Support GUI?
- How Can I Install a GUI on an ECS Running CentOS 6?
- How Can I Install a GUI on an ECS Running CentOS 7?
- How Can I Install a GUI on an ECS Running Ubuntu?
- Why Does the OS Fail to Respond When kdump Occurs on a Linux ECS?
- How Can I Upgrade the Kernel of a Linux ECS?
- Why Cannot My ECS OS Start Properly?
- How Can I Fix the Meltdown and Spectre Security Vulnerabilities on Intel Processor Chips?
- How Can I Enable SELinux on an ECS Running CentOS?
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Disk Partition, Attachment, and Expansion FAQ
- How Can I Adjust System Disk Partitions?
- How Can I Obtain the Mapping Between Disk Partitions and Disk Devices on a Linux ECS?
- How Can I Add the Empty Partition of an Expanded System Disk to the End Root Partition Online?
- How Can I Add the Empty Partition of an Expanded System Disk to the Non-end Root Partition Online?
- Can I Attach Multiple Disks to an ECS?
- What Are the Requirements for Attaching an EVS Disk to an ECS?
- Which ECSs Can Be Attached with SCSI EVS Disks?
- How Do I Obtain My Disk Device Name in the ECS OS Using the Device Identifier Provided on the Console?
- Why Does a Linux ECS with a SCSI Disk Attached Fails to Be Restarted?
- How Can I Check Whether the ECSs Attached with the Same Shared SCSI Disk Are in the Same ECS Group?
- Can All Users Use the Encryption Feature?
- How Can I Add an ECS with Local Disks Attached to an ECS Group?
- Will My EVS Disk Be Deleted When I Delete Its Server?
- Why Does the Disk Drive Letter Change After the ECS Is Restarted?
- How Can I Obtain Data Disk Information If Tools Are Uninstalled?
- How Can I Rectify the Fault That May Occur on a Linux ECS with an NVMe SSD Disk Attached?
- Why Are Disk Error Logs Printed After a Disk Attached to an ECS Is Formatted with the ext4 File System?
- Data Backup and Restoration FAQ
-
Network Configuration FAQ
- How Can I Configure the NTP and DNS Servers for an ECS?
- Does HUAWEI CLOUD Provide the NTP Server and How Can I Configure It?
- How Do I Configure DNS for an ECS?
- Can the ECSs of Different Accounts Communicate over an Intranet?
- Will ECSs That I Purchased Deployed in the Same Subnet?
- How Do I Change the CIDR Block of an ECS Subnet?
- How Do I Configure Port Mapping?
- How Can I Obtain the MAC Address of My ECS?
- How Can I View and Modify Kernel Parameters of a Linux ECS?
- Why Is the NIC Not Working?
- Why Can't I Use DHCP to Obtain a Private IP Address?
- How Can I Test the Network Performance of Linux ECSs?
- What Should I Do If NIC Flapping Occurs After My ECS Specifications Are Modified?
- Will NICs Added to an ECS Start Automatically?
- How Can I Check Whether the Network Communication Is Normal Between Two ECSs Equipped with an InfiniBand NIC Driver?
- How Can I Manually Configure an IP Address for an InfiniBand NIC?
- How Can I Add a Static Route to a CentOS 6.5 OS?
- EIP FAQ
-
Password and Key Pair FAQ
- How Can I Change the Password for Logging In to a Linux ECS?
- What Is the Default Password for Logging In to a Linux ECS?
- How Can I Set the Validity Period of the Image Password?
- Resetting the Password for Logging In to an ECS in the OS
- What Should I Do If the System Displays a Message Indicating that the Password Is Incorrect When I Remotely Log In to My ECS?
- What Should I Do If I Cannot Log In to My ECS Using the Initial Password After I Use It for a Period of Time?
- Disabling SELinux
- How Can I Obtain the Key Pair Used by My ECS?
- How Can I Use a Key Pair?
- Can I Download a Key Pair from My Phone?
- What Should I Do If a Key Pair Cannot Be Imported?
- Why Does the Login to My Linux ECS Using a Key File Fail?
- What Should I Do If I Cannot Download a Key Pair?
- Why Does a Key Pair Created Using puttygen.exe Fail to Be Imported on the Management Console?
- What Should I Do If Cloud-Init Does Not Work After Python Is Upgraded?
- Application Deployment and Software Installation FAQ
-
File Upload/Data Transfer FAQ
- How Do I Upload Files to My ECS?
- How Can I Use WinSCP to Transfer Files from a Local Windows Computer to a Linux ECS?
- How Can I Use SCP to Transfer Files Between a Local Linux Computer and a Linux ECS?
- How Can I Use SFTP to Transfer Files Between a Local Linux Computer and a Linux ECS?
- How Can I Use FTP to Transfer Files from a Local Windows Computer to a Linux ECS?
- How Can I Use FTP to Transfer Files Between a Local Linux Computer and a Linux ECS?
- What Should I Do If the Connection Between the Client and the Server Times Out When I Upload a File Using FTP?
- What Should I Do If Writing Data Failed When I Upload a File Using FTP?
- Why Am I Seeing an FTP Folder Error When I Open a Folder on an FTP Server?
- Why Do I Fail to Connect to a Linux ECS Using WinSCP?
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ECS Failure FAQ
- How Do I Handle Error Messages Displayed on the Management Console?
- What Should I Do If Emails Configured on an ECS Cannot Be Sent?
- Why Is the Memory of an ECS Obtained by Running the free Command Inconsistent with the Actual Memory?
- Why Is the Hostname of My ECS Restored to the Original Name After the ECS Is Restarted?
- Is an ECS Hostname with Suffix .novalocal Normal?
- Why Does a Forcibly-Stopped Linux ECS Fail to Be Restarted?
- How Can a Changed Static Hostname Take Effect Permanently?
- Why Can't My Linux ECS Obtain Metadata?
- Slow ECS Response FAQ
- Specification Modification FAQ
-
OS Change FAQ
- Does OS Change Incur Fees?
- Can I Install or Upgrade the OS of an ECS?
- Can I Change the OS of an ECS?
- How Long Does It Take to Change an ECS OS?
- Will I Lose My Disk Data If I Reinstall ECS OS, Change the OS, or Change the ECS Specifications?
- Does OS Reinstallation Incur Fees?
- Can I Select Another OS During ECS OS Reinstallation?
- How Long Does It Take to Reinstall an ECS OS?
- ECS Security Check FAQ
- Resource Management and Tag FAQ
-
Image Source Management FAQ
- How Can I Use an Automated Tool to Configure a Huawei Cloud Image Source (x86_64 and Kunpeng)?
- How Can I Use an EPEL Image Source (x86_64 or Kunpeng) Provided by Huawei Cloud?
- How Can I Use a Pypi Image Source (x86_64 or Kunpeng) Provided by Huawei Cloud?
- What Can I Do If the Download Speed Is Slow After the yum makecache Command Is Executed?
- Internet Inaccessible FAQ
- Website or Application Inaccessible FAQ
- Slow Website or Application Response FAQ
-
Troubleshooting
-
General Issues
- Why Accessing a Website Outside the Chinese Mainland Is Slow on an ECS?
- How Do I Troubleshoot a Ping Failure or Packet Loss Using a Link Test?
- How Do I Troubleshoot Slow Connections to a Website Hosted on My ECS?
- How Do I Troubleshoot an Unresponsive Website Hosted on My ECS?
- Why Am I Unable to Connect to a Port on an ECS?
- How Can I Resolve High Bandwidth Usage on My ECSs?
- Why Is My Windows ECS Running Slowly?
- Why Is My Linux ECS Running Slowly?
- How Can I Handle Slow ECS Startup?
- How Do I Configure Multiple IP Addresses for an ECS with Multiple NICs Attached?
-
Windows ECS Issues
- How Can I Retain a Session on a Windows ECS?
- How Can I Fix the Difference Between the System Time and the Local Standard Time?
- How Do I Attach an Extension NIC to a Windows ECS for Accessing the Internet?
- How Can I Fix Grayed Out Copy and Paste Options?
- How Do I Configure File Sharing and Network Disk Mapping for a Windows ECS?
- How Do I Troubleshoot an In-Service Port During Tomcat Startup?
- How Do I Troubleshoot Unavailable Input Methods?
- How Do I Share Files Between Windows ECSs?
- How Do I Restore Data in the Event of a Startup Failure on a Windows ECS?
- How Do I View Login Logs of a Windows ECS?
-
Linux ECS Issues
- Why Is My Linux ECS Not Booting and Going Into Emergency Mode?
- How Do I Fix a "Read-Only" Error When I Edit the /etc/fstab File?
- How Do I Change the Time Zone on ECSs Running CentOS or EulerOS?
- How Do I Troubleshoot "nf_conntrack:table full, dropping packet"?
- How Do I Change the Default Boot Kernel in Ubuntu?
- How Do I Configure atop and kdump on Linux ECSs for Performance Analysis?
- Why Is the OS Version of My ECS Not the One in the Image I Selected During ECS Creation?
- How Do I Enable My ECS to Boot From the Second Kernel If It Fails to Boot from the First Kernel?
- How Can I Make /etc/rc.local Run at Startup in CentOS 7?
- What OSs Are Supported If I Want to Install Docker on a Linux ECS?
- Why Do the Modifications to /etc/security/limits.conf Not Take Effect After the ECS Restarts?
- How Do I Set vCPU Affinity for Processes Using taskset?
- What Should I Do If Error "command ´gcc´ failed with exit status 1" Occurs During PIP-based Software Installation
- What Can I Do If Switching from a Non-root User to User root Times Out?
- What Can I Do If the Permissions on the Root Directory of My CentOS ECS Changed to 777?
- What Should I Do If the IP Settings of My Linux ECS Are Lost?
- Why Does My Linux ECS Restart Unexpectedly?
- What Do I Do If Error "Cannot allocate memory" Is Displayed?
-
Configuring the Network
- Why Does My ECS Running CentOS 7 Fail to Obtain an IP Address Using dhclient?
- Why Does the NIC Names Change After I Start a Linux ECS?
- Why an Entry Is Automatically Added to /etc/hosts After a Linux ECS Is Restarted?
- How Do I Fix a Network Startup Failure Due to Multiple NIC Configuration Files?
- Why Do I Get the Error "Name or service not known" When I Ping a Public Domain Name Configured for a Linux ECS?
- Why Cannot the EIP Bound to the Extension NIC of My ECS Access the Internet?
- How Do I Fix Too High Memory Usage by NetworkManager When Multiple Docker Containers Are Running?
- Why Is the ECS IP Address Lost After the System Time Changes?
- What Can I Do If resolv.conf Gets Reset?
-
Disk Space Management Issues
- Why Can't I Mount a Disk on an Old Mount Point by Modifying fstab in CentOS 7?
- How Do I Create a Swap Partition or File in Linux?
- Why Is the Space Not Released After I Delete a Large File on a Linux ECS?
- What Should I Do If the "Read-only file system" Error Message Is Displayed When I Attempt to Delete a File on a Linux ECS?
- How Do I Fix File Creation Failures Due to Inode Exhaustion?
- Why Do I Get the Error "No space left on device" When I Create a File on a Linux ECS?
- Why the Buffer and Cache Occupy Too Much Memory of a Linux ECS?
- GPU Driver Issues
-
SSH Connection Issues
- How Do I Keep an SSH Session Alive?
- How Can I Allow or Deny Login from Specific Users or IP Addresses to an ECS Using SSH?
- Why Can't I Access an ECS Running CentOS 7 Using SSH After I Changed the Default SSH Port?
- How Can I Resolve ECS Login Failures Due to Corrupt /etc/passwd?
- Why Does It Takes a Long Time to Connect to an ECS Using SSH After UseDNS Is Enabled?
- Why Does sshd Fail to Be Started on a Linux ECS?
- How Do I Disable Login to an ECS Using SSH Password?
- Why Are Connections to a Linux ECS Using SSH or to Applications on the ECS Interrupted Occasionally?
-
Multi-User Login Issues
- How Do I Configure Multi-User Logins for an ECS Running Windows Server 2012?
- Why Does a Browser Launch Error Occur in Multi-User Login?
- How Do I Apply for a License for Authenticating Multi-User Sessions and Activate an ECS?
- How Do I Troubleshoot Login Screen Flickering After Configuring Multi-User Login?
-
Passwords and Key Pairs Issues
- How Do I Reset the Password for User root in Single-User Mode on a Linux ECS?
- How Do I Reset the Password for Logging In to a Linux ECS?
- How Do I Fix the "Authentication token manipulation error" When I Reset the Password Using passwd on a Linux ECS?
- How Do I Change the Key Pair for a Linux ECS?
- How Do I Change the Login Mode of a Linux ECS from Key Pair to Password?
- Firewall Configuration Issues
- BSOD Issues
- IIS Installation Issues
- Change History
-
General Issues
- Videos
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Help Center/
Elastic Cloud Server/
FAQs/
OS Change FAQ/
Can I Select Another OS During ECS OS Reinstallation?
Can I Select Another OS During ECS OS Reinstallation?
Updated on 2024-09-26 GMT+08:00
No. You can use only the original image of the ECS to reinstall the OS. To use a new system image, see Changing the OS.
Parent topic: OS Change FAQ
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