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- Service Overview
- Getting Started
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User Guide
- Granting Permissions to Use FlexusL Instances Through IAM
- Purchasing a FlexusL Instance
- Remotely Logging In to a FlexusL Instance
- Managing FlexusL Instances
- Managing Images
- Managing EVS Disks
- Managing Server Security
- Managing Backups
- Managing Domain Names
- Monitoring
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Best Practices
- Best Practices for FlexusL
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Setting Up a Website
- Managing Servers Using the BT Panel
- Building a WordPress Website
- Using Matomo to Build a Website Traffic Statistics System
- Using Odoo to Build an ERP System
- Using Moodle to Build an Online Learning System
- Using Joomla to Build a Content Management System
- Using Ghost to Build a Personal Blog
- Using EspoCRM to Build a Content Management System
- Setting Up the Development Environment
- Setting Up an Application
- Server Migration
- API Reference
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FAQs
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Product Consulting
- What Are the Differences Among FlexusL, FlexusX, and ECS?
- How Do I Find My Purchased FlexusL Instances on the Management Console?
- Where Can I View the FlexusL Instance ID and Cloud Server ID Packaged in the FlexusL Instance?
- Can I Migrate Cloud Servers to FlexusL?
- What Should I Do If I Do Not Have Permissions to Purchase FlexusL?
- What Regions Does FlexusL Support?
- What Is the Relationship Among FlexusL Instances, the Dashboard, and the O&M Page?
- Billing
- Creation and Unsubscription
- Specification Changes
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OS and Image
- Do FlexusL OS Images Provide Visualized Dashboards?
- What Should I Do If a Private Image Cannot Be Used to Create a FlexusL Instance or Change the OS of a FlexusL Instance Because the Password Reset Plug-in Is Not Installed on the Image or the Image's onekey_resetpasswd Tag Is Missing?
- How Do I Check that an Application Image Has Been Up and Running?
- How Do I View the Applications That Are Installed in the FlexusL Application Images by Default?
- Why Can't I Open the Dashboard of the Application Pre-installed in the Application Image?
- How Do I Upgrade the BT Panel?
- Why Can't I Access the Dashboard of the Application Pre-installed in the Application Image After Entering the Initial Username and Password?
- What Do I Do If HSS Is Not Started After I Use a Private Image to Create a FlexusL Instance or Change the OS of an Instance?
- Remote Login
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Password
- What Are the Username and Password for Remotely Logging In to a FlexusL Instance Server?
- What Can I Do If I Forget the Login Password of a FlexusL Instance?
- What Should I Do If the Password Cannot Be Reset After I Use a Private Linux Image to Create a FlexusL Instance or Change the OS of an Existing FlexusL Instance and I Forgot the Initial Password of the Private Image?
- What Should I Do If the Password Cannot Be Reset After I Use a Private Linux Image to Create a FlexusL Instance or Change the OS of an Existing FlexusL Instance and I Know the Initial Password of the Private Image?
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Network
- Does a FlexusL Instance Have an EIP?
- Can I Change the Public and Private IP Addresses of a FlexusL Instance?
- How Do I Use Data Packages in FlexusL Instances?
- How Do I View the Traffic Usage of My FlexusL Instance?
- Can I Add a Data Package to a FlexusL Instance?
- What Do I Do If My FlexusL Instance Freezes?
- How Does FlexusL Instances Communicate with Each Other and with Other Cloud Resources Over a Private Network?
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EVS Disks
- How Do I Detach or Unsubscribe from a System or Data Disk of a FlexusL Instance?
- Can I Use EVS Disk Snapshots to Back Up FlexusL Instance Data?
- Can EVS Disks of FlexusL Instances Be Expanded?
- Can I Change the EVS Disk Type for a FlexusL Instance?
- Can I Attach Existing Data Disks to My FlexusL Instances?
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Product Consulting
- General Reference
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Changing an OS
Scenarios
If the OS running on the cloud server in a FlexusL instance cannot meet service requirements, you can change the OS to another OS version or type.
Notes
- An OS change does not make any changes to server specifications.
- After the OS is changed, the server IP address remains unchanged.
- Data in all partitions (including the system partition) of the system disk will be cleared, so you are advised to back up the system disk data prior to an OS change.
- An OS change does not affect data in data disks.
- After the OS is changed, the original OS is not retained.
- After you change the OS, you need to deploy services in the new OS.
- After the OS is changed, the server automatically starts.
- Do not reset the password of, restart, or stop the FlexusL instance immediately after the OS is changed. Wait for several minutes until the system successfully injects the password, or the login will fail.
Constraints
- Application images have the minimum CPU and memory specification requirements. If the specification of a FlexusL instance is low, you cannot change its OS using an application image that requires higher specifications. For example, you cannot change the OS of a FlexusL instance with 2 vCPUs and 4 GiB memory using the GitLab application image that needs to use at least 2 vCPUs and 8 GiB memory. To do so, upgrade the FlexusL instance by performing Modifying the Specifications of a FlexusL Instance first and try again.
- After the OS is changed, the login password is cleared. You need to reset the password by performing Resetting the Password for a FlexusL Instance for logging in to the new OS. If you switch to an application image, reset the password only after the image with the pre-installed application is up and running, or the password reset may fail.
- Before using a private image, you need to learn about the constraints on private images in Table 1 for FlexusL instances.
Preparations
If you want to use a private to change the OS of a FlexusL instance, create an image using Huawei Cloud IMS. A private image can be used by FlexusL instances only after it is created on the IMS console. For more information, see Creating a FlexusL Instance from a Private Image or Using a Private Image to Change the OS.
Billing
An OS change does not involve refund or supplementary payment.
Procedure
- Log in to the FlexusL console and click a resource card to go to the instance details page.
- Change the OS using any of the following methods.
- Method 1: Locate the target FlexusL instance, choose
> Change OS.
- Method 2: On the Overview page, choose
> Change OS in the upper right corner.
- Method 3: On the Cloud Servers page, choose
> Change OS in the row containing the target server.
- Method 4: On the Cloud Servers page, click the target server name. In the upper right corner of the displayed page, choose
> Change OS.
- Method 1: Locate the target FlexusL instance, choose
- Specify the parameters required for changing the OS.
- Select the image to be switched.
FlexusL provides OS images, a rich variety of application images, and private images for you to select. Before using a private image, learn about the constraints on private images and then create an image. For details, see Images Supported by FlexusL Instances.
- Select Stop server. The server must be stopped before its OS is changed.
- Select the image to be switched.
- Read and agree to the agreements, and click Submit.
After the OS is changed, the server automatically starts. When the server status is Running, the OS change is complete.
NOTICE:
- Do not reset the password of, restart, or stop the FlexusL instance immediately after the OS is changed. Wait for several minutes until the system successfully injects the password, or the login will fail.
- After the OS is changed, the login password is cleared. You need to reset the password by performing Resetting the Password for a FlexusL Instance for logging in to the new OS. If you switch to an application image, reset the password only after the image with the pre-installed application is up and running, or the password reset may fail.
FAQs
- If you use a Linux private image to change the OS of a FlexusL instance and the private image is created from a server on another cloud platform or downloaded from a third party, the image may not have the password reset plug-in installed. As a result, the password reset function is unavailable. To install the plug-in, refer to the following:
- What Should I Do If the Password Cannot Be Reset After I Use a Private Linux Image to Create a FlexusL Instance or Change the OS of an Existing Instance and I Forgot the Initial Password of the Private Image?
- What Should I Do If the Password Cannot Be Reset After I Use a Private Linux Image to Create a FlexusL Instance or Change the OS of an Existing Instance and I Know the Initial Password of the Private Image?
- If you use a private image to change the OS of a FlexusL instance, and the Host Security Service (HSS) is not protecting the instance, enable HSS by referring to What Do I Do If HSS Is Not Started After I Use a Private Image to Create a FlexusL Instance or Change the OS of an Instance?
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