# huaweicloud-solution-batch-reinstall-os-en

**Repository Path**: HuaweiCloudDeveloper/huaweicloud-solution-batch-reinstall-os-en

## Basic Information

- **Project Name**: huaweicloud-solution-batch-reinstall-os-en
- **Description**: This solution uses a FunctionGraph function to change or reinstall the OS of multiple Elastic Cloud Servers (ECSs).

- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master-dev
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2023-08-01
- **Last Updated**: 2025-06-16

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

[TOC]

**Solution Overview**
===============
This solution uses a FunctionGraph timer trigger to periodically change or reinstall the OS of multiple Elastic Cloud Servers (ECSs).
For details, visit https://www.huaweicloud.com/intl/en-us/solution/implementations/roecs.html.

**Architecture**
---------------
![Architecture](./document/batch-reinstall-os.png)

**Architecture Description**
---------------
This solution will:

1. Create the required function dependency with the Python SDK of ECS.

2. Create a FunctionGraph function to call the ECS API used to reinstall or change the OS.

3. Create a timer to periodically invoke the function code.

4. Create an agency in Identity and Access Management (IAM) to delegate FunctionGraph to access ECS in the relevant region.

**File Structure**
---------------
``` lua
huaweicloud-solution-batch-reinstall-os-at-scheduled-time
├── batch-reinstall-os.tf.json -- Resource orchestration template
├── functiongraph
    ├── batch-reinstall-os.py  -- Function file
```
**Getting Started**
---------------
1. Log in to the Huawei Cloud console, search for FunctionGraph, and go to the function list.

    Figure 1 Huawei Cloud console~~~~

    ![Huawei Cloud console](./document/readme-image-001.png)

2. View the function created for this solution.

    Figure 2 Created function
    
    ![Created function](./document/readme-image-002.png)

3. Go to the function details page, and click Test. In the displayed dialog box, select blank-template, and click Create to create a test event.

    Figure 3 Function details page
    
    ![Function details page](./document/readme-image-003.png)

    Figure 4 Configuring a test event
    
    ![Configuring a test event](./document/readme-image-004.png)

4. On the function details page, click Test to invoke the function to reinstall or change the OS. If information similar to the following is returned, the execution is successful.

    Figure 5 Invoking a function
    
    ![Invoking a function](./document/readme-image-005.png)

    Figure 6 Execution successful
    
    ![Execution successful](./document/readme-image-006.png)

5. On the Monitoring tab, view the request logs about OS reinstallation.

    Figure 7 Request logs
    
    ![Request logs](./document/readme-image-007.png)

6. To reinstall or change the OS of other ECSs, go to the function details page, choose Configuration > Environment Variables, enter variable values, and click Save. Then invoke the function again by referring to Step 4.

    Figure 8 Setting environment variables
    
    ![Setting environment variables](./document/readme-image-008.png)