Cloud Modernization with C++: Migrating Legacy Applications to the Cloud

The best way to move legacy C++ applications to the cloud: Re-platforming: Migrate application code to a cloud-native platform such as Kubernetes, leveraging cloud services. Cloudization: Deploy applications on cloud platforms and utilize cloud services without code refactoring.

Cloud Modernization with C++: Migrating Legacy Applications to the Cloud

As enterprises accelerate their digital transformation journeys, cloud modernization has become a top priority. For legacy C++-based applications, migrating them to the cloud can bring significant benefits, such as scalability, agility, and cost optimization.

Migration Methods

There are two common methods for migrating C++ applications to the cloud:

• Replatforming: Move the application Code is migrated to cloud-native platforms such as Kubernetes and leverages cloud services.
• Cloudification: Deploy applications on cloud platforms and utilize cloud services without code refactoring.

Which method you choose depends on the complexity of your application and your business needs.

Practical case

Application: Large bank mobile application, C++ backend

Migration method: Re-platforming

Containerize applications with Kubernetes and leverage Azure Functions for serverless computing.

Step One: Containerize the backend code

// 创建一个 Dockerfile
FROM ubuntu:18.04
RUN apt-get update && apt-get install -y make g++
WORKDIR /app
COPY . /app
CMD make && ./app

Step Two: Deploy to Kubernetes

apiVersion: v1
kind: Pod
metadata:
  name: my-app
  labels:
    app: my-app
spec:
  containers:
  - name: my-app
    image: my-app:latest
    env:
    - name: API_URL
      value: https://my-api.com

Step Three: Leverage Serverless Computing

// Azure Functions script
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using System.Threading.Tasks;

namespace MyFunctions;

public static class MyFunction
{
    [FunctionName("GetAccountBalance")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Function, "get", Route = "accounts/{accountId}")] HttpRequest req,
        string accountId,
        ILogger log)
    {
        // 从数据库获取账户余额

        return new OkObjectResult(balance);
    }
}

By following these steps, banks can modernize their mobile application’s C++ backend to the cloud, taking advantage of the benefits of cloud technology.

Benefits

• Scalability: The cloud platform provides on-demand scaling to meet changing workloads.
• Agility: Cloud services make rapid deployment and updates possible, thereby increasing development efficiency.
• Cost Optimization: The pay-as-you-go model reduces infrastructure costs and optimizes based on usage.
• Resilience: The cloud platform provides a fault-tolerant mechanism to ensure that applications maintain high availability in the face of interruptions.

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