How to fix Legacy Apps that don’t work in the Cloud

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Configurare noua (How To)

Old apps usually break in the cloud. The fix: containerize them.

Steps:

Audit dependencies → e.g., app needs .NET 3.5 and SQL client.
Create a Dockerfile:

FROM mcr.microsoft.com/dotnet/framework/runtime:3.5 COPY . /app WORKDIR /app CMD ["MyLegacyApp.exe"]
Build & test locally:

docker build -t legacyapp . docker run legacyapp
Push to a registry:

docker tag legacyapp myrepo/legacyapp:latest docker push myrepo/legacyapp:latest
Deploy in the cloud (AWS ECS, Azure AKS, etc.).
Migrate database → e.g., mysqldump → import into AWS RDS.
Add autoscaling + load balancing.
Run cloud + on-prem apps side by side until stable.
Switch users to the cloud version.

Permanent

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