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Learn how to smoothly migrate your Docker multi-container applications to Azure using Azure WebApps for Containers instead of Azure Container Instances.
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Migrate Your Docker Multi-Container App to Azure: A Step-by-Step Guide

Migrating your Docker multi-container application to the cloud can feel daunting, especially when considering factors like container orchestration and volume management. If you’ve been running Docker on a Linux CentOS host and are ready to transition to a more flexible and scalable platform, this guide is for you! We will explore how to migrate your multi-container apps to Azure, focusing on the benefits of using Azure WebApps for Containers.

Understanding the Scenario

You have a successful setup with Docker Ce, where multiple containers run your web apps via docker-compose on a CentOS host. As your project grows, you may find it beneficial to leverage Azure’s serverless capabilities. However, you’re left wondering how to handle the migration of these containers and their attached data volumes.

Key Questions Raised

How can you migrate all your containers seamlessly?

Will creating an Azure Container Registry and pushing containers to it migrate your data volumes as well?

What is the best approach for a smooth transition?

Why Azure WebApps for Containers?

Although Azure Container Instances may initially seem like the go-to service for simple container deployments, Azure WebApps for Containers provide a more robust framework for hosting multi-container applications with additional features like easy scaling, built-in load balancing, and integration with other Azure services.

Benefits of Using Azure WebApps for Containers:

Ease of Use: Simplifies the deployment process with straightforward configurations.

Scalability: Automatically scale your applications based on demand.

Cost-Effective: Reduce costs with only pay-as-you-go pricing.

Integrated Services: Use Azure’s powerful services like databases or storage seamlessly.

Migration Steps to Azure WebApps for Containers

Migrating your multi-container app involves several steps. Here’s a breakdown of the process:

Step 1: Prepare Your Application

Audit Existing Containers: Review your current containers and their configurations. Take note of the dependencies and environment variables.

Docker Compose Configuration: Ensure your docker-compose.yml is adapted for Azure, as it will be used to define your application for deployment.

Step 2: Create an Azure Container Registry (ACR)

Set Up ACR: Go to the Azure portal, create a new Container Registry, and set it up according to your organization’s naming conventions.

Log In to ACR: Use Azure CLI or the Azure Portal to log into your Azure Container Registry.

Step 3: Build and Push Your Containers

Build Your Images: Use Docker to build your images based on your updated configurations.

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Log into ACR:

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Push Your Images: Next, push your images to the Azure Container Registry.

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Step 4: Deploy Your Application on Azure WebApps for Containers

Create a New Web App: In Azure, create a new Web App, choosing the "Docker" option.

Configure Containers: Under the settings, input the necessary information for the images you have just pushed to your Azure Container Registry.

Environment Variables: Enter any required environment variables that your application needs to run correctly.

Step 5: Managing Data Volumes

Persistent Storage: If your application is dependent on stateful storage, consider using Azure File Storage or Azure Blob Storage to handle your application data.

Data Migration: Manually transfer data from your local Docker data volumes to Azure Blob or Files, or sync data as needed.

Final Thoughts

Migrating your multi-container app to Azure can sign