Are you struggling to build secure, low-latency APIs on Azure without spinning up expensive always-on infrastructure? Traditional serverless models like the Azure Functions Consumption Plan are great for scaling, but they fall short when it comes to VNET integration and consistent low latency. Enterprises often need to connect serverless APIs to internal databases or secure networks — and until recently, that meant upgrading to Premium Plans or sacrificing the cost benefits of serverless. That’s where the Azure Functions Flex Consumption Plan changes the game. It brings together the elasticity of serverless, the security of VNETs, and latency performance that matches dedicated infrastructure — all while keeping your costs optimized. What is Azure Functions Flex Consumption? Azure Functions Flex Consumption is the newest hosting plan designed to power enterprise-grade serverless applications. It offers more control and flexibility without giving up the pay-per-use efficiency of the traditional Consumption Plan. Key capabilities include: Why This Matters APIs are the backbone of every digital product. In industries like finance, retail, and healthcare, response times and data security are mission critical. Flex Consumption ensures your serverless APIs are always ready, fast, and safely contained within your private network — ideal for internal or hybrid architectures. VNET Integration: Security Without Complexity Security has always been the biggest limitation of traditional serverless plans. With Flex Consumption, Azure Functions can now run inside your Virtual Network (VNET). This allows your Functions to: In short: You can now build fully private, VNET-secure APIs without maintaining dedicated infrastructure. Building a VNET-Secure Serverless API: Step-by-Step Step 1: Create a Function App in Flex Consumption Plan Step 2: Configure VNET Integration Step 3: Deploy Your API CodeUse Azure DevOps, GitHub Actions, or VS Code to deploy your function app just like any other Azure Function. Step 4: Secure Your API How It Compares to Other Hosting Plans Feature Consumption Premium Flex Consumption Auto Scale to Zero ✅ ❌ ✅ VNET Integration ❌ ✅ ✅ Cold Start Optimized ⚠️ ✅ ✅ Cost Efficiency ⭐⭐⭐⭐ ⭐⭐ ⭐⭐⭐⭐ Enterprise Security ❌ ✅ ✅ Flex Consumption truly combines the best of both worlds – the agility of serverless and the power of enterprise networking. Real-World Use Case Example A large retail enterprise needed to modernize its internal inventory API system.They were running on Premium Functions Plan for VNET access but were overpaying due to idle resource costs. After migrating to Flex Consumption, they achieved: This allowed them to maintain compliance, improve responsiveness, and simplify their architecture — all with minimal migration effort. To conclude, in today’s API-driven world, you shouldn’t have to choose between speed, cost, and security. With Azure Functions Flex Consumption, you can finally deploy VNET-secure, low-latency serverless APIs that scale seamlessly and stay protected inside your private network. Next Step:Start by migrating one of your internal APIs to the Flex Consumption Plan. Test the latency, monitor costs, and see the difference in performance. We hope you found this blog useful, and if you would like to discuss anything, you can reach out to us at transform@cloudFronts.com

Building low-latency, VNET-secure APIs with Azure Functions Flex Consumption is only the beginning.The next step toward modernization is setting up a DevOps release pipeline that automatically deploys your Function Apps-even across multiple regions – using Azure CLI. In this blog, we’ll explore how to implement a CI/CD pipeline using Azure DevOps and Azure CLI to deploy Azure Functions (Flex Consumption), handle cross-platform deployment scenarios, and ensure global availability. Step-by-Step Guide: Azure DevOps Pipeline for Azure Functions Flex Consumption Step 1: Prerequisites You’ll need: Step 2: Provision Function Infrastructure Using Azure CLI Step 3: Configure Azure DevOps Release Pipeline Important Note: Windows vs Linux in Flex Consumption While creating your pipeline, you might notice a critical difference: The Azure Functions Flex Consumption plan only supports Linux environments. If your existing Azure Function was originally created on a Windows-based plan, you cannot use the standard “Azure Function App Deploy” DevOps task, as it assumes Windows compatibility and won’t deploy successfully to Linux-based Flex Consumption. To overcome this, you must use Azure CLI commands (config-zip deployment) — exactly as shown above — to manually upload and deploy your packaged function code. This method works regardless of the OS runtime and ensures smooth deployment to Flex Consumption Functions without compatibility issues. Tip: Before migration, confirm that your Function’s runtime stack supports Linux. Most modern stacks like .NET 6+, Node.js, and Python run natively on Linux in Flex Consumption. Step 4: Secure Configurations and Secrets Use Azure Key Vault integration to safely inject configuration values: Step 5: Enable VNET Integration If your Function App accesses internal resources, enable VNET integration: Step 6: Multi-Region Deployment for High Availability For global coverage, you can deploy your Function Apps to multiple regions using Azure CLI: Dynamic Version (Recommended): This ensures consistent global rollouts across regions. Step 7: Rollback Strategy If deployment fails in a specific region, your pipeline can automatically roll back: Best Practices a. Use YAML pipelines for version-controlled CI/CDb. Use Azure CLI for Flex Consumption deployments (Linux runtime only)c. Add manual approvals for productiond. Monitor rollouts via Azure Monitore. Keep deployment scripts modular and parameterized To conclude, automating deployments for Azure Functions Flex Consumption using Azure DevOps and Azure CLI gives you: If your current Azure Function runs on Windows, remember — Flex Consumption supports only Linux-based plans, so CLI-based deployments are the way forward. Next Step:Start with one Function App pipeline, validate it in a Linux Flex environment, and expand globally. For expert support in automating Azure serverless solutions, connect with CloudFronts — your trusted Azure integration partner. We hope you found this blog useful, and if you would like to discuss anything, you can reach out to us at transform@cloudfronts.com