I'm facing a timeout error with my Azure Flex Consumption Python Functions deployment. Even though the function runs successfully after being deployed, my Azure CLI command fails, disrupting my CI/CD pipeline. Here are some details to provide more context:
- **Environment Setup:** I'm using Flex Consumption for my function, which is located in Subnet A of my virtual network (VNet). I have set up private endpoints for additional services in other subnets (B, C, D) so they can communicate with the functions.
- **Access Control:** I've ensured all access setups for function storage and queue-triggered storage are correct, including KeyVault access.
- **Function Details:** My function app utilizes a FastAPI extension for streaming, mainly for Generative AI applications.
**Key Issue:** When I include the private endpoints, the CLI deployment fails with an HttpClient.Timeout error after 100 seconds, although removing the private endpoints allows the deployment to succeed. Do I need to configure specific NSG rules for the subnet hosting my private endpoints to enable communication with the Flex Consumption plan's subnet? I opted not to use Application Security Groups to simplify the setup.
I recently made some changes to my setup, such as moving my private endpoint to a different subnet to limit API access. Azure documentation suggests that they manage private endpoint communications automatically, which casts doubt on whether I need to take additional steps like NSG configurations. I also added the FastAPI extension, which might be affecting the worker operations during deployment.
3 Answers
It sounds like you're on the right track! Since Azure manages private endpoint comms, you generally shouldn't need to set complex networking rules unless there are specific restrictions in place. Just double-check if the NSG on your Flex Consumption subnet permits traffic from your private endpoint subnet. Regarding FastAPI, while it can introduce complexities, it's less likely to cause a timeout unless there are underlying network restrictions causing delays.
To tackle the timeout issue, first, check your function's outbound connectivity. If it's only allowed to access specific subnets within your VNet, ensure those subnets have proper routing and connectivity to your Flex Consumption plan. As for the NSG rules, it might be necessary to create exceptions to allow traffic between those subnets since private endpoints don't automatically guarantee access across all subnets. You might not need ASGs right now, but make sure the existing NSG rules allow the communications you're looking for.
I've had similar issues in the past. One thing to try is to temporarily increase the timeout setting in your deployment script while you troubleshoot the cause of the failure. Sometimes, the deployment package might take longer to process due to network latency or other environmental factors. Just make sure to monitor logs closely for any signs of failure during those longer timeouts.
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