Questions about hosting WebSocket NodeJS server on Azure

Question

Hello from France. I would like to migrate a NodeJS socket webserver from a local Linux virtual machine to Azure, but I am not sure of which architecture I should chose as I've been said that Azure limits the number of WebSocket connections (actually, my website can welcome from 10 to 100 concurrent users, each holding his own WebSocket connection). Taking into account that the said website is totally free and is not designed to generate profits, would you have any hint on what viable architecture/subscription plan I could/should chose if I decide to migrate to Azure?

Thank you very much in advance.

Answer 1

Hi,

Based on your concurrent WebSockets requirement the minimum Azure App Service SKU you could use would be Basic B1. Basic B1 supports up to 350 connections per instance, and you can have up to 3 instances if you scale out.

https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/azure-subscription-service-limits#app-service-limits

You will need to test by running your application under Basic B1 to see if it has enough power or you need larger size, if you need multiple instances or if one instance is enough, etc.

Please click Accept Answer if the above was useful.

Thanks.

-TP