I'm working on several different webapps written in node. Each webapp has very little traffic (maybe a few HTTP requests per day) so I run them all on a single machine with haproxy as a reverse proxy. It seems each webapp is consuming almost 100MB RAM memory which adds up to a lot when you have many webapps. Because each webapp receives so little traffic I was wondering if there is a way to have all the webapps turned off by default but setup so that they automatically start if there is an incoming HTTP request (and then turn off again if there hasn't been any HTTP requests within some fixed time period).
Run many low traffic webapps on a single machine so that a webapp only starts when it is needed?
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Yes. These a dozen different ways to handle this. With out more details not sure the best way to handle this. One option is using node VM
https://nodejs.org/api/vm.htmlAnother would be some kind of Serverless setup. See:https://www.serverless.com/Honestly, 100MB is a drop in the bucket with ram prices these days. Quick google shows 16GB ram for $32 or to put that differently, 160 nodes apps. I'm guessing you could find better prices on EBay or a something like that.Outside learning this would be a total waste of time. Your time is worth more than the effort it would take to set this up. If you only make minimum wage in the US it'd take you less than 4 hours to make back the cost of the ram. Better yet go learn Docker/k8s and containerize each of those apps. That said learning Serverless would be a good use of time.