Hello everyone,
Are there any maximum value for managed Instances by Certify Management Hub?
If not, maybe any guidelines about performance / required memory/CPU?
I had a look in the support page but didn’t found any answer (sorry if I missed it).
Thank you for your help
In our own testing we’ve tried it with 250 instances without any issues but it will also depends how many managed certificates each instance is working with.
The hub uses SignalR connections (web sockets, outgoing from each client to the hub API) to maintain communication with instances and I think you could start to need to adapt configuration once you get to about 1000 instances but we haven’t tested at that scale yet and it’ll depend if you hub is running on Windows or other platforms. For scale testing we find it easiest to spin up linux containers in docker etc.
A basic hub runs on about 150MB or so of RAM. CPU isn’t really an issue. We recently also tested with 10,000 managed certificates on a single instance and I think that used about 3.5 GB of ram at peak.
What kind of scale are you looking at having?
Thank you for your message.
I expected the 250 with the (very) recent license adjustment to 250.
I think we will reach max. 500, but with less than 10 cert. per instance.
Containers should not be an issue (we would run it on Azure).
If there is no license cap at least, we can start progressively and observe the behavior with the scaling 
Also if you are running mainly with Windows hosts it’s beneficial to also have your hub be running on Windows, that way you can use windows specific functionality.