How does nginx digest 1000 configs with domains with ssl certificates?

Question

Nginx

Has anyone tried to keep such a volume of certificates in it?
How does it affect performance?
How fast is the restart?

Answer 1

Logic suggests that it will not affect in any way - the volumes (in megabytes) are not the same. More memory will have to be allocated to load keys into it, that's all.

Answer 2

On some nodes, nginx (nginx/1.15) starts with 20k+ certificates and configs, and it works fine. But there is an anomaly - a memory leak during nginx reloads. If you often do nginx reload, then nginx will start eating RAM and not giving it away. After hundreds of reloads, nginx can consume 20G of RAM. Only a full restart helps.