How to increase FastCGI max_size limit?

Hi, @eris
How to increase FastCGI max_size for permanent for all domain?
when i run grep fastcgi_cache_path /etc/nginx/nginx.conf

fastcgi_cache_path              /var/cache/nginx/micro levels=1:2 keys_zone=microcache:10m inactive=30m max_size=1024m;

max_size=1024m i want to change it to 2048m for permanent and for all domains.

Is it safe to increase for 4GB,80GB vps?

Thank you

We create separate configs and folders for each website and there it is hard coded at the moment…

ok, then how to change temporary for domains?