nginx -v
nginx version: nginx/1.13.7

# Server globals
user www-data;
worker_processes auto;
worker_rlimit_nofile 65535;
error_log /var/log/nginx/error.log crit;
pid /var/run/nginx.pid;


# Worker config
events {
worker_connections 1024;
use epoll;
multi_accept on;
}


http {

proxy_cache_path /home/admin/cachemaster levels=1:2 keys_zone=my_cache:100m max_size=1g inactive=60m use_temp_path=off;

}

server {
listen 107.170.204.190:443;
server_name sf1.example www.sf1.example;
ssl on;
ssl_certificate /home/admin/conf/web/ssl.sf1.example.pem;
ssl_certificate_key /home/admin/conf/web/ssl.sf1.example.key;
error_log /var/log/apache2/domains/sf1.example.error.log error;

location / {
proxy_cache my_cache;
proxy_set_header X-Real-IP $remote_addr;
proxy_cache_revalidate on;
proxy_cache_min_uses 3;
proxy_cache_valid 200 301 7d;
proxy_pass https://example:443;
proxy_ignore_headers X-Accel-Expires Expires Cache-Control;

}
}

but the folder /home/admin/cachemaster fills up beyond 1gb, what am i missing

Thanks