AMIMOTO-AMI comes ready with Multisite config settings. However, these settings are disabled by default.
Step 1: Log in as root user
$ sudo su -
Step 2: Edit NGINX Config
This file will either be the default file or a custom one you've created.
/etc/nginx/conf.d/default.backend.conf
or
/etc/nginx/conf.d/example.com.backend.conf
Next, locate the line for wp-single-site and comment that out and uncomment the line wp-multisite-subdir.
server {
listen unix:/var/run/nginx-backend.sock default;
server_name example.com;
root /var/www/vhosts/example.com;
index index.php index.html index.htm;
access_log /var/log/nginx/example.com.backend.access.log backend;
keepalive_timeout 25;
port_in_redirect off;
gzip off;
gzip_vary off;
#include /etc/nginx/wp-singlesite;
include /etc/nginx/wp-multisite-subdir;
}
Step 3: Restart NGINX
For these change to take effect, restart NGINX.