sudo yum install httpd-tools
sudo htpasswd -c /etc/nginx/conf.d/vhosts/.htpasswd USERNAME
Enter Password: xxxxx
sudo chmod 644 /etc/nginx/conf.d/vhosts/.htpasswd
Update the domain.conf file like /etc/nginx/conf.d/vhosts/myrestricteddomain.com.ssl.conf
Ideally, use it in server config
server {
satisfy all;
auth_basic "Restricted Area";
auth_basic_user_file /etc/nginx/conf.d/vhosts/.htpasswd;
location / {
Save and restart nginx