nginx: [emerg] zero size shared memory zone "one"

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: [emerg] zero size shared memory zone "one"
nginx: configuration file /etc/nginx/nginx.conf test failed

上記エラーはlimit_req_zoneが定義されていない場合にエラーが発生します

nginx.conf

http{
    ...
    limit_req_zone $remote_addr$http_x_forwarded_for zone=one:10m rate=100r/s;
    ...
}