Hi,
Follow the documentation :
nginx_daemon
Determines whether Nginx will run as a daemon or as a foreground process. Mainly useful for development or when running Kong inside a Docker environment.
See http://nginx.org/en/docs/ngx_core_module.html#daemon.
Default: on
But on the default docker images (centos and alpine) the first thing on docker-entrypoint.sh is:
set -e
export KONG_NGINX_DAEMON=off
Is not possible go on docker with KONG_NGINX_DAEMON on