All services like NGINX, PHP-FPM, MySQL, Varnish, Elasticsearch are managed via supervisord.
All services except postfix are automatically started when the container is being started.
In the following file
/etc/supervisor/conf.d/supervisord.conf you find all services defined.
With the command
supervisorctl you see the Status, PID and Uptime of all services:
Restarting a Service
supervisorctl you can start, stop and restart services like Varnish for example:
For each service, you find a log file in the following directory:
/var/log/supervisor/ that can be tailed: