[Unit]
Description=nginx

[Service]
ExecStartPre=docker pull nginx
ExecStart=docker run --name nginx --rm -p %1:80 nginx
ExecStartPost=etcdctl set /services/nginx ${COREOS_PUBLIC_IPV4}:%i
ExecStop=/usr/bin/docker kill nginx
ExecStopPost=/usr/bin/etcdctl rm /services/nginx

# %i => substituido pelo valor após o @, no caso valor 80
# ${COREOS_PUBLIC_IPV4} => IP público do servidor

# Registrar o service no cluster => fleetctl submit nginx.service
# Iniciar o service em um host do cluster => fleetctl start nginx.service