discovery@.service

[Unit]
Description=%p for %i etcd registration

# Requirements
Requires=etcd.service

# Dependency binding
BindsTo=web@%i.service

[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/bash -euxc ' \
  ip=`docker inspect --format \'{{.NetworkSettings.IPAddress}}\' %i`; \
  etcdctl --peers 172.17.42.1:4001 set /services/web/%i \'{"ip":"\'$ip\'", "port":"80"}\';'
ExecStop=-/usr/bin/etcdctl rm /services/web/%i