wordpress-discovery@.service

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

# Requirements
Requires=etcd.service
Requires=wordpress@%i.service

# Dependency ordering and binding
After=etcd.service
After=wordpress@%i.service
BindsTo=wordpress@%i.service

[Service]

EnvironmentFile=/etc/environment
TimeoutStartSec=0
# Start
## Test whether service is accessible and then register useful information
ExecStart=/bin/bash -c '\
  sleep 3; \
  while true; do \
    app=`echo %p | cut -d"-" -f1`; \
    ip=`docker inspect --format \'{{.NetworkSettings.IPAddress}}\' $app-%i`; \
    curl -f $ip; \
    if [ $? -eq 0 ]; then \
      etcdctl set /services/$app/%i \'{"ip":"\'$ip\'", "port":"80"}\' --ttl 30; \
    else \
      etcdctl rm /services/$app/%i; \
    fi; \
    sleep 20; \
  done'

# Stop
ExecStop=/bin/bash -ceux '\
  app=`echo %p | cut -d"-" -f1`;\
  /usr/bin/etcdctl rm /services/$app/%i