gistfile1.txt

[Unit]
Description=VIS django discovery service

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

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

[Service]

# Get CoreOS environmental variables
EnvironmentFile=/etc/environment

# Start
## Test whether service is accessible and then register useful information
ExecStart=/bin/bash -c '\
  while true; do \
    status=$(curl -s -o /dev/null -w "%{http_code}" http://${COREOS_PUBLIC_IPV4}:8080/); \
    if [ $status -eq 200 ]; then \
      etcdctl set /services/django/${COREOS_PUBLIC_IPV4} \'{"hostname": "%H", "ipv4_addr": "${COREOS_PUBLIC_IPV4}", "port": "8080"}\' --ttl 30; \
    else \
      etcdctl rm /services/django/${COREOS_PUBLIC_IPV4}; \
    fi; \
    sleep 20; \
  done'

# Stop
ExecStop=/usr/bin/etcdctl rm /services/django/${COREOS_PUBLIC_IPV4}

[X-Fleet]
# Schedule on the same machine as the associated django service
X-ConditionMachineOf=django@%i.service