CoreOS Cluster Service

#############################
# apache.service
#############################
[Unit]
Description=My Apache Frontend
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/bin/docker run --name apache -p 80:80 coreos/apache /usr/sbin/apache2ctl -D FOREGROUND
ExecStop=/usr/bin/docker stop apache

[X-Fleet]
X-Conflicts=apache@*.service

#############################
# apache-discovery.service
#############################
[Unit]
Description=Announce Apache 1
BindsTo=apache@1.service

[Service]
ExecStart=/bin/bash -c "HOST_IP=$(/bin/ifconfig enp0s8 | awk '/inet /{print $2}') && CONTAINER_PORT=$(docker inspect apache | grep -m 1 HostPort | tr -d ' ' | cut -d: -f2 | tr -d '\"') && while true; do etcdctl set /services/web/%H \"{ \\\"host\\\": \\\"$HOST_IP\\\", \\\"port\\\": \\\"$CONTAINER_PORT\\\"}\" --ttl 60;sleep 45;done"
ExecStop=/usr/bin/etcdctl rm /services/web/%H

[X-Fleet]
X-ConditionMachineOf=apache@1.service