On ubuntu, run etcd as a systemd unit

doc/running-on-ubuntu.md

 To run an IndieHosters on ubuntu 14.10 (earlier versions will not work), run something like:
 
-  apt-get update && apt-get -y upgrade
-  dpkg-reconfigure -plow unattended-upgrades
-  # set unattended upgrades to 'Yes'
-  apt-get -y install systemd-sysv git docker.io
-  docker run -d --restart='always' -p 4001:4001  quay.io/coreos/etcd:v0.4.6
-  echo "#!/bin/sh" > /usr/local/etcdctl
-  echo "docker run --net=host quay.io/coreos/etcd:v0.4.6 /etcdctl $1 $2 $3 $4" >> /usr/local/etcdctl
-  shutdown -r now
+````bash
+apt-get update && apt-get -y upgrade && apt-get -y dist-upgrade
+dpkg-reconfigure -plow unattended-upgrades
+# set unattended upgrades to 'Yes'
+apt-get -y install systemd-sysv git docker.io
+printf "#!/bin/sh\ndocker run --net=host quay.io/coreos/etcd:v0.4.6 /etcdctl $1 $2 $3 $4" >> /usr/local/etcdctl
+printf "[Unit]\nRequires=docker.service\nAfter=docker.service\n[Service]\nRestart=always\n\
+ExecStartPre=-/usr/bin/docker kill etcd\n\
+ExecStartPre=-/usr/bin/docker rm etcd\n\
+ExecStart=/usr/bin/docker run \
+  --name etcd \
+  -p 4001:4001 \
+  quay.io/coreos/etcd:v0.4.6\n\
+ExecReload=/usr/bin/docker restart etcd\n\
+ExecStop=/usr/bin/docker stop etcd\n\
+[Install]\n\
+WantedBy=multi-user.target\n" > /etc/systemd/system/etcd.service
+shutdown -r now
+````
 
-  systemctl start docker # This will be automatic once the IndieHosters unit-files are installed
-  systemctl list-units
-  docker ps
-  etcdctl ls
-  etcdctl help
+````
+systemctl enable etcd
+systemctl start etcd
+systemctl list-units
+docker ps
+etcdctl ls
+etcdctl help
+````
 
 Now follow the [CoreOS-based instructions](deploying-a-server.md)
+