Install latest docker in CoreOS stable

install-latest-docker.bash

mkdir -p /etc/systemd/system/docker.service.d
cat > /etc/systemd/system/docker.service.d/10-docker-latest.conf <<EOF
[Service]
ExecStartPre=/bin/bash -ec "test -f /var/lib/docker-latest || /usr/bin/curl -L -o /var/lib/docker-latest https://get.docker.com/builds/Linux/x86_64/docker-latest && /usr/bin/chmod +x /var/lib/docker-latest"
ExecStart=
ExecStart=/var/lib/docker-latest daemon --host=fd:// $DOCKER_OPTS $DOCKER_OPT_BIP $DOCKER_OPT_MTU $DOCKER_OPT_IPMASQ
EOF

cat > /etc/systemd/system/usr-bin-docker.mount <<EOF
[Unit]
#!/bin/bash
Requires=docker.service
After=docker.service

[Mount]
What=/var/lib/docker-latest
Where=/usr/bin/docker
Options=bind
EOF

systemctl daemon-reload
systemctl restart docker
systemctl restart usr-bin-docker.mount