gentoo-overlay/app-emulation/flannel/files/flanneld.service

[Unit]
Description=Flanneld overlay address etcd agent
After=network.target
Before=docker.service

[Service]
Type=notify
Environment=FLANNEL_ETCD=http://127.0.0.1:4001 FLANNEL_ETCD_KEY=/coreos.com/network
ExecStart=/usr/bin/flanneld -etcd-endpoints=${FLANNEL_ETCD} -etcd-prefix=${FLANNEL_ETCD_KEY} $FLANNEL_OPTIONS
ExecStartPost=/usr/libexec/flannel/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/docker

[Install]
RequiredBy=docker.service