kubespray/roles/network_plugin/templates/flannel/systemd-docker.service.j2

[Unit]
Description=Docker Application Container Engine
Documentation=http://docs.docker.com
After=network.target docker.socket flannel.service
Requires=docker.socket

[Service]
EnvironmentFile=/run/flannel/subnet.env
EnvironmentFile=-/etc/default/docker
ExecStart=/usr/bin/docker -d -H fd:// --bip=${FLANNEL_SUBNET} --mtu=${FLANNEL_MTU} $DOCKER_OPTS
MountFlags=slave
LimitNOFILE=1048576
LimitNPROC=1048576
LimitCORE=infinity

[Install]
WantedBy=multi-user.target