Calico is not a network overlay

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

@@ -0,0 +1,17 @@
+[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