1. EOF 输入

https://kubernetes.io/docs/setup/independent/install-kubeadm/#installing-kubeadm-kubelet-and-kubectl

root@km:/opt/cni/bin# cat <<EOF >/etc/cni/net.d/10-flannel.conf
{
"name": "cbr0",
"type": "flannel",
"delegate": {
    "isDefaultGateway": true
}
}
EOF
root@km:/opt/cni/bin#