• 在nfs节点上安装nfs-kernel-server
• 并在所有节点上安装nfs-common，不安装会导致容器在某些节点上挂载nfs卷失败

sudo apt install nfs-kernel-server nfs-common
sudo mkdir -p /www/nfs-k8s
sudo bash -c 'echo "/www/nfs-k8s <client_ip>(rw,sync,no_subtree_check,no_root_squash)" >> /etc/exports'
exportfs -a
sudo systemctl restart nfs-kernel-server