问题描述：
测试过程中直接覆盖了hosts

SSH_CMD "systemctl stop firewalld;iptables -F;yum install nfs-utils -y;mkdir /home/nfs;chmod 777 /home/nfs;
    mv /etc/exports /etc/exports.bak;echo \\\"${NODE1_IPV4} ${host_name}\\\" >/etc/hosts;

修复方法：
追加修改hosts文件

SSH_CMD "systemctl stop firewalld;iptables -F;yum install nfs-utils -y;mkdir /home/nfs;chmod 777 /home/nfs;
    mv /etc/exports /etc/exports.bak;echo \\\"${NODE1_IPV4} ${host_name}\\\" >>/etc/hosts;