配置ssh免密登录
ssh-keygen 产生公钥与私钥对.
ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中,ssh-copy-id也能让你有到远程机器的home, ~./ssh , 和 ~/.ssh/authorized_keys的权利
# 有询问的话一路回车,这将在用户家目录~/.ssh/下生成一对密钥,其中id_rsa为私钥,id_rsa.pub为公钥
ssh-keygen -t rsa
# 假设被控端的IP为192.168.0.21
ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.21