expect具有非交互式功能

yum -y install expect

mkpasswd -l 20   #<==生成随机字符串，-l参数指定生成字符串的长度

非交互密钥分发

添加用户（所有机器）

useradd jiege1

echo 123456|passwd --stdin jiege1

id jiege1

10创建密钥对

su - jiege1

ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa>/dev/null 2>&1

10一键分发公钥expect脚本没指定主机

vim fenfa_sshkey.exp

#!/usr/bin/expect

if { $argc != 2 } {

  send_user"usage:expect fenfa_sshkey.exp file host\n"

  exit

}

#define var

set file [lindex $argv 0]

set host [lindex $argv 1]

set password "123456"

#spawn scp /etc/hosts root@10.0.0.142:/etc/hosts

#spawn scp -P6666 $file jiege1@$host:$dir

spawn ssh-copy-id -i $file "-p6666 jiege1@$host"

expect {

   "yes/no"   {send "yes\r";exp_continue}

   "*password"   {send "$password\r"}

}

expect eof

exit -onexit {

  send_user"jiege say good bye to you!\n"

}

expect fenfa_sshkey.exp .ssh/id_dsa.pub 192.168.169.11

#需手动输入公钥和ip，但是不用手动输yes和密码了（expect非交互式功能）可以把fenfa_sshkey.exp写入脚本一键实现集群通过主服务器ssh免密登入 

批量写入多台主机

vim fenfa_sshkey.sh

#!/bin/sh

. /etc/init.d/functions

for ip in 11 12 13 14 15

do

  expect fenfa_sshkey.exp ~/.ssh/id_dsa.pub 192.168.169.$ip >/dev/null 2>&1

  if [ $? -eq 0 ];then

     action "$ip" /bin/true

  else

     action "$ip" /bin/false

  fi

done

注意此脚本要和fenfa_sshkey.exp一个目录