[系统运维]shell实现ssh批量免密登录操作

1、ip.txt

vi /root/shell/ip.txt

#IP 用户名 密码；空格隔开
changxin-132 root Api03132
changxin-133 root Api03133
changxin-134 root Api03134
changxin-135 root Api03135

2、ssh-auto.sh
版本-1

#!/bin/bash

while read line
do
	#获取IP
	ip=`echo $line | cut -d " " -f1`
	#获取用户名
	user_name=`echo $line | cut -d " " -f2`
	#获取密码
	pass_word=`echo $line | cut -d " " -f3`
	
#	echo $ip $user_name $pass_word
	#生成ssh key
	if [[ ! -f "/$user_name/.ssh/id_rsa" ]]; then
		echo "gen ssh key   $ip"
		ssh-keygen -t rsa -b 2048 -N '' -f /$user_name/.ssh/id_rsa
	fi
	#检测是否安装 expect
	if  ! expect -v &>/dev/null;then
		echo "install expect  $ip"
		yum -y install expect
	fi
	#expect 交互过程
	expect << EOF
	#复制公钥到目标主机
	spawn ssh-copy-id -i /$user_name/.ssh/id_rsa.pub $user_name@$ip
	expect {
		"yes/no" {send "yes\n";exp_continue}
		"password" {send "$pass_word\n"}
	}
	expect eof
EOF
	
done < /root/shell/ip.txt

版本-2（未验证）

#!/bin/bash
# 生成ssh key
if [[ ! -f "/root/.ssh/id_rsa" ]];then
  echo "gen ssh key"
  ssh-keygen -t rsa -b 2048 -N '' -f /root/.ssh/id_rsa
fi
# 检测是否安装了 expect
if ! expect -v &>/dev/null;then
  echo "install expect"
  yum install expect -y
fi
# 循环文件中的ip
for p in $(cat host.txt|grep -v '#');do
  ip=$(echo "$p"|cut -f1 -d":")       # 取出当前IP
  password=$(echo "$p"|cut -f2 -d":") # 取出当前密码
  # expect 交互过程
  expect -c "
		spawn ssh-copy-id -i /root/.ssh/id_rsa.pub root@$ip
        expect {
                \"*yes/no*\" {send \"yes\r\"; exp_continue}
                \"*password*\" {send \"$password\r\"; exp_continue}
                \"*Password*\" {send \"$password\r\";}
        }
"

host.txt

#-----------
# ip:password
#192.168.1.110:7758521
#192.168.1.111:7758521
#192.168.1.112:7758521
#-----------

3、执行

#执行权限
chmod +x /root/shell/ssh-auto.sh
#执行脚本
sh ssh-auto.sh

4、ssh验证

ssh changxin-133 hostname