多台LINUX主机SSH登录密钥认证的配置

首先在服务器上生成密钥，ssh-keygen -t rsa，输入密码等，或留空，例如生成了/root/.ssh/id_rsa_cenosb.pub文件

将要SSH远程连接的所有主机的IP,用户名，密码写在同一目录的pwd.txt,以空格作为分隔符，搞定以后可以删除

脚本如下

#!/bin/bash
a=`cat /root/.ssh/id_rsa_cenosb.pub`
cat pwd.txt | while read line
do
hostip=`echo $line | cut -d" " -f1`
uname=`echo $line | cut -d" " -f2`
pwd=`echo $line | cut -d" " -f3`
/usr/bin/expect <<-EOF
 set time 30
 spawn ssh $uname@$hostip
 expect {
 "*yes/no" { send "yes\r"; exp_continue }
"*password:" { send "$pwd\r" }
}
expect "*#"
send "echo $a >> /root/.ssh/authorized_keys\r"
expect "*#"
send "exit\r"
interact
expect eof
EOF
#echo "$pwd"




done