linux 配置ssh免密码登录脚本

首先安装expect

yum install expect
yum install expect-devel
yum install tcl

ssh-keygen -t rsa -P '' -f /home/dp/.ssh/id_rsa

cat /home/dp/.ssh/id_rsa.pub >/home/dp/.ssh/authorized_keys

#上面是自动生成公钥和私钥。不需要三次回车

chmod 600 /home/dp/.ssh/id_rsa
chmod 644 /home/dp/.ssh/authorized_keys

cat /home/dp/ip.txt|while read line //里面有账号与密码

ip=`echo $line|awk '{print $1}'` #把赋给ip
echo $ip
pw=`echo $line|awk '{print $2}'` #把密码赋给变量pw
echo $pw
command1="ssh-copy-id -i /home/dp/.ssh/authorized_keys dp@$ip:/home/dp/" #这里使用-i指定文件，和使用的绝对路径，就是怕其他错误的麻烦。这个命令复制公钥比使用scp简单。

expect -c "

spawn $command1;

expect {

"password:" {send"$pw "; exp_continue}

"connecting(yes/no)?" {send "yes "; exp_continue}

}

"
done

ssh -t -p 22 dp@$ip 'sed -i"s/^#RSAAuthentication yes/RSAAuthentication yes/g"/etc/ssh/sshd_config'

ssh -t -p 22 dp@$ip 'sed -i"s/^#PubkeyAuthentication yes/PubkeyAuthentication yes/g"/etc/ssh/sshd_config'

ssh -t -p 22 dp@$ip 'sed -i"s/^#PermitRootLogin yes/PermitRootLogin yes/g"/etc/ssh/sshd_config

chmod 644 /home/dp/.ssh/authorized_keys