说假设有一个1000台节点的Hadoop集群，要配置节点之间的SSH免密码登录，该如何用shell脚本实现？
#!/bin/expect
#循环1000台机器的IP地址，生成密钥文件authorized_keys
for ip in {cat ip.list}
do
ssh user@$ip ssh-keygen -t rsa &>/dev/null
expect{
"yes/no" { send "yes\r";exp_continue}
"password:"{send "$passwd\r";exp_continue}
}
cat ~/.ssh/id_rsa.pub > ~/.ssh/authorized_keys &> /dev/null
exit
if [ !-f ~/.ssh/authorized_keys ];<br> then
touch ~/.ssh/authorized_keys<br> fi
ssh user@$ip cat ~/.ssh/authorized_keys >> ~/.ssh/authorized_keys &> /dev/null
expect{
"yes/no" { send "yes\r";exp_continue}
"password:"{send "$passwd\r";exp_continue}
}
done
#scp authorized_keys 文件到各台机器上面。
for ip in {cat ip.list}
do
scp ~/.ssh/authorized_keys user@$ip:~/.ssh/
expect{
"yes/no" { send "yes\r";exp_continue}
"password:"{send "$passwd\r";exp_continue}
}
done