linux免密登录 .ssh 密钥

1、密钥对制作

yum -y install sshpass

免交互创建密钥对

ssh-keygen -t dsa -f ~/.ssh/id_dsa -P ""
ll .ssh/

2、密钥分发

ssh-copy-id -i ~/.ssh/id_rsa.pub -o StrictHostKeyChecking=no -p50022 [email protected].$ip

免交互方式批量分发公钥

##!/bin/bash
##	create key pair
#rm -fr /root/.ssh/id_dsa*
#ssh-keygen -t dsa -f /root/.ssh/id_dsa -P ""  -q
# 	fenfa key file
for ip in 100 110
do
	echo "=======Batch the file to the host 10.1.3.$ip=========="	
sshpass -p50022 ssh-copy-id -i /root/.ssh/id_dsa.pub "-o StrictHostKeyChecking=no  [email protected].$ip"
	echo  -e "##########################END##########################\n"
done

3、配置文件权限

chmod 700 /home/用户名/.ssh
chmod 600 authorized_keys

A要免密连接B，A要把自己的公钥发送给B的authorized_keys里。