Ssh_key免秘钥登录

[root@manager ~]# cat /etc/redhat-release
CentOS release 6.7 (Final)
[root@manager ~]#

[root@manager ~]# uname -r
2.6.32-573.el6.x86_64
[root@manager ~]#

[root@manager ~]# wget -O /etc/yum.repos.d/epel.repohttp://mirrors.aliyun.com/repo/epel-6.repo
[root@manager ~]# yum -y clean all
[root@manager ~]# yum makecache

[root@manager ~]#yum -y install sshpass

[root@manager ~]# ssh-keygen -t dsa -f ~/.ssh/id_dsa -P ""
Generating public/private dsa key pair.
/root/.ssh/id_dsa already exists.
Overwrite (y/n)? y
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
6d:53:4b:e8:73:76:be:68:d1:95:71:38:b2:f3:fc:0e root@manager
The key's randomart image is:
+--[ DSA 1024]----+
| . |
| .. o..|
| . oo .+|
| o oo. ..|
| S * +=.. |
| . =.o+ |
| .E. |
| .. o.|
| .. ...|
+-----------------+
[root@manager ~]#
命令说明：
ssh-keygen:生成密钥对命令
-t：指定密钥对的密码加密类型（rsa，dsa两种）
-f：指定密钥对文件的生成路径包含文件名
-P（大写）：指定密钥对的密码

[root@manager ~]# sshpass -p "ssh登录密码" ssh-copy-id -i ~/.ssh/id_dsa.pub "-o StrictHostKeyChecking=no root@192.168.1.89"
Now try logging into the machine, with "ssh '-o StrictHostKeyChecking=no root@192.168.1.89'", and check in: .ssh/authorized_keysto make sure we haven't added extra keys that you weren't expecting.[root@manager ~]#
命令说明：
sshpass：专为ssh连接服务的免交户工具
-p ：指定登录的密码
ssh-copy-id：自动分发公钥的工具
-i：指定公钥路径
-o StrictHostKeyChecking=no :不进行对方主机信息的写入（第一次ssh连接会在know_hosts文件里记录）

[root@manager ~]# ssh root@192.168.1.89
Last login: Tue Jul 25 00:05:15 2017 from manager
[root@web2 ~]#

#!/bin/bash
# author:Mr.chen
# 2017-3-14
# description:SSH密钥批量分发User=root
passWord=123.asdfunction YumBuild(){echo "正在安装epel源yum仓库，请稍后..."
cd /etc/yum.repos.d/ &&\
[ -d bak ] || mkdir bak
[ `find ./*.* -type f | wc -l` -gt 0 ] && find ./*.* -type f | xargs -i mv {} bak/
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo &>/dev/null
yum -y clean all &>/dev/null
yum makecache &>/dev/null}echo "正在进行网络连接测试,请稍后..."
ping www.baidu.com -c2 >/dev/null ||(echo "无法连同外网，本脚本运行环境必须和外网相连！" && exit)
[ $# -eq 0 ] && echo "没有参数！格式为：sh $0 参数1...n" && exit
rpm -q sshpass &>/dev/null || yum -y install sshpass &>/dev/null
if [ $? -gt 0 ];then
YumBuild
yum -y install sshpass &>/dev/null || (echo "sshpass build error！" && exit)
fi
[ -d ~/.ssh ] || mkdir ~/.ssh;chmod 700 ~/.ssh
echo "正在创建密钥对...."
rm -rf ~/.ssh/id_dsa ~/.ssh/id_dsa.pub
ssh-keygen -t dsa -f ~/.ssh/id_dsa -P "" &>/dev/null
for ip in $*
do
ping $ip -c1 &>/dev/null
if [ $? -gt 0 ];then
echo "$ip无法ping通请检查网络"
continue
fi
sshpass -p "$passWord" ssh-copy-id -i ~/.ssh/id_dsa.pub "-o StrictHostKeyChecking=no ${User}@$ip" &>/dev/null
echo "$ip 密钥分发成功"
done

[root@manager scripts]# sh ssh_key.sh 192.168.1.88 192.168.1.89
正在进行网络连接测试,请稍后...
正在创建密钥对....
192.168.1.88 密钥分发成功
192.168.1.89 密钥分发成功
[root@manager scripts]#
[root@manager scripts]# ssh root@192.168.1.89
Last login: Tue Jul 25 01:07:13 2017 from 192.168.1.225
[root@web2 ~]#