linux ssh 免密码登陆

   我现在有三台机器分别是 master 、slave01、slave02  要配置这三台机器相互密码登陆

1、分别在这三台机器上机器输入：ssh-keygen -t rsa 生成密钥；

2、分别将公钥添加到authorized_keys中：cat  ~/.ssh/id_dsa.put  >>  ~/.ssh/authorized_keys

3、查看一下authorized_keys的内容: more   /root/.ssh/authorized_keys

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA7f3Ari4WVjeNL07beCY2lsOScF7HjKFokaDYOhCc0DsdrkArq8BHQj/ZFyCaOCaVo9XHscyKuixAfk

FgasiZJ8Jdtytm84UDw1SC5TPZpcyocKel685USz8hjrYn77SfKowVOYccYEWyu+IwpYclXujnTHuAk/QXqSxBX/i5YlWVqrfUcEZmWVs+t4qTA5JA

f8+Au0vii7gTHMnawyZH/nodDjGAVbiQsVoyCnooX7NZerjplEVFnwX+43evDoGwmP4EX+mN0dJP+sujr4UThlpz58ik+8OcmAhxFSkFFQf8Ahnyo8

nyAA0tz5h9Dt4AsxRxBJjc71BlBb6j/BJV+Q== root@master

只有本机的公钥信息

4、将公钥信息copy到对方的机器上：ssh-copy-id  -i  slave01

5、再去slave01的机器上查看authorized_keys: more /root/.ssh/authorized_keys

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAv8YXJU12Zag+R8+xSfrQu3TTa1Q+ZxZnwQW9P1tzi8p+U/Yi7lJ8Pt3bdTOfxN11TqXp7RAJxSVdRT

UR/F/1N3+oYKILjqnfNkwrFk/UWWlH0mH8/0iHD8c9azSkPVnudoWoHCzgOfaxbUbp/Qrr2q7EPm2g1pxsRHX3oWByNw6ZAwmBV3kVtk0xsIgAyzM2

sdNtDTGY1KqGJT1TmW+k/GpkRVo/nH4T7AZhhYtNq7u76TEQqnfcOZfyHJi6SCorLOykhwBJs85ewzqvFgC+Ww+prePoPbnnuXf8Xy2BMtudoV+wyR

lE2kqobeF2pnM8M017O1Z2w3pqrr7Rp4WwlQ== root@slave01

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA7f3Ari4WVjeNL07beCY2lsOScF7HjKFokaDYOhCc0DsdrkArq8BHQj/ZFyCaOCaVo9XHscyKuixAfk

FgasiZJ8Jdtytm84UDw1SC5TPZpcyocKel685USz8hjrYn77SfKowVOYccYEWyu+IwpYclXujnTHuAk/QXqSxBX/i5YlWVqrfUcEZmWVs+t4qTA5JA

f8+Au0vii7gTHMnawyZH/nodDjGAVbiQsVoyCnooX7NZerjplEVFnwX+43evDoGwmP4EX+mN0dJP+sujr4UThlpz58ik+8OcmAhxFSkFFQf8Ahnyo8
nyAA0tz5h9Dt4AsxRxBJjc71BlBb6j/BJV+Q== root@master

我们发现已经将 master的公钥信息copy过来了

这时我们再slave01上登录一下 master ：ssh  master  可以不用输入密码直接访问了

OK ,搞定！