3步简单实现SSH无密码登录

下面简单的做下实验：

一：准备2台服务器：

  192.168.10.101

2  192.168.10.102

二：关键字解释

ssh-keygen ：  产生公钥与私钥对

ssh-copy-id ：将本机的公钥复制到远程机器的authorized_keys文件中

三：开始实验

第一步: 在192.168.10.101上使用ssh-keygen产生公钥私钥对

 [root@controlm ~]# ssh-keygen
 Generating public/private rsa key pair.
 Enter file in which to save the key (/root/.ssh/id_rsa):
 Enter passphrase (empty for no passphrase):
 Enter same passphrase again:
 Your identification has been saved in /root/.ssh/id_rsa.
 Your public key has been saved in /root/.ssh/id_rsa.pub.
 The key fingerprint is:
 a4:ae:::cc:::2f::3f:a5:e5:::d2:6c root@controlm
 The key's randomart image is:
 +--[ RSA ]----+
 |     o           |
 |    . E          |
 |     +  .        |
 |    +  o         |
 |   . =. S        |
 |    B.o o        |
 |   + *.*         |
 |  ..=.+ .        |
 |  .+.  .         |
 +-----------------+

第二步：用ssh-copy-id将公钥复制到远程机器1922.168.10.102中（注意:：ssh-copy-id 是将key写到远程机器的 ~/ .ssh/authorized_key.文件中）

 [root@controlm ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub 192.168.10.102
 /usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
 /usr/bin/ssh-copy-id: INFO:  key(s) remain to be installed -- if you are prompted now it is to install the new keys
 root@192.168.10.102's password:   这里输入你的登录密码

 Number of key(s) added: 

 Now try logging into the machine, with:   "ssh '192.168.10.102'"
 and check to make sure that only the key(s) you wanted were added.

第三部： 登录到远程机器192.168.10.102不用输入密码

 [root@controlm ~]# ssh 192.168.10.102
 Last login: Wed Feb  ::  from 192.168.10.101
 [root@docker ~]#