Centos7下实现免密码登录

Centos7下实现免密码登录

linux  /  管理员 发布于 2020-05-25 18:19:54   337

Centos7下实现免密码登录

生成密钥

ssh-keygen

authorized_keys:存放远程免密登录的公钥,主要通过这个文件记录多台机器的公钥 

id_rsa : 生成的私钥文件 

id_rsa.pub ： 生成的公钥文件 

know_hosts : 已知的主机公钥清单 

如果希望ssh公钥生效需满足至少下面两个条件： 

1) .ssh目录的权限必须是700 

2) .ssh/authorized_keys文件权限必须是600

二、远程免密登录 

1.原理： 

- 客户端向服务器端发出连接请求 

- 服务器端向客户端发出自己的公钥 

- 客户端使用服务器端的公钥加密通讯密钥然后发给服务器端 

- 如果通讯过程被截获，由于窃听者即使获知公钥和经过公钥加密的内容，但不拥有私 钥依然无法解密（RSA算法） 

- 服务器端接收到密文后，用私钥解密，获知通讯密钥 

2.常用以下几种方法： 

2.1通过ssh-copy-id的方式

[root@localhost ~]# ssh-copy-id -i root@worker1

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"

/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: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@worker1's password:

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh 'root@worker1'"

and check to make sure that only the key(s) you wanted were added.