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ssh免密碼登錄快速配置方法

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環境需求:

兩臺Linux主機 A (192.168.3.101)和 B(192.168.3.102),如何使用主機 A 免密碼登錄 主機B ?

配置步驟:

首頁登錄主機 A ,在主機A上生成自己的ssh-keygen

ssh-agent bash
ssh-keygen -t rsa
ssh-add ~/.ssh/id_rsa
ls -la /root

生成 .ssh 文件目錄

authorized_keys:存放遠程免密登錄的公鑰,主要通過這個文件記錄多臺機器的公鑰
id_rsa : 生成的私鑰文件
id_rsa.pub : 生成的公鑰文件
know_hosts : 已知的主機公鑰清單

如果希望ssh公鑰生效需滿足至少下面兩個條件:
 1) .ssh目錄的權限必須是700  2) .ssh/authorized_keys文件權限必須是600

拷貝主機A的公鑰到主機B(拷貝需要輸入主機B的密碼)

ssh-copy-id -i /root/.ssh/id_rsa.pub [email protected]

出現下面內容,說明添加成功
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
[email protected]‘s password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh ‘[email protected]‘"
and check to make sure that only the key(s) you wanted were added.

嘗試密碼登錄

ssh [email protected]

如無意外,無需密碼可以直接登錄主機B中。

ssh免密碼登錄快速配置方法