[CENTOS7 8] ssh登入時免輸入密碼 @新精讚

[CENTOS7 8] ssh登入時免輸入密碼

“ 自動程式需要進到別台機器時，沒辦法使用交談式方式輸入密碼，發現一個簡單的方法設定 ”

分享完整連結 //n.sfs.tw/m10549

分享連結 [CENTOS7 8] ssh登入時免輸入密碼@精讚

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2019-01-19 02:15:48 By 張○○

自動程式需要進到別台機器時，沒辦法使用交談式方式輸入密碼，所以要預先交換好金鑰，這是傳統的作法[1]：

1. 產生公私金錀
2. 把公錀加到目標機器中帳號中的目錄下的 ~/.ssh/authorized_keys 中

後來發現 [網管心得]ssh keygen用法@外行中的外行提供一個方法，超級好用的，192.168.1.1是目標ip：

$ ssh-copy-id username@192.168.1.1

/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
root@192.168.1.1's password: <==打入該主機的密碼

Number of key(s) added: 1

Now try logging into the machine, with: "ssh 'root@192.168.1.1'"
and check to make sure that only the key(s) you wanted were added.

錯誤排除

如果出現像這樣的錯誤：

/bin/ssh-copy-id: ERROR: failed to open ID file 'xxx/.pub': No such file or directory

/bin/ssh-copy-id: ERROR: failed to open ID file 'xxx/.ssh/id_rsa.pub': No such file or directory

/usr/bin/ssh-copy-id: ERROR: No identities found

那是因為沒有公私鑰對，請手動建立

# ssh-keygen -t rsa

詳細請參考相關連結

參考資料

[1] ssh keygen 免輸入密碼 https://blog.longwin.com.tw/2005/12/ssh_keygen_no_passwd/