Linux無密碼登入

[Benjamin]

Password-less login

1. Switch to hadoop user

   su - hadoop
   cd
   pwd

2. Configuring SSH password-less login

   ssh-keygen -t rsa
   Enter file in which to save the key: [Return]
   Enter passphrase (empty for no passphrase): [Return]
   Enter same passphrase again: [Return]
   ls -l .ssh

   (copy public key to authorized_keys file)

   ssh-copy-id hadoop@localhost (把公鑰放到我本機我的帳號裡面，目的是讓自己hadoop可以在本機localhost無密碼登入)

   ssh-copy-id本身有資安風險，除非是在自己封閉網路的私有雲，或是全部自己管的叢集，否則不要貿然使用。
   

   

   測試：
   

   

3. Test password-less login

   ssh hadoop@localhost
   exit # logout system

4. Copy public key to other servers

   ssh-copy-id [email protected]
   ssh-copy-id [email protected]
   ssh-copy-id [email protected]
   ssh-copy-id [email protected]

5. Test password-less login to other servers

   ssh [email protected]
   exit # logout system

   ssh [email protected]
   exit # logout system

   ssh [email protected]
   exit # logout system

   ssh [email protected]
   exit # logout system

6. Check authorized_keys file

   cd
   cat .ssh/authorized_keys

   

參考資料：How Passwordless SSH Login Works. Security is my passion | by Michael Krasnov | Better Programming