linux 下两台电脑之间ssh无密码连接

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例子：在192.168.0.12使用tecmint用户，连接192.168.0.11主机上的sheena用户

Step 1: Create Authentication SSH-Kegen Keys on – (192.168.0.12)

First login into server 192.168.0.12 with user tecmint and generate a pair of public keys using following command.

[tecmint@tecmint.com ~]$ ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/home/tecmint/.ssh/id_rsa): [Press enter key]Created directory '/home/tecmint/.ssh'.Enter passphrase (empty for no passphrase): [Press enter key]Enter same passphrase again: [Press enter key]Your identification has been saved in /home/tecmint/.ssh/id_rsa.Your public key has been saved in /home/tecmint/.ssh/id_rsa.pub.The key fingerprint is:5f:ad:40:00:8a:d1:9b:99:b3:b0:f8:08:99:c3:ed:d3 tecmint@tecmint.comThe key's randomart image is:+--[ RSA 2048]----+|        ..oooE.++||         o. o.o  ||          ..   . ||         o  . . o||        S .  . + ||       . .    . o||      . o o    ..||       + +       ||        +.       |+-----------------+

Step 2: Create .ssh Directory on – 192.168.0.11

Use SSH from server 192.168.0.12 to connect server 192.168.0.11 using sheena as user and create .sshdirectory under it, using following command.

[tecmint@tecmint ~]$ ssh sheena@192.168.0.11 mkdir -p .sshThe authenticity of host '192.168.0.11 (192.168.0.11)' can't be established.RSA key fingerprint is 45:0e:28:11:d6:81:62:16:04:3f:db:38:02:la:22:4e.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.0.11' (ECDSA) to the list of known hosts.sheena@192.168.0.11's password: [Enter Your Password Here]

Step 3: Upload Generated Public Keys to – 192.168.0.11

Use SSH from server 192.168.0.12 and upload new generated public key (id_rsa.pub) on server 192.168.0.11under sheena‘s .ssh directory as a file name authorized_keys.

[tecmint@tecmint ~]$ cat .ssh/id_rsa.pub | ssh sheena@192.168.0.11 'cat >> .ssh/authorized_keys'sheena@192.168.1.2's password: [Enter Your Password Here]

Step 4: Set Permissions on – 192.168.0.11

Due to different SSH versions on servers, we need to set permissions on .ssh directory and authorized_keys file.

[tecmint@tecmint ~]$ ssh sheena@192.168.0.11 "chmod 700 .ssh; chmod 640 .ssh/authorized_keys"sheena@192.168.0.11's password: [Enter Your Password Here]

Step 5: Login from 192.168.0.12 to 192.168.0.11 Server without Password

From now onwards you can log into 192.168.0.11 as sheena user from server 192.168.0.12 as tecmint user without password.

[tecmint@tecmint ~]$ ssh sheena@192.168.0.11

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