建新用户

adduser hadoop

用户创建后切换用户su hadoop

生成密钥

切换后执行ssh-keygen -t rsa生成密钥

[hadoop@localhost ~]$ ssh-keygen -t rsaGenerating public/private rsa key pair.Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/hadoop/.ssh/id_rsa.Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.The key fingerprint is:79:0a:3d:04:3d:83:d5:24:a8:94:62:89:f3:b7:90:f8 hadoop@172.31.10.94The key's randomart image is:+--[ RSA 2048]----+| . . ..=oo.      ||o + o o.+..      || = + .  .o       ||. + o  o .       || . o .. S .      ||  E .  . +       ||        .        ||                 ||                 |+-----------------+

然后把id_rsa.pub的改名成authorized_keys. id_rsa.pub里的内容最后会有 hadoop@localhost,转成authorized_keys的时候如果不能登录,就把最后这节删掉.

当有多个公钥时,在authorized_keys里追加写就行了.另外要保证authorized_keys的权限是600,.ssh的权限是700

chmod 600 authorized_keyschmod 700 .ssh

也可以用xshell生成密钥,然后将公钥上传到服务器,写入authorized_keys里.

ssh命令登录远程机

ssh -i ~/.ssh/<private_key_file> <username>@ip