For mac os install ssh-copy-id:
brew install ssh-copy-id
For Linux install ssh-copy-id
yum install openssh*
STEP:
1: 生成SSH公钥
[iyunv@redhat ~]# ssh-keygen -t dsa Generating public/private dsa key pair. Enter file in which to save the key (/root/.ssh/id_dsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_dsa. Your public key has been saved in /root/.ssh/id_dsa.pub. The key fingerprint is:
在当前家目录会生成隐藏目录.ssh和dsa文件
[iyunv@redhat .ssh]# ls -la total 24 drwx------ 2 root root 4096 Jul 8 06:17 . drwxr-x--- 4 root root 4096 Jul 8 06:10 .. -rw------- 1 root root 622 Jul 8 06:10 authorized_keys -rw------- 1 root root 668 Jul 8 06:17 id_dsa -rw-r--r-- 1 root root 605 Jul 8 06:17 id_dsa.pub
2:copy 公钥到需要免密码登录的服务器
10 The authenticity of host '172.16.1.11 (172.16.1.11)' can't be established. RSA key fingerprint is 31:e6:9a:7a:02:a4:60:eb:b8:44:d0:30:80:1c:76:7d. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '172.16.1.11' (RSA) to the list of known hosts. root@172.16.1.11's password: Now try logging into the machine, with "ssh 'root@172.16.1.11'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
3: 实现免密码登录
Last login: Fri Jul 8 02:00:40 2016 from 172.16.1.1 [iyunv@centos ~]#
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