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
[root@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:
6e:20:94:d5:e1:cc:42:9f:37:de:ce:bb:d9:e4:f6:6d root@redhat.com
在当前家目录会生成隐藏目录.ssh和dsa文件
[root@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
[root@redhat .ssh]# ssh-copy-id -i id_dsa.pub root@172.16.1.11
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
[root@redhat .ssh]# ssh root@172.16.1.11
Last login: Fri Jul 8 02:00:40 2016 from 172.16.1.1
[root@centos ~]#
