应用场景：test01 ssh访问test02，不需要输入密码
登录test01
第一步：生成公钥、私钥
[root@test01 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
b8:cf:14:8f:ae:69:2a:fb:ba:1a:60:d8:8a:f8:4c:1a root@test01
[root@test01 ~]#
第二步：复制公钥到被管理的服务器test02
[root@test01 ~]# ssh-copy-id -i ~/.ssh/id_rsa.pub “root@192.168.1.19”
21
The authenticity of host ‘192.168.1.19 (192.168.1.19)’ can’t be established.
RSA key fingerprint is a7:47:b2:f6:e7:ef:8f:2c:9d:9c:03:74:de:3b:e1:55.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘192.168.1.19’ (RSA) to the list of known hosts.
root@192.168.1.19’s password:
Now try logging into the machine, with “ssh ‘root@192.168.1.19′”, and check in:
.ssh/authorized_keys
to make sure we haven’t added extra keys that you weren’t expecting.
[root@test01 ~]#
最后就可以直接 ssh root@192.168.1.19 登录test02，而不用再输入密码