openstack创建实例无密码登录详解

[root@openstack ~]# 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:
86:ce:45:80:43:27:97:8c:4d:2d:1b:7b:4c:54:0c:a2 root@openstack
The key's randomart image is:
+--[ RSA 2048]----+
|   .o**+o+.      |
|    +=*oo .      |
|    E. B.        |
|      ooo        |
|      ..S        |
|     o o         |
|      o          |
|                 |
|                 |
+-----------------+
[root@openstack ~]# nova keypair-list
+------+-------------+
| Name | Fingerprint |
+------+-------------+
+------+-------------+
[root@openstack ~]# cd .ssh/
[root@openstack .ssh]# ll
total 12
-rw------- 1 root root 1675 Feb 28 11:06 id_rsa
-rw-r--r-- 1 root root  396 Feb 28 11:06 id_rsa.pub
-rw-r--r-- 1 root root  393 Feb 27 09:34 known_hosts
[root@openstack .ssh]# nova keypair-add --pub_key id_rsa.pub mykey
[root@openstack .ssh]# nova keypair-list
+-------+-------------------------------------------------+
| Name  | Fingerprint                                     |
+-------+-------------------------------------------------+
| mykey | 86:ce:45:80:43:27:97:8c:4d:2d:1b:7b:4c:54:0c:a2 |
+-------+-------------------------------------------------+
[root@openstack .ssh]# nova boot --flavor 2  --key_name mykey ^Cimage centos6.4-x86_64 centos4
创建完成后即可登录
[root@openstack .ssh]# ssh root@10.1.1.8
The authenticity of host '10.1.1.8 (10.1.1.8)' can't be established.
RSA key fingerprint is 42:e2:8e:55:2a:b7:8f:8f:39:60:db:31:b3:c7:80:cc.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.1.1.8' (RSA) to the list of known hosts.
Please login as the user "cloud-user" rather than the user "root".
[root@openstack .ssh]# ssh cloud-user@10.1.1.8
[cloud-user@centos4 ~]$