ssh 免登录

场景：

jenkins 需要自动登陆到远程服务器

1. 生成 ssh 公钥和私钥（在 jenkins 服务器上执行）

xiluhua@vm-xiluhua ~ $ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/xiluhua/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/xiluhua/.ssh/id_rsa.
Your public key has been saved in /home/xiluhua/.ssh/id_rsa.pub.
The key fingerprint is:
4f:59:70:07:ac:5d:78:ed:b2:98:de:8d:9f:eb:73:36 xiluhua@vm-xiluhua
The key's randomart image is:
+--[ RSA 2048]----+
| ..oo.. |
| oo.o .|
| o.o . |
| .o. . .|
| S o o o |
| o o . |
| .. . o |
| . oE=|
| .**|
+-----------------+

2. 查看生成结果

xiluhua@vm-xiluhua ~ $ cd /home/xiluhua/.ssh/
xiluhua@vm-xiluhua ~/.ssh $ ll
总用量 12
-rw-------. 1 xiluhua xiluhua 1675 2017/07/26 12:57:57 id_rsa
-rw-r--r--. 1 xiluhua xiluhua 400 2017/07/26 12:57:57 id_rsa.pub
-rw-r--r--. 1 xiluhua xiluhua 971 2017/01/30 21:09:14 known_hosts

3. 将公钥部署到目标客户端（一）

xiluhua@vm-xiluhua ~/.ssh $ ssh-copy-id -i id_rsa.pub loginuser@10.1.118.45
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
xiluhua@192.168.178.132's password: 

Number of key(s) added: 1

Now try logging into the machine, with: "ssh 'loginuser@10.1.118.45'"
and check to make sure that only the key(s) you wanted were added.

3. 将公钥部署到目标客户端（二）

scp -p ~/.ssh/id_rsa.pub loginuser@10.1.118.45:/home/weblogic/.ssh/authorized_keys

实在不行，手动复制到目标机器上也可以

4. 验证

xiluhua@vm-xiluhua ~/.ssh $ ssh loginuser@10.1.118.45
Last login: Tue Jul 25 21:27:55 2017 from 192.168.178.1
******************************
*** welcome! xiluhua ***
******************************
xiluhua@localhost ~ $

return "SUCCESS";