linux免密码登陆

1. 生成密钥

 ➜  .ssh ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (~/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in ~/.ssh/id_rsa.
Your public key has been saved in ~/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:ExgdQNetjvhIt7B9BXQ3tCOTSpq5HP+s3UZlQS42bKg xxxx@xxxdeMacBook-Pro.local
The key's randomart image is:
+---[RSA 2048]----+
|     .+ooo . .o. |
|       +. o =.+o |
|      . ...++Boo.|
|         *+.ooo.o|
|       .SE..   o |
|      +.o=. . .  |
|     . Bo... .   |
|      o + .+ ..  |
|         ...+..  |
+----[SHA256]-----+

2. 公钥上传到服务器

scp -P 22000 ~/.ssh/id_rsa.pub username@192.168.0.141:~/.ssh/temp001

登录服务器，公钥保存为authorized_keys

cat ~/.ssh/temp001 >> ~/.ssh/authorized_keys
rm ~/.ssh/temp001

3. 配置本地ssh config文件

➜  .ssh touch config

config文件内容如下

Host hdhost
  HostName 192.168.0.141
  Port 22000
  User root
  IdentityFile ~/.ssh/id_rsa

4. 免密码登录

➜  .ssh ssh hdhost
Last login: Sun Jun  3 22:34:40 2018 from 192.168.0.141
Welcome to Alibaba Cloud Elastic Compute Service !
[root@izuf61kij6ti02tzbzl3pqz ~]#