sshd_key认证

# info
# CentOS 7.3 64位

• 生成认证key

  ssh-keygen
  

  Generating public/private rsa key pair.
  # 指定保存加密字符的文件（使用默认）
  Enter file in which to save the key 
  Created directory '/home/USERNAME/.ssh'.
  # 设定密码（使用默认空密码）
  Enter passphrase (empty for no passphrase):
  # 确认密码
  Enter same passphrase again:
  Your identification has been saved in /home/USERNAME/.ssh/id_rsa.
  Your public key has been saved in /home/USERNAME/.ssh/id_rsa.pub.
  The key fingerprint is:
  ※※※
  

  /home/USERNAME/.ssh/id_rsa私钥（钥匙）
  /home/USERNAME/.ssh/id_rsa.pub公钥（锁）
• 加密服务器

  ssh-copy-id -i /home/USERNAME/.ssh/id_rsa.pub [email protected]
  

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

  authorized_keys存在于/home/USERNAME/.ssh/代表加密完成
• 分发密钥

  scp [email protected]:/home/USERNAME/.ssh/id_rsa ~/.ssh/