sshd_key認證

# info
# CentOS 7.3 64位

• 生成認證key

  ssh-keygen

  Generating public/private rsa key pair.
  # 指定保存加密字符的文件（使用默認）
  Enter file in which to save the key 
  Created directory '/home/USERNAME/.ssh'.
  # 設定密碼（使用默認空密碼）
  Enter passphrase (empty for no passphrase):
  # 確認密碼
  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私鑰（鑰匙）
  /home/USERNAME/.ssh/id_rsa.pub公鑰（鎖）

• 加密服務器

  ssh-copy-id -i /home/USERNAME/.ssh/id_rsa.pub USERNAME@---.---.---.---

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

  authorized_keys存在於/home/USERNAME/.ssh/表明加密完成

• 分發密鑰

  scp USERNAME@---.---.---.---:/home/USERNAME/.ssh/id_rsa ~/.ssh/