ec2密钥对丢失，按照官方办法无法解决

https://aws.amazon.com/cn/premiumsupport/knowledge-center/user-data-replace-key-pair-ec2/

Content-Type: multipart/mixed; boundary="//"
MIME-Version: 1.0

--//
Content-Type: text/cloud-config; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="cloud-config.txt"

#cloud-config
cloud_final_modules:
- [users-groups, always]
users:
  - name: ubuntu
    ssh-authorized-keys: 
    - ssh-rsa AAAAB3NzaC1yc2EAAAADxxxxx