AWS更換服務器密鑰對

最近遇到開發離職，所以涉及到更改服務器密鑰。

1.在aws後臺生成並下載密鑰，而後將密鑰保存到本身電腦。

2.執行ssh-keygen -y，複製密鑰路徑，回車獲得public key,例如

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQClKsfkNkuSevGj3eYhCe53pcjqP3maAhDFcvBS7O6V
hz2ItxCih+PnDSUaw+WNQn/mZphTk/a/gU8jEzoOWbkM4yxyb/wB96xbiFveSFJuOp/d6RJhJOI0iBXr
lsLnBItntckiJ7FbtxJMXLvvwJryDUilBMTjYtwB+QhYXUMOzce5Pjz5/i8SeJtjnV3iAoG/cQk+0FzZ
qaeJAAHco+CY/5WrUBkrHmFJr6HcXkvJdWPkYQS3xqC0+FmUZofz221CBt5IMucxXPkX4rWi+z7wB3Rb
BQoQzd8v7yeb7OzlPnWOyN0qFU0XA246RA8QFYiCNYwI3f05p6KLxEXAMPLE my-key-pair

3.利用之前的密鑰登陸服務器，將上面第二步的public key粘貼到~/.ssh/authorized_keys
或者相應登陸用戶的.ssh目錄（個人是/home/ubuntu/.ssh/authorized_keys）
而後將舊的public key註釋或者刪除。

4.而後你就能夠利用新的密鑰文件(.pem後綴文件)登陸服務器了
例如：ssh -i "test.pem" ubuntu@192.168.1.1

1. Create a new key pair using AWS EC2 console or a third party tool.
2. Retrieve the public key from new key pair.
3. Connect to the instance using the existing private key.
4. Using text editor to open .ssh/authorized_keys, paste the public key of new key pair into the authorized_keys file.
5. (Optional) Delete the public key information of the original key pair in the authorized_keys file.