Different Ways to change .Pem file of AWS instance Part : - 1 (Using Session manager)

Key

  • Pem file is a private key file that you download when you first time generate key from key pair section or when you create an instance. It is use to securely connect your instance using terminal. So AWS stores public key and they let us download .Pem one time only.

  • In that case, Someone may loose .Pem file by mistake and you are not able to ssh in your instance without .Pem file. So the question is  How to change your .Pem file of your instance in this scenario. 

  • There are  3 ways that i know, how to change .Pem file. 
    1. Using Session Manager
    2. Using AWS-Support Reset Access automation document in System Manager
    3. Using new instance
  • I will guide you through the step wise. In this blog i will explain how to change .Pem file using Session Manager. This use full when your instance is running or it is instance store backed, so in that case this is very useful method. If you haven't attach the System Manager role to AWS instance then this can be done using how to connect AWS instance when you lost .Pem file. 

  • After completing above step open terminal through session manager and follow below steps.


Step : - 1   Change user to root and then change it to Ubuntu user. Now create new instance or If you have instance with different key and you want to use that key then no need to create new one.

 
Step : - 2   You need to ssh into different instance / new instance which .Pem file is available in you System. Go to .ssh directory and copy the content of authorized_key file (command : cat  ~/.ssh/authorized_key ) means public key of related to .Pem file name.


Step : - 3   After paste this public key to your old instance's (instance with lost .Pem file ) authorized_keys file ( access using session manager ) , save and close authorized_keys file .


Step : - 4   Now you can ssh into instance with different .Pem file. This is easiest way to change .Pem without losing any kind of data. You can do it even with your running instance.

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Different Ways to change .Pem file of AWS instance Part : - 2 ( Using Reset-Access Document )

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In part one we have seen how to change .Pem file using session manager, Now in this part we are going to use Automation document to change the key-pair and get access to your AWS instance. This will replace the old key with new key-pair and you can connect to your instance. This is automation technique. So we don't need to do much things, all the things is done by AWS by automation document called Reset-Access . This is useful when your instance is ebs backed . This automation technique is also in the System Manager so you need to attach role to instance, So we can run Automation document on the instance whose key-pair is lost. If you haven't attach the System Manager role to AWS instance then this can be done using   how to connect AWS instance when you lost .Pem file. After attaching the IAM role to instance follow below steps and regain key-pair.Now follow below step to reset .Pem file. Step : - 1    Open System Manager and select the Automation under the Actio...
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