In this article, we'll see two codes of creating an EC2 instance. Though they are not much different, the latter one shows how we can use role and how to add a public key. How do I change the SSH Key on a running EC2 instance? Background Information. Generate a new Key Pair. When you do this, copy the SSH key information to your text editor; you will need this to update the old key in the Dashboard and the Authorized Keys file on the instance(s). Find the old key under Clouds AWS (US/EU) SSH Keys. Create a new key pair and save the private key file. You can create a key pair using the console, AWS Command Line Interface (AWS CLI), or AWS Tools for Windows PowerShell. For more information, see Creating a Key Pair Using Amazon EC2. Note: To give the new key pair the same name as the lost key pair, you must first delete the lost key pair. Mar 22, 2016 This would create a machine named “aws-test”, with an instance type of t2.micro in the us-west-2 region, based on a daily Ubuntu 15.10 AMI, and using the SSH key found in the file /.ssh/sshkey. Once this instance is up and running, Docker Machine would provision and configure Docker Engine on the instance. This will create an SSH key pair that lives in the Terraform state (it is not written to disk in files other than what might be done for the Terraform state itself when not using remote state), creates an AWS key pair based on the public key and then creates an Ubuntu 14.04 instance where the ubuntu user is accessible with the private key that. What I'm wondering is how to manage the SSH keys. I imagine we will have one per client, so every time we setup a new client we will generate a new key. I don't know how these should be stored or managed. On top of that, were going to have more then one team member trying to connect, so for every person trying to connect do we generate a new key?
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I want to add new user accounts that can connect to my Amazon Elastic Compute Cloud (Amazon EC2) Linux instance using SSH. How do I do that?
Every Amazon EC2 Linux instance launches with a default system user account with administrative access to the instance. If multiple users require access to the instance, it's a security best practice to use separate accounts for each user.
You can expedite these steps by using cloud-init and user data. For more information, see How can I give a user permissions to connect to my EC2 Linux instance using SSH?
Create a key pair for the new user account
- Create a key pair, or use an existing one, for the new user.
- If you create your own key pair using the command line, follow the recommendations at create-key-pair or New-EC2KeyPair Cmdlet for key type and bit length.
- If you create your own key pair using a third-party tool, be sure that your key matches the guidelines at Importing Your Own Public Key to Amazon EC2.
Add a new user to the EC2 Linux instance
1. Connect to your Linux instance using SSH.
2. Use the adduser command to add a new user account to an EC2 instance (replace new_user with the new account name). The following example creates an associated group, home directory, and an entry in the /etc/passwd file of the instance:
Note: If you add the new_user to an Ubuntu instance, include the --disabled-password option to avoid adding a password to the new account:
3. Change the security context to the new_user account so that folders and files you create have the correct permissions:
Note: When you run the sudo su - new_user command, the name at the top of the command shell prompt changes to reflect the new user account context of your shell session.
4. Create a .ssh directory in the new_user home directory:
5. Use the chmod command to change the .ssh directory's permissions to 700. Changing the permissions restricts access so that only the new_user can read, write, or open the .ssh directory.
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6. Use the touch command to create the authorized_keys file in the .ssh directory:
7. Use the chmod command to change the .ssh/authorized_keys file permissions to 600. Changing the file permissions restricts read or write access to the new_user.
Retrieve the public key for your key pair
Retrieve the public key for your key pair using the method that applies to your configuration:
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Verify your key pair's fingerprint
After you import your own public key or retrieve the public key for your key pair, follow the steps at Verifying Your Key Pair's Fingerprint.
Update and verify the new user account credentials
After you retrieve the public key, use the command shell session that is running under the context of the new user account to confirm that you have permission to add the public key to the .ssh/authorized_keys file for this account:
1. Run the Linux cat command in append mode:
2. Paste the public key into the .ssh/authorized_keys file and then press Enter.
Note: For most Linux command line interfaces, the Ctrl+Shift+V key combination pastes the contents of the clipboard into the command line window. For the PuTTY command line interface, right-click to paste the contents of the clipboard into the PuTTY command line window.
3. Press and hold Ctrl+d to exit cat and return to the command line session prompt.
(Optional) Allow the new user to use sudo
Note: If you don't want to allow the new user to use sudo, proceed to Verify that the new user can use SSH to connect to the EC2 instance.
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1. Use the passwd command to create a password for the new user:
Note: You're prompted to reenter the password. Enter the password a second time to confirm it.
2. Add the new user to the correct group.
For Amazon Linux, Amazon Linux 2, RHEL, and CentOS:
Use the usermod command to add the user to the wheel group.
Use the usermod command to add the user to the sudo group.
Verify that the new user can use SSH to connect to the EC2 instance
1. Verify that you can connect to your EC2 instance when using ssh as the new_user by running the following command from a command line prompt on your local computer:
To connect to your EC2 Linux instance using SSH from Windows, follow the steps at Connecting to Your Linux Instance from Windows Using PuTTY.
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2. After you connect to your instance as the new_user by using SSH, run the id command from the EC2 instance command line to view the user and group information created for the new_user account:
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The id command returns information similar to the following:
3. Distribute the private key file to your new user.
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