Скачать или смотреть How to login to RHEL EC2 using Session Manager

This video shows the session manager setup for an RHEL EC2. To login to RHEL machine using session manager, you need to meet these 3 criteria.

1. The EC2 must be assigned an instance profile (role) which provides SSM access to the EC2. You can attach policy 'AmazonSSMManagedInstanceCore' to the role.

2. You should install SSM-agent in your machine.
dnf update -y
dnf install -y https://s3.amazonaws.com/ec2-download...

3. Ensure that your EC2's security group allows outbound https traffic. Usually this is allowed by default for any new sec grp.

You can ensure the first 2 conditions are met. Session Manager will work at this point. If it does not, then check condition number 3.

User Data:
Now, if you want to install ssm-agent when you launch the EC2, then include the below script in user data.

RHEL:
#!/bin/bash
dnf update -y
dnf install -y https://s3.amazonaws.com/ec2-download...

Ubuntu:
#!/bin/bash
apt update -y
snap switch --channel=candidate amazon-ssm-agent
systemctl start snap.amazon-ssm-agent.amazon-ssm-agent.service