How can I create a simple EC2 instance with SSM access in a private network?

0
0
Asked By TechieTurtle77 On

I'm really stuck here and have tried everything I can think of. I want to set up a basic EC2 instance in a private network that has SSM access, starting from scratch with a completely empty VPC. I've searched online and even asked ChatGPT, but I just can't get it to work! I've used Amazon Linux 2023 and Amazon Linux 2 AMIs, which should have SSM pre-installed. I also added user data to ensure it starts up correctly and created endpoints for SSM, SSMMessages, and EC2. I made sure to set up security groups allowing port 443 for outbound traffic, and I attached the SSM Role to my EC2's IAM role. Yet, I keep seeing the error: "SSM agent is not online. The SSM agent was unable to connect to a system manager endpoint to register itself with the service." I'm completely out of options after spending about six hours troubleshooting and retrying. Is there a straightforward CloudFormation template that I could use? I'd really appreciate any guidance on what I might be overlooking!

4 Answers

Answered By DebugDude On

Amazon Linux 2 should have the SSM agent running from the get-go, so you might not need the user data script at all. If there’s a typo or mistake in your user data, that could be causing issues with the startup of the SSM agent. Also, check your VPC settings—if your EC2 isn’t configured to reach the internet, you'll need to set up a NAT Gateway or use interface endpoints for SSM.

UserNotAnExpert -

I added a public IP and got access, but it’s not what I want. I’m lost on the VPC and routing stuff, and the documentation is overwhelming.

Answered By CloudGuru88 On

It sounds like a permissions issue! Make sure that your instance has been assigned an IAM instance profile that includes the necessary SSM permissions. Check out the AmazonSSMManagedInstanceCore policy as it’s crucial for SSM access.

LostInTheClouds -

I actually did set that up, I swear! It’s just so frustrating.

Answered By NATMaster On

Your instance needs outbound internet access for SSM. If it's just one instance, assign a public IP and simplify your security group. For multiple instances, consider alternatives like a NAT Gateway or interface endpoints to reach AWS services securely.

UserNotAnExpert -

Exactly! Outbound access seems to be the key issue.

Answered By CloudyNavigator On

Ensure your instance has the correct IAM permissions and that it can reach SSM endpoints through either an Internet NAT gateway or VPC endpoints. Also, double-check that the AMI you’re using has the SSM agent built-in.

Related Questions

LEAVE A REPLY

Please enter your comment!
Please enter your name here

This site uses Akismet to reduce spam. Learn how your comment data is processed.