AWS CLI User Data Script not running

Question

I'm trying to pass user data to my EC2 instance at the time of creation using AWS CLI run-instances command.

I placed the below command in a file:

#!/bin/bash
sudo su
yum update -y
yum install httpd -y
systemctl start httpd
systemctl enable httpd
echo "<html><h1>Welcome to the server</h1><html>" >> /var/www/html/index.html

All the AWS CLI command I ran(with .txt and without):

aws ec2 run-instances --image-id ami-062f7200baf2fa504 --count 1 --instance-type t2.micro --key-name lab115key --security-groups my-sg --region us-east-1 --user-data file://./text1.txt
aws ec2 run-instances --image-id ami-062f7200baf2fa504 --count 1 --instance-type t2.micro --key-name lab115key --security-groups my-sg --region us-east-1 --user-data file://./text1
aws ec2 run-instances --image-id ami-062f7200baf2fa504 --count 1 --instance-type t2.micro --key-name lab115key --security-groups my-sg --region us-east-1 --user-data text1.txt
aws ec2 run-instances --image-id ami-062f7200baf2fa504 --count 1 --instance-type t2.micro --key-name lab115key --security-groups my-sg --region us-east-1 --user-data text1

Then I tried to encode the script to Base64 still the User data is not accepted.

I created a Security group with port 80 and 22 with source 0.0.0.0/0 using Default VPC and Subnet.

AMI: Amazon Linux 2 - t2.micro

Region: us-east-1

ISSUE:

HTTPD is not getting installed.
index.html is not getting created in the path.

Am I doing something wrong? Why is it not working?

Any other way to solve this issue?

New Updates on this issue:

The User data that I passed to the run-instances command is getting installed but its taking too much of time.

Not all the time its getting installed. I ran the code five times, only 3 EC2 got User data installed.

From AWS Status Webpage: I found that us-east-1 Is having lots of latency issues.

Is the instance in a public subnet so that it can download files from the Internet? Have you looked in /var/log/cloud-init-output.log to confirm that the script is being executed and to check for errors? — John Rotenstein
– John Rotenstein, Commented Feb 13, 2020 at 10:33
I agree with @JohnRotenstein, check the log files. I was unable to recreate the issue you were having. Are you sure the default subnet it's being installed in has a route outside your VPC? Can you run these commands manually? — kenlukas
– kenlukas, Commented Feb 13, 2020 at 15:43
@JohnRotenstein Yes, the instance is placed in a public subnet. — Nikhil K Murali
– Nikhil K Murali, Commented Feb 14, 2020 at 3:50
@kenlukas, Im able to SSH into that instance and run each command manually. — Nikhil K Murali
– Nikhil K Murali, Commented Feb 14, 2020 at 3:51

John Rotenstein · Accepted Answer · 2020-02-14 04:41:24Z

2

Commands provided via User Data are executed as the foot user.

Therefore, do not use sudo commands within User Data scripts.

Any errors from executing a User Data script on Amazon Linux can be found in:

/var/log/cloud-init-output.log

If you are not sure whether the script is being executed, add a line like this after the header line:

echo Script started > /tmp/script.log

You can then check the contents of /tmp/script.log to determine whether the script was executed.

answered Feb 14, 2020 at 4:41

John Rotenstein

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1 Comment

Nikhil K Murali Over a year ago

I was able to run my script through AWS CLI with sudo but its taking too much of time to run the command. At first I thought the code is not getting executed but it takes time. Now its working properly.

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