User Data script not downloading files from S3 bucket? - amazon-web-services

Question

i have s3cmd and EC2 api pre configured AMI. While creating new instance with user data for downloading files from S3 bucket, i face some following problems.
in user data i have code for
- creating new directory on new instance.
- downloading file from AWS S3 bucket.
Script is
#! /bin/bash
cd /home
mkdir pravin
s3cmd get s3://bucket/usr.sh >> temp.log
But in above script , mkdir pravin creates new directory with name pravin but s3cmd get s3://bucket/usr.sh not downloads file from AWS S3 bucket.
it also creates temp.log but it is empty.
So how i can solve this problem ?

Answer 1

An alternative solution would be to use an instance that has an IAM role assigned to it and the aws-cli, which would require that you have Python installed. All of this could be accomplished by inserting the following in the user-data field for your instance:
#!/bin/bash
apt-get update
apt-get -y install python-pip
apt-get -y install awscli
mkdir pravin
aws s3 cp s3://bucket/usr.sh temp.log --region {YOUR_BUCKET_REGION}
NOTE: The above is applicable for Ubuntu only.
And then for your instances IAM role you would attach a policy like so:
{
"Version":"2012-10-17",
"Statement":[{
"Effect":"Allow",
"Action":"s3:*",
"Resource":"arn:aws:s3:::YourBucketName/*"
}
]
}

Answer 2

I suspect that the user running the user data script lacks a .s3cfg file. You may need to find a way to indicate the location of the file when running this script.