AWS CLI Tips & Tricks

Connect with EC2 Instance

Ip address is public IP of EC2 Instance

• chmod 0400 Hassium.pem

• ssh -i Hassium.pem ec2-user@52.59.11.125

ssh -i Hassium.pem ec2-user@3.120.129.217

Configure AWS

 aws configure --profile <profile -name>

• Access key ID : AKIAIOSFODNN7EXAMPLE
• Secret access key: wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
• Region: eu-central-1
• out format: text

Dry Run( --dry-run)

run command without changing any AWS resource to check permission to access resource

• supported by set of CLI commands

   aws ec2 run-instances help
  
   aws ec2 run-instances --dry-run
  

STS Decode Error Messages

decode error messages from AWS on CLI

• STS DecodeMessage permission must be given to EC2 IAM Policy before requesting decode

   aws sts decode-authorization-message   --encoded-message <message to decode>
  

MFA with CLI

Fetch & Store temporary credentials from STS into a config profile to access AWS resources

aws sts get-session-token -- serial-number <ARN of registered MFA Device> -- token-code <Code on the device> 

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CLI Cheat Sheet

CMD	Usage
aws configure	setup account with access key
aws configure --profile profile -name	setup account & store config as a profile
aws iam list-users	list users
aws sts decode-authorization-message --encoded-message message to decode	Decode error blob on CLI
aws command --dry-run	to check permission to run a command
aws sts get-session-token -- serial-number ARN of registered MFA Device -- token-code Code on the device	Get Temporary Access Token