start a stopped AWS EC2 instances

ssh-gsoc.sh

#!/bin/bash

# GSOC instance.
aws_instance_id=i-01234567d  # dummy id.

# Start a stopped aws ec2 instance.
alias start_aws_instance="aws ec2 start-instances --instance-ids $gsoc_id"

# Stop a running aws ec2 instance.
alias stpo_aws_instance="aws ec2 stop-instances --instance-ids $gsoc_id"

# SSH into that instance.
ssh_gsoc() {
  # Get the public IP address of the instance.
  # This is needed as a restart of the instance changes the IP address.
  gsoc_ip=`aws ec2 describe-instances --instance-ids $gsoc_id  --query "Reservations[*].Instances[*].PublicIpAddress" --output text`
  
  # SSh into the instance using the public IP address.
  ssh ubuntu@${gsoc_ip} -L 7111:localhost:7111 -i path/to/instance-name.pem
}