Manage AWS instance from command line

manage-instance.sh

#!/bin/bash

AWS_PROFILE=<ENTER AWS PROFILE NAME HERE>
AWS_REGION=<ENTER INSTANCE REGION>
AWS_INSTANCE_ID=<ENTER INSTANCE ID HERE>

red=`tput setaf 1`
green=`tput setaf 2`
reset=`tput sgr0`

command -v aws > /dev/null


if [[ $? != 0 ]]; then 
    echo "${red}Please install awscli and try again${reset}"
    exit 1;
fi

set -e

get_status () {
    status=`aws ec2 --profile $AWS_PROFILE --region $AWS_REGION describe-instances --instance-ids $AWS_INSTANCE_ID`;
    status_name=`python -c "import json; print json.loads(\"\"\"$status\"\"\")['Reservations'][0]['Instances'][0]['State']['Name']"`
    echo $status_name
}
status () {
    status_name=`get_status`

    if [ "$status_name" = "stopped" ]; then
	echo "${red}Server status: stopped.${reset}"
    elif [ "$status_name" = "stopping" ]; then
	echo "${red}Server status: stopping...${reset}"
    elif [ "$status_name" = "running" ]; then
	echo "${green}Server status: running.${reset}"
    else
	echo "Server status: $status_name."
    fi
}

wait_stopping () {
    status_name=`get_status`;
    if [ "$status_name" = "stopping" ]; then
        printf "."
        wait_stopping inner
	if [ "$1" != "inner" ]; then printf "\n"; fi
    fi
}

start () {
    try_again="_try_again_"
    
    wait_stopping;
    status=`aws ec2 --profile $AWS_PROFILE --region $AWS_REGION start-instances --instance-ids $AWS_INSTANCE_ID`;
    current_state=`python -c "import json; print json.loads(\"\"\"$status\"\"\")['StartingInstances'][0]['CurrentState']['Name']"`
    previous_state=`python -c "import json; print json.loads(\"\"\"$status\"\"\")['StartingInstances'][0]['PreviousState']['Name']"`
    if [ "$previous_state" = "running" ] && [ "$current_state" = "running" ]; then
	if [ "$1" = $try_again ]; then printf "\n"; fi
	echo "${green}Server already started.${reset}"
    elif [ "$previous_state" = "stopped" ] && [ "$current_state" = "pending" ]; then
	echo "${green}Server is starting...${reset}"
    elif [ "$previous_state" = "pending" ] && [ "$current_state" = "pending" ]; then
	printf "."
	start $try_again;
    else
	echo "Previous state: $previous_state, current state: $current_state" 
    fi
}

stop () {
    status=`aws ec2 --profile $AWS_PROFILE --region $AWS_REGION stop-instances --instance-ids $AWS_INSTANCE_ID`;
    current_state=`python -c "import json; print json.loads(\"\"\"$status\"\"\")['StoppingInstances'][0]['CurrentState']['Name']"`
    previous_state=`python -c "import json; print json.loads(\"\"\"$status\"\"\")['StoppingInstances'][0]['PreviousState']['Name']"`
    if [ "$previous_state" = "stopped" ] && [ "$current_state" = "stopped" ]; then
	echo "${red}Server already stopped.${reset}"
    elif [ "$previous_state" = "running" ] && [ "$current_state" = "stopping" ]; then
	echo "${green}Server is stopping...${reset}"
    elif [ "$previous_state" = "pending" ] && [ "$current_state" = "stopping" ]; then
	echo "${green}Server is stopping...${reset}"
    elif [ "$previous_state" = "stopping" ] && [ "$current_state" = "stopping" ]; then
	echo "${red}Server is already stopping.${reset}"
    else
	echo "Previous state: $previous_state, current state: $current_state" 
    fi
}

usage () {
    echo "`basename $0` [status|start|stop|help]"
    echo "   * status: Show server status"
    echo "   * start: Start server"
    echo "   * stop: Stop server"
    echo "   * help: Show usage"
}

if [ "$1" = "status" ]; then status;
elif [ "$1" = "start" ]; then start;
elif [ "$1" = "stop" ]; then stop;
else usage;
fi