Stop and start a AWS EC2 instance from terminal

change_instance.sh

#! /bin/bash  

INSTANCEID="i-08b39a2442179285a"
INSTANCETYPE=$1

echo "instance id: $INSTANCEID"
echo "instance type: $INSTANCETYPE"

#2>&1 > /dev/null to suppress the cli output
# get instance details to check the current instance type
CURRENTINSTANCETYPE=$(aws ec2 describe-instances --instance-ids $INSTANCEID --query 'Reservations[*].Instances[*].InstanceType' --output text)
echo "current instance type: $CURRENTINSTANCETYPE"

# if the instance type is not the same as the new type, change it
if [ "$CURRENTINSTANCETYPE" != "$INSTANCETYPE" ]; then
    echo "stopping instance"
    aws ec2 stop-instances --instance-ids $INSTANCEID 2>&1 > /dev/null
    echo "waiting for instance to stop"
    aws ec2 wait instance-stopped --instance-ids $INSTANCEID

    # check if instance type has micro in it name 
    if [[ $CURRENTINSTANCETYPE == *"micro"* ]]; then
        # if it does, change the instance type to t2.micro
        echo "changing instance type to t2.large"
        aws ec2 modify-instance-attribute --instance-id $INSTANCEID --instance-type t3.large
    elif [[ $CURRENTINSTANCETYPE == *"large"* ]]; then
        echo "changing instance type to t2.micro"
        aws ec2 modify-instance-attribute --instance-id $INSTANCEID --instance-type t3.micro
    fi

    echo "starting instance"
    aws ec2 start-instances --instance-ids $INSTANCEID 2>&1 > /dev/null
    echo "waiting for instance to start"
    aws ec2 wait instance-running --instance-ids $INSTANCEID
else
    echo "instance type is already $INSTANCETYPE"
fi

# echo "changing instance type"
# aws ec2 modify-instance-attribute --instance-id $INSTANCEID --instance-type $2
echo "done"

stop_start_aws_instance.sh

echo "instance id: $1"

#2>&1 > /dev/null to suppress the cli output

echo "stopping instance"
aws ec2 stop-instances --instance-ids $1 2>&1 > /dev/null
echo "waiting for instance to stop"
aws ec2 wait instance-stopped --instance-ids $1

echo "starting instance"
aws ec2 start-instances --instance-ids $1 2>&1 > /dev/null
echo "waiting for instance to start"
aws ec2 wait instance-running --instance-ids $1
echo "done"

wget https://gist.githubusercontent.com/mehdi89/5f3fc412281c4e400a41c12a31867773/raw/4c2424ac9454195c39b66b4af280ba93ac4da621/change_instance.sh && sudo chmod +x change_instance.sh