AWS EC2 : Automation bash script to launch/start/stop Ec2 Instance(Ubuntu Instances)

Hi Folks…

Being part of DevOps / Development teams we often face requirement to launch VM/EC2 instance to execute some script/ Jenkins pipeline(if Jenkins hosted on that instance) and after if task has been accomplished we need to shut down the instance to prevent occurring cost.

Here I am sharing a bash script to start/stop AWS EC2 instance. User/ Develop need to pass Instance Id as parameter. Here I used some bash scripting and AWS CLI commands to perform automated launch/stop EC2 instance.

You can clone the same script form github URL.

https://github.com/SaurabhG-20/AWS-Instance-start-stop-atuoamtion

Feel free to share the article/ or copy the block of code. Happy learning.

Steps :

1. Create file with extension .sh in folder where your Instance key have been stored.
2. Replace the File path in script with path of yours instance key file.
3. Keep your instance Id ready for the input.

At the end of script execution user will get command for launching EC2 instance.
P.S. This script is intended to launch Ubuntu OS based instance.

Script

#!/bin/bash
echo "   -------------------------------- "
echo "   Automation Script for instance start/stop"
echo "   -------------------------------- "
read -p "   Enter Instance Id : " instance_id
echo "   "
if [ -z "$instance_id" ]
then
echo "   Exiting from script. Please enter instance Id."
exit -1
else
echo "  --> Fetching Instance $instance_id status."
fi
instance_state=$(aws ec2 describe-instance-status --instance-id $instance_id --query 'InstanceStatuses[*].InstanceState.Name' --output text)
size=${#instance_state}
if [ -z "$instance_state" ]
then
echo "  --> Instance $instance_id is not in running state. Starting the instance"
# on first execution start-instances command returns "pending" state.
# we can run small while loop to check if instance started successfully or not
instance_start_invoke=$(aws ec2 start-instances --instance-ids $instance_id --query 'StartingInstances[*].CurrentState.Name' --output text)
echo "  --> start instance command execution result : $instance_start_invoke"
if [ "$instance_start_invoke" = "pending" ]
then
fetch_instance_start=$instance_start_invoke
while [ "$fetch_instance_start" = "pending" ]
do
fetch_instance_start=$(aws ec2 start-instances --instance-ids $instance_id --query 'StartingInstances[*].CurrentState.Name' --output text)
echo "  --> Instance state : $fetch_instance_start"
sleep 5
done
echo "  --> -------------------------------------------"
echo "  --> Instance state : $fetch_instance_start"
echo "  --> Checking Instance Health status"
fetch_instance_health="initializing"
while [ "$fetch_instance_health" = "initializing" ]
do
fetch_instance_health=$(aws ec2 describe-instance-status --instance-id $instance_id --query 'InstanceStatuses[*].InstanceStatus.Status' --output text)
echo "  --> Instance health check : $fetch_instance_health"
sleep 10
done
echo "  --> -------------------------------------------"
echo "  --> Instance health : $fetch_instance_health"
echo "Fetching Instance Ip"
instance_ip=$(aws ec2 describe-instances --instance-id $instance_id --query "Reservations[*].Instances[*].PublicIpAddress" --output=text)
echo "  --> Launching Instance $instance_id with instance's public IP $instance_ip"
file_path=<Paste file path of your instance key file>
echo "Launch Instance using command : ssh -i $file_path ubuntu@$instance_ip"
fi
else
if [ "$instance_state" = "running" ]
then
instnace_stop_invoke=$(aws ec2 stop-instances --instance-ids $instance_id --query 'StoppingInstances[*].CurrentState.Name' --output text)
echo "  --> Instance state : $instnace_stop_invoke"
echo "  --> Instance will be stopped after sometime."
fi
fi

#EC2 #Automation #AWS #Ubuntu